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What is the value of power required to drive the systems in the following diagram?

What is the value of power required to drive the systems in the following diagram? Correct Answer m1 (h2 – h1) + m2 (h6 – h5) kW

Power required to drive the system is the power required to do the work using compressors. Work = mass of refrigerant flowing through the compressor x change of enthalpy Work done by low-temperature cascade system = m1 (h2 – h1) Work done by high-temperature cascade system = m2 (h6 – h5) Total work = Work done by low-temperature cascade system + Work done by high-temperature cascade system Total work done = m1 (h2 – h1) + m2 (h6 – h5) kJ/min Power required = Work done / 60 = m1 (h2 – h1) + m2 (h6 – h5) kW.

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