Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

NHIE > Cooling System > Flashcards

Cooling System Flashcards

1
Q

What does SEER stand for?

A

Seasonal energy efficiency ratio

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the amount of water vapor that an air-conditioning system must remove from air inside a house before the system can begin removing sensible load heat?

A

Latent Load

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the amount of heat energy that an air conditioning system must remove from the air inside of a home because of the temperature of the air?

A

Sensible load

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the minimum allowed SEER for most of the United States?

A

14

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the seer rating on a older systems?

A

Ten

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are two air conditioning systems inspectors should disclaim?

A

Radiant cooling systems
and
absorption coolers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What kind of air-conditioning equipment may be encountered as refrigerators in off grid houses or any other places where electricity is difficult for costly to obtain?

A

Absorption coolers

Absorption systems use natural gas, propane, or renewable energy for fuel. They use ammonia as a refrigerant and an absorber in place of compressor.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Heat energy flows from someplace ____ going to someplace ______.

A

Hotter

Colder

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Water vapor in the air flows (diffuses) from a place with _____ water vapor to a place with ______ water vapor.

A

More

Less

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Can more water vapor exist in warm air than in cool air?

A

Warm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the stack effect?

A

Hotter air is lighter than cooler air and will rise

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What takes a lot more energy?
1- To change matter from one state to another or
2- To raise the temperature of matter within a state.

A

One, to change matter from one state to another.

For example: solid to a liquid or liquid to a gas, (or vice versa)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What must be removed in order to change matter from a gas to a liquid and a liquid to a solid?

A

Energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Energy must be (added or removed) to change matter from a solid to a liquid and from a liquid to a gas?

A

Added

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The first step in the cooling cycle of an air conditioning system is…

A

The compressor receives cool gas refrigerant at low pressure from the evaporator coil.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

In the cooling cycle of an air conditioning system what does the compressor do?

A

It changes the cool gas refrigerant at low pressure into a super heated gas and high pressure.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

In the cooling cycle of an air conditioning system, liquid refrigerant flows in a liquid line _____ towards the evaporator coil.

A

Under high pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

In the cooling cycle of an air conditioning system, what does the metering device do?

A

Reduces the liquid temperature and pressure and the some of the liquid flashes into a gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

In the cooling cycle of an air conditioning system, what happens to the liquid refrigerant in the evaporator coil?

A

The liquid expands as it flows through the evaporator coil tubes.

As a liquid in the evaporator coils expand, it absorbs heat from the air inside the house.

The absorbed heat causes the liquid to boil and changes into a cool gas at low pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

When you see a reversing valve inside the condenser cabinet what does that infer?

A

That is a heat pump

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

In a heat pump air conditioning system, what roles do the condenser and evaporator play?

A

The roles are reversed depending on the heating or cooling cycle.

The outside condenser acts like an evaporator coil

The inside evaporator acts like a condensing coil

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

How long does it take a air conditioner to reach peak efficiency?

A

Ten to 20 minutes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

If an air conditioning system is too large and is short cycling what function may not be performed?

A

Dehumidification

24
Q

At What outside temperature should a inspector not test the air conditioner?

A

60 degrees or below

25
Q

What are the two risks of operating an air conditioner below 60°?

A

Slugging the compressor

In accurate or misleading test results

26
Q

If environmental conditions are favorable the home inspector may elect activate the system using thermostat. How long should the system operate for maximum effectiveness?

A

10 to 20 minutes

27
Q

What is the safe range of outdoor temperature when testing heat pumps?

A

Between 60 and 80°

28
Q

When testing a heat pump, how long should you wait between heating and cooling mode?

A

About five minutes

29
Q

The package system may be in an air conditioning system and a gas powered furnace, what is that called?

A

Gas pack

30
Q

When inspecting replacement condensers in an air conditioning system, What should the inspector be concerned about?

A

Using components from a different manufacturer

Overcurrent protection device, OPD, may be oversized because new condenser’s require less electricity

31
Q

What is the typical condenser unit service life?

A

15 years

Five years in salt water environment

32
Q

Evaporative coolers are mechanical air intake sources. As such, how far should they be away from contaminant sources such as plumbing vents appliance vents and chimneys?

A

2- 3- 10 rule

10 feet horizontal or 3 feet below

33
Q

Should home inspectors report that a normal temperature drop measurement indicates the system is operating as tended?

A

No

34
Q

Many home inspectors believe the acceptable dry climate temperature drops is?

A

18° to 24°

15° to 20° for humid climates

35
Q

Service access inspection, what is the minimum finished attic access opening size?

A

20 x 30”

Keyword finished

36
Q

Service access inspection, the minimum finished crawlspace access opening size is?

A

22 x 30”

Keyword crawlspace

37
Q

Appliances located in attic’s should be located within how many feet of the access opening?

A

20 feet

38
Q

Appliances located in attics should have a level service space of at least…

A

30” x 30”

39
Q

Service access inspection, what is the unobstructed path to the appliance in a crawl space?

A

22 inches wide and 30 inches high

Keyword crawlspace

40
Q

Service access inspection, how wide should the passageway be covered by floor sheeting in an attic?

A

24 inches

Keyword attic

This is different than a crawlspace which is only 22 inches

41
Q

The primary condensate disposal system pipe should be what diameter and slope?

A

¾ inch

1/8 inch per foot

42
Q

Auxiliary condensate management system, one system is a pan placed under the evaporator coil. What size should it be?

A

At least 1 1/2 inches deep and extend 3 inches beyond the evaporator coil on all sides

43
Q

Refrigerant line set, manufacturers recommend the maximum support spacing of….

A

8 feet

44
Q

Refrigerant lines set, recommend a maximum line set distance of… And maximum vertical distance of…

A

60 feet

25 feet

45
Q

Analog thermostat usually use…

A

A coil bi-metallic spring

46
Q

Air distribution system design, what is a common reason for temperature balancing problems between rooms?

A

Inadequate duct size

47
Q

Air distribution system design, what problems could result from deviations of the industry standards?

A

Increased HVAC system operating time and cost

Reduced HVAC system service life

Moisture control problems

48
Q

Air distribution system design, ducts or grills that connect the room to a central hallway return are sometimes called work?

A

Transfers or jumpers

49
Q

Air distribution system design, flex duck should be supported by…

A

1 1/2 inch material at least every 4 feet horizontally and every 6 feet vertically

50
Q

Air distribution system design, flexible duct support should not sag how many inches per foot?

A

½ inch

51
Q

Air distribution system design, must be supported before and after the bend by how much?

A

Support within 1 foot (or one duct diameter, which ever is smaller) on all sides of the bands and fittings.

52
Q

Bends in ductwork increase the effective length of a duct. For example, a 90° bend adds how many feet to the affect of length of a duct?

A

20 feet

53
Q

Return ducts and inlet, return units should not be located in the same room fuel burning appliances and within how many feet of these appliances?

A

10 feet

54
Q

Return ducts and inlet, should not be taken directly from…

A

Closet, bathroom, toilet room, kitchen, garage, furnace, or unconditioned attic or crawlspace

55
Q

Home inspectors should consider reporting as information when filters are located in places that are difficult or dangerous to access.
True or false

A

True

NHIE (11 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions