4.4 Article

A new method for field test of the heating capacity of air source heat pumps

Journal

FLOW MEASUREMENT AND INSTRUMENTATION
Volume 85, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.flowmeasinst.2022.102168

Keywords

Air source heat pump; Electric heater; Mass flow rate; Heating capacity; Field test

Funding

  1. National Key RD Plan of China [2019YFE0103000]
  2. Science and Technology Project of the Ministry of Housing and Urban-Rural Development of People's Republic of China [2021-K-161]

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This study proposes a novel method for measuring the heating capacity of air source heat pumps. By installing an auxiliary electric heater and calculating the refrigerant mass flow rate based on energy conservation, the heating capacity can be accurately calculated. The experimental results show that this method has a high level of accuracy and has a minimal impact on the heating capacity of the heat pumps.
The operation performance measurement of the air source heat pumps in the field, in which conditions are complicated and the accuracy could not be ensured, is very crucial for its performance evaluation and improvement. In this investigation, a novel method for measuring the heating capacity of the air source heat pump is established. An auxiliary electric heater is installed along the pipeline between the compressor and the condenser, and the refrigerant temperature difference caused by the heater is gathered to calculate the refrigerant mass flow rate based on the energy conservation. The heating capacity is calculated with the measured data of the refrigerant enthalpy at the inlet and outlet of the condenser and the refrigerant mass flow rate of the compressor discharge pipe. The validation results in laboratory tests show that the measured heating capacity accuracy is within 9.2%. It is also found that the impact of the novel test method on the heating capacity of the air source heat pumps is below 1.7%, and the power consumption of the tested units is increasing of within 1.8% compared with it when the electric heater is off. The refrigerant enthalpy difference method with an electric heater presented in this research can be applied to measure the heating capacity of different air source heat pump air heaters accurately in the field, which will be much helpful to improve the performance for cleaning heating in northern China.

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