Refrigeration:- Refrigeration is the science of the producing and maintaining temperature below that of the surrounding atmosphere.
Production of refrigeration:-
(a) By melting of a solid.
(b) By sublimation of a solid.
(c) By evaporation of a liquid.
Refrigeration system:-
1. Ice refrigeration system.
2. Air refrigeration system.
3. Vapour compression refrigeration system.
4. Vapour absorption refrigeration system.
5. Special refrigeration system:-
i. Adsorption refrigeration system.
ii. Cascade refrigeration system.
iii. Mixed refrigeration system.
iv. Votex tube refrigeration system.
v. Thermoelectric refrigeration system.
vi. Steam jet refrigeration system.
Heat engines, Refrigerators, Heat pumps:-
Heat engines:- A heat engine may be defined as a device that operates in a thermodynamic cycle and does a certain amount of net positive work through the transfer of heat from a high temperature body to a low temperature body. A steam power plant is an example of a heat engine.
Refrigerators:- A refrigerator may be defined as a device that operates in a thermodynamic cycle and transfers a certain amount of heat from a body at a lower temperature to a body at a higher temperature by consuming certain amount of external work. Domestic refrigerators and room air conditioners are the examples. In a refrigerator, the required output is the heat extracted from the low temperature body.
Heat pumps:- A heat pump is similar to a refrigerator, however, here the required output is the heat
rejected to the high temperature body.
Production of refrigeration:-
(a) By melting of a solid.
(b) By sublimation of a solid.
(c) By evaporation of a liquid.
Refrigeration system:-
1. Ice refrigeration system.
2. Air refrigeration system.
3. Vapour compression refrigeration system.
4. Vapour absorption refrigeration system.
5. Special refrigeration system:-
i. Adsorption refrigeration system.
ii. Cascade refrigeration system.
iii. Mixed refrigeration system.
iv. Votex tube refrigeration system.
v. Thermoelectric refrigeration system.
vi. Steam jet refrigeration system.
Heat engines, Refrigerators, Heat pumps:-
Heat engines:- A heat engine may be defined as a device that operates in a thermodynamic cycle and does a certain amount of net positive work through the transfer of heat from a high temperature body to a low temperature body. A steam power plant is an example of a heat engine.
Refrigerators:- A refrigerator may be defined as a device that operates in a thermodynamic cycle and transfers a certain amount of heat from a body at a lower temperature to a body at a higher temperature by consuming certain amount of external work. Domestic refrigerators and room air conditioners are the examples. In a refrigerator, the required output is the heat extracted from the low temperature body.
Heat pumps:- A heat pump is similar to a refrigerator, however, here the required output is the heat
rejected to the high temperature body.
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