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In a vapour compression refrigeration plant, the refrigerant leaves the evaporator at 195 kJ/kg and the condenser at 65 kJ/kg. For 1 kg/s of refrigerant, the refrigeration effect is ___________ kW.
    Correct answer is '130'. Can you explain this answer?
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    Explanation:

    • The refrigeration effect is the amount of heat removed from the refrigerated space.

    • The refrigerant leaves the evaporator at 195 kJ/kg and the condenser at 65 kJ/kg, which means that the refrigerant has given up 195-65 = 130 kJ/kg of heat to the surroundings.

    • For 1 kg/s of refrigerant, the refrigeration effect can be calculated as:


      • Refrigeration effect = Mass flow rate x Heat removed per unit mass

      • Heat removed per unit mass = (195 - 65) kJ/kg = 130 kJ/kg

      • Mass flow rate = 1 kg/s

      • Refrigeration effect = 1 x 130 = 130 kW


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