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.