Performance of a Residential Heat Pump Operating in the Cooling Mode With Single Faults Imposed
William V. Payne, Piotr A. Domanski, Minsung Kim, Christian Hermes
System behavior of a R410A residential unitary split heat pump system operating in the cooling mode was investigated. Seven artificial faults were implemented: compressor/reversing valve leakage, improper outdoor air flow, improper indoor air flow, liquid line restriction, refrigerant undercharge, refrigerant overcharge, and presence of non-condensable gas in the refrigerant. Since the cooling mode expansion device was a thermostatic expansion valve (TXV), the system could adapt itself to considerable external variation. Thus, faulty behavior was not as detectable as it would have been in a system equipped with a fixed area expansion device. The distinctiveness of a fault depended on the TXV status. Heat exchanger faults effects upon performance depend on the sizing of the heat exchanger. Using the fault test database, a rule-based chart was proposed to detect and diagnose the fault. The effect of the various fault levels on EER was also estimated.
International Journal of Heating, Ventilating, Air-conditioning and Refrigerating Research
, Domanski, P.
, Kim, M.
and Hermes, C.
Performance of a Residential Heat Pump Operating in the Cooling Mode With Single Faults Imposed, International Journal of Heating, Ventilating, Air-conditioning and Refrigerating Research, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=861036
(Accessed March 3, 2024)