Transcription of The Pressure - Enthalpy Chart
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The Pressure - Enthalpy Chart
How often have you heard the statement it isn t cooling? Well it may seem a bit picky, but it is not entirely accurate tosay the refrigeration system cools . If the system is operatingproperly, the refrigerated space should be cooler than its sur-roundings, but it is the result of a heat transfer process. Heat istransferred from the refrigerated space to the refrigerant, andultimately from the r efrigerant to the ambient (at the condens-er). A lower temperature in the refrigerated space is thebyproduct of this heat transfer process. Perhaps this is a minorshift in thinking, but in viewing the refrigeration system forwhat it heat transfer more fundamentalapproach for diagnosis may be an effort to gain a better understanding of the various heattransfer processes o ccurring in a refrigeration system, the pres-sure- Enthalpy Chart can be of great use.
The pressure-enthalpy chart, as shown in Fig. 2, displays all the pertinent properties for a given refrigerant (in this example R22). The bubble to the left is the portion of the diagram where the refrigerant is in the saturated condition. The blue line on the left of the bubble represents the 100% saturated liquid line,
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