Problem 3: Refrigerant-134a is throttled from 10 bar and 36 o C to 240 kPa. Heat is lost from the refrigerant in the amount of 1 kJ/kg to the surroundings. Determine the exit temperature of the refrigerant. Assume steady state and ignore kinetic and potential energy effects.

Explanation:

By applying the First Law of Thermodynamics, the model for the throttle valve is:

The specific enthalpy at outlet is:

The state of the refrigerant 134a at inlet is a subcooled liquid. Then, specific enthalpy is:

The specific enthalpy at outlet is:

The substance at outlet is a liquid-vapor mixture. Then, exit temperature is:

answer:

d. attempt to find the owner, then leave your information if you cannot find them.

explanation:

d. represents both (b) and (c).

more logical as well.

b and c are to complicated.

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