Analysis of Advanced Conceptual Designs for Single-Family-Sized Absorption Chillers. Semi-Annual Report

摘要

The objective of the research program is to develop and analyze new concepts for absorption cycles to improve the performance or reduce the cost (or both) of a 3-ton absorption chiller that can be used with solar-collected heat. New refrigerant-absorbent pairs, additives to currently used refrigerant-absorbent pairs, and modifications to the cycle are being investigated. For the initial analyses the use of a fluid at 160 to 230 exp 0 F from a solar collector as a heating source is assumed. In the initial analyses the chiller is to provide chilled water at 45 exp 0 F at full load; alternatively, if a new refrigerant-absorbent pair appears to be amenable for direct cooling of the occupied space, the temperature of the evaporator is to be 45 exp 0 F. Both water cooling and air cooling of the absorber and the condenser are being studied. The use of ambient air at 95 exp 0 F dry bulb and 75 exp 0 F wet bulb temperatures is assumed. With the water-cooled cycles, the initial and operating costs of a properly sized cooling tower will be included. The research consists of five principal tasks: (a) acquisition of information for analysis, (b) definition of criteria for selection of promising refrigerant-absorbent pairs, additives for currently used pairs, or cycle modifications, (c) preparation and analysis of conceptual designs, (d) comparison and selection of the promising new systems that warrant further study, and (e) recommendations for further research for each promising new system. Progress on each of these tasks is described. (ERA citation 04:054442)