Neil Revollo
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Quiz #3

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Neil Revollo
Creado por Neil Revollo hace alrededor de 8 años
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Chapter 3 - Hydronic Heat Sources

Pregunta 1 de 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.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 2 de 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.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 3 de 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.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 4 de 20

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 5 de 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.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 6 de 20

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 7 de 20

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 8 de 20

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 9 de 20

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 10 de 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.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 11 de 20

1

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

Selecciona una de las siguientes respuestas posibles:

  • "bare-bones"

  • packaged

  • closed-loop

  • distributed

Explicación

Pregunta 12 de 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 __________.

Selecciona una de las siguientes respuestas posibles:

  • life cycle

  • thermal mass

  • efficiency factor

  • size

Explicación

Pregunta 13 de 20

1

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

Selecciona una de las siguientes respuestas posibles:

  • hydraulic

  • condensation

  • steam

  • wet-base

Explicación

Pregunta 14 de 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 _________.

Selecciona una de las siguientes respuestas posibles:

  • condensed within the boiler

  • expelled from the system

  • replenished regularly

  • minimized

Explicación

Pregunta 15 de 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.

Selecciona una de las siguientes respuestas posibles:

  • lower

  • unpredictable

  • higher

  • dependable

Explicación

Pregunta 16 de 20

1

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

Selecciona una de las siguientes respuestas posibles:

  • steady-state

  • measurable

  • DOE-certified

  • manufacturer

Explicación

Pregunta 17 de 20

1

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

Selecciona una de las siguientes respuestas posibles:

  • thermal converter

  • radiating unit

  • flue gasket

  • heat pump

Explicación

Pregunta 18 de 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.

Selecciona una de las siguientes respuestas posibles:

  • storage tank

  • water source

  • evaporator

  • closed-loop

Explicación

Pregunta 19 de 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.

Selecciona una de las siguientes respuestas posibles:

  • manufacturer recommended

  • DOE enforced

  • user-set

  • local fire code

Explicación

Pregunta 20 de 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.

Selecciona una de las siguientes respuestas posibles:

  • 1/4 in./ft.

  • 1/2 in./ft.

  • 1/8 in./ft.

  • 1/16 in./ft.

Explicación