For Problem 6.49, hLoss is expressed in feet, L and D in inches, V in (ft/s), and g in (ft/s2). What is the appropriate unit for friction factor f?
What will be an ideal response?
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Compared to air conditioning evaporator coils, commercial refrigeration coils have:
A) Materials that are less brittle at low temperatures. B) Fewer fins per inch. C) More fins per inch. D) About the same number of fins per inch.
Satisfied customers will not migrate to a competitor.
What does the technician normally do when installing a gas vent on a rooftop packaged unit?
A) A vent hood is needed only if the unit is installed inside. B) The manufacturer-supplied hood is screwed onto the unit. C) An approved single-wall vent is piped at least 3 ft above the top of the unit. D) An approved double-wall vent is piped away from the unit to the side of the roof.
How is the tubing used in ground-source systems joined?
A) Flare fittings B) CPVC cement C) Threaded fittings D) Thermal fusion