Blends: Pbleshoot system opera- proper low- and …

26 RSES Journal~ March 2006 Pressure-temperature (PT)charts can be used to trou-bleshoot system opera -tion, specifically to checkproper low- and high-sidepressures, set superheatand subcooling temperatures, and toset pressure controls. The tempera-ture glide of a blend will determinehow the PT chart will look. Therefore, a quick review of tem-perature glide from last month s arti-cle is necessary: As a portion of a refrigerantblend works its way down the lengthof an evaporator tube, local fraction-ation of the liquid, asit boils, will cause theboiling temperatureto increase. The average evapo-rator temperature is the averagebetween the temperature where theblend begins boiling at the expan-sion device and where it stops boil-ing at the end of the evaporator. The average of the temperatureglide is used to compare to a singlerefrigerant s boiling point for pur-poses of having the same coil tem-perature.

26 RSES Journal~ March 2006 P ressure-temperature (PT)charts can be used to trou-bleshoot system opera-tion, specifically to check proper low- …

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