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 13RQ
All of the following are taken into account on a heat gain calculation except
A. exterior walls.
B. partition walls.
C. basement floors.
D. top-floor ceilings.
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Students have asked these similar questions
Which of the following will have a higher rate of heat transfer. With conduction heat transfer.
A. pulverized shale stone
B. the stone and the pulverized shale will have the same heat transfer as they have the same conductivity constant.
C. a solid block of shale stone
D. the pulverized shale will have a higher heat transfer as it has a higher duction coefficient
The Biot number less than 0.1 indicates the following in terms of temperature distribution in one direction in the solid?
a. Its heat transfer coefficient is quite small.
b. The temperature increase in that direction does not change much due to heat generation.
c. The temperature change in that direction is negligible.
D. None.
e. The temperature drop in that direction is considerably higher due to the high convection on the solid surface.
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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- (A) Choose the right answer 1.The temperature profile for heat conduction through a wall of constant thermal conductivity in the presence of heat source is a. straight line. b. parabolic. c. logarithmic. d. hyperbolic 2. A furnace wall has a thickness L=200 cm and k=0.1 W/(mK) with surface temperatures of 600°C and 400 C. The rate of heat transfer is a. 100 W/m? b. 200 W/m? c. 50 W/m? d. 300 W/m? 3. The ratio of heat transfer of a fin to the heat transfer without fin is referred to as a. fin effectiveness. b. b. fin efficiency. c. b. fin resistance. d. fin conductance. 4. The internal thermal resistance of a solid can be ignored if the Biot number is less than а. 0.1 b. 0.5 с. 1 d. Fourier number 5. The quantity having the dimension of time is often called the time constant of a thermocouple hA а. PCV hV b. c. PCV hA d. PCA hV PCAarrow_forward4. 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_forwardThe typical indoor design temperature used for heat loss calculations is A. 65F. B. 70F. C. 75F. D. 80F.arrow_forward
- Heat transfer through the walls can be considered as steady under the assumption that the highest temperature setting for the oven, and the standard room temperature for the ambient. True or False True Falsearrow_forwardWhich 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 validarrow_forward2 Which of the following chemical is used for heat transfer? a. Liquid Ammonia b. LiBr c. Ethyl Glycol d. Waterarrow_forward
- Which house uses more energy. Haron's house in June or Areum's house in December? Why do you think so? Haron's House Areum's House YLEENEDGARD ** TALE Seoul, Korea Singapore 3-bedroom 2 bathrooms 4-bedroom, 3 bathrooms Well insulated Poody insulated Built 1997 Bricks and cement only Built 1925, renovated 2005 Bricks with wood siding 3 heaters 3 air-conditioning units As Uncle Areum and Uncle Haron continue to argue, you slip away to another (quieter) room. Pulling out a pad of paper, you begin to think about what factors will have an influence on how much energy is needed to heat or cool each house. AT R- R=AA 9 MMMMMM TITEarrow_forwardPlease explain all parts and which formulas to usearrow_forwardi need the answer quicklyarrow_forward
- Which two of the following are best correct statements for the wall with the temperature distribution shown below: A) The heat flux would be constant at any location in the wall B) It is unclear if heat is being generated within the wall C) Heat does not flow across the centerline D) Everywhere inside the wall, heat flows only to the right( same direction as the x-direction E) If the convection outside the wall is occuring with a normal magnitude of h, then it can be expected that Ts >> Tinfinityarrow_forwardC) Answer the question shown in the imagearrow_forward41.)arrow_forward
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