22 May 2008

STEAM-GENERATING HEAT PUMPS USING MULTI-STAGE CENTRIFUGAL COMPRESSORS FOR INDUSTRIAL APPLICATIONS


Feasibility of steam-generating heat pumps for industrial applications is
investigated. The heat pump system uses water as refrigerant, and it includes a multi-stage
centrifugal compressor with water atomization cooling at the intra-stage of the compressor. A
component test apparatus is developed to validate design methodology of steam compressor
operating under high negative pressures (less than 20kPa absolute) and to check the
effectiveness of water atomization cooling. Test results show that compressor performance
satisfies the system requirements, and that water atomization cooling can lower steam
temperature effectively.