Quiz
Chapter 3 - Hydronic Heat Sources
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Perguntas do quiz (20)
1Conventional gas- and oil-fired boilers are currently used in the vast majority of residential and light commercial hydronic systems in North America.
- AVerdadeiro
- BFalso
2The cast-iron sectional boiler is currently one of the most common boilers used in residential and light commercial buildings in North America.
- AVerdadeiro
- BFalso
3If 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.
- AVerdadeiro
- BFalso
4Many boilers currently used in North America were designed with the intent that flue gases would condense within the boiler.
- AVerdadeiro
- BFalso
5Condensing 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.
- AVerdadeiro
- BFalso
6In full storage ETS systems, all energy used during the subsequent on-peak period is purchased and stored during the peak cycle.
- AVerdadeiro
- BFalso
7The term "hydronic heat pump" always refers to a heat pump that delivers heat to a flowing stream of water.
- AVerdadeiro
- BFalso
8The heating capacity of the heat pump drops rapidly with increasing source water temperature.
- AVerdadeiro
- BFalso
9It is not advisable to maintain water flow through the condenser whenever the heat pump is operating.
- AVerdadeiro
- BFalso
10The 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.
- AVerdadeiro
- BFalso
11Most cast-iron sectional boilers are limited to use in __________ hydronic systems.
- A"bare-bones"
- Bpackaged
- Cclosed-loop
- Ddistributed
12The 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 __________.
- Alife cycle
- Bthermal mass
- Cefficiency factor
- Dsize
13One type of boiler design surrounds the combustion chamber with a water-filled heat exchanger. This arrangement is called a __________ boiler.
- Ahydraulic
- Bcondensation
- Csteam
- Dwet-base
14Analysis of combustion processes reveals that significant amounts of heat can be recaptured from the exhaust stream if the water vapor it contains can be _________.
- Acondensed within the boiler
- Bexpelled from the system
- Creplenished regularly
- Dminimized
15Boilers with low thermal mass tend to have __________ cycle efficiencies due to lesser amounts of heat remaining in the boiler following burner shutdown.
- Alower
- Bunpredictable
- Chigher
- Ddependable
16A boiler operates at __________ efficiency only when it is being fired continuously under nonvarying conditions.
- Asteady-state
- Bmeasurable
- CDOE-certified
- Dmanufacturer
17A __________ is a device for converting low-temperature heat into higher temperature heat.
- Athermal converter
- Bradiating unit
- Cflue gasket
- Dheat pump
18A 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.
- Astorage tank
- Bwater source
- Cevaporator
- Dclosed-loop
19In 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.
- Amanufacturer recommended
- BDOE enforced
- Cuser-set
- Dlocal fire code
20It 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.
- A1/4 in./ft.
- B1/2 in./ft.
- C1/8 in./ft.
- D1/16 in./ft.
Informações
- Descrição
- Quiz #3
- Autor
- Neil Revollo
- Idioma
- English
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