Non-ducted portable air-cooled air conditioners and air-to-air heat pumps having a single exhaust duct — Testing and rating for performance

This document specifies the standard conditions for capacity and efficiency ratings of non-ducted portable air-cooled air conditioners having a single exhaust duct and non-ducted portable air-cooled heat pumps having a single exhaust duct. Such air conditioners and heat pumps may include an evaporatively cooled condenser cooled by air and the evaporation of: a) condensate collected from the evaporator; b) external supplementary water stored in a supplementary water tank; or c) both a) and b). This document also specifies the test methods for determining the capacity and efficiency ratings. This document applies to equipment that is factory-made, electrically driven and uses mechanical compression. This document is applicable to equipment utilizing one or more refrigeration systems. This document is not applicable to the rating and testing of the following: i) Water-source heat pumps or water-cooled air conditioners; ii) Multi-split-system air conditioners and air-to-air heat pumps (see ISO 15042:2017 for the testing of such equipment); iii) Individual assemblies not constituting a complete refrigeration system; iv) Equipment using the absorption refrigeration cycle; v) Ducted equipment (see ISO 13253:2017 for the testing of such equipment); vi) Evaporative coolers or any other cooling systems that are not of the vapour compression type; vii) Dehumidifiers; viii) Spot coolers.

Climatiseurs refroidis par air et pompes à chaleur portables non raccordés à simple conduit — Essais et détermination des caractéristiques des performances

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Published
Publication Date
04-Sep-2018
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6060 - International Standard published
Completion Date
05-Sep-2018
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ISO 18326:2018 - Non-ducted portable air-cooled air conditioners and air-to-air heat pumps having a single exhaust duct -- Testing and rating for performance
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INTERNATIONAL ISO
STANDARD 18326
First edition
2018-09
Non-ducted portable air-cooled air
conditioners and air-to-air heat
pumps having a single exhaust duct —
Testing and rating for performance
Climatiseurs refroidis par air et pompes à chaleur portables
non raccordés à simple conduit — Essais et détermination des
caractéristiques des performances
Reference number
ISO 18326:2018(E)
ISO 2018
---------------------- Page: 1 ----------------------
ISO 18326:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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ISO 18326:2018(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols .......................................................................................................................................................................................................................... 5

5 Cooling tests .............................................................................................................................................................................................................. 7

5.1 Cooling capacity test .......................................................................................................................................................................... 7

5.1.1 General conditions ......................................................................................................................................................... 7

5.1.2 Condensate containers ............................................................................................................................................... 7

5.1.3 Tests using supplementary water evaporation feature .................................................................. 7

5.1.4 Temperature conditions ............................................................................................................................................ 8

5.1.5 Airflow conditions — Air quantity ................................................................................................................... 9

5.1.6 Test conditions................................................................................................................................................................... 9

5.2 Maximum cooling performance test..................................................................................................................................... 9

5.2.1 General conditions ......................................................................................................................................................... 9

5.2.2 Temperature conditions ............................................................................................................................................ 9

5.2.3 Temperature conditions .........................................................................................................................................10

5.2.4 Performance requirements ..................................................................................................................................10

5.3 Condensate control and enclosure sweat performance test ........................................................................11

5.3.1 General conditions ......................................................................................................................................................11

5.3.2 Temperature conditions .........................................................................................................................................11

5.3.3 Airflow conditions .......................................................................................................................................................11

5.3.4 Test conditions................................................................................................................................................................11

5.3.5 Performance requirements ..................................................................................................................................11

6 Heating tests...........................................................................................................................................................................................................12

6.1 Heating capacity tests ....................................................................................................................................................................12

6.1.1 General conditions ......................................................................................................................................................12

6.1.2 Temperature conditions .........................................................................................................................................13

6.1.3 Airflow conditions — Air quantity ................................................................................................................13

6.1.4 Test conditions................................................................................................................................................................13

6.2 Maximum heating performance test .................................................................................................................................14

6.2.1 General conditions ......................................................................................................................................................14

6.2.2 Temperature conditions .........................................................................................................................................14

6.2.3 Airflow conditions .......................................................................................................................................................14

6.2.4 Test conditions................................................................................................................................................................14

7 Test methods and uncertainties of measurements .......................................................................................................15

7.1 Test methods ..........................................................................................................................................................................................15

7.1.1 General...................................................................................................................................................................................15

