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BS ISO 21978:2023 - TC Tracked Changes. Air to water heat pumps. Testing and rating at part load conditions and calculation of seasonal coefficient of performance for space heating, 2023
- A-30442964.pdf [Go to Page]
- National foreword
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols
- 5 Installation requirements [Go to Page]
- 5.1 Test apparatus and uncertainties of measurement
- 5.2 Test room for the airside
- 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
- 6 Setting and part load test conditions [Go to Page]
- 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
- 6.5 Part load test conditions
- 7 Space heating test [Go to Page]
- 7.1 Heating capacity test
- 7.2 Heating capacity correction [Go to Page]
- 7.2.1 General
- 7.2.2 Capacity correction due to indoor liquid pump
- 7.2.3 Effective power input
- 7.3 Test procedure [Go to Page]
- 7.3.1 General
- 7.3.2 Permissible deviations
- 7.3.3 Preconditioning period
- 7.3.4 Equilibrium period
- 7.3.5 Data collection period
- 7.4 Heating capacity calculation [Go to Page]
- 7.4.1 Steady state capacity test
- 7.4.2 Transient capacity test
- 7.5 Effective power input calculation [Go to Page]
- 7.5.1 Steady state test
- 7.5.2 Transient capacity test
- 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 [Go to Page]
- 7.7.1 Uncertainties of measurement
- 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
- 8 Calculation methods for seasonal coefficient of performance (SCOP) [Go to Page]
- 8.1 General formula for calculation of SCOP
- 8.2 Calculation of the reference annual heating demand, QH
- 8.3 Calculation of the annual energy consumption, QHE
- 8.4 Calculation of SCOP,on and SCOP,net
- 8.5 Calculation procedure for determination of CPb values at part load conditions A to G [Go to Page]
- 8.5.1 General
- 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 [Go to Page]
- 9.1 Data
- 9.2 Test report
- 10 Marking provisions [Go to Page]
- 10.1 General
- 10.2 Nameplate requirements
- 10.3 Nameplate information
- Annex A (normative) Heating capacity test procedures given in 7.3
- Annex B (normative) Determination of the liquid pump efficiency
- 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
- Annex D (informative) SCOP,on and SCOP,net calculation for fixed capacity for 35 °C temperature application — Example
- Annex E (informative) SCOP,on and SCOP,net calculation for variable capacity unit for 35 °C temperature application — Example
- Bibliography [Go to Page]
