Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)
5th Edition
ISBN: 9781305084766
Author: Saeed Moaveni
Publisher: Cengage Learning
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Chapter 12, Problem 29P
To determine
Find the efficacy of the
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Determine the luminous efficacy of the following lamps having comparable illumination outputs:a. A 300 W incandescent lamp that emits 5820 lmb. Two 32 W linear fluorescent lamps that emit 2950 lm per lamp in a luminaire that consumes 70 W including the ballastsc. A 70 W metal halide lamp that consumes 88 W, including the ballast and emits 5500 lm
Assume 40% of the light emitted by a 1000 W metal halide lamp (110,000 lm) illuminates a surface with the area of a 32-ft diameter.
1. Determine the average illuminance of the surface in foot candles.
2. Determine the average illuminance of the surface in lux.
Replacing incandescent lights with energy-efficient fluorescent lights can reduce the lighting energy consumption to one-fourth of what it was before. The energy consumed by the lamps is eventually converted to heat, and thus switching to energy-efficient lighting also reduces the cooling load in summer but increases the heating load in winter. Consider a building that is heated by a natural gas furnace with an efficiency of 80 percent and cooled by an air conditioner with a COP of 3.5. If electricity costs $0.12/kWh and natural gas costs $1.40/therm (1 therm = 105,500 kJ), determine if efficient lighting will increase or decrease the total energy cost of the building (a) in summer and (b) in winter.
Chapter 12 Solutions
Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)
Ch. 12.1 - In what unit is electric current measured?Ch. 12.1 - Prob. 2BYGCh. 12.1 - Prob. 3BYGCh. 12.1 - Prob. 4BYGCh. 12.1 - Prob. 5BYGCh. 12.1 - Prob. 6BYGCh. 12.1 - Prob. BYGVCh. 12.2 - Prob. 1BYGCh. 12.2 - Prob. 2BYGCh. 12.2 - Prob. 3BYG
Ch. 12.2 - Prob. 4BYGCh. 12.2 - Prob. 5BYGCh. 12.2 - Prob. 6BYGCh. 12.2 - VocabularyState the meaning of the following...Ch. 12.4 - Prob. 1BYGCh. 12.4 - Prob. 2BYGCh. 12.4 - Prob. 3BYGCh. 12.4 - Prob. 4BYGCh. 12.4 - Prob. 5BYGCh. 12.4 - Prob. 6BYGCh. 12.4 - Prob. BYGVCh. 12 - Prob. 1PCh. 12 - Prob. 2PCh. 12 - Prob. 3PCh. 12 - Prob. 6PCh. 12 - Prob. 8PCh. 12 - Prob. 9PCh. 12 - Prob. 10PCh. 12 - Prob. 16PCh. 12 - Prob. 18PCh. 12 - Prob. 19PCh. 12 - Prob. 20PCh. 12 - Prob. 21PCh. 12 - Prob. 23PCh. 12 - Prob. 24PCh. 12 - As you know, a fuse is a safety device that is...Ch. 12 - Prob. 27PCh. 12 - Prob. 28PCh. 12 - Prob. 29PCh. 12 - Prob. 30PCh. 12 - Prob. 31P
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