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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Chapter 42, Problem 12RQ
To determine
The part of space that is not taken into account during the calculation of heat loss.
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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.
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
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_forwardAll 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.arrow_forwardWhich 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_forward
- U- Moodle English (en) The temperature distribution through a furnace wall consisting of firebrick and high-temperature block insulation and steel plate is measured as shown in the figure below. The thermal conductivity of fire brick is 1.13 W/(m.K). Find the combined convention coefficient for the outside surface of the furnace wall. 3 5 9. 760°C 758°C Block insulation 727°C |Outside air Hot gase daseā 68.42°C 26.5°C 68.5°C 6.35cm 12.7cm 0.635cm Fire bri ck Steel casti ngarrow_forwardThere is a room with room vol: 300 M3 Maximum room temperature: 22 oC Cooling system: AHU Question : how to calculate ideal cooling capacity (BTU/hour) if 10 people worked inside for 7 hours?arrow_forward42.The amount of heat required to raise the temperature of 2 kg of iron (sp. Heat = 0.115 kcal/kg-C) from 27C to 100C is:arrow_forward
- Which of the following is true for a large heat transfer coefficient? A. It is equivalent to a zero thermal resistance. B. It depends on the fluid temperature. C. It is equivalent to an infinite thermal resistance. D. It is equivalent to a small thermal resistance. E. It is equivalent to a large thermal resistance.arrow_forwardPlease explain all parts and which formulas to usearrow_forwardAir movement in a room is 0.4 m/s and light clothing (0.5 clo) is being worn by the occupants. If the activity level is considered as 2.5 met, what is the operative temperature? Hint: Use Figure 4-3b to obtain To and then convert from Celcius to Fahrenhite. O a. 73.4°F Ob. 76.1°F OC. 66.2°F Od. 69.0°F O e. 80.4°Farrow_forward
- 4arrow_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_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
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