SIST EN 16905-5:2023
(Main)Gas-fired endothermic engine driven heat pumps - Part 5: Calculation of seasonal performances in heating and cooling mode
Gas-fired endothermic engine driven heat pumps - Part 5: Calculation of seasonal performances in heating and cooling mode
This part of EN 16905 specifies the calculation of the seasonal performance factor for gas-fired endothermic engine driven heat pumps for heating and/or cooling mode including the engine heat recovery, to be used outdoors.
This document only applies to appliances with a maximum heat input (based on net calorific value) not exceeding 70 kW at standard rating conditions.
This document only applies to appliances under categories I2H, I2E, I2Er, I2R, I2E(S)B, I2L, I2LL, I2ELL, I2E(R)B, I2ESi, I2E(R), I3P, I3B, I3B/P, II2H3+, II2Er3+, II2H3B/P, II2L3B/P, II2E3B/P, II2ELL3B/P, II2L3P, II2H3P, II2E3P and II2Er3P according to EN 437:2021.
This document only applies to appliances having:
a) gas fired endothermic engines under the control of fully automatic control systems;
b) closed system refrigerant circuits in which the refrigerant does not come into direct contact with the fluid to be cooled or heated;
c) where the temperature of the heat transfer fluid of the heating system (heating water circuit) does not exceed 105 °C during normal operation;
d) where the maximum operating pressure in the:
1) heating water circuit (if installed) does not exceed 6 bar,
2) domestic hot water circuit (if installed) does not exceed 10 bar.
This document applies to GEHP appliances only when used for space heating or space cooling or for refrigeration, with or without heat recovery.
This document is applicable to GEHP appliances that are intended to be type tested. Requirements for GEHP appliances that are not type tested would need to be subject to further consideration.
Gasbefeuerte endothermische Motor-Wärmepumpen - Teil 5: Berechnung der saisonalen Effizienzkennzahlen im Heiz- und Kühlmodus
Dieser Teil von EN 16905 legt die Berechnung des saisonalen Leistungsfaktors von gasbefeuerten endothermischen Motor-Wärmepumpen, die für den Heiz- und/oder Kühlbetrieb vorgesehen sind, einschließlich der Außen-Motor-Wärmerückgewinnung, fest.
Dieses Dokument gilt ausschließlich für Geräte mit einer maximalen Wärmebelastung von 70 kW (bezogen auf den Heizwert [NCV; en: net calorific value]) bei Norm-Nennbedingungen.
Dieses Dokument gilt ausschließlich für Geräte der Kategorien I2H, I2E, I2Er, I2R, I2E(S)B, I2L, I2LL, I2ELL, I2E(R)B, I2ESi, I2E(R), I3P, I3B, I3B/P, II2H3+, II2Er3+, II2H3B/P, II2L3B/P, II2E3B/P, II2ELL3B/P, II2L3P, II2H3P, II2E3P und II2Er3P nach EN 437:2021.
Dieses Dokument gilt ausschließlich für Geräte mit:
a) endothermischen Gasmotoren, die durch vollständig automatisierte Regelungen gesteuert werden;
b) geschlossenen Kühlkreislaufsystemen, in denen das Kühlmittel nicht direkt mit der zu kühlenden oder zu erwärmenden Flüssigkeit in Berührung kommt;
c) einer Temperatur des Wärmeübertragungsmediums im Heizsystem (Heizungswasserkreislauf), die im Normalbetrieb 105 °C nicht überschreitet;
d) einem höchsten Betriebsdruck im:
1) Heizungswasserkreislauf (falls installiert), der 6 bar nicht überschreitet,
2) Warmwasserbereitungskreislauf für Nutzwasser (falls installiert), der 10 bar nicht überschreitet.
Dieses Dokument gilt ausschließlich für GEHP-Geräte, die zur Raumheizung oder -kühlung oder zur Kälteerzeugung mit oder ohne Wärmerückgewinnung angewendet werden.
Dieses Dokument ist anwendbar für GEHP-Geräte, die einer Typprüfung zu unterziehen sind. Anforderungen an nicht typgeprüfte GEHP-Geräte müssten einer näheren Betrachtung unterzogen werden.
Pompes à chaleur à moteur endothermique alimenté au gaz -Partie 5 : Calcul des performances saisonnières en modes chauffage et refroidissement
La présente partie de l'EN 16905 décrit le calcul du facteur de performance saisonnière des pompes à chaleur à moteur endothermique alimenté au gaz pour le mode chauffage et/ou refroidissement, y compris la récupération de chaleur du moteur, qui doivent être utilisées en extérieur.
Le présent document ne s'applique qu'aux appareils dont le débit calorifique maximal (dérivé du pouvoir calorifique inférieur) ne dépasse pas 70 kW dans les conditions de performance nominale.
Le présent document se limite également aux appareils classés dans les catégories I2H, I2E, I2Er, I2R, I2E(S)B, I2L, I2LL, I2ELL, I2E(R)B, I2ESi, I2E(R), I3P, I3B, I3B/P, II2H3+, II2Er3+, II2H3B/P, II2L3B/P, II2E3B/P, II2ELL3B/P, II2L3P, II2H3P, II2E3P et II2Er3P de l'EN 437:2021.
Le présent document ne s'applique qu'aux appareils :
a) équipés de moteurs endothermiques alimentés au gaz régulés par des systèmes de régulation entièrement automatisés ;
b) comportant des circuits fermés de réfrigérant dans lesquels le réfrigérant n'entre pas en contact direct avec le fluide à refroidir ou à chauffer ;
c) dans lesquels la température du fluide caloporteur du système de chauffage (circuit d'eau de chauffage) ne dépasse pas 105 °C dans les conditions normales de fonctionnement ;
d) dans lesquels la pression maximale de fonctionnement :
1) ne dépasse pas 6 bar dans le circuit d'eau de chauffage (le cas échéant) ; et
2) ne dépasse pas 10 bar dans le circuit d'eau chaude sanitaire (le cas échéant).
