30 May 2005

DEVELOPMENT OF HYBRID-TYPE ADSORPTION HEAT PUMP ADDING ELECTRICALLY OPERATED PUMP


In Japan, a tremendous amount of heat energy below 373 K is discharged into atmosphere as
waste heat, and it accounts for about 80 % of heat loss. Advanced utilization of such low temperature
heat energy leads to establishment of a highly-efficient energy utilization system.
Adsorption heat pump (AHP) is very attractive technology for achieving the objective, because it
can generate cold heat energy below 283 K for air conditioning by utilizing the low temperature heat
energy as regeneration heat source of an adsorbent. However, heat output and COP of the
conventional thermally-operated AHP decrease significantly as regeneration temperature.
We have proposed a hybrid type AHP aiding electrically-operated suction pump. In the proposed
AHP, a mechanical booster pump (MBP) is incorporated into the thermally-operated silica gel/water
type AHP as a suction pump, and works for promoting water vapor transportation between an
adsorber and evaporator/condenser. We have studied effect of MBP power on heat output performance
of AHP experimentally. It is demonstrated that the proposed AHP can achieve 1.6 times as large heat
output performance as the thermally-operated AHP.