As shown in Fig. P 5.73, a heat pump receives energy by
Chapter 5, Problem 5.73(choose chapter or problem)
As shown in Fig. P 5.73, a heat pump receives energy by heat transfer from below Earth’s surface where the temperature is \(50^{\circ} \mathrm{F}\) and delivers energy by heat transfer to ammonia vaporizing from saturated liquid to saturated vapor at \(75^{\circ} \mathrm{F}\). These are the only significant heat transfer. At steady state, the power input to the heat pump is 3 hp. Determine the maximum theoretical ammonia mass flow rate, in lb/min, for any such heat pump. For the ammonia ignore kinetic and potential energy effects.
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