Le présent document s'applique aux appareils GEHP utilisés uniquement pour le chauffage de locaux, le refroidissement de locaux ou la réfrigération, avec ou sans récupération de chaleur.
Le présent document s'applique aux appareils GEHP destinés à être soumis à des essais de type. Les exigences relatives aux appareils GEHP non soumis à des essais de type pourraient être assujetties à des considérations supplémentaires.
Toplotna črpalka s plinsko gnanim motorjem z notranjim zgorevanjem - 5. del: Izračun sezonske zmogljivosti za ogrevanje in hlajenje
Ta del iz skupine standardov FprEN 16905 določa metode za izračun faktorja sezonske zmogljivosti za toplotne črpalke s plinsko gnanim motorjem z notranjim zgorevanjem za ogrevanje in/ali hlajenje, vključno z rekuperacijo toplote motorja.
General Information
Relations
Overview
EN 16905-5:2022 (CEN) specifies the method to calculate the seasonal performance of gas-fired endothermic engine driven heat pumps (GEHPs) in both heating and cooling modes, including engine heat recovery, for outdoor use. The standard applies to GEHPs with a maximum heat input (net calorific value) up to 70 kW and to appliances intended for type testing. It was approved in December 2022 and supersedes EN 16905-5:2017.
Key topics and requirements
- Scope limits
- Outdoor GEHP appliances only; maximum heat input ≤ 70 kW.
- Applicable appliance categories as defined in EN 437:2021 (gas categories listed in the standard).
- Appliances must have fully automatic control systems and closed refrigerant circuits (no direct refrigerant contact with the fluid to be heated/cooled).
- Heating water circuit temperature ≤ 105 °C during normal operation.
- Maximum operating pressures: heating water circuit ≤ 6 bar; domestic hot water circuit ≤ 10 bar.
- Calculation methodology
- Defines the seasonal performance factor computation for heating and cooling, taking into account part-load behavior and engine heat recovery.
- Includes general formulas and step-by-step calculation procedures for parameters such as GUE, AEF, EHRE, SGUE, SAEF, SAEHRF and the overall SPER.
- Covers part-load conditions for common configurations: air‑to‑air, air‑to‑water, water‑to‑water, brine systems, DX-to-water and multi-split arrangements.
- Documentation & examples
- Normative and informative annexes provide templates for technical documentation, calculation examples, and procedures to derive reference annual heating/cooling demands and operating hours.
- Compliance linkage
- Annexes map the standard to relevant EU regulations and Ecodesign requirements, assisting compliance and regulatory alignment.
Applications
- Type testing and performance certification of GEHP products.
- Determining seasonal efficiency and primary energy consumption for product declarations, tender specifications, and energy performance assessments.
- Supporting product development, selection and comparison of gas-fired heat pump systems for space heating, cooling or refrigeration (with/without heat recovery).
- Input for regulatory compliance, eco-design assessments and energy labelling processes.
Who should use this standard
- GEHP manufacturers and R&D teams
- Test laboratories and certification bodies performing type tests
- HVAC system designers and specifiers selecting gas-engine heat pumps
- Compliance engineers and energy consultants preparing technical documentation and regulatory filings
Related standards
- EN 16905 series (Parts 1–4: terms, safety, test conditions and methods)
- EN 437:2021 (gas appliance categories)
- Relevant EU Commission Regulations referenced in Annex ZA/ZB/ZC for Ecodesign and safety compliance
Keywords: EN 16905-5:2022, gas-fired endothermic engine driven heat pumps, seasonal performance factor, GEHP, engine heat recovery, calculation of seasonal performances, heating and cooling mode, CEN standard.
Frequently Asked Questions
SIST EN 16905-5:2023 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Gas-fired endothermic engine driven heat pumps - Part 5: Calculation of seasonal performances in heating and cooling mode". This standard covers: This part of EN 16905 specifies the calculation of the seasonal performance factor for gas-fired endothermic engine driven heat pumps for heating and/or cooling mode including the engine heat recovery, to be used outdoors. This document only applies to appliances with a maximum heat input (based on net calorific value) not exceeding 70 kW at standard rating conditions. This document only applies to appliances under categories I2H, I2E, I2Er, I2R, I2E(S)B, I2L, I2LL, I2ELL, I2E(R)B, I2ESi, I2E(R), I3P, I3B, I3B/P, II2H3+, II2Er3+, II2H3B/P, II2L3B/P, II2E3B/P, II2ELL3B/P, II2L3P, II2H3P, II2E3P and II2Er3P according to EN 437:2021. This document only applies to appliances having: a) gas fired endothermic engines under the control of fully automatic control systems; b) closed system refrigerant circuits in which the refrigerant does not come into direct contact with the fluid to be cooled or heated; c) where the temperature of the heat transfer fluid of the heating system (heating water circuit) does not exceed 105 °C during normal operation; d) where the maximum operating pressure in the: 1) heating water circuit (if installed) does not exceed 6 bar, 2) domestic hot water circuit (if installed) does not exceed 10 bar. This document applies to GEHP appliances only when used for space heating or space cooling or for refrigeration, with or without heat recovery. This document is applicable to GEHP appliances that are intended to be type tested. Requirements for GEHP appliances that are not type tested would need to be subject to further consideration.
