Air Conditioning.

Front 1

What year did the Montreal protocol take effect?

Back 1

1996

Front 2

What happened in 1996

Back 2

Montreal Protocol

Front 3

What is the Montreal protocol?

Back 3

International Agreement covering use of ozone depleting chemicals.

Front 4

Define: Refridgerant

Back 4

Fluid that absorbs or gives off heat

Front 5

Define: Latent Heat

Back 5

The amount of heat required to change the state of matter without changing its temperature.

Front 6

Define: Sensible Heat

Back 6

Changes temperature of matter

Front 7

What state is refrigerant in at atmospheric pressure?

Back 7

Usually a gas at atmospheric pressure

Front 8

What happens to refrigerant during changing state?

Back 8

Will absorb or give off heat

Front 9

What are two common refrigerants?

Back 9

Freon, Propane

Front 10

Latent heat of fusion/freezing?

Back 10

Solids change to liquid / liquid changes to solid

Front 11

Latent Heat of vaporization?

Back 11

Liquids changes to Vapour

Front 12

Latent Heat of Condensation?

Back 12

Vapour changes to liquid

Front 13

Latent heat of sublimation

Back 13

Solid changes directly to vapour.

Front 14

Define: BTU

Back 14

The amount of heat required to raise the temperature of one pound of water one degree fahrenheit at sea level.

Front 15

Name three methods of heat transfer.

Back 15

1. Conduction
2. Radiation
3. Convection

Front 16

How does conduction heat transfer work?

Back 16

Transfer between parts of a substance

Front 17

How does Radiation heat transfer work?

Back 17

Transfer through a medium or vacuum by waves or electrons.

Front 18

How does convection heat transfer work?

Back 18

Transfers by circulation due to temperature differences.

Front 19

Does the Cold go to the Heat, or the Heat goes to the Cold?

Back 19

Heat goes to the Cold

Front 20

What is a saturated liquid?

Back 20

Liquid at such a temperature that any added heat will change it to a vapour.

Front 21

What is a Saturated Vapour?

Back 21

Vapour at such a temperature and pressure that with the removal of any heat it will condense.

Front 22

What is Sub-Cooled Liquid?

Back 22

Liquid at a temperature below the saturation point.

Front 23

What is Super-heated Vapour?

Back 23

Vapour that is above the saturation temperature.

Front 24

What are the 10 Refrigeration Components?

Back 24

1. Compressor 2. Discharge Line

3. Condensor 4. Liquid Line

5. Metering Device 6. Expansion Valve

7. Evaporator 8. Suction Line

9. Low Side 10. High Side

Front 25

What are the six forms of energy?

Back 25

Radiant

Chemical

Mechanical

Electrical

Nuclear

Thermal

Front 26

What two types of heat of concern in refrigeration systems?

Back 26

Sensible Heat and Latent Heat.

Front 27

What is sensible heat?

Back 27

The Heat that will change the temperature, without causing a change in state.

Front 28

What is Latent Heat?

Back 28

Heat that causes a change of state without a change in temperature.

Front 29

How Many BTU's of heat will it take to change 1lb of 0°c Ice to 0°c water?

Back 29

144 BTU/HR

Front 30

Latent Heat of freezing is?

Back 30

The amount of heat needed to be extracted to cause water to freeze.

Front 31

Heat cannot be destroyed, it can only be transferred from one place to another.

True or False?

Back 31

True

Front 32

List four types of refrigeration equipment

Back 32

1. Thermoelectric
2. Absorption
3. Air Cycle
4. Compression Cycle

Front 33

List four types of AC used in RV's

Back 33

1. Rooftop
   
2. Splitsystem
3. Heat Pumps
4. Packaged Basement A/C

Front 34

First Law of thermodynamics states?

Back 34

Energy Cannot be created or destroyed.

Front 35

Second law of thermodynamics states?

Back 35

Heat always moves from hot to cold.

Front 36

List Six forms of energy

Back 36

1. Mechanical
   
2. Chemical
3. Radiant
4. Electrical
5. Heat
6. Nuclear

Front 37

Which energy causes matter to move?

Back 37

Mechanical Energy

Front 38

Which energy is transferred through space?

Back 38

Radiant Energy

Front 39

Which energy produces molecular motion?

Back 39

Heat Energy

(Thermal)

Front 40

Which energy consisting of electrons and protons?

Back 40

Electrical Energy

Front 41

Which two types of heat are we concerned about with refrigeration systems?

Back 41

1. Sensible Heat
2. Latent Heat

Front 42

Identify three methods of heat transfer?

Back 42

1. Conduction
2. Radiation
3. Convection

Front 43

Which type of heat is transferred by waves?

Back 43

Radiation

Front 44

Which type of heat flows from one place to another by way of fluid or air?

Back 44

Convection

Front 45

Substance that conduct heat poorly are called?

Back 45

Insulators

Front 46

Liquid that is at such a temperature and pressure that if any amount of heat is added, some of the liquid will change to vapor is called?

Back 46

Saturated Liquid

Front 47

The process of liquid changing to vapor is called?

Back 47

Evaporation

Front 48

Vapour that is at such a temperature and pressure that, if any heat is removed some of the vapour will turn to liquid, is called?

Back 48

Saturated Vapour

Front 49

The process of liquid changing to vapor is called?

Back 49

Evaporation

Front 50

Refrigerant changes from liquid to low-pressure vapor at the?

Back 50

Evaporator

Front 51

Refrigerant changes from a low-pressure vapor to a high-pressure vapor at the?

Back 51

Compressor

Front 52

Refrigerant changes from a high-pressure vapor to a high-pressure liquid at the?

Back 52

Condenser Coil

Front 53

In an air conditioner unit, the component in which the heat is absorbed from the living area is?

Back 53

Evaporator

Front 54

In an air conditioner unit, the refrigerant forces heat to the _______ air in the _________

Back 54

In an air conditioner unit, the refrigerant forces heat to the outside air in the condensor.

Front 55

The main component of a heat pump that allows the heat pump to heat or cool is the?

Back 55

Reversing Valve

Front 56

Refrigerants have been responsible for negative effects on the atmosphere known as?

Back 56

Ozone Layer Depletion

Front 57

The proper operation of any RV Air conditioner system is highly dependent upon proper ______ and _______ of indoor and outdoor air circulation through the _________

Back 57

The proper operation of any RV Air conditioner system is highly dependent upon proper volume and temperature of indoor and outdoor air circulation through the coils.

Front 58

The reason A/C seem to quit cooling is

________ and _________

Back 58

The reason A/C seem to quit cooling is Electrical Problems

and

Insufficient Evaporator Airflow

Front 59

What is the medium being transferred in an air conditioning system?

Back 59

Heat

Front 60

What is the Latent heat of vaporization for r22?

Back 60

90 BTU/LB

Front 61

What is the ozone depletion ratio for r22?

Back 61

0.05 %

Front 62

How would you check to see if a compressor is okay?

Back 62

Amp Draw & Ohmmeter

Front 63

Is the start relay normally open or closed?

Back 63

Closed.

Front 64

Could a compressor be faulty if all you measure was continuity?

Back 64

Yes

Front 65

Should a compressor compress liquid?

Back 65

NO - Vapour Only.