HEATING, VENTILATING,+AC ANAL...EBOOK>I<
HEATING, VENTILATING,+AC ANAL...EBOOK>I<
6th Edition
ISBN: 2819480255750
Author: Mcquiston
Publisher: INTER WILE
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Chapter 1, Problem 1.6P

For the business whose monthly electrical energy use in described in Problem 1-5, estimate the average rate of energy use in kw, assuming it uses energy only from 7:00 A.M. to 6:00 P.M., Monday through Friday in a 31-day month. Assume that the month starts on a Monday to give 22 working days that month. Calculate the ratio of the peak demand set during that month to the average rate of energy use. What reasons would likely cause the ratio to be high?

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An electric hot water heater consumes 3.1 kilowatts of electricity and converts it to heat. How long will it take the water heater to heat a 67 gallon tank of water from 10 degrees Celsius to 50 degrees Celsius? (1 kilogram of water is 0.37 gallons, 1 Calorie = 4200 J).  It may be helpful to refer back to the weekly handout for guidance on this problem. Your final answer should be in minutes (rounded to the nearest 10 minutes).
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1.5. A refrigerator is used to cool 4 litres of soft drink from room temperature (25 °C) to 3 °C. If the density of the soft drink is 1015 kg/m3 (1 litre = 0.001 m³), how much heat must be removed if the specific heat of the soft drink is 4350 J/kg °C. 1.6. An engine operating in a cycle absorbs 5000 cal of the heat from a heat source and performs 2000 cal of work. Calculate: (a) The amount of heat discarded in this cycle (b) The efficiency of the engine

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