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HVAC Variable Refrigerant Flow


Quiz Questions

1.What does VRF stands for?
Valuable Refrigerant Flow
Variable Refrigerant Flow
Variable Regeneration Flow
Variable Refrigerant Float
2. Refrigerant piping runs of more than 200 feet are possible and outdoor units are available in sizes up to
240,000 Btu/ hr.
24,000 Btu/ hr.
2,400 Btu/ hr.
2,40 Btu/ hr
3.Three-pipe systems work best when there is a need for some of the spaces to be cooled and some of them to be heated during the same period. What are the three pipes?
A heating pipe, a cooling pipe and a return pipe.
A large pipe, a cooling pipe and a return pipe.
A heating pipe, a cooling pipe and a small pipe.
None of the above
4.Heat recovery can be accomplished by transferring ________ between the pipes providing refrigerant to the cooling and heating units.
water
heat
coolant
None of the above
5.ASHRAE stands for ___________ .
American Society of Heating, Refrigerating and Air-Conditioning Engineers
American Society of Heating, Regenerating and Air-Conditioning Engineers
American Society of Human, Resource and Air-Conditioning Engineers
None of the above
6.Less economizer cycle benefit may not occur with the smaller ventilation system since the ducting is sized just for ventilation.
True
False
7.Duct losses are confined to the ventilation air which is normally about _________ of the air flow of a ducted system circulating and conditioning both the ventilation air and the recirculated air.
1/6th
1/7th
1/5th
None of the above
8.Low-profile, low space requirements and light weight make units easier to fit into tight spaces and to avoid obtrusive terminal units that could spoil the aesthetics of a space.
True
False
9.____________ analysis tools should be enhanced to incorporate algorithms that can accurately model VRF systems.
Efficiency
Easy
Energy
None of the above
10.The on-off sequencing between zones could be alternated to minimize temperature changes to _______ occupant discomfort.
minimize
maximize
Both a & b
None of the above