To determine Whether the power required by the heat pump at steady state is 35 kW . Explanation Write the expression for heat supplied. Q H = m ˙ ( h g − h f ) (I) Here, heat supplied is Q H , mass flow rate is m ˙ , enthalpy of saturated liquid is h f and enthalpy of saturated vapor is h g . Write the expression for actual coefficient of performance. β = Q H W . (II) Here, power input is W , heat supplied is Q H and the coefficient of performance of the heat pump is β . Write the expression for maximum coefficient of performance. β max = T H T H − T C (III) Here, saturation temperature is T H , temperature of cold reservoir is T L and the maximum coefficient of performance is β max . Conclusion: Refer to Table A-3, “Properties of saturated water (Liquid-Vapor): Pressure Table” to obtain the value of enthalpy of saturate liquid at pressure of 2 bar as 504.7 kJ / kg and h f g as 2070 kJ / kg . Substitute 504.7 kJ / kg for h f , 2070 kJ / kg for h f g and 0.05 kg / s for m ˙ in Equation (I). Q H = ( 0.05 kg / s ) ( 2707 − 504.7 ) kJ / kg = ( 0

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Chapter 5.11, Problem 72P

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Whether the power required by the heat pump at steady state is 35 kW.

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Chapter 5.11, Problem 71P

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