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 4, Problem 1RQ
Where would a technician encounter freezing temperatures when working with liquid refrigerant?
Expert Solution & Answer
To determine
The condition where the technician will encounter the freezing temperatures while working with liquid refrigerant.
Answer to Problem 1RQ
A technician will encounter a freezing temperature when the liquid refrigerant gets mixed with the atmosphere and absorbs the heat to produce a cooling effect.
Explanation of Solution
While working with the liquid refrigerants, it is essential to take preventions before doing any operation with liquid refrigerants. Liquid refrigerants can be harmful in nature. Liquid refrigerant can cause a high temperature drop, if it leaks out of the cylinder.
When liquid refrigerant leaks out from the cylinder it produces a drop in local temperature as, the liquid refrigerant absorbs heat from the surroundings and cool it down to a lower temperature.
As a technician is working with liquid refrigerant, he will feel a freezing temperature when there is a leak in cylinder.
Conclusion:
Thus, a technician will encounter a freezing temperature when the liquid refrigerant gets mixed with the atmosphere and absorbs the heat to produce a cooling effect.
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motor supplies 200 kW at 6 Hz to flange A of the shaft shown in Figure. Gear B transfers 125 W of power to operating machinery in the factory, and the remaining power in the shaft is mansferred by gear D. Shafts (1) and (2) are solid aluminum (G = 28 GPa) shafts that have the same diameter and an allowable shear stress of t= 40 MPa. Shaft (3) is a solid steel (G = 80 GPa) shaft with an allowable shear stress of t = 55 MPa. Determine:
a) the minimum permissible diameter for aluminum shafts (1) and (2)
b) the minimum permissible diameter for steel shaft (3).
c) the rotation angle of gear D with respect to flange A if the shafts have the minimum permissible diameters as determined in (a) and (b).
Chapter 4 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
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