Lesson 2: Refrigeration System

Question 1

INTRODUCTION

The field Refrigeration and air conditioning are ________________, but each also has its own province.

Answer 1

interconnected

Question 2

INTRODUCTION

________________ is the process of cooling to provide human comfort while ______________ (Industrial refrigeration) is use for food preservation; removing heat from substances in chemical, petroleum, and petrochemical plants; and numerous special applications such as those in the manufacturing and construction industries.

Answer 2

Air conditioning, refrigeration

Question 3

Give the similarity and differences of air conditioning and refrigeration

Answer 3

Aircon: Heating, humidifying, and control of air quality

Similarity: Cooling and dehumidifying operations in air conditioning

Refrigeration: Industrial Refrigeration, including food preservation. chemical, and process industries

Question 4

5 Applications of refrigeration system

Answer 4

1. Food storage and distribution
2. Storage
3. Distribution
4. Food processing
5. Chemical and Process industries

Question 5

5 Methods of refrigeration

Answer 5

1. Ice refrigeration
2. Mechanical refrigeration
3. Absorption refrigeration
4. Steam jet or vacuum refrigeration
5. Air cycle refrigeration

Question 6

METHODS OF REFRIGERATION

A refrigeration method of lowering and maintaining the temperature of a material or space by the use of a literal ice (water or other substance, say dry ice).

Answer 6

Ice refrigeration

Question 7

METHODS OF REFRIGERATION

A method of refrigeration using mechanical components composing a system known as vapor compression refrigeration system.

Answer 7

Mechanical refrigeration

Question 8

METHODS OF REFRIGERATION

A method of refrigeration through the use of a system or cycle known as Absorption Refrigeration System or cycle.

Answer 8

Absorption refrigeration

Question 9

METHODS OF REFRIGERATION

A method of refrigeration system using water as refrigerant; lowering and maintaining of system temperature is attained by creation of vacuum condition through the action of steam jet.

Answer 9

Steam jet or vacuum refrigeration

Question 10

METHODS OF REFRIGERATION

A method of refrigeration using air as refrigeration; the system is normally called as ______________________ system.

Answer 10

Air cycle refrigeration

Question 11

Is a branch of science that deals with the process of reducing and maintaining the temperature of space or material below the temperature of the surroundings.

Answer 11

Refrigeration

Question 12

Is used to describe thermal systems that maintain process space or material at a temperature less than available from ambient conditions.

Answer 12

Refrigeration

Question 13

The largest application of refrigeration which is the process of cooling is for_____________________. Refrigeration embraces ____________________ including the processing and preservation of food, removing heat from substances in chemical, petroleum and petrochemical plants and numerous special applications such as those in the manufacturing and construction industries.

Answer 13

air conditioning, Industrial Refrigeration

Question 14

4 Basic Components of Refrigeration

Answer 14

1. Evaporator
2. Condenser
3. Expansion valve or capillaries
4. Compressor

Question 15

4 BASIC COMPONENTS OF REFRIGERATION

Are low-pressure vapor heat exchanger.

Answer 15

Evaporator

Question 16

> Located in the freezer compartment of the refrigerator.

Answer 16

evaporator

Question 17

EVAPORATOR

• ___________ forms the coldest part of the cabinet with a temperature of about _____°C, while the refrigerant evaporates inside the evaporator tubes at ____°C. Just below the Freezer, there is a ____________.

Answer 17

freezer, -15, -25, chiller tray

Question 18

EVAPORATOR

• Temperature maintained in the freezer is about -15°C whereas the mean temperature inside the cabinet is ___°C.

Answer 18

7

Question 19

BASIC COMPONENTS OF REFRIGERATION

Are high-pressure vapor heat exchangers.

Answer 19

Condenser

Question 20

CONDENSER

• The design of the condenser is usually a wire and tube or plate tube type mounted at the back of the refrigerator.
• There is no fan.
• The refrigerant vapor is condensed with the help of surroundings air which rises above by natural convection as it gets heated after receiving the latent heat of condensation from the refrigerant.
• Standard condensing temperature is ____°C.

Answer 20

55

Question 21

BASIC COMPONENTS OF REFRIGERATION

The throttling devices that transport refrigerant from high-pressure condition (Condenser) to low pressure condition (Evaporator).

Answer 21

Expansion valve or capillaries

Question 22

BASIC COMPONENTS OF REFRIGERATION

Are pressure raising devices.

Answer 22

Compressor

Question 23

The following temperatures standard design temperature conditions are applicable for a vapor-compression refrigeration system.

• Evaporation Temperature : 5°F = - ____°C
• Condensing Temperature: 86 °F = ____°C

Answer 23

• 5°F = - 15°C
• 86 °F = 30°C

Question 24

is a cycle that receives heat from a colder and delivers heat to a hotter body, not in violation of the second law, but by virtue of a work input.

Answer 24

Reverse Cycle

Question 25

Are cycles used to pump heat from low to high temperature regions: or cycles with the objective of extracting heat from low temperature reservoir.

Answer 25

Refrigeration Cycles

Question 26

Devices that operate in a cycle and transfer heat from a low-temperature region to a high-temperature region with work input to the system.

Answer 26

Heat Pump and Refrigeration

Question 27

A cycle with the objective of supplying heat to the high temperature reservoir

Answer 27

Heat Pump

Question 28

A body with the large heat capacity such that when heat is removed or added to the reservoir the temperature of the reservoir does not change.

Answer 28

Thermal Reservoir

Question 29

It is a fluid used for energy exchanges in a refrigerating or heat pump system.

Answer 29

Refrigerant

Question 30

It was one of the earliest refrigerants and was widely used whenever a completely nontoxic medium was needed

Answer 30

Air refrigerant

Question 31

It is one of the oldest and most widely used of all the refrigerants

Answer 31

Ammonia

Question 32

It is a colorless and odorless gas, and is heavier than air.

Answer 32

Carbon Dioxide

Question 33

It is colorless liquid with a faint, sweet, nonirritating odor.

Answer 33

Methyl Chloride

Question 34

a component used to evaporate liquid refrigerant while absorbing heat from the surrounding

Answer 34

Evaporator

Question 35

a component that condenses refrigerant vapor while rejecting heat to a cooling medium (either air or water)

Answer 35

Condenser

Question 36

a component used to compress refrigerant vapor that causes the refrigerant to flow in the system.

Answer 36

Compressor

Question 37

a component that reduces the pressure of the refrigerant in order to attain low temperature condition in the evaporator.

Answer 37

Expansion valve