Refrigerant 134a initially at -36 C fills a rigid vessel. The refrigerant is heated until the temperature becomes 25 C and the pressure is 1 bar. There is no work during the process. For the refrigerant, determine the heat treansfer per unit mass and the change in specific exergy.

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature