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Physical and Chemical effects on surface

Operation of a sorption compressor is based on the principle that large amounts of gas can be adsorbed on certain solids such as highly porous carbon. The amount of gas adsorbed is a function of temperature and pressure. Physical and Chemical effects on surface.

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Physical and Chemical effects on surface

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  1. Operation of a sorption compressor is based on the principle that large amounts of gas can be adsorbed on certain solids such as highly porous carbon. The amount of gas adsorbed is a function of temperature and pressure.

  2. Physical and Chemical effects on surface Absorption is a Chemical phenomenon or a process in which atoms, molecules, or ions enter some bulk phase. Adsorption is the adhesion of molecules of gas, liquid, or dissolved solids to a surface. This is physical effect. Adsorption

  3. Typical gas - sorber combinations for sorption cryocoolers

  4. Working of Sorption Type Cryocooler • By nature, a sorption compressor element is an intermittent system in which the sorbent bed alternates between gas generation and adsorption. • By combining at least two sorbent beds in a single compressor and sequencing these sorbent beds out of phase, it is possible to produce a constant flow of gas through the cold stage and thus achieve continuous refrigeration.

  5. Working of Sorption Type Cryocooler • The compressor unit contains four sorption cells and two check valves fitted to each cell for controlling control the gas flows. • Sorption compressor type J-T cryocooler essentially consists of • Sorption type compressor • After cooler • Return gas heat exchanger • J-T expansion device

  6. Working of Sorption Type Cryocooler • Usually, heating occurs with an electrical heater and cooling is done by circulating water in a coil around the sorption cell

  7. Valve position in JT cryocooler

  8. Working of Sorption Type Cryocooler • The working fluid is initially heated in the Cell A for ¼ cycle. • Inlet Valve of A and Outlet Valve of C are opened. • The hot working fluid is cooled to room temperature in the after cooler. • The high pressure working fluid at room temperature enters the recuperative heat exchanger, where, it is cooled by the return gas. • The working fluid is then expanded Isenthalpically by passing through a J-T Valve. Resulting in reduction of temperature. • The low temperature working substance evaporates as it takes the heating load and produces refrigeration. • The working substance then enters the return gas heat exchange before getting adsorbed into the Cell C B C D A

  9. JT Sorption Type Cryocooler • The type of compression employed in sorption compressor cell is • Reciprocating type • Rotary Compressor • Adsorption type • None of the above

  10. JT Sorption Type Cryocooler • Pressure is developed due to • Adsorption • Absorption • Desorption • Sorption

  11. JT Sorption Type Cryocooler • Heat exchanger prior to JT valve is used to • Reduce the temperature before expansion • To increase the cop • To remove gaseous heat • For refrigeration effect

  12. JT Sorption Type Cryocooler • Adsorption is a ____? • Physical effect • Chemical effect • mostly physical , but in certain cases it is chemical • Neither physical nor chemical process

  13. JT Sorption Type Cryocooler • Desorption in a cell comprises of ____? • Compression • Expansion • Combined compression and expansion • Refrigeration

  14. Cryogenic Engineering By R Barrons http://www.cryomech.com/ http://www.che.cemr.wvu.edu/publications/projects/large_proj/air.PDF

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