Heat Loss Calculation

Question 1

What is the primary purpose of a heating system?

Answer 1

To provide comfort to the individuals in the space.

Question 2

Which direction does heat always travel in?

Answer 2

From warm objects to cooler objects.

Question 3

What is not considered when calculating heat loss?

Answer 3

Interior walls of the building

Question 4

ODT is an acronym for:

Answer 4

Outdoor design temperature

Question 5

What does the designed temperature difference refer to?

Answer 5

The indoor temperature minus the outdoor temperature.

Question 6

What is the recommended practise for determining room dimensions?

Answer 6

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

Question 7

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?

Answer 7

Infiltration losses

Question 8

Which of the heat loss types transfers through a ceiling?

Answer 8

Transmission losses

Question 9

Finned baseboard heating capacity is expressed in what unit?

Answer 9

BTU per hour per linear foot

Question 10

Which type of application are kickspace heating units ideal for?

Answer 10

Limited wall space due to cabinets and cupboards.

Question 11

What are the three major components of a finned baseboard?

Answer 11

Radiant fin, housing and supply tube

Question 12

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

Answer 12

To slow or increase the convection air flow

Question 13

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

Answer 13

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

Question 14

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

Answer 14

Supply water temperature and GPM

Question 15

What causes frequent cycling of a boiler?

Answer 15

A boiler with excessive pressure.

Question 16

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

Answer 16

The boiler manufacturer

Question 17

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

Answer 17

The size of the piping.

Question 18

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

Answer 18

Required GPM and the total feet of head

Question 19

What is the main function of an expansion handling device?

Answer 19

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

Question 20

How do diaphragm tanks differ from standard closed expansion tanks?

Answer 20

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

Question 21

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

Answer 21

Section 2

Question 22

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

Answer 22

Section 3

Question 23

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

Answer 23

Section 12

Question 24

What is covered in section 15 of the heating code?

Answer 24

Auxiliary systems

Question 25

What must be selected prior to installing rough in piping?

Answer 25

The heat transfer units

Question 26

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

Answer 26

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

Question 27

What is the best location for installing baseboard fin?

Answer 27

On exterior walls with or without windows

Question 28

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

Answer 28

Manufacturers specifications.

Question 29

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

Answer 29

Make a detail drawing showing piping materials and parts.

Question 30

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

Answer 30

Transmission heat loss.

Question 31

What unit is transmission heat loss calculated in?

Answer 31

BTU

Question 32

What is mechanical ventilation?

Answer 32

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.

Question 33

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?

Answer 33

True.

Question 34

What info is shown by the boiler’s manufacturer?

Answer 34

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

Question 35

What is the “input rating” of a boiler?

Answer 35

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

Question 36

What is the “output rating “ of a boiler?

Answer 36

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

Question 37

An oversized boiler is quite inefficient. True or false?

Answer 37

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

Question 38

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

Answer 38

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

Question 39

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

Answer 39

Brass or stainless.

Question 40

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

Answer 40

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

Question 41

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

Answer 41

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

Question 42

What are the two different types of expansion tanks?

Answer 42

Open and closed.

Question 43

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

Answer 43

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

Question 44

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

Answer 44

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

Question 45

Where is an open expansion tank located?

Answer 45

The highest point in the heating system.