Diseño y construcción de un equipo para la evaluación de las propiedades térmicas de transporte en el proceso de evaporación con refrigerante R600a y aceite miscible PAO en concentraciones de hasta 5%

Abstract

This final project focuses on the design and construction of an equipment to evaluate the thermal properties of the transporting issues that are involved in the evaporation process with a refrigerant type R600a and miscible or polyalphaolefin oil, PAO, up to 5 percent of concentration; the thermodynamic study is based on the refrigeration cycle by vapor compression, using some equipment for its construction, such as a reciprocating compressor with 169 W cooling capacity and 1/6 hp, also a condenser and evaporator of 589 W performance and a copper pipe type k with diameters of 3/8in. and 1/4in.The results have been tabulated throughout this paper on different sections, and with the support of EES software (Engineering Equation Solver) the 4 most influential points on the refrigeration process on vapor compression were found, and they reflect the most influential pressure and temperatures on the entire system. The critical temperatures to consider on the condenser and also on the evaporator, were 30 °C and -20 °C. The first step to run the equipment is to load inside the refrigeration system, the R660a refrigerant as saturated steam at the compressor inlet and then it must be left as overheated steam, which placed at the inlet of the condenser is released as saturated liquid. Then the capillary pipe works leaving wet steam and finally it is returned to its initial condition. All of this process happens with the preliminary study about heat transfer by adding the miscible oil PAO to the mixture on different percentages of concentrations up to 5 percent.