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31 March, 01:37

Refrigerant-134a is throttled from the saturated liquid state at 800 kPa to a pressure of 140 kPa. Determine the temperature drop during this process and the final specific volume of the refrigerant.

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  1. 31 March, 04:19
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    The temperature drop is 61.1 °C

    The final specific volume of the refrigerant is 1.236 m^3/kg

    Explanation:

    Initial pressure of refrigerant = 800 kPa = 800/100 = 8 bar

    Final pressure of refrigerant = 140 kPa = 140/100 = 1.4 bar

    From steam table

    At 8 bar, initial saturated temperature is 170.4 °C

    At 1.4 bar, final saturated temperature is 109.3 °C

    Temperature drop = initial saturated temperature - final saturated temperature = 170.4 - 109.3 = 61.1 °C

    Also, from steam table

    At 1.4 bar, specific volume is 1.236 m^3/kg

    Final specific volume of the refrigerant is 1.236 m^3/kg
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