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chapter 5
Copyright Cengage Learning. Powered by Cognero.
Page 1
Indicate whether the statement is true or false.
1. All renewable energy heat sources function at higher thermal efficiency when matched with high-water-temperature
heat emitters.
a.
True
b.
False
2. Most panel radiators have a high thermal mass.
a.
True
b.
False
3. A parallel distribution system is generally preferred to a series distribution system when low supply water temperatures
are used.
a.
True
b.
False
4. Steel panel radiators should only be used in closed-loop systems.
a.
True
b.
False
5. A minimum tube spacing of 15 inches is recommended for heated slab-on-grade floors.
a.
True
b.
False
Indicate the answer choice that best completes the statement or answers the question.
6. Which best describes the experience of walking barefoot on heated floors in a low-energy use building?
a.
The floor feels slightly warm.
b.
The floor feels slightly cool.
c.
The floor feels hot, but cools very quickly when coming in contact with the skin.
d.
The floor feels about the same as walking on a carpet or rug.
7. The thermal mass of a heated slab-on-grade floor is best described as ____.
a.
high relative to other hydronic heating emitters
b.
low relative to other hydronic heating emitters
c.
about the same as most other hydronic heating emitters
d.
dependent on the type of soil beneath the floor
8. For standard fin-tube baseboard, what is the preferred energy source?
a.
a solar collector
b.
a high-temperature boiler
c.
a low-temperature boiler
d.
any renewable energy source
9. Above-floor tube and plate panels typically operate at what water temperature?
a.
higher compared to slab systems
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b.
lower compared to slab systems
c.
about the same as slab systems
d.
a wider range of water temperatures than slab systems
10. What is the first step in sizing parallel-piped baseboards?
a.
Select a supply water temperature.
b.
Estimate the flow rate in each circuit.
c.
Determine the design heating load for each baseboard.
d.
Estimate the heat output of the baseboard.
11. Which of these measures thermal efficiency in a water-to-water heat pump operating in heating mode?
a.
coefficient of heat flow
b.
coefficient of thermal mass
c.
coefficient of efficiency
d.
coefficient of performance
12. What is EN442?
a.
a standard method for establishing the coefficient of performance of a fin-tube radiator
b.
a standard method for determining heat output of panel radiators
c.
a standard method for determining spacing of slab-on-grade radiant heating
d.
a standard method for determining required baseboard length for a given heat output
13. Which heat emitter typically has the highest thermal mass?
a.
cast-iron radiator
b.
four-inch concrete slab
c.
radiant ceiling panel
d.
tube and plate floor
14. In which situation would radiant wall panels be preferable to radiant floor panels?
a.
finish flooring with high thermal resistance
b.
finish flooring with low thermal resistance
c.
if the floor and wall surfaces are not compatible with contact adhesive
d.
if the flooring is painted
15. In which system is air pulled through a heat exchanger by a blower?
a.
conduction fan coil
b.
forced fan coil
c.
blow-through fan coil
d.
draw-through fan coil
16. What type of tubing is typically used in heated thin slabs?
a.
steel
b.
copper
c.
PEX or PEX-AL-PEX
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d.
PVC
17. What is the maximum recommended resistance of finish flooring when a renewable energy source is used in a heated
slab-on-grade floor system?
a.
R-value 0.2
b.
R-value 0.5
c.
R-value 1.0
d.
R-value 1.5
18. Which statement best describes the water temperature as it passes through fin-tube baseboard?
a.
The water temperature continually drops.
b.
The water temperature continually increases.
c.
It depends on the mounting orientation of the unit.
d.
It depends on the temperature of the incoming water.
19. What is NOT a typical application of hydronic radiant panel heating?
a.
floor heating
b.
wall heating
c.
ceiling heating
d.
water heating
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Date:
chapter 5
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Page 4
Answer Key
