23 March 2006

Gas engine-driven heat pump systems

The “gas heat pump (GHP)” uses a natural gas-powered or LPG-powered engine to drive
the compressor in a vapour-compression refrigeration cycle. The Japanese market for GHP
air conditioners has been growing steadily since they were commercialised, with annual
shipments of about 40 000 outdoor units in recent years. The major factors in their growth
are power savings and low operating costs compared to “electric heat pump (EHP)” systems.
This paper introduces the technology and market trends for the GHP in Japan.