24 June 2014

Pioneering Industrial Heat Pump Technology in Japan

Industrial heat pumps for hot water supply, hot air supply, heating of circulating hot water and steam generation have been developed with a pioneer spirit in Japan. This paper describes the industrial heat pump technology reported by the IEA HPP Annex 35 national expert meeting of Japan. Firstly, a trans-critical CO2 cycle heat pump, single-stage compression
reverse Rankine cycle heat pumps, two-stage compression reverse Rankine cycle heat pumps, a cascade reverse Rankine cycle heat pump and a hybrid vapor recompression system are presented as the high-temperature heat pumps for industrial processes.
Secondly, the industrial applications of these heat pumps are described. Lastly, low GWP refrigerants for high-temperature heat pumps are discussed.