7.1.2 Calorimeter test method ........................................................................................................................................15

7.1.3 Capacity tests ...................................................................................................................................................................15

7.2 Uncertainties of measurement ...............................................................................................................................................15

7.3 Test tolerances for steady-state cooling and heating tests ............................................................................15

7.3.1 Variation of individual observations ...........................................................................................................15

7.3.2 Variation of average observations .................................................................................................................16

7.3.3 Sampling rate ...................................................................................................................................................................16

7.3.4 Tolerances for capacity calculations ............................................................................................................17

7.4 Test tolerances for performance tests .............................................................................................................................17

8 Test capacity results.......................................................................................................................................................................................17

8.1 Capacity results ...................................................................................................................................................................................17

8.1.1 General...................................................................................................................................................................................17

© ISO 2018 – All rights reserved iii
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ISO 18326:2018(E)

8.1.2 Adjustments ......................................................................................................................................................................17

8.1.3 Cooling capacity calculations .............................................................................................................................18

8.1.4 Heating capacity calculations ............................................................................................................................18

8.2 Data to be recorded ..........................................................................................................................................................................18

8.3 Test report ................................................................................................................................................................................................18

8.3.1 General information ...................................................................................................................................................18

8.3.2 Capacity tests ...................................................................................................................................................................20

9 Marking provisions .........................................................................................................................................................................................20

9.1 Nameplate requirements ............................................................................................................................................................20

9.2 Nameplate information ................................................................................................................................................................20

10 Publication of ratings ...................................................................................................................................................................................21

10.1 Standard ratings .................................................................................................................................................................................21

10.1.1 General...................................................................................................................................................................................21

10.1.2 Units .........................................................................................................................................................................................21

10.1.3 EER and COP .....................................................................................................................................................................21

10.1.4 Capacity rating and test voltage ......................................................................................................................21

10.2 Other ratings ..........................................................................................................................................................................................21

Annex A (normative) Test requirements ......................................................................................................................................................22

Annex B (normative) Units with a supplementary water-tank — Determining the duration

of supplementary water evaporation feature .....................................................................................................................26

Annex C (informative) Airflow measurement ..........................................................................................................................................28

Annex D (normative) Calorimeter test method ......................................................................................................................................34

Annex E (informative) Cooling condensate measurements .......................................................................................................44

Annex F (informative) Example of multiple point air sampling apparatus ..............................................................45

Bibliography .............................................................................................................................................................................................................................47

iv © ISO 2018 – All rights reserved
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ISO 18326:2018(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www .iso .org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 86, Refrigeration and air-conditioning,

Subcommittee SC 6, Testing and rating of air-conditioners and heat pumps.
© ISO 2018 – All rights reserved v
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ISO 18326:2018(E)
Introduction

Single duct portable air conditioners and heat pumps can be selected for their ease and rapidity of

use, handling and installation, in particular when the use of other categories of air conditioners is not

convenient or forbidden, for example in rented or holiday houses or in historical buildings where an

external unit cannot be placed outdoors.

The operational mode and features of such appliances are quite different from those of the well-known

non-ducted air conditioners and heat pumps largely diffused worldwide and covered by ISO 5151.

There are presently no internationally recognized standards for single duct portable air conditioners

and heat pumps. The economic operators involved in the production and distribution of such products

face significant problems in verifying and declaring performance and energy consumption data in an

objective and internationally recognized way.

This being considered, ISO/TC 86/SC 6 decided to prepare a specific standard for single duct portable

air conditioners and heat pumps.

During the discussion of its contents it was acknowledged that it is necessary to provide the users with

information on the specific characteristics of single duct portable air conditioners and heat pumps, on

their correct installation and on their use. This will be covered by a future Amendment to this document

which is currently under discussion.
vi © ISO 2018 – All rights reserved
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INTERNATIONAL STANDARD ISO 18326:2018(E)
Non-ducted portable air-cooled air conditioners and air-to-
air heat pumps having a single exhaust duct — Testing and
rating for performance
1 Scope

This document specifies the standard conditions for capacity and efficiency ratings of non-ducted

portable air-cooled air conditioners having a single exhaust duct and non-ducted portable air-cooled

heat pumps having a single exhaust duct. Such air conditioners and heat pumps may include an

evaporatively cooled condenser cooled by air and the evaporation of:
a) condensate collected from the evaporator;
b) external supplementary water stored in a supplementary water tank; or
c) both a) and b).

