An electric water heater held at 140 °F is kept in a 70 °F room. When purchased, its insulation is equivalent to R-7. An owner puts a 25 ft² blanked on the water heater, raising its total R value to 18 ft²-°F-hr/Btu. Assuming 100 percent conversion of electricity into heated water, how much energy (kWh) will be saved each year? If electricity costs 13.0 cents/kWh, how much money will be saved in energy costs each year?

An electric water heater held at 140 °F is kept in a 70 °F room. When purchased, its insulation is equivalent to R-7. An owner puts a 25 ft² blanked on the water heater, raising its total R value to 18 ft²-°F-hr/Btu. Assuming 100 percent conversion of electricity into heated water, how much energy (kWh) will be saved each year? If electricity costs 13.0 cents/kWh, how much money will be saved in energy costs each year?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

Problem 1.30 (modified), Masters and Ela, Introduction to Environmental Engineering and
Science, 3rd Ed.:
An electric water heater held at 140 °F is kept in a 70 °F room. When purchased, its
insulation is equivalent to R-7. An owner puts a 25 ft² blanked on the water heater, raising its
total R value to 18 ft²-°F-hr/Btu. Assuming 100 percent conversion of electricity into heated
water, how much energy (kWh) will be saved each year? If electricity costs 13.0 cents/kWh,
how much money will be saved in energy costs each year?

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