Dimensionamento e seleção de equipamentos para um sistema de acondicionamento e refrigeração de frutas e carnes

Abstract

Refrigeration and air conditioning allow, through the storage method, an extension in the life of alimentary products in places with adverse climates. This work constitutes the design and of a cold room that should be installed in Belém-PA, responsible for the packaging and refrigeration of apple and pork respectively. The project consists in the calculation of the thermal load and the specifications of the equipment necessary for the operation of a cold chamber. In this work, we specified the factors that influenced the development of the project and the equipment’s principle of operation. The designed system uses the steam mechanical compression cooling cycle with the R-404a refrigerant. The cold storage chamber in question has a capacity to cool five tonnes of apple (at a temperature of 0 °C) and freeze ten tonnes of pork (at a temperature of -5.5 °C) daily. All calculation of the project, was based on the current technical standards of ASHRAE (American Society of Heating, Refrigerating and AirConditioning Engineers), aiming at equipment that offers safety to its operators, consumers and a good economic condition of operation. For the physical space, the expanded polyurethane was used as insulating material, with a thickness of 100 mm. The results obtained indicate that the largest portion of thermal load involved in the project would be related to the products, reaching 21.77 kW for apples and 137.7kW for pork, which means 97% of the total value of the total thermal load. The results indicate that the projected system should promote a heat removal of 736,7 BTU/h from the internal space, using three evaporators and five condensing units.