On solar absorption refrigerator's performances

Solar absorption refrigerator's performances are analysed by a conceptual optimization. The simulation is based on hierarchical decomposition, on the principles of the endoreversibility, respectively of the exoreversibility of the solar absorption refrigerators. Optimization is carried out by adopting the method of Lagrange multipliers. This methodology was been applied to absorption cycle composed of a solar concentrator (hot source), a thermal solar converter (thermal engine 1), an intermediate source, a cold source and four main elements: a generator, an absorber, acondenser and an evaporator. The generator and the absorber constitute a thermal engine ET2 and the whole condenser evaporator forms the thermal receptor RT. The parameterization of the installation comprises fluxes and powers and the temperatures that reign in the thermal machine compartments. This made it possible to get out two equation systems which guarantee the coupling of general optimal performance characteristics of a simple effect solar absorption cycle. The functional and conceptual characteristics are studied. In particular, the effect of the external sources temperatures on the performances is discussed. These results are interesting in absorption machine’s conception viewpoint. They encourage studies in an irreversible way.