EP ENGR.MECH.-MOD.MASTERING ACCESS
15th Edition
ISBN: 9780134867267
Author: HIBBELER
Publisher: PEARSON CO
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The evaporator of a vapor compression refrigeration cycle utilizing R-123 as the refrigerant isbeing used to chill water. The evaporator is a shell and tube heat exchanger with the water flowingthrough the tubes. The water enters the heat exchanger at a temperature of 54°F. The approachtemperature difference of the evaporator is 3°R. The evaporating pressure of the refrigeration cycleis 4.8 psia and the condensing pressure is 75 psia. The refrigerant is flowing through the cycle witha flow rate of 18,000 lbm/hr. The R-123 leaves the evaporator as a saturated vapor and leaves thecondenser as a saturated liquid. Determine the following:a. The outlet temperature of the chilled waterb. The volumetric flow rate of the chilled water (gpm)c. The UA product of the evaporator (Btu/h-°F)d. The heat transfer rate between the refrigerant and the water (tons)
The blade support of a hacksaw is subject to compression when a blade is installed and tightened. What is the state of stress (total combined stress) at A in MPa if the
compression in the support is 1,524 N. Note: pay close attention to what is compression and what is tension and use a negative sign for the former.
100 mm
8 mm
3 mm
75 mm
A
8 mm
3 mm
B
50 mm
The answer is not 4.378 ft/s
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