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Danica’s Steamfitter III Review > Heat Loss Calculation > Flashcards

Heat Loss Calculation Flashcards

1
Q

What is the primary purpose of a heating system?

A

To provide comfort to the individuals in the space.

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2
Q

Which direction does heat always travel in?

A

From warm objects to cooler objects.

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3
Q

What is not considered when calculating heat loss?

A

Interior walls of the building

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4
Q

ODT is an acronym for:

A

Outdoor design temperature

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5
Q

What does the designed temperature difference refer to?

A

The indoor temperature minus the outdoor temperature.

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6
Q

What is the recommended practise for determining room dimensions?

A

Measurements should be rounded up or down to the nearest 0.25 of a foot.

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7
Q

Which type of heat loss results in cool air flow from the outside being drawn into the building through cracks around windows, doors and loose construction?

A

Infiltration losses

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8
Q

Which of the heat loss types transfers through a ceiling?

A

Transmission losses

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9
Q

Finned baseboard heating capacity is expressed in what unit?

A

BTU per hour per linear foot

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10
Q

Which type of application are kickspace heating units ideal for?

A

Limited wall space due to cabinets and cupboards.

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11
Q

What are the three major components of a finned baseboard?

A

Radiant fin, housing and supply tube

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12
Q

What is the main function of the adjustable damper on a baseboard cabinet?

A

To slow or increase the convection air flow

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13
Q

What is the procedure for calculating the amount of finned baseboard required in a given space?

A

Divide the space heat loss by the output rating of the baseboard selected.

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14
Q

At design, which two design factors determine the output of a finned baseboard?

A

Supply water temperature and GPM

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15
Q

What causes frequent cycling of a boiler?

A

A boiler with excessive pressure.

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16
Q

What procedure should be followed to ensure proper boiler start up?
1. The plumbing code
2. The gas code
3. The boiler manufacturer
4. The general contractors recommendations

A

The boiler manufacturer

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17
Q

Flow rate, temperature drop and pressure drop are used to size what?

A

The size of the piping.

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18
Q

What must be known in order to properly size the output of a pump for a hydronic heating system?

A

Required GPM and the total feet of head

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19
Q

What is the main function of an expansion handling device?

A

To allow the water in the system to expand and contract as the system water heats and cools

20
Q

How do diaphragm tanks differ from standard closed expansion tanks?

A

Diaphragm tanks have a bladder that separates the water and air.

21
Q

In what section of the heating code will you find definitions?

A

Section 2

22
Q

In which section of the heating code is quality of work referenced?

A

Section 3

23
Q

Which section in the heating code deals with hydronic space heating?

A

Section 12

24
Q

What is covered in section 15 of the heating code?

A

Auxiliary systems

25
Q

What must be selected prior to installing rough in piping?

A

The heat transfer units

26
Q

Why does ASHRAE not recommend the use of high output baseboard?

A

High output baseboard reduces comfort by not covering enough exposed wall.

27
Q

What is the best location for installing baseboard fin?

A

On exterior walls with or without windows

28
Q

Which reference material will best assist in the installation of baseboard fin and cabinet?

A

Manufacturers specifications.

29
Q

Prior to making a material list, it is good practice to do which?
1. Make a detail drawing showing piping materials and parts.
2. Consult the GC.
3. check the plumbing code

A

Make a detail drawing showing piping materials and parts.

30
Q

What is the name of the type of heat loss for the amount of heat flowing from inside to outside?

A

Transmission heat loss.

31
Q

What unit is transmission heat loss calculated in?

A

BTU

32
Q

What is mechanical ventilation?

A

A form of infiltration. Air that is removed from the building or kitchen exhaust fans must be replaced as to prevent a negetive pressure from forming within the building. This must be added to the heat loss calculation.

33
Q

The I=B=R net rating is the amount of heat energy that will be transmitted to the hot water from the input fuel after losses are taken into account. True or false?

A

True.

34
Q

What info is shown by the boiler’s manufacturer?

A

The input rating of the boiler, the output rating and the I=B=R net rating.

35
Q

What is the “input rating” of a boiler?

A

The amount of fuel the boiler will consume in 1 hour.

36
Q

What is the “output rating “ of a boiler?

A

The total BTU a boiler produces after stack and jacket losses are removed.

37
Q

An oversized boiler is quite inefficient. True or false?

A

True, it will start and stop frequently, allowing a great deal of heat to pass up the stack and is wasted.

38
Q

What is the recommended flow rate when determining friction loss, in most residential or small commercial applications?

A

Between 2-4 GPM to ensure laminar flow and a quiet system.

39
Q

What material pump body should be utilized if the system contains high oxygen levels?

A

Brass or stainless.

40
Q

What is the main function of the piping in a heating system?

A

To deliver heated water to the HTUs at a reasonable flow rate in order to maintain a set temperature drop.

41
Q

What can occur in a piping system if expansion and contraction of the piping is not accounted for in the design?

A

Excessive pressure on the entire system, possible resulting in component damage as water is not compressible.

42
Q

What are the two different types of expansion tanks?

A

Open and closed.

43
Q

For conventional expansion tanks, what is the industry rule of thumb for the capacity of the tank?

A

No less than 1 US gallon for each 5000 BTU of total heat loss.

44
Q

For diaphragm expansion tanks, what is the industry rule of thumb for the capacity of the tank?

A

No less than 1 US gallon for each 7000 BTU of total heat loss.

45
Q

Where is an open expansion tank located?

A

The highest point in the heating system.

Danica’s Steamfitter III Review (12 decks)

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