Lesson 2

Question 1

is the process of cooling to provide human comfort

Answer 1

Air conditioning

Question 2

is used 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

Refrigeration (Industrial refrigeration)

Question 3

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 3

REFRIGERATION

Question 4

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

Answer 4

REFRIGERATION

Question 5

APPLICATION OF REFRIGERATION SYSTEM

Answer 5

● Food storage and distribution
● Storage
● Distribution
● Food processing
● Chemical and Process Industries

Question 6

include the manufacturers of chemicals, petroleum refiners, petrochemical plants, paper and pulp industries that require good engineering for their refrigeration.

Answer 6

Chemical and Process Industries

Question 7

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

Answer 7

Ice Refrigeration

Question 8

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

Answer 8

Mechanical Refrigeration

Question 9

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

Answer 9

Absorption Refrigeration

Question 10

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 10

Steam Jet or Vacuum Refrigeration

Question 11

A method of refrigeration using air as refrigeration; the system is normally called the
Air Cycle Refrigeration system.

Answer 11

Air Cycle Refrigeration

Question 12

FOUR BASIC COMPONENTS OF REFRIGERATION

Answer 12

● Evaporator
● Condenser
● Expansion Valve or Capillaries
● Compressor

Question 13

Are low-pressure vapor heat exchangers.

Answer 13

Evaporator

Question 14

Located in the freezer compartment of the refrigerator

Answer 14

Evaporator

Question 15

forms the coldest
part of the cabinet with a temperature of about -15℃

Answer 15

Freezer

Question 16

Just below the Freezer, there is a

Answer 16

Chiller Tray

Question 17

Are high-pressure vapor heat exchangers.

Answer 17

Condenser

Question 18

Standard condensing temperature

Answer 18

55℃

Question 19

The throttling devices that transport refrigerant from high-pressure condition to low pressure condition

Answer 19

Expansion Valve or Capillaries

Question 20

Are pressure raising devices.

Answer 20

Compressor

Question 21

Is the rate of cooling required to freeze one ton of water at 32 ℉ into ice at 32 ℉ in one day or 24 hr.

Answer 21

Tons of Refrigeration (TR)

Question 22

Standard evaporation temperature for a
vapor-compression refrigeration system.

Answer 22

5°F = -15℃

Question 23

Standard condensing temperature for a
vapor-compression refrigeration system.

Answer 23

86°F = 30℃

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 reservoirs.

Answer 25

Refrigeration Cycles

Question 26

are 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

is a cycle with the objective of supplying heat to the high temperature reservoir.

Answer 27

Heat Pump

Question 28

is a body with a 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 impossible to construct a cycle device that will cause heat to be transferred from a low-temperature reservoir to a high-temperature reservoir without the input of work;

Answer 29

CLAUSIUS STATEMENT

Question 30

is a fluid used for energy exchanges in a refrigerating or heat pump system. It is the transport fluid that conveys the heat energy from the low-temperature to high-temperature level where it can in terms of heat transfer give up its heat.

Answer 30

Refrigerants

Question 31

is an international agreement that took effect in 1989, and the New Clean Air Act that was signed in 1990, that limit the production and regulate the use and disposal of chlorofluorocarbon (CFC) refrigerants.

Answer 31

Montreal Protocol

Question 32

HCFC

Answer 32

Hydrochlorofluorocarbon

Question 33

HFC

Answer 33

Hydrofluorocarbon

Question 34

CFC

Answer 34

Chlorofluorocarbon

Question 35

ODP

Answer 35

Ozone Depletion Potential

Question 36

GWP

Answer 36

Global Warming Potential

Question 37

is the ozone destroying power of a substance measured relative to refrigerant 11

Answer 37

Ozone Depletion Potential

Question 38

is a relative measure of the ability of a substance to cause an increase in the temperature of the atmosphere by absorbing solar and earth radiation that is relative to the effect of refrigerant 11.

Answer 38

Global Warming Potential

Question 39

DESIRABLE THERMAL PROPERTIES OF THE REFRIGERANTS

Answer 39

● Convenient evaporation and condensation pressures. ● High critical and low freezing temperatures. ● High latent heat of evaporation ang high vapor specific heat. ● Low viscosity and high film heat conductivity.

Question 40

SAFETY CHARACTERISTICS

Answer 40

● Non-flammability ● Non-toxic ● Non-irritability

Question 41

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

Answer 41

Air refrigerant

Question 42

It is used for aircraft refrigeration systems.

Answer 42

Air refrigerant

Question 43

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

Answer 43

Ammonia

Question 44

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

Answer 44

Carbon Dioxide

Question 45

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

Answer 45

Methyl Chloride

Question 46

Is a mechanical refrigeration system, which has four basic components, namely: evaporator, compressor, condenser, and expansion valve.

Answer 46

VAPOR-COMPRESSION REFRIGERATION SYSTEM