COMMERCIAL CO2 HOT WATER HEAT PUMP FIELD TRIALS
United Technologies Research Center, under contract to the US Department of Energy, is performing pre-commercial field trial testing of a commercially sized heat pump water heating system using CO2 as the working fluid. This system has a nominal capacity of 60 kW and performance of 3.5 COP at 10ºC water inlet temperature and 10ºC ambient air temperature. As such, the system is suitable for hotels, restaurants, cafeterias, dormitories, hospitals, laundromats, and many other commercial and industrial applications. The system is described and operational experience and economics from field trial sites is presented.