Chapter 7 Heating Production Equipment and Systems
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
1) Name the temperature ranges (°F) associated with these heating media:
A. Low temperature hot water
B. Medium temperature hot water
C. High temperature hot water
1)
_____________
2) Name the pressure ranges (Psig) associated with these heating steam classifications in
buildings:
A. Low pressure steam
B. Medium pressure steam
C. High pressure steam
2)
_____________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
3) Which of the following components and subsystems might be required for a heating hot water
system? Select all that apply.
3) _______
A) Condensate return B) Boilers C) Coils
D) Deaeration E) Heat exchangers F) Makeup water
4) The lower heating value (LHV) of a fuel is which of the following? 4) _______
A) Heat from adiabatic combustion initially at 25°C and cooling combustion products to 25°C.
B) Heat from combustion initially at 100°C with 10% excess air and cooling the flue gas to
100°C.
C) Heat by stoichiometric combustion initially at 25°C and cooling combustion products to
150°C.
5) The higher heating value (HHV) of a fuel is which of the following? 5) _______
A) Heat from adiabatic combustion initially at 100°C and cooling combustion products to
25°C.
B) Heat from combustion initially at 100°C with 10% excess air and cooling the flue gas to
100°C.
C) Heat by stoichiometric combustion initially at 25°C and cooling combustion products to
25°C.
6) Improvements in annual fuel utilization efficiency have been achieved by which of the
following? Select all that apply.
6) _______
A) Heavier heat exchangers. B) Better control of air/fuel ratio.
C) Electronic ignition. D) Higher heating value in fuel gases.
7) Boilers and furnaces which condense flue gas in second heat exchangers generally have annual
efficiencies in what range?
7) _______
A) 85% to 89.5% B) 95% to 99.5% C) 92% to 98.5% D) 90% to 95.5%
8) Which of the following are characteristics of Scotch marine boilers? Select all that apply. 8) _______
A) They are low profile. B) They respond well to stable loads.
C) They are condensing design. D) They are water tube design.
9) Which of the following loads will result in most efficient operation for a condensing boiler? 9) _______
A) Radiant floor. B) Heating coil in air handling unit.
C) Baseboard convector. D) Reheat coil in VAV reheat box.
10) Why would an engineer decide to use a low temperature hot water system rather than a medium
temperature design? Select all that apply.
10)
______
A) The boilers are more efficient than medium temperature designs.
B) Piping doesn’t need to be insulated.
C) They use smaller piping.
D) Pipe expansion is easier to control.
11) How much combustion air is needed for boilers? 11)
______
A) Between 5% and 15% more than for stoichiometric combustion depending on burner
design.
B) Approximately 30% more than needed for stoichiometric combustion.
C) The amount needed for stoichiometric combustion.
12) Which of the following statements are correct regarding direct-burial fuel tanks? Select all that
apply.
12)
______
A) Unlike fiberglass tanks, steel tanks are heavy enough not to need weighting to avoid
buoyancy.
B) Steel tanks are more fire-resistant and durable than fiberglass.
C) The double-wall feature traps leaking oil to prevent contamination of surrounding soil.
D) The double-wall feature eliminates the need for monitoring.
13) Should combustion air be heated in the winter? 13)
______
A) Yes, if there is danger of freezing piping in the boiler room.
B) No, because there is sufficient heat in the room to prevent the need for heating the air.
C) No, because it reduces overall efficiency of the boiler plant.
14) If flue gas temperatures in a gas fired boiler go below 300°F, what is a possible consequence? 14)
______
A) Reduced efficiency.
B) Condensation of moisture.
C) Change in flue gas color.
15) If the draft available at a boiler outlet is lower than recommended, which of the following might
correct the situation?
15)
______
A) Shorten the stack.
B) Install an induced draft fan.
C) Install a pressure balancing damper.
16) Which of the following is the primary cause of corrosion in ferrous piping systems? 16)
______
A) Alkalinity. B) Oxygen. C) Calcium salts.
17) Cost per mmBtu of steam from a district heating plant is characterized by which of the
following?
17)
______
A) More than the cost of steam produced on site due to capital investment for the plant.
B) Less than the cost of steam produced on site due to higher efficiency.
C) Approximately equal to the cost of stream produced on site since fuel costs are equal.
18) Which is true of cogeneration plants? Select all that apply. 18)
______
A) Economics are very sensitive to fuel costs.
B) Cogeneration is generally restricted to large facilities.
C) Overall efficiency is generally very high.
19) Which is the most cost-effective application of solar energy? 19)
______
A) Solar heating, hydronic collectors.
B) Solar cooling by absorption.
C) Solar pool heating.
