Neil Revollo
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Neil Revollo
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Chapter 3 - Hydronic Heat Sources

Question 1 of 20

1

Conventional gas- and oil-fired boilers are currently used in the vast majority of residential and light commercial hydronic systems in North America.

Select one of the following:

  • True
  • False

Explanation

Question 2 of 20

1

The cast-iron sectional boiler is currently one of the most common boilers used in residential and light commercial buildings in North America.

Select one of the following:

  • True
  • False

Explanation

Question 3 of 20

1

If a cast-iron boiler is significantly oversized and experiences long off-times between firing cycles, much of the heat stored in the boiler's thermal mass can be carried up the flue by air currents passing through the combustion chamber.

Select one of the following:

  • True
  • False

Explanation

Question 4 of 20

1

Many boilers currently used in North America were designed with the intent that flue gases would condense within the boiler.

Select one of the following:

  • True
  • False

Explanation

Question 5 of 20

1

Condensing boilers are designed with large heat exchanger surfaces capable of extracting more heat from the exhaust gases compared to the heat exchangers in conventional boilers.

Select one of the following:

  • True
  • False

Explanation

Question 6 of 20

1

In full storage ETS systems, all energy used during the subsequent on-peak period is purchased and stored during the peak cycle.

Select one of the following:

  • True
  • False

Explanation

Question 7 of 20

1

The term "hydronic heat pump" always refers to a heat pump that delivers heat to a flowing stream of water.

Select one of the following:

  • True
  • False

Explanation

Question 8 of 20

1

The heating capacity of the heat pump drops rapidly with increasing source water temperature.

Select one of the following:

  • True
  • False

Explanation

Question 9 of 20

1

It is not advisable to maintain water flow through the condenser whenever the heat pump is operating.

Select one of the following:

  • True
  • False

Explanation

Question 10 of 20

1

The decision to use a wood-fueled boiler involves a time commitment much more demanding than for conventional heat sources operating on natural gas, propane, fuel oil, or electricity.

Select one of the following:

  • True
  • False

Explanation

Question 11 of 20

1

Most cast-iron sectional boilers are limited to use in __________ hydronic systems.

Select one of the following:

  • "bare-bones"

  • packaged

  • closed-loop

  • distributed

Explanation

Question 12 of 20

1

The combination of metal and water weight gives cast-iron boilers the ability to absorb a significant amount of heat. Such boilers are said to have a high __________.

Select one of the following:

  • life cycle

  • thermal mass

  • efficiency factor

  • size

Explanation

Question 13 of 20

1

One type of boiler design surrounds the combustion chamber with a water-filled heat exchanger. This arrangement is called a __________ boiler.

Select one of the following:

  • hydraulic

  • condensation

  • steam

  • wet-base

Explanation

Question 14 of 20

1

Analysis of combustion processes reveals that significant amounts of heat can be recaptured from the exhaust stream if the water vapor it contains can be _________.

Select one of the following:

  • condensed within the boiler

  • expelled from the system

  • replenished regularly

  • minimized

Explanation

Question 15 of 20

1

Boilers with low thermal mass tend to have __________ cycle efficiencies due to lesser amounts of heat remaining in the boiler following burner shutdown.

Select one of the following:

  • lower

  • unpredictable

  • higher

  • dependable

Explanation

Question 16 of 20

1

A boiler operates at __________ efficiency only when it is being fired continuously under nonvarying conditions.

Select one of the following:

  • steady-state

  • measurable

  • DOE-certified

  • manufacturer

Explanation

Question 17 of 20

1

A __________ is a device for converting low-temperature heat into higher temperature heat.

Select one of the following:

  • thermal converter

  • radiating unit

  • flue gasket

  • heat pump

Explanation

Question 18 of 20

1

A flow restriction or stoppage in the __________ can lead to rapid formation of ice crystals on the cold heat exchanger surfaces separating the water and refrigerant.

Select one of the following:

  • storage tank

  • water source

  • evaporator

  • closed-loop

Explanation

Question 19 of 20

1

In solar anti-freeze based combisystems, the outside heat dump provides a way for the system to shed excess heat. It is activated if the temperature of the thermal storage tank reaches a _________ upper limit.

Select one of the following:

  • manufacturer recommended

  • DOE enforced

  • user-set

  • local fire code

Explanation

Question 20 of 20

1

It is vital that the solar collectors and all exposed piping in a drain-back system be pitched a minimum of __________ toward the storage tank to allow complete drainage.

Select one of the following:

  • 1/4 in./ft.

  • 1/2 in./ft.

  • 1/8 in./ft.

  • 1/16 in./ft.

Explanation

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