Abstract
In this paper, we present a numerical study of a single-stage absorption refrigeration machine, operating with a couple of water-ammonia fluids, equipped with a distillation column and associated with a solar heating system using solar collectors. The study has showed the benefit of using the distillation column which is manifested by: The decrease of the operating temperature, The improvement of the coefficient of performance, Surface reduction of the solar collectors, The improvement of the solar coefficient of performance. The solar study shows that the absorption refrigeration machine equipped with a distillation column is better suited to solar energy with significantly better performance compared to the simple absorption refrigeration machine.
Highlights
Environmental pollution and the energy crisis have led in recent years to many studies on the rational use of energy[1]
Energetic and enthalpic balances on various machine components and operational hypotheses, we find the expression of the heat flux at the levels of the different organs of the machine[22]: Table 1.The heat flows of the various units of the single stage absorption refrigeration machine with distillation column
By determining the thermodynamic properties of the water-ammonia fluid pair, the method is based on equilibrium quantities, determined using the Peng-Robinson state equation, and the specific volume, entropy and enthalpy at each point of the machine cycle is calculated from the analytical expression of the Gibbs free energy given by Ziegler, The high and the low pressure are calculated by the formula of Antoine, we can determine the coefficient of performance (COP) of the refrigeration machine with absorption[23-29]
Summary
Environmental pollution and the energy crisis have led in recent years to many studies on the rational use of energy[1]. The main components of the solar absorption refrigeration machine are solar thermal collector, an evaporator, an absorber, generator, distillation column, https://doi.org/10.1051/ e3sconf/202015 0 010 0 9 a condenser, an expansion valve, a heat exchanger and a pump. Two kinds of working medium are used at the same time in refrigeration and absorption processes In this machine the solar thermal collector collects heat by absorbing sunlight. By determining the thermodynamic properties (temperature, pressure, composition, enthalpy, entropy, specific volume, vapor and liquid titre) of the water-ammonia fluid pair, the method is based on equilibrium quantities (temperature, pressure, composition), determined using the Peng-Robinson state equation , and the specific volume, entropy and enthalpy at each point of the machine cycle is calculated from the analytical expression of the Gibbs free energy given by Ziegler, The high and the low pressure are calculated by the formula of Antoine , we can determine the coefficient of performance (COP) of the refrigeration machine with absorption[23-29]. The overall COPS of the solar absorption refrigeration is equal to the product of the efficiency of the solar collector and the absorption refrigeration given equation [30]
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