Studying optimal generator temperature of single effect NH3-H2O absorption refrigeration machine for ice-making

This paper present the coefficient of performance analysis of a NH3-H2O absorption refrigeration machine with the heat supply 3.76kW, cooling the 23% NaCl solution from the ambient temperature 30°C to -18°C. The working machine is controlled according to the different flow rates of the weak solution supplying the absorber. The fluctuation of the cooling capacity according to the NH3 refrigerant throttling to the evaporator which is observed. The absorption refrigeration machine simulation program is established for testing and evaluating the experimental data again to ensure the absorption refrigeration machine working correctly to the initial design. The operating temperature simulations of the machine are compared with other studies, the deviation are from 2 to 7% at the optimal coefficient of performance. Base on this basis, the correlation of optimal generation temperature with condensation, absorption and evaporation temperatures of the machine components are set into an equation presented in this paper.