ENGINEERING FUNDAMENTALS
ENGINEERING FUNDAMENTALS
6th Edition
ISBN: 9781337705011
Author: MOAVENI
Publisher: CENGAGE L
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Chapter 13, Problem 26P

(a)

To determine

Find the amount of natural gas needed to burn to heat twenty gallons of water, if the water heater has an efficiency of 78%.

(b)

To determine

Find the amount of natural gas needed to burn to heat twenty gallons of water, if the water heater has an efficiency of 85%.

(c)

To determine

Find the amount of natural gas needed to burn to heat twenty gallons of water, if the water heater has an efficiency of 90%.

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A heat pump supplies heat energy to a house at the rate of 140,000 kJ/h when the house is maintained at 25°C. Over a period of one month, the heat pump operates for 100 hours to transfer energy from a heat source outside the house to inside the house. Consider a heat pump receiving heat from two different outside energy sources. In one application the heat pump receives heat from the outside air at 0°C. In a second application the heat pump receives heat from a lake having a water temperature of 10°C. If electricity costs $0.105/kWh, determine the maximum money saved by using the lake water rather than the outside air as the outside energy source.
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