Neil Revollo
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Heat Emitters

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Neil Revollo
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Chapter 8 - Quiz

Chapter 8 - Quiz

Question 1 of 20

1

The balance between convective heat transfer and radiative heat transfer can significantly affect the comfort achieved by various heat emitters.

Select one of the following:

  • True
  • False

Explanation

Question 2 of 20

1

Finned-tube baseboard convectors operate on the principle that heated air rises due to its lower density.

Select one of the following:

  • True
  • False

Explanation

Question 3 of 20

1

As a rule, convectors are well suited for rooms with high ceilings.

Select one of the following:

  • True
  • False

Explanation

Question 4 of 20

1

Parallel piping methods allow independent flow rate adjustment for each baseboard.

Select one of the following:

  • True
  • False

Explanation

Question 5 of 20

1

When rooms lack the wall space needed to mount finned-tube baseboard, one alternative is to use a hydronic fan-coil.

Select one of the following:

  • True
  • False

Explanation

Question 6 of 20

1

The heat output of a fan-coil is approximately proportional to the temperature difference between the entering air and entering water.

Select one of the following:

  • True
  • False

Explanation

Question 7 of 20

1

The rate of heat transfer depends on either the temperature difference or the flow rate.

Select one of the following:

  • True
  • False

Explanation

Question 8 of 20

1

Panel radiators typically require much more wall space than fin-tube baseboard sized for equivalent heat output and operating conditions.

Select one of the following:

  • True
  • False

Explanation

Question 9 of 20

1

Reverse return piping encourages equal flow rates and equal supply temperature to each radiator.

Select one of the following:

  • True
  • False

Explanation

Question 10 of 20

1

A rule of thumb is to allow twice the linear footage of radiant baseboard compared to typical residential finned-tube baseboard.

Select one of the following:

  • True
  • False

Explanation

Question 11 of 20

1

A typical finned-tube baseboard convector consists of a sheet metal enclosure containing a __________ tube fitted with aluminum fins.

Select one of the following:

  • copper

  • PEX

  • cast iron

  • stainless steel

Explanation

Question 12 of 20

1

The 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 _________.

Select one of the following:

  • under a source of downward drafts

  • nearest the riser's centerline

  • covered with fins

  • in the entire assembly

Explanation

Question 13 of 20

1

When baseboards are connected _________, each receives water at the temperature supplied to the manifold.

Select one of the following:

  • in series

  • in parallel

  • with copper tubing

  • to a thermostat

Explanation

Question 14 of 20

1

Hydronic 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.

Select one of the following:

  • ceramic

  • cast iron

  • open-looped

  • finned-tube

Explanation

Question 15 of 20

1

Increasing the fluid flow rate through the coil will __________ increase the heating capacity of the fan-coil.

Select one of the following:

  • greatly

  • never

  • unpredictably

  • marginally

Explanation

Question 16 of 20

1

To prevent corrosion, steel panel radiators should only be used in __________ systems.

Select one of the following:

  • open-loop

  • closed-loop

  • parallel

  • hydraulically calibrated

Explanation

Question 17 of 20

1

Operating panel radiators at __________ water temperatures increases the percentage of radiant versus convective heat output from the panel.

Select one of the following:

  • lower

  • higher

  • thermally equalized

  • ambient

Explanation

Question 18 of 20

1

The head loss of radiant baseboard can be determined by considering each baseboard to be a tubing circuit approximately _________ as long as the baseboard extrusion.

Select one of the following:

  • twice

  • half

  • equally

  • three times

Explanation

Question 19 of 20

1

One 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.

Select one of the following:

  • 5

  • 10

  • 15

  • 20

Explanation

Question 20 of 20

1

Every 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 __________.

Select one of the following:

  • hydraulic channeling

  • thermal equilibrium

  • reverse return flow

  • radiant heat output

Explanation

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