(a) What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 60.0°C and a cold reservoir temperature of -22.0°C? (b) How much heat transfer (in kcal) occurs into the warm environment if 3.60 ✕ 107 J of work (10.0 kW · h) is put into it? _______kcal (c) If the cost of this work input is 10¢/kW · h, how does its cost compare with the direct heat transfer achieved by burning natural gas at a cost of 87.0 cents per therm. (A therm is a common unit of energy for natural gas and equals 1.055 ✕ 108 J.) cost of heat pump cost of natural gas
(a) What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 60.0°C and a cold reservoir temperature of -22.0°C? (b) How much heat transfer (in kcal) occurs into the warm environment if 3.60 ✕ 107 J of work (10.0 kW · h) is put into it? _______kcal (c) If the cost of this work input is 10¢/kW · h, how does its cost compare with the direct heat transfer achieved by burning natural gas at a cost of 87.0 cents per therm. (A therm is a common unit of energy for natural gas and equals 1.055 ✕ 108 J.) cost of heat pump cost of natural gas
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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(a) What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 60.0°C and a cold reservoir temperature of -22.0°C?
(b) How much
_______kcal
(c) If the cost of this work input is 10¢/kW · h, how does its cost compare with the direct heat transfer achieved by burning natural gas at a cost of 87.0 cents per therm. (A therm is a common unit of energy for natural gas and equals 1.055 ✕ 108 J.)
cost of heat pump |
cost of natural gas |
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