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Title: Heat pump concepts for industrial use of waste heat

Heat pump systems for recovering waste heat are considered. To compare different cycles on a consistent basis, a definition of performance based on the Second Law of Thermodynamics is presented. A high-grade heat-actuated cycle that uses a steam ejector is analyzed, but no substantial development effort is anticipated for implementing heat pumps of this type. Three residual-heat-actuated-heat pumps are analyzed. A turbine-compressor heat pump is presented that can attain relatively high delivery temperatures (approximately 120 to 130/sup 0/C from a source at 60/sup 0/C. The other two residual-heat-actuated concepts presented are absorption heat pumps. One operates on a closed cycle and the other on an open cycle. Delivery temperatures on the order of 115 10 130/sup 0/C with a 60/sup 0/C source are possible, provided that advanced heat/mass transfer configurations are developed. The open-cycle concept is an interesting possibility for heat recovery. It can, in principle, operate with lower waste heat temperatures than a closed cycle, and during the heating season it may provide both process and space heat.
Authors:
Publication Date:
OSTI Identifier:
6505304
Report Number(s):
ORNL/TM-7655
DOE Contract Number:
W-7405-ENG-26
Resource Type:
Technical Report
Research Org:
Oak Ridge National Lab., TN (USA)
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 29 ENERGY PLANNING, POLICY AND ECONOMY; HEAT PUMPS; EFFICIENCY; THERMODYNAMIC CYCLES; WASTE HEAT UTILIZATION; INDUSTRY; WASTE HEAT; CLOSED-CYCLE SYSTEMS; HEAT RECOVERY; OPEN-CYCLE SYSTEMS; PERFORMANCE; ENERGY; ENERGY RECOVERY; HEAT; RECOVERY; WASTE PRODUCT UTILIZATION; WASTES 320304* -- Energy Conservation, Consumption, & Utilization-- Industrial & Agricultural Processes-- Waste Heat Recovery & Utilization; 290800 -- Energy Planning & Policy-- Heat Utilization-- (1980-)