Answered: In the heating mode a heat pump has a…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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In the heating mode a heat pump has a COP = 4.45. a) Determine the COP if the heat pump were operating in the cooling mode. Assume that all parts of heat pump remain at constant temperature and that there is no heat exchange with the environment. b) For the heat pump operating in the cooling mode at a power level of 1.75 kW, how much time would be required to freeze 1.25 kg of water at 22.0 ° C to ice at 0 ° C? c) Calculate the change in entropy of the water. d) Does the calculated result for part c call into question the assumptions concerning heat pump parts and the environment? Explain your answer. C_w = 4.19 x 10³ J/kg °C L_f = 3.33 x 10⁵ J/kg

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