QUIZ: Variable Refrigerant Flow (VRF)

1) HVAC accounts for __________ of energy use for commercial buildings?*
- A. one quarter
- B. one third
- C. one half
- D. two thirds
2) What was the 2012 market share in the U.S. for VRF?*
- A. 5%
- B. 10%
- C. 3%
- D. 1%
3) How does a VRF system basically work?*
- A. Can recover heat from spaces being cooled for use in spaced being heated and vice versa.
- B. Cools heated spaces by emitting cooling from the refrigerant piping.
- C. Heats cooled spaces by attracting the cold air to the refrigerant piping.
- D. Cools or heats outside air as needed for inside distribution.
4) With VRF, refrigerant piping replaces __________________*
- A. ductwork.
- B. floor vents.
- C. indoor fan units.
- D. condensers.
5) Fan coil units can be configured _____________________*
- A. at floor level.
- B. in or above ceilings.
- C. in walls.
- D. all of the above
6) How much energy savings does a VRF system achieve over a code-compliant conventional system?*
- A. 30%
- B. 25%
- C. 18%
- D. 10%
7) Besides energy savings, another benefit of a VRF system is that _____________*
- A. the systems take up much less space than conventional ductwork systems.
- B. VRF outside units are lightweight and easier to install.
- C. VRF installations usually have fewer components, which makes installation easier.
- D. all of the above
8) What are current installation cost estimates?*
- A. $16.50-$33 per square foot
- B. $18.50-$37 per square foot
- C. $16.50 per square foot
- D. $33 per square foot
9) What are good targets for VRF systems?*
- A. older inefficient buildings due for a retrofit
- B. buildings with multiple spaces of varied occupancy
- C. natatoriums
- D. A & B
10) In the internal air distribution system, what is the size comparison of VRF piping to conventional ductwork?*
- A. half-inch for VRF piping versus 12”+ for ductwork
- B. half-inch for VRF versus 6”-10”
- C. one inch for VRF versus 12”+
- D. one inch for VRF versus 6”-10”
11) Why has the U.S. been slow to adopt VRF systems (whereas, worldwide, VRF is about 24% of HVAC systems)?*
- A. There has not been much in the way of performance evaluation of VRF systems.
- B. The concept of heating and cooling at the same time is regarded with skepticism.
- C. Most of the units had been produced by Asian companies with a limited presence in the U.S.
- D. A & C
12) BONUS Question: What topics are you interested in reading about in future issues of the BOC Bulletin? Check your top 3 picks.
- Practical alternative energy sources
- Projects BOC graduates are doing in their buildings
- Technical updates in lighting
- Technical updates in HVAC systems
- Technical updates in building controls
- Technical updates for water conservation
- Industry trends in facilities management
13) BONUS Question: What do you consider to be the most helpful resources for information about building operation and maintenance technologies and practices? (e.g., websites, magazines, associations, vendors, etc.) List your two favorite resources.
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QUIZ: Variable Refrigerant Flow (VRF)

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