This part of EN 16905 specifies the calculation of the seasonal performance factor for gas-fired endothermic engine driven heat pumps for heating and/or cooling mode including the engine heat recovery, to be used outdoors. This document only applies to appliances with a maximum heat input (based on net calorific value) not exceeding 70 kW at standard rating conditions. This document only applies to appliances under categories I2H, I2E, I2Er, I2R, I2E(S)B, I2L, I2LL, I2ELL, I2E(R)B, I2ESi, I2E(R), I3P, I3B, I3B/P, II2H3+, II2Er3+, II2H3B/P, II2L3B/P, II2E3B/P, II2ELL3B/P, II2L3P, II2H3P, II2E3P and II2Er3P according to EN 437:2021. This document only applies to appliances having: a) gas fired endothermic engines under the control of fully automatic control systems; b) closed system refrigerant circuits in which the refrigerant does not come into direct contact with the fluid to be cooled or heated; c) where the temperature of the heat transfer fluid of the heating system (heating water circuit) does not exceed 105 °C during normal operation; d) where the maximum operating pressure in the: 1) heating water circuit (if installed) does not exceed 6 bar, 2) domestic hot water circuit (if installed) does not exceed 10 bar. This document applies to GEHP appliances only when used for space heating or space cooling or for refrigeration, with or without heat recovery. This document is applicable to GEHP appliances that are intended to be type tested. Requirements for GEHP appliances that are not type tested would need to be subject to further consideration.
SIST EN 16905-5:2023 is classified under the following ICS (International Classification for Standards) categories: 27.080 - Heat pumps. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 16905-5:2023 has the following relationships with other standards: It is inter standard links to SIST EN 16905-5:2018. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 16905-5:2023 is associated with the following European legislation: EU Directives/Regulations: 2009/125/EC, 2016/2281, 811/2013, 813/2013; Standardization Mandates: M/535, M/560. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
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Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2023
Nadomešča:
SIST EN 16905-5:2018
Toplotna črpalka s plinsko gnanim motorjem z notranjim zgorevanjem - 5. del:
Izračun sezonske zmogljivosti za ogrevanje in hlajenje
Gas-fired endothermic engine driven heat pumps - Part 5: Calculation of seasonal
performances in heating and cooling mode
Gasbefeuerte endothermische Motor-Wärmepumpen - Teil 5: Berechnung der
saisonalen Effizienzkennzahlen im Heiz- und Kühlmodus
Pompes à chaleur à moteur endothermique alimenté au gaz -Partie 5 : Calcul des
performances saisonnières en modes chauffage et refroidissement
Ta slovenski standard je istoveten z: EN 16905-5:2022
ICS:
27.080 Toplotne črpalke Heat pumps
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 16905-5
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2022
EUROPÄISCHE NORM
ICS 27.080 Supersedes EN 16905-5:2017
English Version
Gas-fired endothermic engine driven heat pumps - Part 5:
Calculation of seasonal performances in heating and
cooling mode
Pompes à chaleur à moteur endothermique alimenté Gasbefeuerte endothermische Motor-Wärmepumpen -
au gaz -Partie 5 : Calcul des performances saisonnières Teil 5: Berechnung der saisonalen Effizienzkennzahlen
en modes chauffage et refroidissement im Heiz- und Kühlmodus
This European Standard was approved by CEN on 28 November 2022.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16905-5:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Part load conditions for space cooling . 7
4.1 General . 7
4.2 Air-to-air units . 7
4.3 Water-to-air and brine-to-air units . 8
4.4 Air-to-water and air-to-brine units . 8
4.5 Water-to-water and brine-to-water units . 9
5 Part load conditions for space heating . 11
5.1 General . 11
5.2 Air-to-air units . 11
5.3 Water(brine)-to-air units . 12
5.4 Air-to-water(brine) units . 12
5.4.1 General . 13
5.4.2 Low temperature application . 13
5.4.3 Intermediate temperature application . 14
5.4.4 Medium temperature application . 15
5.5 DX-to-water(brine), water-to-water(brine), brine-to-water(brine) units . 15
5.5.1 General . 15
5.5.2 Low temperature application . 16
5.5.3 Intermediate temperature application . 17
5.5.4 Medium temperature application . 18
6 Calculation methods for reference SPER . 19
c
6.1 General . 19
6.2 General formula for calculation of GUE and AEF . 19
c c
6.3 General formula for calculation of EHRE and AEHRF . 19
c c
6.4 General formula for calculation of reference SGUE . 19
c
6.5 Calculation of reference SEHRE . 20
c
6.6 Calculation of reference SGUE . 21
Tc
6.7 Calculation of reference SAEF . 21
c
6.8 Calculation of reference annual cooling demand (Q ) . 21
ref,c
6.9 Calculation of reference SAEF . 22
cON
6.10 Calculation of reference SAEHRF . 22
c
6.11 Calculation of reference total SAEF . 23
Tc
6.12 Procedures for the determination of GUE / AEF values . 23
cPL cPL
6.13 Procedures for the determination of EHRE / AEHRF values . 23
cPL cPL
6.14 Calculation of reference SPER . 23
c
6.15 Calculation of the annual primary energy consumption cooling Q . 24
CP
6.16 Calculation of the seasonal space cooling efficiency η . 24
s,c
7 Calculation methods for reference SPER . 24
h
7.1 General . 24
7.2 General formula for calculation of GUE and AEF . 25
h h
7.3 General formula for calculation of EHRE . 25
h
7.4 General formula for calculation of reference SGUE . 25
h
7.5 Calculation of reference SEHRE . 28
h
7.6 Calculation of reference SGUE . 28
Th
7.7 Calculation of reference SAEF . 28
h
7.8 Calculation of reference annual heating demand (Q ) . 29
ref,h
7.9 Calculation of reference SAEF . 29
hON
7.10 Calculation of reference SAEHRFh . 30
7.11 Calculation of reference total SAEF . 30
Th
7.12 Procedures for the determination of GUE / AEF values . 30
hPL hPL
7.13 Procedures for the determination of EHRE / AEHRF values . 30
hPL hPL
7.14 Calculation of reference SPER . 31
h
7.15 Calculation of the annual primary energy consumption heating Q . 31
HP
7.16 Calculation of the seasonal space heating efficiency η . 31
s,h
8 Technical documentation . 32
Annex A (normative) Determination of reference annual cooling/heating demands and
determination of hours for active mode, thermostat off, standby, off mode and
crankcase heater mode for reference SAEFc and SAEFh calculation . 33
Annex B (informative) Calculation example for reference SGUE , SAEF , SEHRE , SAEHRF ,
c c c c
SGUE , SAEF and SPER . 35
Tc Tc c
Annex C (informative) Calculation example for reference SGUE , SAEF , SEHRE , SAEHRF ,
h h h h
SGUE , SAEF and SPER . 38
Tc Th h
Annex D (informative) Template for technical documentation . 41
Annex E (normative) Rating of outdoor units of multi-split air conditioners and heat pumps . 46
Annex ZA (informative) Relationship between this European Standard and the
requirements of Commission Regulation (EU) No 813/2013 aimed to be covered . 49
Annex ZB (informative) Relationship between this European Standard and the
requirements of Commission Regulation (EU) No 2016/2281 aimed to be covered . 50
Annex ZC (informative) Relationship between this European Standard and the requirements
of Commission Regulation (EU) No 811/2013 aimed to be covered . 51
Bibliography . 52
European foreword
This document (EN 16905-5:2022) has been prepared by Technical Committee CEN/TC 299 “Gas-fired
sorption appliances, indirect fired sorption appliances, gas-fired endothermic engine heat pumps and
domestic gas-fired washing and drying appliances”, the secretariat of which is held by UNI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by June 2023, and conflicting national standards shall be
withdrawn at the latest by June 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 16905-5:2017.
