Quiz
Chapter 8 - Quiz
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Perguntas do quiz (20)
1The balance between convective heat transfer and radiative heat transfer can significantly affect the comfort achieved by various heat emitters.
- AVerdadeiro
- BFalso
2Finned-tube baseboard convectors operate on the principle that heated air rises due to its lower density.
- AVerdadeiro
- BFalso
3As a rule, convectors are well suited for rooms with high ceilings.
- AVerdadeiro
- BFalso
4Parallel piping methods allow independent flow rate adjustment for each baseboard.
- AVerdadeiro
- BFalso
5When rooms lack the wall space needed to mount finned-tube baseboard, one alternative is to use a hydronic fan-coil.
- AVerdadeiro
- BFalso
6The heat output of a fan-coil is approximately proportional to the temperature difference between the entering air and entering water.
- AVerdadeiro
- BFalso
7The rate of heat transfer depends on either the temperature difference or the flow rate.
- AVerdadeiro
- BFalso
8Panel radiators typically require much more wall space than fin-tube baseboard sized for equivalent heat output and operating conditions.
- AVerdadeiro
- BFalso
9Reverse return piping encourages equal flow rates and equal supply temperature to each radiator.
- AVerdadeiro
- BFalso
10A rule of thumb is to allow twice the linear footage of radiant baseboard compared to typical residential finned-tube baseboard.
- AVerdadeiro
- BFalso
11A typical finned-tube baseboard convector consists of a sheet metal enclosure containing a __________ tube fitted with aluminum fins.
- Acopper
- BPEX
- Ccast iron
- Dstainless steel
12The heat output of finned-tube baseboard is expressed in Btu/hr./ft. of active element length. The active length of the element is the length of pipe _________.
- Aunder a source of downward drafts
- Bnearest the riser's centerline
- Ccovered with fins
- Din the entire assembly
13When baseboards are connected _________, each receives water at the temperature supplied to the manifold.
- Ain series
- Bin parallel
- Cwith copper tubing
- Dto a thermostat
14Hydronic fan-coils have two common components—a(n) __________ heat exchanger (often called the “coil”) through which system fluid flows and a blower or fan that forces air to flow across the coil.
- Aceramic
- Bcast iron
- Copen-looped
- Dfinned-tube
15Increasing the fluid flow rate through the coil will __________ increase the heating capacity of the fan-coil.
- Agreatly
- Bnever
- Cunpredictably
- Dmarginally
16To prevent corrosion, steel panel radiators should only be used in __________ systems.
- Aopen-loop
- Bclosed-loop
- Cparallel
- Dhydraulically calibrated
17Operating panel radiators at __________ water temperatures increases the percentage of radiant versus convective heat output from the panel.
- Alower
- Bhigher
- Cthermally equalized
- Dambient
18The head loss of radiant baseboard can be determined by considering each baseboard to be a tubing circuit approximately _________ as long as the baseboard extrusion.
- Atwice
- Bhalf
- Cequally
- Dthree times
19One way that heat loss of bare copper tube can be evaluated is when the length of the copper tube in feet divided by the flow rate in gallons per minute exceeds __________ ft./gpm, there will be a greater temperature drop along the tube from inlet to outlet.
- A5
- B10
- C15
- D20
20Every hydronic heating system attempts to establish operating conditions that allow the distribution system to current rate of heat output from the heat source. This state is known as __________.
- Ahydraulic channeling
- Bthermal equilibrium
- Creverse return flow
- Dradiant heat output
Informações
- Descrição
- Heat Emitters
- Autor
- Neil Revollo
- Idioma
- English
- Visualizações
- 861
- Etiquetas
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