A refrigerator is a heat engine in which work is done on a refrigerant substance in order to collect energy from a cold region and exhaust it in a higher temperature region, thereby further cooling the cold region.
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How is a refrigerator an example of thermodynamics?
According to the Second Law of Thermodynamics, heat will always flow spontaneously from hot to cold, and never the other way around. A refrigerator causes heat to flow from cold to hot by inputting work, which cools the space inside the refrigerator.
What kind of system is a refrigerator?
Mechanical-Compression Refrigeration Systems By mechanically compressing refrigerant into a cold liquid with low pressure and expanding it into hot gas with high pressure, this type of system transfers heat. Refrigerants work when pressure is applied or removed.
What is refrigerator in physics class 11?
A refrigerator works on the principle of the second law of thermodynamics. This law is related to the extraction of heat from a body i.e. to lower the temperature of the body. The temperature of the body can be lowered by extracting or removing the heat from the material or the body.
Is a refrigerator conduction convection or radiation?
Refrigerators operate using convection by circulating the gas through the copper lines inside of the refrigerator or freezer compartment. The lines, and the gas contained within them, absorb the heat contained in the refrigerator and freezer compartments, and are circulated back outside of the unit.
What is refrigeration example?
Refrigeration is the process of cooling space. Refrigeration involves the process of removing heat from a body and cooling it to a lower temperature than the actual. Refrigerators are used for the refrigeration process.
Which thermodynamics process is present in refrigerator?
The convection is the most present process in the refrigeration equipment you may deal with. It occurs mainly in the fluids (Liquids and Gas).
What is conduction in refrigeration?
Conduction is heat traveling through a solid material. On hot days, heat is conducted into your home through the roof, walls, and windows. Heat-reflecting roofs, insulation, and energy efficient windows will help to reduce that heat conduction.
What is called refrigeration?
The term refrigeration refers to the process of removing heat from an enclosed space or substance for the purpose of lowering the temperature. Refrigeration can be considered an artificial, or human-made, cooling method.
What is heat refrigerator in thermodynamics?
Refrigerator Thermodynamics First: the Evaporator coil removes heat from the object. Second: there is an expansion valve that evaporates the gas. Third: A cold liquid gas is passed through the compressor. Fourth: Hot gas is disposed of in the surroundings.
Is a refrigerator a machine?
A refrigerator is a machine used for keeping things cold. It is sometimes called a fridge or an icebox. It is normally maintained at 4-5 degree Celsius for household use. People put food and drinks in it, to keep those items cold or good (unspoiled) for a longer time.
Why is it called a refrigerator?
The word refrigerator originates from the Latin verb refrigerare which was derived from the Latin adjective frigus, meaning cold.
What is Second Law of Thermodynamics class 11 physics?
The second law of thermodynamics states that any spontaneously occurring process will always lead to an escalation in the entropy (S) of the universe. In simple words, the law explains that an isolated system’s entropy will never decrease over time.
What is a refrigerator in physics class 12?
Refrigerator: A refrigerator is a Carnot’s engine working in the reverse order. As a result the cold reservoir (refrigerator) further cools down and the surroundings (kitchen or atmosphere) get hotter. Coefficient of performance (COP) (ฮฒ): COP is a measure of the efficiency of a refrigerator.
Is refrigerator a heat pump?
In other words, a heat pump attempts to cool down the air outside the building, and in the process heats up the air inside the building. Put differently, a refrigerator is simply a heat pump which takes heat from inside the refrigerator and transfers it outside the refrigerator.
Why is a refrigerator convection?
In a refrigerator, convection is used to circulate cold air around the food. Air is cooled by freezer compartment at the top of refrigerator. As it sinks, it is replaced by warmer air rising from below. The circulating air carries away heat energy from all the food in the fridge.
What is an example of heat radiation?
Radiation Examples The heat emitted by a radiator. Solar ultraviolet radiation, precisely the process that determines the Earth’s temperature. The light emitted by an incandescent lamp. The emission of gamma rays by a nucleus.
Is radiation applicable in refrigerator?
The vast majority of simple refrigerator units will only emit a small amount of radiation, and it is fairly localized, meaning the farther you are away the less radiation you will be exposed to. Unless the unit is on the opposite side of a wall that you are sleeping against, I would not worry about this very much.
Which law of thermodynamics does a cooling system apply?
Second Law: Refrigerator Second Law of Thermodynamics: It is not possible for heat to flow from a colder body to a warmer body without any work having been done to accomplish this flow. Energy will not flow spontaneously from a low temperature object to a higher temperature object.
What kinds of process can be found in refrigeration system?
- Natural Gas.
- Alkylation.
- Heat Exchanger.
- Heat Pump.
- Adsorption.
- Liquefied Natural Gas.
- Low-Temperature.
- Refrigeration System.
What is entropy in thermodynamics?
entropy, the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work. Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system.
Which of the following is the example of convection?
Everyday Examples of Convection boiling water – When water boils, the heat passes from the burner into the pot, heating the water at the bottom. This hot water rises and cooler water moves down to replace it, causing a circular motion.
What is conduction convection and radiation?
In conduction, heat transfer occurs between objects by direct contact. In convection, the heat transfer takes within the fluid. In radiation, heat transfer occurs through electromagnetic waves without involving particles. The heat transfer takes place due to the difference in temperature.
Why does object conduction occur?
Conduction occurs when two things at different temperatures touch each other and energy directly transfers from the material in the hotter object to the material in the colder object at the point of contact. A metal pot used to boil water on a stove top is an example of how heat is transferred through conduction.
What is a refrigerator answer?
A refrigerator, colloquially fridge, is a commercial and home appliance consisting of a thermally insulated compartment and a heat pump (mechanical, electronic or chemical) that transfers heat from its inside to its external environment so that its inside is cooled to a temperature below the room temperature.