EN 16905-5:2017:
— technical changes throughout the draft and in Annex ZA, Annex ZB and Annex ZC in order to align
the text with the Ecodesign Requirements stated in Commission Regulation (EU) No 2016/426.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, Annex ZB and
Annex ZC, which are integral parts of this document.
EN 16905 comprises the following parts under the general title Gas‐fired endothermic engine driven heat
pumps:
— Part 1: Terms and definitions;
— Part 2: Safety;
— Part 3: Tests conditions;
— Part 4: Tests methods;
— Part 5: Calculation of seasonal performances in heating and cooling mode.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Introduction
This document specifies the calculation of seasonal performances in heating and cooling mode of air
conditioners and heat pumps using either air, water or brine as heat transfer media, with gas-fired
endothermic engine driven compressors when used for space heating, cooling and refrigeration,
hereafter referred to as “GEHP appliance”.
Single split and multisplit systems are covered by this document.
The GEHP appliances can have one or more primary or secondary functions.
The GEHP appliances having their condenser cooled by air and by the evaporation of external additional
water are not covered by this document.
(EU) 2016/426 relating to appliances burning gaseous fuels and repealing Directive 2009/142/EC (see
1 2 1
EN 16905-4:— , Annex ZA). EN 16905-1:2017, EN 16905-2:— , EN 16905-3:2017, EN 16905-4:— and
conditions, tests methods and seasonal performances calculation methods under Mandate M/535; (see
EN 16905-3:2017, Annex ZA, EN 16905-4:— , Annex ZA, EN 16905-5:2022, Annex ZA and
EN 16905-2:— , Annexes ZB and ZC).
These documents will be reviewed whenever new mandates could apply.
Under preparation. Stage at the time of publication: prEN 16905-4:2022.
Under preparation. Stage at the time of publication: prEN 16905-2:2021.
1 Scope
This part of EN 16905 specifies the calculation of the seasonal performance factor for gas-fired
endothermic engine driven heat pumps for heating and/or cooling mode including the engine heat
recovery, to be used outdoors.
This document only applies to appliances with a maximum heat input (based on net calorific value) not
exceeding 70 kW at standard rating conditions.
This document only applies to appliances under categories I , I , I , I , I , I , I , I , I , I ,
2H 2E 2Er 2R 2E(S)B 2L 2LL 2ELL 2E(R)B 2ESi
I , I , I , I , II , II , II , II , II , II , II , II , II and II according to
2E(R) 3P 3B 3B/P 2H3+ 2Er3+ 2H3B/P 2L3B/P 2E3B/P 2ELL3B/P 2L3P 2H3P 2E3P 2Er3P
EN 437:2021.
This document only applies to appliances having:
a) gas fired endothermic engines under the control of fully automatic control systems;
b) closed system refrigerant circuits in which the refrigerant does not come into direct contact with
the fluid to be cooled or heated;
c) where the temperature of the heat transfer fluid of the heating system (heating water circuit) does
not exceed 105 °C during normal operation;
d) where the maximum operating pressure in the:
1) heating water circuit (if installed) does not exceed 6 bar,
2) domestic hot water circuit (if installed) does not exceed 10 bar.
This document applies to GEHP appliances only when used for space heating or space cooling or for
refrigeration, with or without heat recovery.
This document is applicable to GEHP appliances that are intended to be type tested. Requirements for
GEHP appliances that are not type tested would need to be subject to further consideration.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 16905-1:2017, Gas‐fired endothermic engine driven heat pumps — Part 1: Terms and definitions
EN 16905-4:— , Gas‐fired endothermic engine driven heat pumps — Part 4: Test methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 16905-1:2017 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
• ISO Online browsing platform: available at https://www.iso.org/obp
• IEC Electropedia: available at https://www.electropedia.org/
4 Part load conditions for space cooling
4.1 General
For the purpose of calculation of application SGUE , SAEF , SEHRE , SAEHRF , SGUE , SAEF and
c c c c Tc Tc
reference SGUE , SAEF , SEHRE , SAEHRF , SGUE , SAEF as explained in Clauses 6 and 7, the part load
c c c c Tc Tc
ratios mentioned below shall be based on the part load ratio formulas with at least two decimal digits.
For the purpose of SGUE , SAEF , SEHRE , SAEHRF , SGUE , SAEF the different conditions are defined
c c c c Tc Tc
by a reference design temperature Tdesignc equal to 35 °C.
The calculation of SGUE , SAEF , SEHRE , SAEHRF , SGUE , SAEF and reference SGUE , SAEF , SEHRE ,
c c c c Tc Tc c c c
SAEHRF , SGUE , SAEF is determined via linear interpolation of the respective part load values at the
c Tc Tc
reference part load conditions mentioned below (A, B, C, D).
