Calculators › Industrial systems: air, pumps, fans, heat recovery Dryer dew-point guideline calculator
Dryer dew-point guideline
A conservative specification uses a dew point at least 18 Δ°F below the coldest demand-side ambient. A conservative specification uses a dew point at least 10 Δ°C below the coldest demand-side ambient.
Units IP (US) SI (metric)
T dp = T ambient,min − Δ T margin T_{\text{dp}} = T_{\text{ambient,min}} - {\Delta T_{\text{margin}}} T dp = T ambient,min − Δ T margin T dp = T ambient,min − Δ T margin T_{\text{dp}} = T_{\text{ambient,min}} - {\Delta T_{\text{margin}}} T dp = T ambient,min − Δ T margin
Calculator
Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.
Worked example
Given
T ambient,min T_{\text{ambient,min}} T ambient,min 43 °F Δ T margin {\Delta T_{\text{margin}}} Δ T margin 18 °F T dp = 43 − 18 = 25 T_{\text{dp}} = 43 - 18 = 25 T dp = 43 − 18 = 25
Given
T ambient,min T_{\text{ambient,min}} T ambient,min 7 °C Δ T margin {\Delta T_{\text{margin}}} Δ T margin 10 K T dp = 7 − 10 = − 3 T_{\text{dp}} = 7 - 10 = -3 T dp = 7 − 10 = − 3
Symbols and units
Symbol Meaning Unit
T dp T_{\text{dp}} T dp compressed-air dew point °F T ambient,min T_{\text{ambient,min}} T ambient,min lowest downstream ambient temperature °F Δ T margin {\Delta T_{\text{margin}}} Δ T margin design temperature margin °F
Symbol Meaning Unit
T dp T_{\text{dp}} T dp compressed-air dew point °C T ambient,min T_{\text{ambient,min}} T ambient,min lowest downstream ambient temperature °C Δ T margin {\Delta T_{\text{margin}}} Δ T margin design temperature margin K
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