This document also specifies the test methods for determining the capacity and efficiency ratings.

This document applies to equipment that is factory-made, electrically driven and uses mechanical

compression. This document is applicable to equipment utilizing one or more refrigeration systems.

This document is not applicable to the rating and testing of the following:
i) Water-source heat pumps or water-cooled air conditioners;

ii) Multi-split-system air conditioners and air-to-air heat pumps (see ISO 15042:2017 for the testing of

such equipment);
iii) Individual assemblies not constituting a complete refrigeration system;
iv) Equipment using the absorption refrigeration cycle;
v) Ducted equipment (see ISO 13253:2017 for the testing of such equipment);

vi) Evaporative coolers or any other cooling systems that are not of the vapour compression type;

vii) Dehumidifiers;
v iii) Spot coolers.
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.

ISO 817, Refrigerants — Designation and safety classification
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http: //www .electropedia .org/
© ISO 2018 – All rights reserved 1
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ISO 18326:2018(E)
— ISO Online browsing platform: available at https: //www .iso .org/obp
3.1
bypassed indoor airflow

rate of flow of conditioned air directly from the indoor-side outlet to the indoor-side inlet of the

equipment
Note 1 to entry: See Figure 1.
3.2
coefficient of performance
COP

ratio of the heating capacity to the total power input to the device at any given set of rating conditions

Note 1 to entry: Where the COP is stated without an indication of units, it is understood that it is derived from

watts/watt.
3.3
conditioned space
enclosed space, room or zone to which conditioned air is delivered
3.4
dehumidifer

encased assembly designed to remove moisture from its surrounding atmosphere using either an

electrically operated refrigeration system or a desiccant type of material including a means to circulate

air and a drain arrangement for collecting and storing and/or disposing of the condensate

3.5
total power input
average electrical power input to the equipment as measured during the test
Note 1 to entry: Total power input is expressed in units of watts.
3.6
ventilation airflow
rate of flow of air introduced to the conditioned space through the equipment
3.7
equalizer opening airflow

rate of flow of air from the outdoor side through the equalizer opening in the partition wall of a

calorimeter to the indoor side
Note 1 to entry: See Figure 1.
3.8
evaporatively cooled condenser

heat exchanger that condenses refrigerant vapour by rejecting heat to a water and air mixture causing

the water to evaporate and increase the enthalpy of air

Note 1 to entry: Desuperheating and sub-cooling of the refrigerant may also occur.

3.9
exhaust airflow

rate of flow of air from the indoor side through the equipment to the outdoor side

Note 1 to entry: See Figure 1.
3.10
full-load operation

operation with the equipment and controls configured for the maximum continuous duty refrigeration

capacity specified by the manufacturer and allowed by the unit controls
2 © ISO 2018 – All rights reserved
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ISO 18326:2018(E)
3.11
heating capacity

amount of heat that the equipment can add to the conditioned space (but not including supplementary

heat) in a defined interval of time

Note 1 to entry: Heating capacity is expressed in units of watts. Manually selectable supplementary heaters are

disabled during capacity tests, but any automatic supplementary heaters are permitted to operate.

3.12
indoor compartment
indoor-side compartment

testing room simulating the conditioned space (and containing the tested appliance)

Note 1 to entry: See Figure 1.
3.13
indoor discharge airflow
rate of flow of air from the outlet of the equipment into the conditioned space
Note 1 to entry: See Figure 1.
3.14
indoor heat exchanger

heat exchanger which is designed to remove heat from the indoor part of the building or to transfer

heat to it

Note 1 to entry: In the case of an air conditioner or heat pump operating in the cooling mode, this is the evaporator.

In the case of an air conditioner or heat pump operating in the heating mode, this is the condenser.

3.15
indoor intake airflow
rate of flow of air into the equipment from the conditioned space
Note 1 to entry: See Figure 1.
3.16
latent cooling capacity

amount of latent heat that the equipment can remove from the conditioned space in a defined

interval of time
Note 1 to entry: Latent cooling capacity is expressed in units of watts.

Note 2 to entry: “Latent cooling capacity” is also known as “room dehumidifying capacity”.