4.2 Air-to-air units
For outdoor air-to-recycled air units, the part load conditions for determining the declared capacity
(DC) and the declared GUE , AEF , EHRE ,, AEHRF , GUE , AEF are given in Table 1.
c c c c Tc Tc
Table 1 — Part load conditions for outdoor air-to- recycled air units
Outdoor heat Indoor heat
exchanger exchanger
Part load
Formula
ratio
Air dry bulb Air dry (wet) bulb
temperature temperatures
% °C °C
A (35–16)/(T -16) 100,00 35 27(19)
designc
B (30–16)/(T -16) 73,68 30 27(19)
designc
C (25–16)/(T -16) 47,37 25 27(19)
designc
D (20–16)/(T -16) 21,05 20 27(19)
designc
4.3 Water-to-air and brine-to-air units
For water-to-air and brine-to-air units, the part load conditions for determining the declared capacity
(DC) and the declared GUE , AEF , EHRE ,, AEHRF , GUE , AEF are given in Table 2.
c c c c Tc Tc
Table 2 — Part load conditions for water-to-air and brine-to-air units
Indoor heat
Outdoor heat exchanger
exchanger
Cooling tower
or Ground
Part
Dry cooler
water(brine) coupled
Formula load
application Air dry (wet)
loop application
ratio
Inlet/outlet bulb
application Inlet/outlet
water temperature
Inlet/outlet water(brine)
temperatures
water(brine) temperatures
temperatures
% °C °C °C °C
A (35–16)/(T -16) 100,00 30/35 10/15 50/55 27(19)
designc
a a a
B (30–16)/(T -16) 73,68 26/ 10/ 45/ 27(19)
designc
a a a
C (25–16)/(T -16) 47,37 22/ 10/ 40/ 27(19)
designc
a a a
D (20–16)/(T -16) 21,05 18/ 10/ 35/ 27(19)
designc
If a cooling tower and a water-to-air unit are sold as a matched assembly, they shall be tested as an air-
to-air unit.
a
With the flow rate as determined during “A” test for units with a fixed flow rate or a fixed water temperature
difference of 5 °K for units with a variable flow rate. If for any of the test conditions the resulting flow rate is below
the minimum flow rate then this minimum flow rate is used as a fixed flow rate with the inlet temperature for this
test condition.
4.4 Air-to-water and air-to-brine units
For each application, units either allowing or not allowing a variation of the outlet water/brine
temperature with the outdoor temperature are considered. The part load conditions for determining
the declared capacity (DC) and the declared GUE , AEF , EHRE , AEHRF , GUE , AEF are given in
c c c c Tc Tc
Table 3.
The variable outlet temperature (T ) shall only be applied when the control provides a
outlet,average
regulation of outlet water temperature that considers the outdoor temperature.
For the determination of water (brine) temperature for fixed capacity units with variable outlet
temperature refer to EN 16905-4:— .
For units with variable outlet that have to cycle on/off to reach the required part load ratio, the inlet
and outlet temperatures of the indoor heat exchanger shall be determined according to EN 16905-4:— ,
Annex H.
Table 3 — Part load conditions of air-to-water and air-to-brine units
Outdoor heat
Indoor heat exchanger
exchanger
Part Outdoor air Fan coil application
Cooling floor
Formula load dry bulb Inlet/outlet water(brine)
application
ratio temperature temperatures
Inlet/outlet
water(brine)
Fixed Variable
temperatures
b
outlet outlet
% °C °C °C °C
A (35–16)/(T -16) 100,00 35 12/7 12/7 23/18
designc
a a a
B (30–16)/(T -16) 73,68 30 /7 /8,5 /18
designc
a a
/7 /10 a
C (25–16)/(T -16) 47,37 25 /18
designc
a a a
D (20–16)/(T -16) 21,05 20 /7 /11,5 /18
designc
a
With the flow rate as determined during “A” test for units with a fixed flow rate or with a fixed water
temperature difference 5 K for units with a variable flow rate. If for any of the test conditions the resulting flow
rate is below the minimum flow rate then this minimum flow rate is used as a fixed flow rate with the outlet
temperature for this test condition.
b
If the variable outlet temperature is above the maximum of the operating range of the unit, this maximum
should be considered.
4.5 Water-to-water and brine-to-water units
For each application, units either allowing or not allowing a variation of the outlet water/brine
temperature with the outdoor temperature are considered. The part load conditions for determining
the declared capacity (DC) and the declared GUE , AEF , EHRE , AEHRF , GUE , AEF are given in
c c c c Tc Tc
Table 4.
The variable outlet temperature (T ) shall only be applied when the control provides a
outlet,average
regulation of outlet water temperature that considers the outdoor temperature.
For the determination of water (brine) temperature for fixed capacity units with variable outlet
temperature refer to EN 16905-4:— .
For units with variable outlet that have to cycle on/off to reach the required part load ratio, the inlet
and outlet temperatures of the indoor heat exchanger shall be determined according to EN 16905-4:— ,
Annex H.
Table 4 — Part load conditions of water-to-water, water-to-brine, brine-to-water, brine-to-brine and DX-to-water units
Outdoor heat exchanger Indoor heat exchanger
Cooling tower or Fan coil application
Ground coupled Dry cooler
water(brine) loop Inlet/outlet water Cooling floor
DX
application application
application temperatures application
Inlet/outlet Inlet/outlet
Bath
Inlet/outlet Inlet/outlet water
water(brine) water(brine)
temperature
Variable
water(brine) temperatures
Fixed outlet
temperatures temperatures
b
outlet
temperatures
% °C °C °C °C °C °C
(35–16) /
A 100,00 30/35 10/15 50/55 30 12/7 12/7 23/18
(Tdesignc-16)
(30–16) /
a a a a a a
B 73,68 26/ 10/ 45/ 30 /7 /8,5 /18
(Tdesignc-16)
(25–16) /
a a a a a a
C 47,37 22/ 10/ 40/ 30 /7 /10 /18
(T -16)
designc
(20–16) /
a a a a a a
D 21,05 18/ 10/ 35/ 30 /7 /11,5 /18
(T -16)
designc
If a cooling tower and water-to-water unit are sold as a matched assembly, they shall be tested as an air-to-water unit.
a
With the flow rate as determined during “A” test for units with a fixed flow rate or with a fixed water temperature difference of 5 K for units with a variable
flow rate. If for any of the test conditions the resulting flow rate is below the minimum flow rate then this minimum flow rate is used as a fixed flow rate with the
outlet temperature for this test condition.
b
If the variable outlet temperature is above the maximum of the operating range of the unit, this maximum should be considered.
