Dimensionamento de um dispositivo de expansão tubo em U, para redução de pressão, de um sistema de refrigeração por absorção de duplo efeito em série do par água-brometo de lítio

Abstract

The present work is focused on the study of the expansion devices, of the U-tube type, used in the vapor-absorption refrigeration systems of the water-lithium bromide pair. Based on the parameters established for the system, dimensioning a U-tube type expansion device, in order to reduce the pressure of the refrigerant and the solution to the lower pressure levels of the system. The parameters used are based on the referenced bibliographies and a pilot unit of a dual-effect absorption refrigeration system in series of the water-lithium bromide pair, present in the laboratory of the RECOGÁS in the UFPB. The design is aimed at replacing an expansion device, previously used with a capillary tube, and short holes, to solve problems with obstruction of the passage of the fluid. The losses of loads to be provided should generate the same pressure conditions of the outputs of the capillary tube previously employed. The lengths of the U-tubes are obtained using the Bernoulli equation between the specified pressure vessels. These absorption refrigeration systems have their use for human comfort as well as food preservation in perishable products. And it has the advantage of being able to use thermal waste from different sources for its operation.