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1.3 EEV control

(1) Main EEV control

Main EEV operates with fuzzy control rules to keep the degree of super Heat(Superheat)

(about 3 ℃(37.4 ℉))at the evaporator outlet stable during heating mode

The degree of Superheat = Tsuction - Tevaporation

Tsuction : temperature at suction pipe sensor(℃,℉)

Tevaporation : evaporation temperature equivalent to low pressure(℃,℉)

(2) Subcooling EEV control(about 15 ℃(59 ℉))

Subcooling EEV works with fuzzy rules to keep the degree of Subcool at the outlet of subcooler during

cooling mode

The degree of Subcool = Tcondensation - Tliquid

Tliquid : temperature at outlet of subcooler(℃,℉)

Tcondensation : condensation temperature equivalent to high pressure(℃,℉)

(3) Avoiding excessive high discharge temperature : when main EEV opens some given opening and dis-

charge temperature is above 85 ℃(185 ℉) in heating operation, subcooling EEV may control the "sub-

cooling out temperature-evaporating temperature" to be some given difference.

Function

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