06 November 2008

EFFICIENCY ASPECTS OF HEAT PUMP SYSTEMS – LOAD MATCHING AND PARASITIC LOSSES


Heat pumps often provide efficient solutions for refrigeration, cooling, heating and
hot water. Although there still remains much to improve on the efficiency of the heat pump
per se, in many cases much larger energy savings can be achieved by improving the design
and component efficiencies of the systems that connect the heat pump to the load. Also,
when building envelopes improve and control systems better match supply and demand, the
active operation of the heat pump unit is reduced. Even now, some applications see more
electric energy going into distribution and control than to the operation of the heat pump
compressor. Examples show how the efficiency of existing heat pump systems may be
greatly improved with no changes to the heat pump, how new HVAC system designs may
drastically reduce drive energy to pumps and fans and how the use of ambient conditions
and ground storage may provide cost-effective and efficient means for space conditioning.