Stirling engine and Stirling engine driven heat pump system (SEHP) has been developing in four years project assisted by Ministry of International Trade and Industry (MITI).
In this development, 6 kW output displacer type engine and 5HP class SEHP installing with that engine were designed and manufactured Several component technologies such as combustor, heat exchanger, crank mechanism, mechanical seal etc. were also investigated in order to ensure the engine reliability.
For the performance of SEHP, a capacity of 12,500 kcal/hr for cooling and 15,000 kcal/hr for heating, respectively, was achieved. Approximately 20,000 hours of accumulative operation time in total of 9 units and 7,000 hours of the one unit longest time were recorded in the field test, which demonstrated durability of SEHP.