Abstract
Currently, there is no established protocol for the long-term performance monitoring of air-to-air heat pumps. This study aims to address critical issues and validate the accuracy of the virtual flow meter formed by temperature difference in practical measurements of heating capacity of heat pumps in the field. The enthalpy difference approach was used on the refrigerant side of the air conditioner to assess the heating capacity of the condenser. These findings suggest that the field virtual flow meter technique introduces a certain level of measurement error when estimating the mass flow rate. Specifically, when the heater-induced temperature difference is in the range of 2.5 °C–4.1 °C, the measurement error for mass flow falls between −5.5 % and 5.8 %. Meanwhile, the measurement error for heating capacity using this method ranges from −6.1 % to 5.8 %. Lastly, a comparison is made between accounting for and neglecting the condenser resistance concerning the error in heating capacity. The field experiment validates the use of the virtual flow meter test method for assessing the heating capacity of the refrigerant side of heat pumps.
Published Version
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