Formula
Part load ratio
5 Part load conditions for space heating
5.1 General
For the purpose of calculation of SGUE , SAEF , SEHRE , SAEHRF SGUE , SAEF , and reference SGUE ,
h h h h Th Th h
SAEF , SEHRE , SAEHRF SGUE , SAEF , as explained in Clauses 6 and 7, the part load ratios mentioned
h h h Th Th
below shall be based on the part load ratio formulas with at least two decimal digits.
The calculation of SGUE , SAEF , SEHRE , SAEHRF SGUE , SAEF and reference SGUE , SAEF , SEHRE ,
h h h h Th Th h h h
SAEHRF SGUE , SAEF is determined via linear interpolation of the respective part load values at the
h Th Th
reference part load conditions mentioned below (A, B, C, D). For the purpose of reference SGUE , SAEF ,
h h
SEHRE , SAEHRF SGUE , SAEF there are three reference conditions: average(A), warmer (W) and
h h Th Th
colder (C).
The relevant T values are defined as follows:
designh
— Average dry bulb temperature conditions at − 10 °C outdoor temperature and 20 °C
climate indoor temperature;
— Colder climate dry bulb temperature conditions at − 22 °C outdoor temperature and 20 °C
indoor temperature
— Warmer dry bulb temperature conditions at + 2 °C outdoor temperature and 20 °C
climate indoor temperature
For outdoor air dry bulb temperatures higher or equal to −10 °C the wet bulb temperature equals the
dry bulb temperature minus 1 K. For dry bulb temperatures below −10 °C, the wet bulb temperature is
not defined.
For heat pumps, the relevant T is defined as follows:
biv
— for the average heating season, the dry bulb temperature is +2 °C or lower;
— for the colder heating season, the dry bulb temperature is −7 °C or lower;
— for the warmer heating season, the dry bulb temperature is +7 °C or lower.
For heat pumps, the relevant TOL is defined as follows:
— for the average heating season, the dry bulb temperature is −7 °C or lower;
— for the colder heating season, the dry bulb temperature is −15 °C or lower;
— for the warmer heating season, the dry bulb temperature is +2 °C or lower.
If the declared TOL is lower than the T of the considered climate, then the outdoor dry bulb
designh
temperature is equal to T for the part load condition E in Table 5, Tables 7 to 10.
designh
In case of colder climate and if TOL is below −20 °C, an additional part load condition G at −15 °C shall
apply for air-to-air and air-to-water heat pumps.
5.2 Air-to-air units
The part load conditions for determining the reference SGUE (Formula (16)), SAEF (Formula (20)),
h h
SEHRE (Formula (18)), SAEHRF (Formula (23)) SGUE (Formula (19)), SAEF (Formula (24)), are
h h Th Th
given in Table 5.
Table 5 — Part load conditions for air-to-recycled air units for the reference heating seasons
Part load ratio
Outdoor heat Indoor heat
exchanger exchanger
in %
Air dry (wet)
Air dry bulb
Formula Average Warmer Colder bulb
temperature
temperature
°C °C
A (−7–16)/(T -16) 88,46 n/a 60,53 −7(−8) 20
designh
B (+2–16)/(T -16) 53,85 100,00 36,84 2(1) 20
designh
C (+7–16)/(T -16) 34,62 64,29 23,68 7(6) 20
designh
D (+12–16)/(T -16) 15,38 28,57 10,53 12(11) 20
designh
E (TOL-16)/(T -16) TOL 20
designh
F (T -16)/(T −16) T 20
biv designh biv
G (−15 - 16) / (T −16) n/a n/a 81,58 −15 20
designh
5.3 Water(brine)-to-air units
The part load conditions for determining the reference SGUE (Formula (16)), SAEF (Formula (20)),
h h
SEHRE (Formula (18)), SAEHRF (Formula (23)) SGUE (Formula (19)), SAEF (Formula (24)), are
h h Th Th
given in Table 6.
Table 6 — Part load conditions for water(brine)-to-air for the reference heating seasons
Part load ratio Outdoor heat
exchanger
Indoor heat
in %
exchanger
inlet/outlet
temperature
Formula Average Warmer Colder
Water
Water Brine Dry bulb
loop
°C °C °C °C
a a a
A (−7–16)/(T -16) 88,46 n/a 60,53 10/ 0/ 20/ 20
designh
a a a
B (+2–16)/(T -16) 53,85 100,00 36,84 10/ 0/ 20/ 20
designh
a a a
C (+7–16)/(T -16) 34,62 64,29 23,68 10/ 0/ 20/ 20
designh
a a a
D (+12–16)/(Tdesignh-16) 15,38 28,57 10,53 10/ 0/ 20/ 20
(T - 16)/(T
designh designh
a a a
E 100,00 100,00 100,00 10/ 0/ 20/ 20
−16)
a a a
F (Tbiv-16)/(Tdesignh-16) 10/ 0/ 20/ 20
a
With the flow rate as determined at the standard rating conditions for units with a fixed flow rate or with a
fixed water temperature difference of 3 K for units with a variable flow rate. If for any of the test conditions the
resulting flow rate is below the minimum flow rate then this minimum flow rate is used as a fixed flow rate with
the inlet temperature for this test condition.
