Kaplan- Lesson 5: Mechanical Equipment and Energy Codes Flashcards
HVAC equipment consists of what two basic elements?
The plant and the distribution system
What are the three basic categories of distribution systems?
Electrical, Hydronic, & Forced Air
What kind of distribution system is the lowest in first cost and the most expensive in life-cycle costs?
Electrical
A hydronic system that has a single supply and return pipe is called a….
Single Pipe System
How is a two pipe system different that a single pipe hydronic system?
It has separate supply and return pipes
The temperature of the air as it leaves the equipment room is called the equipment temperature or the _________.
deck temperature
How does a fan coil system work in forced air distribution?
A constant volume of air is supplied from the plant in a single duct. A chilled water and hot water pipe are also supplied. At each zone there is a unit with a fan and two coils. The air is blown over the coils into the room.
The most common efficient forced air system is?
The Variable Air Volume (VAV) system
Where are unitary systems beneficial?
When the building plan is spread out and too costly to duct. There can be one unit for each zone with a unit placed on the roof or in a cabinet.
Any system in which a small amount of supply air at a very high velocity is delivered to a box-like unit and mixed with air brought in from the room.
Induction
The floor space required for the mechanical equipment is usually ______ percent of the total floor area of the building.
5- 10%
1 ton of cooling is equivalent to…
12,000 BTUh
which would melt a ton of ice over a 24-hour period.
T/F The most efficient duct is the one with the greatest perimeter.
F- The most efficient duct is the one with the least perimeter since that results in the least resistance to air movement and the least friction.
What is static head?
The friction loss expressed in inches of water per 100 feet.
What are the two basic types of energy codes?
Prescriptive and Performance Codes
A _____ code specifies how to build a building.
Prescriptive
A _____ code states what the final results need to be and how it will be measured, but does not specify how that result will be achieved.
Performance
A weighted average of U-value for all of the exterior surfaces of a building is called?
Overall Thermal Transmission Value (OTTV)
An organized process to ensure that all building systems perform interactively according to the intent of the architectural and engineering design, and the owners operating needs.
Commissioning
Which of the following systems can be combined with a four pipe hydronic system?
A. Double duct system
B. Multizone system
C. Fan coil system
D. Unitary system
C. Fan coil system
All of the following are capable of reversing the otherwise invariant flow of heat from hotter to cooler objects, EXCEPT
A. the heat pump system
B. the variable air volume system
C. the refrigeration system
D. the evaporative chiller
B. the variable air volume system
Which of the following systems can provide simultaneous heating and cooling to different rooms within the same zone?
I. Single duct constant volume with electric reheat system
II. Double duct system
III. Fan coil system
A. I & II
B. II & III
C. I & III
D. I, II, & III
D. I, II, & III
Which of the following uses the latent heat of evaporation to transfer heat?
A. evaporative chiller
B. multizone system
C. unitary system
D. variable air volume system
A. evaporative chiller
Which of the following systems can be used if each zone must have a separate utility bill>
I. Unitary system
II. Heat pump system
III. Double duct system
A. I & II
B. II & III
C. I & III
D. I, II, & III
A. I & II
I. Unitary system
II. Heat pump system
Which system uses a heat sink and often balances itself without utilizing a boiler or chiller?
A. Unitary system
B. Multizone system
C. Heat pump system
D. Variable air volume system
C. Heat pump system
Which part of the refrigeration cycle is the hottest?
A. Evaporator
B. Compressor
C. Condenser
D. Valve
C. Condenser
Which of the following hydronic systems are parallel? Check all that apply.
A. One pipe
B. Two pipe
C. Three pipe
D. Four pipe
B. Two pipe
C. Three pipe
D. Four pipe
Which of the following hydronic systems can provide both heating and cooling simultaneously?
I. One pipe
II. Two pipe
III. Three pipe
IV. Four pipe
A. I & II
B. II, III, & IV
C. III & IV
D. I, II, III, & IV
C. III & IV
III. Three pipe
IV. Four pipe
Where does return air go?
A. to the plant
B. to the outside of the building
C. to the room that requires air at that temperature
D. to the exhaust flue
A. to the plant
