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Normally Range difference is5.5 to6 dec C
12.2 -6.7 (approximately) Dec C
4to6 degree temperature difference
Eg.... Let EWT 12 then LWT should be 8 degree. Is good.
ewt - entering water temperature 50 -55 Fahrenheit lwt - leaving water temperature-42 -45 Fahrenheit.
Generally its6.7 to12 deg C. But if designer wants to decrease the air side load, it can be adjusted to5.5 to12 deg C. These two are the most common practices.
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