30 May 2005

RESEARCH AND DEVELOPMENT OF SMALL-CAPACITY ABSORPTION CHILLER USING WASTE HEAT FROM DISTRIBUTED POWER GENERATION


In this research, a mixing-type absorber is proposed to be used in LiBr/H2O absorption chiller in
order to develop a new small-capacity system with high efficiency and compact structure. The
mixing-type absorber is composed of an ejector and a cooler with subcooled LiBr aqueous solution as
driving flow. The adiabatic absorption inside the ejector and the mixing of solution with water vapor are
expected to promote the absorption efficiency. From the performance experiments of the mixing-type
absorber, it is found that although the two-phase flow inside the ejector was not critical flow, the adiabatic
absorption can be performed efficiently and the system can be composed compact. A cycle simulation
was carried out to investigate the system performance of the absorption chiller using two mixing-type
absorbers in series. As compared to a conventional absorption chiller, the COP is improved by 15%, and
the volume of the mixing-type absorber is decreased by about 50% when compared to a conventional
falling film type absorber.