Deck 8: Heat Emitters

Question 1

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

A) lower
B) higher
C) thermally equalized
D) ambient

Answer 1

A

Question 2

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 ____.

A) under a source of downward drafts
B) nearest the riser's centerline
C) covered with fins
D) in the entire assembly

Answer 2

C

Question 3

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

A) open-loop
B) closed-loop
C) parallel
D) hydraulically calibrated

Answer 3

B

Question 4

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

A) greatly
B) never
C) unpredictably
D) marginally

Question 5

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

Question 6

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

Question 7

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.

A) ceramic
B) cast iron
C) open-looped
D) finned-tube

Question 8

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

Question 9

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

Question 10

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.

A) twice
B) half
C) equally
D) three times

Question 11

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

Question 12

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

Question 13

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

A) copper
B) PEX
C) cast iron
D) stainless steel

Question 14

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

A) in series
B) in parallel
C) with copper tubing
D) to a thermostat

Question 15

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

Question 16

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

Question 17

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 ____.

A) hydraulic channeling
B) thermal equilibrium
C) reverse return flow
D) radiant heat output

Question 18

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

Question 19

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

Question 20

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.

A) 5
B) 10
C) 15
D) 20