ALBUQUERQUE, C. E. S.; http://lattes.cnpq.br/8992979700963039; ALBUQUERQUE, Carlos Eduardo da Silva.
Abstract:
This research presents energetic and exergetic analysis of a water refrigeration
unit, called Chiller. The Chiller under study performs the thermodynamic cycle of the
refrigeration with the assistance of a mechanical compressor, usually triggered by an
electric motor, in order to increase the pressure in a certain stage on the
thermodynamic cycle of the system, which generates high energy consumption.
However, with the advance of the technology, every day emergs new types of
compressors that have lowest energy consumption and improves the performance of
the unit as a whole. The purpose of this work is to evaluate both e nergetic and
exergetic behavior, of a chiller that provides cold water and works with a screw type
compressor, based on the first and second laws of thermodynamics . This study was
based on the actual behavior of a steam compression chiller from a mall in the city of
João Pessoa-PB. Through numerical simulation, it was possible to evaluate the
behavior of the equipment with the change of some of the normal parameters of
work, as condensation and evaporation pressures, condensation and evaporation
temperature and refrigerant fluid. In this study, the performance of the equipment
data is presented as a function of the evaporator and compressor pressures, the
evaporation temperature and other parameters. The results of the simulations, that
were realized with support of software EES, showed that the unit performance was
improved by decreasing the pressure variation between condenser and the
evaporator and also has proved that the energetic and exergetic efficiences are
increased by raising the evaporation temperature and a reduction happens by
increasing the condensation temperature.
