Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-06-03T23:57:09Z No. of bitstreams: 1 BrunoDanielAlvesDoNascimento_DISSERT.pdf: 2697025 bytes, checksum: 8a93610daedd22a97964b68f4766a99b (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-06-07T20:32:39Z (GMT) No. of bitstreams: 1 BrunoDanielAlvesDoNascimento_DISSERT.pdf: 2697025 bytes, checksum: 8a93610daedd22a97964b68f4766a99b (MD5) / Made available in DSpace on 2016-06-07T20:32:39Z (GMT). No. of bitstreams: 1 BrunoDanielAlvesDoNascimento_DISSERT.pdf: 2697025 bytes, checksum: 8a93610daedd22a97964b68f4766a99b (MD5) Previous issue date: 2015-06-19 / A redu??o no consumo de energia ? o principal requisito a ser satisfeito em sistemas de refrigera??o e condicionamento de ar por compress?o mec?nica de vapor. Em sistemas automotivos essa realidade n?o ? diferente. A an?lise t?rmica nesses sistemas ? de fundamental import?ncia para um bom desempenho do ar-condicionado veicular. Este trabalho tem o objetivo de avaliar as condi??es de utiliza??o do g?s refrigerante R134a (utilizado em ve?culos automotivos), variando a velocidade no eletroventilador do evaporador, comparando a performance do mesmo com o g?s R437a, submetido as mesmas condi??es. Todos os testes foram realizados na unidade de climatiza??o automotiva ATR600, que simula as condi??es t?rmicas do sistema e do habit?culo do ve?culo. O equipamento est? instrumentado para aquisi??o dos dados de temperatura, press?es de alta e baixa e pot?ncia el?trica consumida, para determina??o do coeficiente de performance do ciclo. O sistema foi ensaiado nas rota??es de 800, 1600 e 2400 RPM com carga constante de R134a / R437a, recomendada pelo fabricante. Os resultados mostram que a melhor performance do sistema ocorre na rota??o de 800 RPM para ambos os refrigerantes. / The reduction in energy consumption is the main requirement to be satisfied in refrigeration and air conditioning by mechanical vapor compression system. In automotive system isn?t different. Thermal analyses in these systems are crucial for a better performance in automotive air conditioner. This work aims to evaluate the conditions of use of R134A refrigerant (used in vehicles) and compare with R437A (alternative refrigerant), varying the speed of the electric fan in the evaporator. All tests were performed in automotive air conditioning unit ATR600, simulating the thermal conditions of the system. The equipment is instrumented for data acquisition temperature, condensation and evaporation pressures and electrical power consumed to determine the coefficient of performance of the cycle. The system was tested under rotations of 800, 1600 and 2400 rpm with constant load of R- 134a. It occurred with the same conditions with R437A. Both recommended by the manufacturer. The results show that the best system performance occurs in the rotation of 800 RPM for both refrigerants.