Analysis of Ammonia-Water (NH3-H2O) Vapor Absorption Refrigeration System based on First Law of Thermodynamics
Full Text(PDF, 3000) PP.
| Author(s) |
|Satish Raghuvanshi, Govind Maheshwari|
| KEYWORDS |
Energy, Energy Rate, Coefficient of Performance
The continuous increase in the cost and demand for energy has led to more research and development to utilize available energy resources efficiently by minimizing waste energy. Absorption refrigeration systems increasingly attract research interests. Absorption cooling offers the possibility of using heat to provide cooling. For this purpose heat from conventional boiler can be used or waste heat and solar energy. Absorption system falls into two categories depending upon the working fluid. These are the LiBr-H2O and NH3-H2O Absorption Refrigeration system. In LiBr-H2O system water is used as a refrigerant and LiBr is used as an absorbent, while in NH3-H2O system ammonia used as an refrigerant and water is used as an absorbent, which served as standard for comparison in studying and developing new cycles and new absorbent/refrigerant pairs. The objective of this paper is to present empirical relations for evaluating the characteristics and performance of a single stage Ammonia water (NH3-H2O) vapour absorption system. The necessary heat and mass transfer equations and appropriate equations describing the thermodynamic properties of the working fluid at all thermodynamic states are evaluated. An energy analysis of each component has been carried out and numerical results for the cycle are tabulated. Finally the variations of various thermodynamic parameters are simulated and examined.
 N.Bennani, M.Prevost and A.Coronas. 1989.Absorption heat
pump cycle: Performance analysis of water-glycerolmixture. Heat
Recovery System &CHP.9(3):257-263.
 P.Bourseau and R.Bugarel. 1986. Absorption-diffusion machines:
comparison of performances of NH3-H2O and NH3-NaSCN.
Int.J.Refrig. Vol. 206-214.
 D.Butz and K.Stephan. 1989. Dynamic behavior of an absorption
heat pump. Int.J.Refrig.Vol.12:204-212.
 M.A.R. Eisa and F.A.Holland. 1986. A study of the performance
parameter in a water-lithium bromide absorption cooler. Energy Res.
 Da-Wen Sun Thermodynamic design Data and optimum design
maps for absorption refrigeration system. Received 5 august
1996, Vol.17 No.3.pp 211, 1997
 Xu GP, Dai YQ. Theoretical analysis and optimization of a
double-effect parallel flow type absorption chiller. Applied Thermal
Engineering 1997; 17(2):157–170.
 K. Stephan, History of absorption heat pumps and working pair
developments in Europe, Int. J Refrig.6 160-166.