Cycle and performance analysis of absorption heat pumps for waste heat utilization
This report describes a theoretical analysis of a double-stage absorption heat pump cycle, performed as the first step toward the construction of a laboratory working system. The heat pump designed to upgrade low-temperature waste heat by boosting its temperature typically from 60/sup 0/C (140/sup 0/F) to 120/sup 0/C (250/sup 0/F). The heat, whih may be available from a variety of sources, is thereby made useful for industrial and other applications. The system uses part of the low-temperature heat as its energy source and does not need outside power, except for running small auxiliary equipment. The heat pump employs an desorber/evaporator combination in which some hot water from the heat source is evaporated and the vapor is absorbed in a concentrated absorbent solution. The heat of absorption serves to raise the temperature of the rest of the hot water stream. Two stages of the above system are used in series to provide the desired temperature boost. Both are served by one desorber which uses part of the waste heat to concentrate the solution. The study considers both open- and closed-cycle regeneration of the solution. The report describes the operation of the system and defines its performance criteria. Results of a computer study show the variation in performance with different design variables. Two working materials, LiBr-water and LiCl-water, are considered. The effect of different operating conditions is evaluated.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6168794
- Report Number(s):
- ORNL/TM-7852; ON: DE81030705
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HEAT PUMPS
PERFORMANCE
WASTE HEAT UTILIZATION
BENCH-SCALE EXPERIMENTS
CLOSED-CYCLE SYSTEMS
EVAPORATION
HEAT RECOVERY
HOT WATER
LITHIUM BROMIDES
LITHIUM CHLORIDES
OPEN-CYCLE SYSTEMS
OPERATION
SYSTEMS ANALYSIS
WATER
WORKING FLUIDS
ALKALI METAL COMPOUNDS
BROMIDES
BROMINE COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
ENERGY RECOVERY
FLUIDS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
LITHIUM COMPOUNDS
LITHIUM HALIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RECOVERY
WASTE PRODUCT UTILIZATION
320304* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Waste Heat Recovery & Utilization