Condition Condition
5.4 Air-to-water(brine) units
5.4.1 General
The part load conditions for determining the reference SGUE (Formula (16)), SAEF (Formula (20)),
h h
SEHRE (Formula (18)), SAEHRF (Formula (23)) SGUE (Formula (19)), SAEF (Formula (24)), are
h h Th Th
given in Table 7, Table 8 and Table 9.
The variable outlet temperature (T ) shall only be applied when the control provides an
outlet, average
outdoor air temperature dependant modification of the outlet temperature.
For the determination of water (brine) temperature for fixed capacity units with variable outlet
temperature refer to EN 16905-4:— .
For units with variable outlet that have to cycle on/off to reach the required part load ratio the inlet and
outlet temperatures of the indoor heat exchanger shall be determined according to EN 16905-4:— .
5.4.2 Low temperature application
Table 7 — Part load conditions for air-to-water(brine) units in low temperature application for
the reference heating seasons
Outdoor heat
Indoor heat exchanger
exchanger
Part load ratio
in %
Dry (wet) bulb Fixed
d
Variable outlet
temperature outlet
°C °C °C
All
Formula Average Warmer Colder Outdoor air Average Warmer Colder
climates
(−7–16)/
a a a
A 88,46 n/a 60,53 −7(−8) /35 /34 n/a /30
(T -16)
designh
(+2–16)/
a a a a
B 53,85 100,00 36,84 2(1) /35 /30 /35 /27
(Tdesignh-16)
(+7–16)/
a a a a
C 34,62 64,29 23,68 7(6) /35 /27 /31 /25
(Tdesignh-16)
(+12–16)/
a a a a
D 15,38 28,57 10,53 12(11) /35 /24 /26 /24
(Tdesignh-16)
a a b a b a b
E (TOL-16)/(T -16) TOL /35 / / /
designh
a a c a c a c
F (T -16)/(T -16) T /35 / / /
bivalent designh biv
(−15 - 16)/
a a
G n/a n/a 81,58 −15 /35 n/a n/a /32
(T −16)
designh
a
With the flow rate as determined at the standard rating conditions at 30/35 conditions for units with fixed
flow rate, and with a fixed water temperature difference of 5 K for units with a variable flow rate. If for any of the
test conditions the resulting flow rate is below the minimum flow rate then this minimum flow rate is used as a
fixed flow rate with the outlet temperature for this test condition.
b
Variable outlet shall be calculated by interpolation from T and the temperature which is closest to the
designh
TOL.
c
Variable outlet shall be calculated by interpolation between the upper and lower temperatures which are
closest to the bivalent temperature.
d
If the variable outlet temperature is below the minimum of the operation range of the unit, this minimum
should be considered.
Condition
5.4.3 Intermediate temperature application
Table 8 — Part load conditions for air-to-water(brine) units in intermediate temperature
application for the reference heating seasons
Outdoor heat
Indoor heat exchanger
exchanger
Part load ratio
in %
Dry (wet) bulb Fixed
d
Variable outlet
temperature outlet
°C °C °C
All
Formula Average Warmer Colder Outdoor air Average Warmer Colder
climates
(−7–16)/
a a a
A 88,46 n/a 60,53 −7(−8) /45 /43 n/a /38
(Tdesignh-16)
(+2–16)/
a a a a
B 53,85 100,00 36,84 2(1) /45 /37 /45 /33
(Tdesignh-16)
(+7–16)/
a a a a
C 34,62 64,29 23,68 7(6) /45 /33 /39 /30
(Tdesignh-16)
(+12–16)/
a a a a
D 15,38 28,57 10,53 12(11) /45 /28 /31 /26
(Tdesignh-16)
a a b a b a b
E (TOL-16)/(Tdesignh-16) TOL /45 / / /
a a c a c a c
F (T -16)/(T -16) T /45 / / /
bivalent designh biv
(−15 - 16) /
a a
G n/a n/a 81,58 −15 /45 n/a n/a /41
(T −16)
designh
a
With the flow rate as determined at the standard rating conditions at 30/35 conditions for units with fixed
flow rate, and with a fixed water temperature difference of 5 K for units with a variable flow rate. If for any of the
test conditions the resulting flow rate is below the minimum flow rate then this minimum flow rate is used as a
fixed flow rate with the outlet temperature for this test condition.
b
Variable outlet shall be calculated by interpolation from T and the temperature which is closest to the
designh
TOL.
c
Variable outlet shall be calculated by interpolation between the upper and lower temperatures which are
closest to the bivalent temperature.
d
If the variable outlet temperature is below the minimum of the operation range of the unit, this minimum
should be considered.
Condition
5.4.4 Medium temperature application
Table 9 — Part load conditions for air-to-water(brine) units in medium temperature application
for the reference heating seasons
Outdoor heat
Indoor heat exchanger
exchanger
Part load ratio
in %
Dry (wet) bulb Fixed
d
Variable outlet
temperature outlet
°C °C °C
All
Formula Average Warmer Colder Outdoor air Average Warmer Colder
climates
(−7–16)/
a a a
A 88,46 n/a 60,53 −7(−8) /55 /52 n/a /44
(Tdesignh-16)
(+2–16)/
a a a a
B 53,85 100,00 36,84 2(1) /55 /42 /55 /37
(Tdesignh-16)
(+7–16)/
a a a a
C 34,62 64,29 23,68 7(6) /55 /36 /46 /32
(Tdesignh-16)
(+12–16)/
a a a a
D 15,38 28,57 10,53 12(11) /55 /30 /34 /28
(Tdesignh-16)
a a b a b a b
E (TOL-16)/(T -16) TOL /55 / / /
designh
a a c a c a c
F (T -16)/(T -16) T /55 / / /
bivalent designh biv
(−15 - 16) /
a a
G n/a n/a 81,58 −15 /55 n/a n/a /49
(T −16)
designh
a
With the flow rate as determined at the standard rating conditions at 30/35 conditions for units with fixed
flow rate, and with a fixed water temperature difference of 5 K for units with a variable flow rate. If for any of the
test conditions the resulting flow rate is below the minimum flow rate then this minimum flow rate is used as a
fixed flow rate with the outlet temperature for this test condition.
b
Variable outlet shall be calculated by interpolation from T and the temperature which is closest to the
designh
TOL.
c
Variable outlet shall be calculated by interpolation between the upper and lower temperatures which are
closest to the bivalent temperature.
d
If the variable outlet temperature is below the minimum of the operation range of the unit, this minimum
should be considered.
