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Advanced heat pump cycle for district heating and cooling systems; Final report

Technical Report ·
OSTI ID:720520
;
In this project the performance potential of vapor compression heat pumps with solution circuits is studied with regard to applications in District Heating and Cooling Systems. Vapor compression heat pumps with solution circuits are Rankine cycles in which the pure refrigerant is replaced by a mixture of two or more components. They offer significant advantages over conventional heat pumps leading to higher efficiencies and larger temperature lifts at low pressure ratios or to completely new applications. The particularity of such cycles is the fact that the working fluid mixture does not evaporate completely in the desorber (evaporator). The remaining liquid phase is recirculated by means of a solution pump into the absorber (condenser). This yields significant performance improvement due to adjustable gliding temperature intervals in the desorber and absorber. Further, the capacity and amount of temperature glide can be controlled by adjusting the circulating mixture composition. Two computer simulation models have been developed to predict the performance of vapor compression heat pumps with solution circuits. The models simulate a single and two-stage ammonia-water cycle currently being tested at the University of Maryland. It was found that the single-stage heat pump performed better than conventional heat pumps for the entire range of concentration investigated resulting in a COP improvement of up to 18%. 7 refs., 24 figs., 2 tabs.
Research Organization:
Maryland Univ., College Park, MD (United States). Dept. of Mechanical Engineering
Sponsoring Organization:
USDOE
DOE Contract Number:
FG01-86CE26568
OSTI ID:
720520
Report Number(s):
DOE/CE/26568--T1; ON: TI90020827
Country of Publication:
United States
Language:
English

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Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
COMPUTERIZED SIMULATION
DESIGN
DISTRICT COOLING
DISTRICT HEATING
EFFICIENCY
HEAT PUMPS
PROGRESS REPORT
RANKINE CYCLE
VAPOR COMPRESSION REFRIGERATION CYCLE