Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN: 9781337399128
Author: Russell E. Smith
Publisher: Cengage Learning
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Chapter 2, Problem 20RQ
What is a proton? Where does it normally exist in an atom, and what is its charge?
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An office building is planned with a lateral-force-resisting system designed for earthquake resistance in aseismic zone. The seismic capacity of the proposed system, expressed as a force factor, is assumed tofollow a lognormal distribution with a median of 6.5 and a standard deviation of 1.5. The ground motionfrom the largest expected earthquake at the site is estimated to correspond to an equivalent force factor of 5.5.(a) What is the estimated probability that the building will experience damage when subjected to the largest expected earthquake?
(b) If the building survives (i.e., experiences no damage) during a previous moderate earthquake with aforce factor of 4.0, what is the updated probability of failure of the building under the largest expectedearthquake?(c) Suppose future occurrences of the largest expected earthquake follow a Poisson process with a mean return period of 500 years. Assuming that damage events from different earthquakes are statisticallyindependent,…
During a plant visit, it was noticed that a 12-m-long section of a 10-cm-diameter steam pipe is completely
exposed to the ambient air. The temperature measurements indicate that the average temperature of the
outer surface of the steam pipe is 75°C when the ambient temperature is 5°C. There are also light winds in
the area at 10 km/h. The emissivity of the outer surface of the pipe is 0.8, and the average temperature of
the surfaces surrounding the pipe, including the sky, is estimated to be 0°C. Determine the amount of heat
lost from the steam during a 10-h-long work day.
Steam is supplied by a gas-fired steam generator that has an efficiency of 80 percent, and the plant pays
$1.05/therm of natural gas. If the pipe is insulated and 90 percent of the heat loss is saved, determine the
amount of money this facility will save a year as a result of insulating the steam pipes. Assume the plant
operates every day of the year for 10 h. State your assumptions.
Chapter 2 Solutions
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
Ch. 2 - All physical objects are composed of __________....Ch. 2 - What is an atom?Ch. 2 - Which of the following is a part of the atom? a....Ch. 2 - What is static electricity?Ch. 2 - Name three ways electricity can be produced.Ch. 2 - What part do protons and electrons play in the...Ch. 2 - Which of the following is the simplest atom that...Ch. 2 - What are the four most important characteristics...Ch. 2 - What is electromotive force?Ch. 2 - Electromotive force is commonly measured in _____....
Ch. 2 - What is current?Ch. 2 - How is current measured? a. amperes b. ohms c....Ch. 2 - What is resistance?Ch. 2 - How is resistance commonly measured? a. amperes b....Ch. 2 - What is electrical power?Ch. 2 - How is electrical power commonly measured? a....Ch. 2 - Where do electrons exist in an atom, and what is...Ch. 2 - True or False: All atoms tend to lose electrons.Ch. 2 - State the law of electric charges.Ch. 2 - What is a proton? Where does it normally exist in...Ch. 2 - Describe briefly the method a dry cell battery...Ch. 2 - What is a conductor?Ch. 2 - Which of the following is the best conductor? a....Ch. 2 - What is an insulator?Ch. 2 - Which of the following is the best insulator? a....Ch. 2 - Why do metals make the best conductors?Ch. 2 - How do electric utility companies charge customers...Ch. 2 - What is the meaning of SEER when used in...Ch. 2 - State Ohms law.Ch. 2 - True or False: Ohms law applies to all types of...Ch. 2 - What is the ampere draw of a 5000-watt electric...Ch. 2 - What is the resistance of the heating element of...Ch. 2 - What is the voltage of a small electric heater if...Ch. 2 - What is the Btu/hour output of an electric heater...Ch. 2 - What is the kilowatt output of an electric heater...
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- 2nd Law of Thermodynamics A 1.5-ft3 rigid tank contains saturated refrigerant-134 at 170 psia. Initially, 20 percent of the volume isoccupied by liquid and the rest by vapor. A valve at the top of the tank is now opened, and vapor is allowedto escape slowly from the tank. Heat is transferred to the refrigerant such that the pressure inside the tankremains constant. The valve is closed when the last drop of liquid in the tank is vaporized. Determine thetotal heat transfer for this process.arrow_forwardDraw the shear and bending-moment diagrams for the beam and loading shown, and determine the maximum normal stress due to bending. 4.8 kips/ft 32 kips B C D E I Hinge 8 ft. 2 ft 5 ft 5 ft W12 x 40arrow_forward2nd Law of Thermodynamics A rigid, insulated tank that is initially evacuated is connected through a valve to the supply line that carrieshelium at 300 kPa and 140◦C. Now the valve is opened, and helium is allowed to flow into the tank until thepressure reaches 300 kPa, at which point the valve is closed. Determine the flow work of the helium in thesupply line and the final temperature of the helium in the tank.arrow_forward
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