Answer Happy

15.41-Applications of Thermodynamics: Heat Pumps and Refrigerators Part A What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 51.0°C and a cold reservoir temperature of -9.0°C. 5.40 You are correct. Your receipt no. is 164-345 (7) Previous Tries Part B How much heat transfer occurs into the warm environment if 5.04x107 J of work (14.0 kW-h) is put into it? 2.72×108 J You are correct. Your receipt no. is 164-1828 Previous Tries Part C If the cost of this work input is 11.1 cents/kW-h, how much does its cost (in $) if operated using electric power? (You do not need to enter any units.) $1.33 Submit Answer Incorrect. Tries 1/10 Previous Tries 'H Part D How does the cost (in $) compare with the direct heat transfer achieved by burning natural gas at a cost of 74.0 cents per therm? (A therm is a common unit of energy for natural gas and equals 1.055x108 J.) (You do not need to enter any units.) $0.354 Submit Answer Incorrect. Tries 2/10 Previous Tries