Heating Ventilating and Air Conditioning: Analysis and Design
Heating Ventilating and Air Conditioning: Analysis and Design
6th Edition
ISBN: 9780471470151
Author: Faye C. McQuiston, Jeffrey D. Spitler, Jerald D. Parker
Publisher: Wiley, John & Sons, Incorporated
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Chapter 1, Problem 1.23P

A Btu-meter is a device that measures water flow rate and the temperature difference between the water entering and leaving the property of an energy customer. Over time the device measures and reads out the amount of energy used. Water enters the property at 140 F and leaves at 120 F and the total flow rate through the meter for a month is 900,000 gallons. What would be the monthly energy bill if the charge for energy is 25 cents per million Btu?

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1. Is it Worth IT? I am considering purchasing a cover for my swimming pool. I have estimated that my pool loses 1.5 in of water off of its 1200 ft² surface each week due to evaporation. The cost of energy to heat the pool averages about $10.00 per million Btu. Interestingly, the salesperson at the pool store claims that a $500 pool cover will reduce evaporative losses by two-thirds and, as such, will pay for itself in one 15-week swimming season. Is it worth it for me to purchase this pool cover? You can assume that the heat of vaporization for water at my pool's average temperature equals 1050 Btu/lb.

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Heating Ventilating and Air Conditioning: Analysis and Design

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