Air filters can remove particles and dirt as small as ________
A) 10 to 25 microns B) 40 to 50 microns C) 30 to 40 microns D) 5 to 10 microns
A
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What is the heat load in a cooling tower that circulates 30,000 GPM with cooling water exiting the tower at 70 degrees F and the warm cooling water returning to the tower at 95 degrees F?
A. 750 MBTUs/min B. 4,998 MBTUs/min C. 6,247 MBTUs/min D. 7,497 MBTUs/min
Most water-cooling towers can cool the water that supplies the condenser to a temperature within ____________________°F of the wet-bulb temperature of the ambient air.
Fill in the blank(s) with the appropriate word(s).
A stream of liquid water enters a boiler and emerGes from the boiler as steam. This steam is mixed with a second stream of steam and the mixed steam is fed to a turbine. It emerges from the turbine as a VLE mixture with a quality of 0.96. The entire process operates at steady state.
An engineer draws a control volume that contains the boiler, the turbine and the mixing point. Which of the following is an energy balance that is both correct for this system and consistent with the sign conventions established in this book? A. 0= m ?_(1,in) H ?_(1,in)+ m ?_(2,in) H ?_(2,in)- (m ?_(1,in)+m ?_(2,in) ) H ?_out+W ?_s+ Q ? B. W ?_s+ Q ?= m ?_(1,in) H ?_(1,in)+ m ?_(2,in) H ?_(2,in)- m ?_out H ?_out C. ?-W ??_s= m ?_(1,in) H ?_(1,in)+ m ?_(2,in) H ?_(2,in)- m ?_out H ?_out D. m ?_(1,in)+m ?_(2,in) ?=m ??_out E. All of the above.
The remote condensing unit of a walk-in refrigerator and an A/C system are installed next to each other outside a building. They both use R22 and the outdoor ambient is 95°.
The walk-in unit’s condensing temperatures will be: a. About the same as the A/C unit. b. Much higher than the A/C unit. c. Much lower than the A/C unit.