Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Textbook Question
Chapter 42, Problem 14RQ
How much heat is lost through a 3' × 5' single-pane window with a storm that is exposed to a 60°F temperature differential?
A. 450 Btu/h
B. 900
C. 1350 Btu/h
D. 1800 Btu/h
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Which one of the following processes of heat transfer requires the presence of a fluid?
a. conduction
b. radiationc. convectiond. none of the above choices are valid
True or false thermal energy moves from a colder region of an object to a hotter region
When heat energy transfers through a liquid
or gas, what is it called?
Select one:
a. Conduction
b. Convection
c. Radiation
d. Induction
Chapter 42 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 42 - An oversized air-conditioning system will A. cost...Ch. 42 - Methods used to calculate the heat gain and heat...Ch. 42 - An exterior wall A. separates a conditioned...Ch. 42 - A partition wall A. separates a conditioned...Ch. 42 - As the temperature differential across a panel...Ch. 42 - The typical indoor design temperature used for...Ch. 42 - The typical indoor design temperature used for...Ch. 42 - If a heating system was being designed for use in...Ch. 42 - If an air-conditioning system was being designed...Ch. 42 - If the R-value of a construction material is 2.0,...
Ch. 42 - If a wall is made up of four different materials,...Ch. 42 - Prob. 12RQCh. 42 - All of the following are taken into account on a...Ch. 42 - How much heat is lost through a 3' 5' single-pane...Ch. 42 - Which of the following is(are) true regarding a...Ch. 42 - Which of the following is(are) true regarding the...
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- The typical indoor design temperature used for heat loss calculations is A. 65F. B. 70F. C. 75F. D. 80F.arrow_forwardTellarrow_forwardA metal spoon and a wooden spoon are left overnight in a room. Why do we feel colder when we touch the metal spoon than when we touch the wooden one? a. Since metals usually have a lower heat capacity than non-metals, the metal spoon loose more heat to the room and consequently has a lower temperature b. Metals release heat faster than non-metals because of their higher thermal conductivity c. This is merely psychological since we are conditioned to think of metals as “cold” d. Metals absorb heat faster than non-metals because of their higher thermal conductivityarrow_forward
- 4. Describe each of the three methods of heat transfer, in your own words. Make sure to explain how you can tell that that kind of heat transfer is happening.a. Conductionb. Convectionc. Radiationarrow_forwardOn a windy day, a camper feels colder as compared to a day at the same temperature when there is no wind. Which of the following heat transfer mechanisms explains this result? a. Convection b. Radiation c. None of the above d. All of the above e. Conductionarrow_forwardUsing the SEER calculation, how much money would you spend to run your air conditioning system if it cost $.10 per Kw during the cooling season? 3 TON, 14 SEER unit. Remember the unit will run for about 976 hours during this season. O $390.80 $450.30 O$250.97 $100.00arrow_forward
- If a heating system was being designed for use in Modesto, California, what temperature difference would be used for calculations? A. 30F B. 40F C. 50F D. 60Farrow_forwardSpecific heat is the amount of heat necessary to raise the temperature of 1 lb of a ______1F.arrow_forwardThe pressure 3 meters below the free surface of a liquid is 3.2 lb/in2. What is the specific gravity of the liquid? a. 0.11 b. 46 c. 75 d. 0.75arrow_forward
- The pressure 3 meters below the free surface of a liquid is 3.2 lb/in2. Whatis the specific gravity of the liquid? (Can you show the diagram or illustration if possible. Thank you!) a. 46 b. 0.75 c. 75 d. 0.11arrow_forwardWhich of the following terms describes the temperature difference in Fo that must exist across thesurface area of a structure to drive 1 Btu per hour through 1 square foot of surface.arrow_forwardWhat is the mode of heat transfer when you blow on your hards to warm them up in the cold weather? a. convection b. conduction c. explanation d. radiationarrow_forward
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