Normalized performance parameters for a residential heat pump in the cooling mode with single faults imposed

•The effects of nine common faults on heat pump cooling performance were correlated.•The correlation may be applied to determine the annual cost of an individual fault.•The normalized correlation is applicable to residential style split heat pump systems.

The cooling mode performance of a residential split heat pump operating under nine different faults was described using normalized performance parameters determined from a ratio of the fault value to the no-fault value obtained from heat pump tests in environmental chambers. The normalized parameters were the coefficient of performance (COP), total capacity, refrigerant-side capacity, sensible heat ratio, outdoor unit power, and total power. A correlation for the normalized performance parameters was developed to produce a continuous representation of the performance characteristics given the fault level and indoor and outdoor temperature conditions.