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BS ISO 21978:2021

BS ISO 21978:2021

$198.66

Heat pump water heater. Testing and rating at part load conditions and calculation of seasonal coefficient of performance for space heating

Published By Publication Date Number of Pages
BSI 2021 56
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The document specifies test conditions for determining the seasonal performance characteristics of air source heat pump water heaters for space heating with electrically driven compressors with or without supplementary heater. The purpose of this document is to rate performance of the heat pump water heaters for space heating with no operation of any supplementary heater. In the case of heat pump water heaters for space heating consisting of several parts with refrigerant or water connections, this document applies only to those designed and supplied as a complete package.

The seasonal coefficient of performance depends, inter alia, on the climate conditions and temperature regime of the space heating distribution network.

This document defines:

  • three design conditions, each of them being characterized by a design temperature which represents the lowest temperature that can occur in that design condition;

  • three water temperature distribution regimes, namely ā€œ temperature applicationā€ in the text.

The user of this document is free to determine the seasonal coefficient of performance for one or more of the defined design conditions and for one or more of the defined temperature applications.

This document also provides a full description of three heating seasons that can be used with the associated design conditions.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
16 4 Symbols
17 5 Installation requirements
5.1 Test apparatus and uncertainties of measurement
18 5.2 Test room for the airside and remote condenser
5.3 Installation and connection of the heat pump
5.4 Installation of heat pumps consisting of several parts
5.5 Environment conditions for indoor unit installation and electrical power supply requirements
19 6 Setting and part load test conditions
6.1 General
6.2 Setting for capacity ratio
6.3 Setting the external static pressure difference for ducted units
6.4 Setting of units with integral pumps
20 6.5 Part load test conditions
24 7 Space heating test
7.1 Heating capacity test
25 7.2 Heating capacity correction
7.2.1 General
7.2.2 Capacity correction of fans for units without duct connection
7.2.3 Capacity correction due to indoor fan for ducted units
7.2.4 Capacity correction due to indoor liquid pump
27 7.2.5 Effective power input
28 7.3 Test procedure
7.3.1 General
29 7.3.2 Preconditioning period
7.3.3 Equilibrium period
7.3.4 Data collection period
7.4 Heating capacity calculation
7.4.1 Steady state capacity test
7.4.2 Transient capacity test
7.5 Effective power input calculation
7.5.1 Steady state test
7.5.2 Transient capacity test
30 7.6 Determination of degradation coefficient Cd
7.7 Test methods for electric power input during thermostat-off mode, standby mode, crankcase heater mode and off mode
7.7.1 Uncertainties of measurement
31 7.7.2 Measurement of electric power input during thermostat-off mode
7.7.3 Measurement of electric power input during standby mode
7.7.4 Measurement of electric power input during crankcase heater mode
7.7.5 Measurement of electric power input during off mode
32 8 Calculation methods for seasonal coefficient of performance (SCOP)
8.1 General formula for calculation of SCOP
8.2 Calculation of the reference annual heating demand, QH
8.3 Calculation of the annual electricity consumption, QHE
33 8.4 Calculation of SCOPon and SCOPnet
34 8.5 Calculation procedure for determination of COPbin values at part load conditions A to G
8.5.1 General
35 8.5.2 Calculation procedure for fixed capacity units
8.5.3 Calculation procedure for staged and variable capacity units
9 Test results and test report
9.1 Data
36 9.2 Test report
37 10 Marking
38 Annex A (normative) Heating capacity test procedures given in 7.3
42 Annex B (normative) Determination of the liquid pump efficiency
46 Annex C (informative) Examples of set of bin hours and hours for active mode, thermostat-off mode, standby mode, off mode and crankcase heater mode
48 Annex D (informative) SCOP calculation for fixed capacity for low temperature application ā€” Example
52 Annex E (informative) SCOP calculation for variable capacity unit for low temperature application ā€”Example

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BS ISO 21978:2021
$198.66