Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)
5th Edition
ISBN: 9781305084766
Author: Saeed Moaveni
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 12, Problem 31P
To determine
Which light is efficient one for running at 4 hours per day for 300 days.
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
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.
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.
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
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- A box in a certain supply room contains three 40-W lightbulbs, five 60-W bulbs, and six 75-W bulbs. Suppose that three bulbs are randomly selected. a) What is the probability that exactly three of the selected bulbs are rated 75-W? b) What is the probability that all three of the selected bulbs have the same rating? c) What is the probability that one bulb of each type is selected? d) Suppose now that bulbs are to be selected one by one until a 75 W bulb is found. What is the probability that it is necessary to examine at least six bulbs?arrow_forwardThe lifetime of a lightbulb in a certain application is normally distributed with mean μ = 1400 hours and standard deviation σ = 200 hours. a.What is the probability that a lightbulb will last more than 1800 hours? b.Find the 10th percentile of the lifetimes. c.A particular lightbulb lasts 1645 hours. What percentile is its lifetime on? d.What is the probability that the lifetime of a lightbulb is between 1350 and 1550 hours?arrow_forwardYou are considering purchasing a compact washing machine, and you have the following information: • The Energy Guide claims an estimated yearly electricity use of 350 kW-hrs, based on 8 loads of laundry being washed per week. • The Energy Guide claims an estimated yearly operating cost of $38. This estimate is based on $0.1065 per kW-hr, and eight loads of laundry being washed per week. • Local electricity costs $0.086 per kW-hr. • You wash four loads of laundry per week. Based on this information, first calculate the energy that would be used by this compact washing machine in a year. Then calculate the yearly energy cost. $3.27 $15.34 $19.00 $178.40arrow_forward
- A stove element draws 15 A when connected to a 240-V line. How long does it take to consume 60 kJ .arrow_forwardAn ESP is to he designed to treat 9000 m3/min of gas to remove particles at 99.8% efficiency. Using Figure 5.10, estimate the required corona power in kW.arrow_forwardComplete the following sentences (showing your calculation): The R- value for a 50 mm wood fiber insulation board (k= 0.044 W/m.K)= ……….................................................................................................... The U- value for a 120 mm clay roofing tile (k= 0.75 W/m.K)= .................. The light solar gain ratio for a window with the following characteristics (U= 1.11 W/m2.K, SHGC = 86%, VT= 90%)…………………………………………………………. In a room (8*6*3.5) if the total heat losses is 1000 Watt and the percentage of ceiling losses from total was 20% , if we treat just the ceiling such that we reduce her losses by the half what will be the new total losses for the room …………………………………………………….........................................................…..arrow_forward
arrow_back_ios
arrow_forward_ios
Recommended textbooks for you
- Engineering Fundamentals: An Introduction to Engi...Civil EngineeringISBN:9781305084766Author:Saeed MoaveniPublisher:Cengage Learning
Engineering Fundamentals: An Introduction to Engi...
Civil Engineering
ISBN:9781305084766
Author:Saeed Moaveni
Publisher:Cengage Learning