prEN 12900
(Main)Refrigerant compressors - Rating conditions, tolerances and presentation of performance data
Refrigerant compressors - Rating conditions, tolerances and presentation of performance data
This document specifies the rating conditions, tolerances and the method of presenting performance data of refrigerant compressors.
This document is applicable to single stage compressor and two stage compressor data with or without an additional intermediate pressure inlet.
The performance data of compressors used with R-744 in transcritical operation are covered in this document.
The data relating to the refrigerating capacity, heating capacity and power absorbed include requirements for part load operation where applicable. Presenting performance in this way enables a comparison of different compressors.
Kältemittel-Verdichter - Nennbedingungen, Toleranzen und Darstellung von Leistungsdaten
Dieses Dokument legt die Nennbedingungen, Toleranzen und die Darstellung der Leistungsdaten von Kältemittel-Verdichtern fest.
Dieses Dokument gilt für Daten von einstufigen und zweistufigen Verdichter mit oder ohne zusätzlichen Mitteldruck-Eintritt.
Die Leistungsdaten von Verdichtern, bei denen R 744 im transkritischen Betrieb zur Anwendung kommt, werden von diesem Dokument abgedeckt.
Die Daten beziehen sich auf die Kälteleistung, die Heizleistung und die Leistungsaufnahme und schließen den Teillastbetrieb ein, sofern zutreffend. Diese Darstellung der Leistung ermöglicht den Vergleich verschiedener Verdichter.
Compresseurs pour fluides frigorigènes - Détermination des caractéristiques, tolérances et présentation des données de performance
Le présent document spécifie les conditions de détermination des caractéristiques, les tolérances et le mode de présentation des données de performance, applicables aux compresseurs pour fluides frigorigènes.
Le présent document s’applique aux données de compresseurs mono-étagés et aux compresseurs bi-étagés, avec ou sans entrée de pression intermédiaire supplémentaire.
Les données de performance des compresseurs utilisés avec du R-744 en fonctionnement transcritique sont couvertes dans le présent document.
Les données relatives à la puissance frigorifique, à la puissance calorifique et à la puissance absorbée comprennent les exigences relatives au fonctionnement en charge partielle, quand cela est applicable. Cette manière de présenter les performances permet la comparaison de différents compresseurs.
Kompresorji za hladilne tekočine - Pogoji določanja nazivne moči, toleranc in predstavitev tehničnih karakteristik
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2024
Nadomešča:
SIST EN 12900:2013
Kompresorji za hladilne tekočine - Pogoji določanja nazivne moči, toleranc in
predstavitev tehničnih karakteristik
Refrigerant compressors - Rating conditions, tolerances and presentation of
performance data
Kältemittel-Verdichter - Nennbedingungen, Toleranzen und Darstellung von
Leistungsdaten
Compresseurs pour fluides frigorigènes - Détermination des caractéristiques, tolérances
et présentation des données de performance
Ta slovenski standard je istoveten z: prEN 12900
ICS:
23.140 Kompresorji in pnevmatični Compressors and pneumatic
stroji machines
27.200 Hladilna tehnologija Refrigerating technology
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2023
ICS 23.140; 27.200 Will supersede EN 12900:2013
English Version
Refrigerant compressors - Rating conditions, tolerances
and presentation of performance data
Compresseurs pour fluides frigorigènes - Conditions de Kältemittel-Verdichter - Nennbedingungen, Toleranzen
détermination des caractéristiques, tolérances et und Darstellung von Leistungsdaten
présentation des performances par le fabricant
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 113.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12900:2023 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Rating conditions . 8
4.1 General . 8
4.2 Ambient temperature around the compressor . 8
4.3 Subcooling . 8
4.4 Gas cooler outlet temperature . 8
4.5 Application of economising . 8
5 Performance data . 9
5.1 General . 9
5.2 Tabular or graphical form . 10
5.3 Polynomial form . 10
6 Standard reference points . 10
7 Tolerances . 12
8 Conversion methods . 15
8.1 Suction gas superheat . 15
8.2 Compressor speed for open drive compressors . 15
Annex A (informative) Calculation of dew point temperatures from given mean temperatures . 16
European foreword
This document (prEN 12900:2023) has been prepared by Technical Committee CEN/TC “Heat pumps
and air conditioning units”, the secretariat of which is held by UNE.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12900:2013.
In comparison with the previous edition, the following technical modifications have been made:
a) The content was updated to match the current other standards in the topic area;
b) Clause 3 “Terms and definitions” was modified;
c) A definition of heating capacity was added to Clause 3;
d) Clause 4 has been revised to simplify the tables;
e) Annex A “Calculation of dew point temperatures from given mean temperatures” was added.
Introduction
The performance data of a refrigerant compressor is commonly expressed as the refrigerating capacity
and power consumption when applied in an ideal refrigeration cycle. An ideal cycle is one in which there
is no pressure drop or heat transmission through the pipework between the major circuit components.
