Solved: A process requires a heat transfer rate of 3 × 106
Chapter 10, Problem 39P(choose chapter or problem)
A process requires a heat transfer rate of 3 3 106 Btu/h at 1708F. It is proposed that a Refrigerant 134a vapor-compression heat pump be used to develop the process heating using a wastewater stream at \(125^{\circ} \mathrm{F}\) as the lower temperature source. Figure P10.39 provides data for this cycle operating at steady state. The compressor isentropic efficiency is 80%. Sketch the T–s diagram for the cycle and determine the
(a) specific enthalpy at the compressor exit, in Btu/lb.
(b) temperatures at each of the principal states, in \({ }^{\circ} \mathrm{F}\).
(c) mass flow rate of the refrigerant, in lb/h.
(d) compressor power, in Btu/h.
(e) coefficient of performance and compare with the coefficient of performance for a Carnot heat pump cycle operating between reservoirs at the process temperature and the wastewater temperature, respectively.
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