| 1. |
What does VRF stands for? |
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Valuable Refrigerant Flow |
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Variable Refrigerant Flow |
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Variable Regeneration Flow |
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Variable Refrigerant Float |
| 2. |
Refrigerant piping runs of more than 200 feet are possible and outdoor units are available in sizes up to |
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240,000 Btu/ hr. |
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24,000 Btu/ hr. |
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2,400 Btu/ hr. |
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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? |
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A heating pipe, a cooling pipe and a return pipe. |
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A large pipe, a cooling pipe and a return pipe. |
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A heating pipe, a cooling pipe and a small pipe. |
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None of the above |
| 4. |
Heat recovery can be accomplished by transferring ________ between the pipes providing refrigerant to the cooling and heating units. |
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water |
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heat |
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coolant |
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None of the above |
| 5. |
ASHRAE stands for ___________ . |
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American Society of Heating, Refrigerating and Air-Conditioning Engineers |
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American Society of Heating, Regenerating and Air-Conditioning Engineers |
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American Society of Human, Resource and Air-Conditioning Engineers |
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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. |
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True |
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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. |
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1/6th |
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1/7th |
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1/5th |
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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. |
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True |
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False |
| 9. |
____________ analysis tools should be enhanced to incorporate algorithms that can accurately model VRF systems. |
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Efficiency |
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Easy |
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Energy |
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None of the above |
| 10. |
The on-off sequencing between zones could be alternated to minimize temperature changes to _______ occupant discomfort. |
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minimize |
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maximize |
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Both a & b |
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None of the above |
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