A piston-cylinder device contains 15 kg of Refrigerant-l 34a (R-134a) at 10 °C with 30% quality. Heat is transferred to the R-134a until the pressure is 800 kPa and temperature is 115 °C. (i) Determine of work involved in this process (kJ) and calculate the heat transfer during the process (kJ). b) A rigid tank (0.5 m3) contains Refrigerant-134a (R-134a) at 18 °C with 40% quality. The tank is connected through a valve to a supply line that carries R-134a at 1.6 MPa and 1 00°C. The R-134a in the supply line enters the tank when the valve is opened until the pressure in the tank is 1.4 MPa and the entire R-134a in the tank exists in the vapor phase only. Determine the heat transfer between the system and surroundings (kJ).

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Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.