ISO 13256-2:2021 Water-source heat pumps — Testing and rating for performance —Part 2: Water-to-water and brine-to-water heat pumps

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Water-source heat pumps — Testing and rating for performance —Part 2: Water-to-water and brine-to-water heat pumps是国际标准化组织(International Organization for Standardization，简称ISO)发布的ISO标准，适用于全球范围。

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INTERNATIONAL STANDARD ISO 13256-2:2021

Water-source heat pumps — Testing and rating for performance —

Part 2: Water-to-water and brine-to-water heat pumps

1 Scope

1.1 This document establishes performance testing and rating criteria for factory-made residential, commercial and industrial, electrically-driven, mechanical- compression type, water-to-water and brine-

to-water heat pumps. The requirements for testing and rating contained in this document are based on the use of matched assemblies.

1.2 Equipment may be designed for rating at one or several source and load side temperature conditions described in this document.

1.3 This document does not apply to the testing and rating of individual assemblies for separate use, nor to the testing and rating of heat pumps covered in ISO 5151, ISO 13253 or ISO 13256-1.

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 a nd definiti ons

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:

— ISO Online browsing platform: available at https://www.iso.org/obp

— IEC Electropedia: available at http://www.electropedia.org/

3.1

water-to-water heat pump

brine-to-water heat pump

heat pump which consists of one or more factory-made assemblies which normally include an indoor side refrigerant to water heat exchanger (load side), compressor(s), and outdoor-side refrigerant-to-

water or refrigerant-to-brine heat exchanger(s) (source side), including means to provide both cooling and heating, cooling-only, or heating-only functions

Note 1 to entry: When such equipment is provided in more than one assembly, the separated assemblies should be designed to be used together.

Note 2 to entry: Such equipment may also provide functions of sanitary water heating.

ISO 13256-2:2021

3.2

water-loop heat pump

water-to-water heat pump using, on the source side, a liquid circulating in a common piping loop

Note 1 to entry: The temperature of the liquid loop is usually within a range of 10 °C to 30 °C.

3.3

ground-water heat pump

water-to-water heat pump using, on source side, water pumped from a well, lake, or stream

Note 1 to entry: The temperature of the water is related to the climatic conditions and is generally constant within the range from 5 °C to 25 °C for deep wells.

3.4

ground-loop heat pump

brine-to-water heat pump using, on the source side, a brine solution circulating through a subsurface piping loop

Note 1 to entry: The heat exchange loop may be placed in horizontal trenches or vertical bores, or be submerged in a body of surface water.

Note 2 to entry: The temperature of the brine is related to the heat exchange load and climatic conditions and is generally within a range from –5 °C to 40 °C.

3.5

cooling capacity

amount of heat that the equipment can remove from the water used to condition the indoor space in a defined interval of time

Note 1 to entry: Expressed in units of watts.

3.6

net cooling capacity

cooling capacity with load side liquid pump power adjustment

Note 1 to entry: Expressed in units of watts.

3.7

heating capacity

amount of heat that the equipment can add to the water used to condition the indoor space in a defined interval of time

Note 1 to entry: Expressed in units of watts.

3.8

net heating capacity

heating capacity with load side liquid pump power adjustment

Note 1 to entry: Expressed in units of watts.

3.9

rated voltage

voltage shown on the nameplate of the equipment

Note 1 to entry: Expressed in units of volts.

3.10

rated frequency

frequency shown on the nameplate of the equipment

Note 1 to entry: Expressed in units of Hz.

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