Optionally, the heating capacity, i.e. heat delivered by the condenser or gas cooler, can be shown.
This document defines the conditions that shall be quoted when performance data are presented, so that
comparison of different compressors can be easily made.
1 Scope
This document specifies the rating conditions, tolerances and the method of presenting performance data
of refrigerant compressors.
This document is applicable to single stage compressor and two stage compressor data with or without
an additional intermediate pressure inlet.
The performance data of compressors used with R-744 in transcritical operation are covered in this
document.
The data relating to the refrigerating capacity, heating capacity and power absorbed include
requirements for part load operation where applicable. Presenting performance in this way enables a
comparison of different compressors.
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 13771-1, Compressors and condensing units for refrigeration - Performance testing and test methods -
Part 1: Refrigerant compressors
EN 378-1:2016+A1:2020, Refrigerating systems and heat pumps - Safety and environmental requirements
- Part 1: Basic requirements, definitions, classification and selection criteria
ISO 817, Refrigerants — Designation and safety classification
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 378-1:2016+A1:2020 and the
following apply.
— ISO Online browsing platform: available at http://www.iso.org/obp/
— IEC Electropedia: available at http://www.electropedia.org/
3.1
compressor
device for mechanically increasing the pressure of a refrigerant vapour
[SOURCE: EN 378-1:2016+A1:2020, 3.4.3]
3.2
refrigerating capacity
product of the refrigerant low pressure mass flow rate through the compressor and the specific
refrigerant enthalpy difference between the compressor low pressure inlet and the state defined by
subcooling, gas cooler outlet conditions or liquid temperature the state at inlet of the low pressure
evaporator
Note 1 to entry: For single stage cycles the enthalpy difference is h1-h3 in the respective p-h diagram. For multi-
stage expansion cycles it is h1-h4 in the respective p-h diagram. See Figure 1.
Note 2 to entry: The refrigerant at the low stage compressor inlet is superheated above the suction dew point
temperature to the stated value.
a) p-h diagram for single stage cycles b) p-h diagram for multi-stage cycles
Key
1: compressor inlet I: compression
2: compressor outlet II: condensation
3: inlet of the expansion device III: expansion
4: (only in subfigure b)) inlet of the low stage expansion device IV: evaporation
m: compressor suction mass flow rate
Figure 1 — p-h diagram
3.3
heating capacity
Q
h
sum of refrigerating capacity and power absorbed
Note 1 to entry: As simplification all losses (compressor and inverter heat losses) for the power absorbed are
assumed to create useful heat
3.4
subcooling
difference between the bubble point temperature of the refrigerant for a given pressure and the
temperature of the liquid refrigerant
Note 1 to entry: The given pressure can be the compressor discharge pressure or the flash tank pressure
3.5
suction gas superheat
difference between the dew point temperature of the refrigerant corresponding to the compressor
suction pressure and the suction gas temperature of the refrigerant at the compressor inlet
3.6
power absorbed
power at the compressor shaft
3.7
power absorbed
electrical power input at the motor
terminals
3.8
power absorbed
electrical power input at the
inverter input terminals
3.9
refrigerating coefficient of performance
COP
r
ratio of refrigerating capacity to the power absorbed
3.10
heating coefficient of performance
COP
h
ratio of heating capacity to the power absorbed
3.11
subcritical operation
operating condition with discharge pressure level below the critical pressure
3.12
transcritical operation
operating condition with discharge pressure level above the critical pressure
3.13
part load operation
operation with active capacity control at reduced capacity, for compressors with capacity control
mechanism
3.14
fluid
refrigerant liquid, gas or vapour including the state of appearance close to and above the critical pressure
3.15
evaporating temperature
t
temperature between the evaporating dew point and the evaporator inlet temperature of the refrigerant
at the pressure of the compressor inlet
Note 1 to entry: For refrigerants without glide the evaporating temperature is equal to the dew point temperature
at the compressor inlet pressure.
Note 2 to entry: For refrigerants with glide the evaporating temperature is defined as dew point, as arithmetic mean
or thermodynamic mean temperature as calculated according to Annex A.
3.16
condensing temperature
t
c
temperature between the condensing dew point and the bubble point of the refrigerant at the compressor
discharge pressure
Note 1 to entry: For refrigerants without glide the condensing temperature is equal to the dew point temperature
at the compressor discharge pressure.
Note 2 to entry: For refrigerants with glide the condensing temperature is defined as dew point, as arithmetic mean
or thermodynamic mean temperature as calculated according to Annex A.
3.17
economiser heat exchanger
heat exchanger which cools refrigerant fluid leaving the condenser or gas cooler by evaporating a portion
of that refrigerant at an intermediate pressure
4 Rating conditions
4.1 General
The parameters shown in Table 1 and in the following text shall be used for the presentation of
performance data.
Table 1 — Param
...
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