This research effort involved experimentally testing an advanced-cycle, ammonia-water absorption chiller with a cooling capacity of 17.6 kW (5 refrigeration tons (RT)). The system was a generator-absorber heat exchange (GAX) cycle and was sized for residential and light commercial use, where very little absorption equipment is currently used. The components of the cycle were assembled with instrumentation, including flow meters, pressure transducers, and thermocouples. The findings of the research were cycle cooling load and coefficient of performance (COP), as well as many component heat duties and working fluid state points throughout the cycle. The COP of the chiller at essentially full load was measured at 0.68. A simulation of the GAX cycle was performed with a computer program that predicted the heat duties of each component and the cooling load of the cycle. The simulation of the GAX cycle and experimental testing compared closely. Existing market research shows that significant business opportunities exist for a GAX heat pump or chiller with a cooling COP of 0.70 or greater. The work performed in this study consisted of testing a GAX cycle with a COP that approached the target value of 0.70 and identified improvements that must be made to reach the target COP value.

Issue Section:
Technical Papers
Keywords:
building management systems, cooling, heat exchangers, heat pumps, refrigerators, simulation, testing, heat of adsorption
Topics:
Absorption, Cooling, Cycles, Design, Generators, Heat, Heat pumps, Stress, Temperature, Testing, Water, Simulation, Thermocouples, Heat exchangers, Pressure, Fluids, Refrigeration
1.
DeVault, R. C., 1988, “DOE Absorption Programs Overview,” Proc., 2nd DOE/ORNL Heat Pump Conference, pp. 104–109.
2.
Statt, T. G., 1988, “Advanced Refrigeration Systems Program Overview,” Proc., 2nd DOE/ORNL Heat Pump Conference, pp. 3–6.
3.
Columbia Gas Distribution Companies, 1993, “Double-Effect Absorption Gas Heat Pump—Residential and Commercial Prospectus,” Research Department, 1600 Dublin Rd., P.O. Box 2318, Columbus, OH, 43216.
4.
D’zurko
,
D. C.
, and
Epstein
,
G. J.
,
1996
, “
Comparative Analysis for Natural Gas Cooling and Space Conditioning Technologies in New York State
,”
ASHRAE Trans.
,
102
, No.
1
, pp.
275
–
283
.
5.
Phillips, B. A., 1990, “Development of a High-Efficiency, Gas Fired, Absorption Heat Pump for Residential and Small Commercial Applications: Phase I Final Report: Analysis of Advanced Cycles and Selection of the Preferred Cycle,” Final Report on Oak Ridge National Laboratory Subcontract 86X-24610C.
6.
Modahl, R. J. and Hayes, F. C., 1988, “Evaluation of a Commercial Advanced Absorption Heat Pump Breadboard,” Proc., 2nd DOE/ORNL Heat Pump Conference, pp. 117–125.
7.
Herold, K. E., Radermacher, R., and Klein, S. A., 1996, Absorption Chillers and Heat Pumps, CRC Press, Boca Raton, FL.
8.
Priedeman, D. K., 1997, “Testing of a Residential GAX Absorption Heat Pump and Chiller and Verification of a Computer Cycle Simulation,” Ph.D. dissertation, The Ohio State University, Columbus, OH.
9.
Beckwith, T. G., Buck, N. L., and Marangoni, R. D., 1982, Mechanical Measurements, Addison-Wesley, London, UK.
10.
Ozaki, E., Yumikura, T., and Tsujimori, A., 1995, “Performance of Residential Ammonia-Water Absorption Heat Pump,” ASME/JSME Thermal Engineering Conference, Vol. 4, pp. 607–612.
11.
Phillips, B. A., 1999, “Advances on Ammonia-Water Heat Pumps for Residential Use,” International Sorption Heat Pump Conference, Munich, Germany.
12.
Erickson, D. C., Anand, G., and Papar, R. A., 1996, “Branched GAX Cycle Gas Fired Heat Pump,” Proc., Intersociety Energy Conversion Engineering Conference, 2, pp. 1078–1083.
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