5.5 DX-to-water(brine), water-to-water(brine), brine-to-water(brine) units
5.5.1 General
The part load conditions for determining the reference SGUE (Formula (16)), SAEF (Formula (20)),
h h
SEHRE (Formula (18)), SAEHRF (Formula (23)) SGUE (Formula (19)), SAEF (Formula (24)), are
h h Th Th
given in Table 10, Table 11 and Table 12.
The variable outlet temperature (T ) shall only be applied when the control provides an
outlet, average
outdoor air temperature dependant modification of the outlet temperature.
For the determination of water (brine) temperature for fixed capacity units with variable outlet
temperature refer to EN 16905-4:— .
Condition
For units with variable outlet that have to cycle on/off to reach the required part load ratio the inlet and
outlet temperatures of the indoor heat exchanger shall be determined according to EN 16905-4:— .
5.5.2 Low temperature application
Table 10 — Part load conditions for DX-to-water(brine) and water(brine)-to-water(brine) units
in low temperature application for the reference heating seasons
Outdoor heat
Indoor heat exchanger
exchanger
Part load ratio
Bath
in %
Inlet/outlet Fixed
d
tempe- Variable outlet
temperature outlet
rature
°C °C °C °C
All
Formula Average Warmer Colder Water Brine DX Average Warmer Colder
climates
(−7–16)/
b b a a a
A 88,46 n/a 60,53 10 / 0 / 4 /35 /34 n/a /30
(T -
designh
16)
(+2–16)/
b b a a a a
B 53,85 100,00 36,84 10 / 0 / 4 /35 /30 /35 /27
(Tdesignh-
16)
(+7–16)/
b b a a a a
C 34,62 64,29 23,68 10 / 0 / 4 /35 /27 /31 /25
(Tdesignh-
16)
(+12–
16)/
b b a a a a
D 15,38 28,57 10,53 10 / 0 / 4 /35 /24 /26 /24
(T -
designh
16)
b b a a a a
E 100,0 10 / 0 / 4 /35 /35 /35 /35
b b a a c a c a c
F (T -16)/(T -16) 10 / 0 / 4 /35 / / /
bivalent designh
a
With the flow rate as determined at the standard rating conditions at 30/35 conditions for units with fixed
flow rate, and with a fixed water temperature difference of 5 K for units with a variable flow rate. If for any of the
test conditions the resulting flow rate is below the minimum flow rate then this minimum flow rate is used as a
fixed flow rate with the outlet temperature for this test condition.
b
With the flow rate as determined at the standard rating conditions for units with a fixed flow rate or with a
fixed water temperature difference 3 K for units with a variable flow rate. If for any of the test conditions the
resulting flow rate is below the minimum flow rate then this minimum flow rate is used as a fixed flow rate with
the inlet temperature for this test condition.
c
Variable outlet shall be calculated by interpolation between the upper and lower temperatures which are
closest to the bivalent temperature.
d
If the variable outlet temperature is below the minimum of the operation range of the unit, this minimum
should be considered.
Condition
5.5.3 Intermediate temperature application
Table 11 — Part load conditions for DX-to-water(brine) and water(brine)-to-water(brine)-units
in intermediate temperature application for the reference heating seasons
Outdoor heat
Indoor heat exchanger
exchanger
Part load ratio
Bath
in %
Inlet/outlet Fixed
d
tempe- Variable outlet
temperature outlet
rature
°C °C °C °C
All
Formula Average Warmer Colder Water Brine DX Average Warmer Colder
climates
(−7–16)/
b b a a a
A 88,46 n/a 60,53 10 / 0 / 4 /45 /43 n/a /38
(Tdesignh-
16)
(+2–16)/
b b a a a a
B 53,85 100,00 36,84 10 / 0 / 4 /45 /37 /45 /33
(T -
designh
16)
(+7–16)/
b b a a a a
C 34,62 64,29 23,68 10 / 0 / 4 /45 /33 /39 /30
(Tdesignh-
16)
(+12–
16)/
b b a a a a
D 15,38 28,57 10,53 10 / 0 / 4 /45 /28 /31 /26
(T -
designh
16)
b b a a a a
E 100,0 10 / 0 / 4 /45 /45 /45 /45
b b a a c a c a c
F (Tbivalent-16)/(Tdesignh-16) 10 / 0 / 4 /45 / / /
a
With the flow rate as determined at the standard rating conditions at 30/35 conditions for units with fixed
flow rate, and with a fixed water temperature difference of 5 K for units with a variable flow rate. If for any of the
test conditions the resulting flow rate is below the minimum flow rate then this minimum flow rate is used as a
fixed flow rate with the outlet temperature for this test condition.
b
With the flow rate as determined at the standard rating conditions for units with a fixed flow rate or with a
fixed water temperature difference 3 K for units with a variable flow rate. If for any of the test conditions the
resulting flow rate is below the minimum flow rate then this minimum flow rate is used as a fixed flow rate with
the inlet temperature for this test condition.
c
Variable outlet shall be calculated by interpolation between the upper and lower temperatures which are
closest to the bivalent temperature.
d
If the variable outlet temperature is below the minimum of the operation range of the unit, this minimum
should be considered.
Condition
5.5.4 Medium temperature application
Table 12 — Part load conditions for DX-to-water(brine) and water(brine)-to-water(brine), units
in medium temperature application for the reference heating seasons
Outdo
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