Chapter 100- Warm Air Heating System Equipment

Question 0

List features about the lowboy furnace

Answer 0

Used where head room is limited
Cool return air is drawn from top of furnace
1.2 m tall

Question 1

Three types of heating sources

Answer 1

Directly fired
Electric resistance coil
Fin coil heat exchanger

Question 2

List features of the horizontal furnace

Answer 2

Blower is behind heat exchanger
0.6 m tall
For locations with limited headroom

Question 3

List features of the highboy or up flow furnace

Answer 3

Blower is underneath heat exchanger blowing upward

Question 4

How does an electrician air furnace work

Answer 4

The cool air is heated by passing it over a set of open resistance heating elements

Question 5

How are electric resistance coils temperature controlled

Answer 5

The power supply is controlled by a multi stage thermostat

Question 6

Main disadvantage of electric resistance coils

Answer 6

High energy cost

Question 7

Fin coil heat exchangers work by

Answer 7

A boil puts steam or hot water through finned coils in the duct system to heat the air

Question 8

What is a space heater

Answer 8

A heater installed to heat an area without the use of ducting

Question 9

Three types of space heaters

Answer 9

Unit heater
Floor heater
Wall furnace

Question 10

What is a unit heater

Answer 10

Air is forced through a heat exchanger by a propeller type fan, no filters,

Question 11

What is a floor furnace

Answer 11

Similar in construction to a upflow furnace

Air is drawn into blower compartment, then discharged through one or more blower cowls

Question 12

Wall furnace is a

Answer 12

Nearly identical to floor furnace

Recessed into wall to save floor space

Question 13

What is the average fuel efficiency of a furnace

Answer 13

70 - 75%

Question 14

A high efficiency furnace has a fuel efficiency of

Answer 14

80-98%

Question 15

Pulse combustion is used to

Answer 15

Achieve near perfect combustion

Question 16

A secondary heat exchanger uses ________ to improve efficiency 3

Answer 16

Secondary heat exchanger
Induced draft blower
Intermittent spark ignition and electronic contro

Question 17

What is the average tempurature that flue gasses leave the primary heat exchanger?

Answer 17

230- 250 degrees Celsius

Question 18

What temperature does flue gas leave the secondary heat exchanger

Answer 18

65 degrees Celsius

Question 19

What is the pulse combustion with secondary heat recoveries efficiency?

Answer 19

94-98%

Question 20

What form the primary heat exchanger on a pulse combustion system

Answer 20

The chamber, tailpipe, and decoupler

Question 21

How often is the pulse combustion process repeated?

Answer 21

60-70 times per second

Question 22

How does the pulse combustion work?

Answer 22

Cool air return is passed over the secondary heat exchanger first, then over the primary heat exchanger in order to receive the maximum amount of heat from the furnace

Question 23

What’s the pointless part about learning pulse combustion?

Answer 23

They are no longer manufactured

Question 24

Advantages of forced air circulation

Answer 24

Positive pressure more uniform heat cable obtained Ducts are smaller than a gravity system Furnace cable located in any part of the building Air may be cleaned by filters Air may be humidified Ability to control quantity of external ventilation air

Question 25

Disadvantages of forced air circulation

Answer 25

Air ducts are much larger this team or hot water heating systems Noisy if not properly designed