The design and initial testing of a prototype Stirling cycle heat pump

This paper covers thefirst step of an investigation into the potential of the Stirling cycle heat pump. The design and construction of a prototype is described. Particular reference is made to the use of a previously developed theoretical model in the design optimization of the heat exchangers and regenerator. The resultant machine has been tested over a wide range of heat delivery temperatures and temperature lifts, using a pair of hot oil circuits to exchange heat with. Though these initial tests have revealed two design paws, which have seriously reduced the values attained for the coeficient of’ performance, they have demonstrated the ability of the Stirling cycle heat pump to deliver heat at higher temperatures and over larger temperature lifts than established types of heat pump.