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What is the value of work done in the following diagram?

What is the value of work done in the following diagram? Correct Answer m1 (h2 – h1) + m2 (h6 – h5)

Work done is across the 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).

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