Low-grade-heat-actuated absorption heat pumps for temperature boosting

The present study has resulted in a conceptual design of the heat pump system providing the information needed for the detailed design and construction of a laboratory working system. The basic cycle was studied for use with low-temperature waste heat (60/sup 0/C). Multistaging of the heat pump was investigated for increased temperature boosting and a preferred two-stage configuration was identified. Open cycle evaporation and desorption was considered for cases of low temperature differential between the heat source and sink. Suitable working materials were considered and components performance was analyzed at the conceptual design level. The overall system performance was studied for varying operating conditions. Several improvements in the cycle were considered. A complete computer model of the system was developed to perform the study. The code is available for investigation of different configurations and operating conditions, and will be used in the detailed design of the laboratory system. Technical accomplishments are summarized.