3.17
leakage airflow

rate of flow of air interchanged between the indoor side and outdoor side through the equipment as a

result of its construction features and sealing techniques
Note 1 to entry: See Figure 1.
3.18
non-ducted portable air-cooled air conditioner having a single exhaust duct

encased assembly, designed primarily to provide free delivery of conditioned air to an enclosed space,

room or zone which takes its source of air for cooling the condenser from the conditioned space, and

discharges this air through a duct to the outdoor space

Note 1 to entry: Such air conditioners comprise a primary source of refrigeration for cooling and dehumidification.

They can also include means for heating other than a heat pump, as well as means for circulating, cleaning,

humidifying, ventilating or exhausting air.
© ISO 2018 – All rights reserved 3
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ISO 18326:2018(E)
3.19
non-ducted portable air-cooled heat pump having a single exhaust duct

encased assembly designed primarily to provide free delivery of conditioned air to an enclosed space,

room or zone and includes a prime source of refrigeration for heating and which takes its source of air for

the evaporator from the conditioned space, and discharges this air through a duct to the outdoor space

Note 1 to entry: Such heat pumps can be constructed to remove heat from the conditioned space and discharge it

to a heat sink if cooling and dehumidification are desired from the same equipment. They can also include means

for circulating, cleaning, humidifying, ventilating or exhausting air.
3.20
outdoor compartment

compartment where the exhaust air is rejected through the duct of single duct air conditioner

3.21
outdoor exhaust airflow
discharge rate of flow of air from the equipment through the exhaust duct
Note 1 to entry: See Figure 1.
3.22
outdoor heat exchanger

heat exchanger that is designed to transfer heat to the outdoor ambient environment or to remove

heat from it

Note 1 to entry: In the case of an air conditioner or heat pump operating in the cooling mode, this is the condenser.

In the case of an air conditioner or heat pump operating in the heating mode, this is the evaporator.

3.23
rated frequency
frequency shown on the nameplate of the equipment
3.24
rated voltage
voltage shown on the nameplate of the equipment
3.25
sensible cooling capacity

amount of sensible heat that the equipment can remove from the conditioned space in a defined

interval of time
Note 1 to entry: Sensible cooling capacity is expressed in units of watts.
3.26
sensible heat ratio
SHR
ratio of the sensible cooling capacity to the total cooling capacity
3.27
spot cooler

encased assembly air conditioner that lies wholly within a conditioned space and that draws air for

both the evaporator and condenser from the conditioned space and expels both of these back into the

conditioned space
Note 1 to entry: A spot cooler is usually portable.
3.28
standard air

dry air at 20 °C and at a standard barometric pressure of 101,325 kPa, having a mass density of

1,204 kg/m
4 © ISO 2018 – All rights reserved
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ISO 18326:2018(E)
3.29
supplementary water tank

tank designed as an integral part of the unit to contain external supplementary water which is fed to

the evaporatively cooled condenser
3.30
total cooling capacity

amount of sensible and latent heat that the equipment can remove from the conditioned space in a

defined interval of time
Note 1 to entry: Total cooling capacity is expressed in units of watts.
Key
1 outdoor compartment (3.20)
2 outdoor exhaust airflow (3.21)
3 exhaust airflow (3.9)
4 leakage airflow (3.17)
5 equalizer opening airflow (3.7)
6 indoor intake airflow (3.15)
7 bypassed indoor airflow (3.1)
8 indoor discharge airflow (3.13)
9 indoor compartment (3.12)
Figure 1 — Airflow diagram illustrating the airflow definitions
4 Symbols
Symbol Description Unit
A coefficient, heat leakage J/(s·K)
A area, nozzle m
C nozzle discharge coefficient
c specific heat of air, moist air J/(kg·K)
c specific heat of water J/(kg·K)
D nozzle throat diameter m
D outside diameter of refrigerant tube m
f factor, dependent on temperature, for R —
h specific enthalpy of water or steam supplied to indoor side compartment J/kg
h specific enthalpy of condensed moisture leaving indoor side compartment J/kg
© ISO 2018 – All rights reserved 5
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ISO 18326:2018(E)
Symbol Description Unit
h specific enthalpy of condensed moisture leaving outdoor-side comportment J/kg
h specific enthalpy of the water supplied to the outdoor side test chamber J/kg

h specific enthalpy of the condensed water (in the case of H1 test condition) and the J/kg

frost, respectively (in the case of H2 or H3 test conditions) in the test unit
K latent heat of vaporization of water (2 460 × 10 J/kg at 15 °C) J/kg
R Reynolds number —
...

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