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Block 2 > Introduction To Hydronic Radint Heatng Design :A > Flashcards

Introduction To Hydronic Radint Heatng Design :A Flashcards

1
Q

How much 1/2” tubing can be on one loop?

A

300ft

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2
Q

How much 3/4 tube can be on one loop?

A

500 ft

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3
Q

To determine tubing size what 3 factors must be known?

A

Gallons per minute flow rate

Length of circuit

Designed temperature drop through the circuit

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4
Q

What is the formula for GPM on a circuit?

A
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5
Q

What is the formulae to find the required BTU’ a per square foot required in a zone?

A

Btus divided by square feet of zone

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6
Q

In floor heating heats by

A

Convection and radiation

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7
Q

What is this piping layout called and used for?

A

Single serpentine
One exterior wall

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8
Q

What is this piping layout called and used for?

A

Double serpentine
2 exterior walls

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9
Q

What is this piping layout called and used for?

A

Triple serpentine
3 exterior walls

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10
Q

What is this piping pattern called and used for?

A

Counterflow
Heat loss is evenly distributed

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11
Q

What are the 4 installation methods for in floor radiant heating?

A

Poured in a concrete slab

Poured in an underlay on a suspended wooden floor

The sandwich method

Suspended below a wooden floor between joists

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12
Q

How close must fasteners be on rebar?

A

At least every 3’

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13
Q

Where else on the rebar must you put fasteners?

A

Each side of the arch and in the center

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14
Q

What is the maximum spacing between tubes embedded in a thermal mass?

A

Maximum 12”

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15
Q

What are the testing my parameters for in floor heating?

A

The greater of 60 psi or 1.5 times the working pressure for one hour with no pressure loss.

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16
Q

What do expansion joints in the concrete do?

A

Absorb horizontal movement cause by thermal expansion and contraction

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17
Q

A normally open zone valves power to do what?

A

Keep the zone valve closed.

18
Q

A normally closed zone valve requires power to do what?

A

Requires power to open it.

19
Q

A normally open zone valve requires why kind of thermostat?

A

Normally open thermostat

20
Q

A normally closed zone valve requires what kind of thermostat?

A

Normally closed thermostat.

21
Q

Installing the wrong kind of thermostat on a zone valve will do what?

A

Cause the valve to operate in reverse and supply heat when not required or remove heat demand when heat is required .

22
Q

How long does an actuator type zone valve take to fully open?

A

3-5 minutes

23
Q

Where are zone valves installed?

A

Prior to the manifold serving more than one circuit or directly on a manifold serving individual circuits.

24
Q

Where is the thermostat for a zone valve installed?

A

The area with the greatest heat loss.

25
Q

What can replace a zone valve?

A

A pump.

26
Q

In a primary/secondary piping system what is the maximum distance between T’s?

A

4 pipe diameters to a maximum of 12”

27
Q

What is this?

A

3 way mixing valve.

28
Q

In what position is this 3 way mixing valve?

A

Fully open

29
Q

What position is this 3 way mixing valve in?

A

Fully closed

30
Q

In what position is this 3 way mixing valve?

A

Partially open (mixing)

31
Q

When installing tubing in a radiant floor heating system which area of the room should the start of the loop be?

A

The areas with the greatest heat loss.

32
Q

Is insulation required below a poured in concrete application?

A

Yes. Code requires it.

33
Q

When are supplemental heating units installed in radiant floor heating systems?

A

When the radiant floor does not keep up with the heat load.

34
Q

What two factors are required to calculate header size?

A

Gallons per minute and velocity .

35
Q

Is a bypass pump between the supply and return piping required on a low mass boiler that is flow sensitive?

A

Yes

36
Q

What is required when a conventional boiler is installed in a low temperature radiant floor heating application?

A

A mixing valve

37
Q

What is the function of a 3 or 4 way mixing valve ina hydronic heating system?

A

Mixes water from the heat source and the system return in order to temper system supply water.

38
Q

What must be installed with a three or four way mixing valve in order to protect the heat source and the radiant floor system?

A

A drive motor and controller .

39
Q

What should be installed to separate the boiler water and system water when glycol is added to the water in a radiant floor heating system?

A

A plate heat exchanger

40
Q

What is required when a variable speed injection pump is installed in a two temperature system ?

A

A controller for the pump.

Block 2 (33 decks)

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