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Prof. Dr. Arlindo Tribess Escola Politécnica da Universidade de São Paulo Departamento de Engenharia Mecânica Av. Prof. Mello Moraes 2231 05508-900 São Paulo, SP Brasil e-mail: atribess@usp.br Abstract Human being spends a large amount of energy to satisfy its comfort needs. In the automotive applications, air conditioning is the second larger energy consumption system, after the mobility system itself. The refrigeration system for automotive application has peculiar characteristics, which are different from other refrigeration systems. In an automotive application, variation of several conditions are highly significant, so the system must be designed to operate satisfactorily under all these conditions and to provide thermal comfort with smallest possible energy consumption. The objective of this work is to present the project of a refrigeration cycle for a compact size vehicle in order to meet thermal load requirements of a specific wind tunnel test. The project includes the sizing of main components of a refrigeration cycle such as compressor, condenser, evaporator and expansion device. The refrigeration cycle is designed by following a design procedure, in order to meet the calculated thermal load. The performance of the refrigeration cycle is evaluated with the use of a proposed simulation procedure, and the results are compared with the actual vehicle test results. The results achieved with the proposed simulation model are acceptable. The model can be used to predict the impact of a modification in the refrigeration cycle such as a component change, or even to predict the system balance point under different operating conditions.

Dimensionamento e avaliação do ciclo de refrigeração de sistema de climatização automotivo.