Lesson 2: Refrigeration System Flashcards
INTRODUCTION
The field Refrigeration and air conditioning are ________________, but each also has its own province.
interconnected
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.
Air conditioning, refrigeration
Give the similarity and differences of air conditioning and refrigeration
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
5 Applications of refrigeration system
- Food storage and distribution
- Storage
- Distribution
- Food processing
- Chemical and Process industries
5 Methods of refrigeration
- Ice refrigeration
- Mechanical refrigeration
- Absorption refrigeration
- Steam jet or vacuum refrigeration
- Air cycle refrigeration
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).
Ice refrigeration
METHODS OF REFRIGERATION
A method of refrigeration using mechanical components composing a system known as vapor compression refrigeration system.
Mechanical refrigeration
METHODS OF REFRIGERATION
A method of refrigeration through the use of a system or cycle known as Absorption Refrigeration System or cycle.
Absorption refrigeration
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.
Steam jet or vacuum refrigeration
METHODS OF REFRIGERATION
A method of refrigeration using air as refrigeration; the system is normally called as ______________________ system.
Air cycle refrigeration
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.
Refrigeration
Is used to describe thermal systems that maintain process space or material at a temperature less than available from ambient conditions.
Refrigeration
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.
air conditioning, Industrial Refrigeration
4 Basic Components of Refrigeration
- Evaporator
- Condenser
- Expansion valve or capillaries
- Compressor
4 BASIC COMPONENTS OF REFRIGERATION
Are low-pressure vapor heat exchanger.
Evaporator
> Located in the freezer compartment of the refrigerator.
evaporator
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 ____________.
freezer, -15, -25, chiller tray
EVAPORATOR
- Temperature maintained in the freezer is about -15°C whereas the mean temperature inside the cabinet is ___°C.
7
BASIC COMPONENTS OF REFRIGERATION
Are high-pressure vapor heat exchangers.
Condenser
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.
55
BASIC COMPONENTS OF REFRIGERATION
The throttling devices that transport refrigerant from high-pressure condition (Condenser) to low pressure condition (Evaporator).
Expansion valve or capillaries
BASIC COMPONENTS OF REFRIGERATION
Are pressure raising devices.
Compressor
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
- 5°F = - 15°C
- 86 °F = 30°C
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.
Reverse Cycle
Are cycles used to pump heat from low to high temperature regions: or cycles with the objective of extracting heat from low temperature reservoir.
Refrigeration Cycles
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.
Heat Pump and Refrigeration
A cycle with the objective of supplying heat to the high temperature reservoir
Heat Pump
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.
Thermal Reservoir
It is a fluid used for energy exchanges in a refrigerating or heat pump system.
Refrigerant
It was one of the earliest refrigerants and was widely used whenever a completely nontoxic medium was needed
Air refrigerant
It is one of the oldest and most widely used of all the refrigerants
Ammonia
It is a colorless and odorless gas, and is heavier than air.
Carbon Dioxide
It is colorless liquid with a faint, sweet, nonirritating odor.
Methyl Chloride
a component used to evaporate liquid refrigerant while absorbing heat from the surrounding
Evaporator
a component that condenses refrigerant vapor while rejecting heat to a cooling medium (either air or
water)
Condenser
a component used to compress refrigerant vapor that causes the refrigerant to flow in the system.
Compressor
a component that reduces the pressure of the refrigerant in order to attain low temperature
condition in the evaporator.
Expansion valve
