Refrigeration%20Cycle%20Notes

Refrigeration%20Cycle%20Notes - The obvious: Refrigeration...

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1 Refrigeration affects many areas of your life The obvious: Refrigerator/Freezers allow food preservation Air conditioning makes Texas inhabitable between July 4 and mid-September Refrigerated fishing boats allow preservation of catch Refrigerated trucks are used to ship fruits/meats Refrigeration makes possible medical procedures that call for lowering body temperatures
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2 Carnot (Power) Cycle Review Reversible isothermal expansion Reversible adiabatic expansion Reversible isothermal compression Reversible adiabatic compression Appears as rectangle on Ts diagram
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3 Carnot (Power) Cycle Review
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4 Carnot Cycle The Carnot Power Cycle is the most efficient cycle that can be operated between two temperature limits. It is completely reversible. Reversing it yields the Carnot Refrigeration Cycle.
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5 Reversed Carnot Cycle
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6 Reversed Carnot Cycle
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7 Reversed Carnot Cycle Just as for the Carnot Power Cycle, the reversed Carnot Cycle is very difficult to achieve in practice Isothermal heat transfer is easy under the vapor dome But there are losses so it is not reversible
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8 Reversed Carnot Cycle Adiabatic compression of a vapor-liquid mixture of high quality virtually is impossible Adiabatic expansion of a high moisture content mixture virtually is impossible The processes would be irreversible
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9 Reversed Carnot Cycle The Reversed Carnot Cycle is useful as a standard for comparison of other refrigeration cycles because it is the most efficient (highest COP) operating between two temperature levels.
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10 Reversed Carnot Cycle 1 T T 1 COP L H Carnot R, - = H L Carnot HP, T T 1 1 COP - =
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11 What we call a refrigeration cycle depends on its function
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12 Schematic of the cycle
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13 Four processes in cycle Isentropic compression (1 to 2) Constant pressure condensation (2 to 3) Isenthalpic expansion (3 to 4) Constant pressure evaporation (4 to 1)
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14 Refrigeration cycles are often displayed on pressure-enthalpy diagrams
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This note was uploaded on 01/03/2011 for the course MEEN 315 taught by Professor Ramussen during the Fall '07 term at Texas A&M.

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Refrigeration%20Cycle%20Notes - The obvious: Refrigeration...

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