Tools

Drawing Specification Worksheets

Note: These forms must be filled out in Adobe Reader or Adobe Acrobat, not within your web browser. To download, right-click on a link and choose “Save Target As” or “Save Link As”. Once downloaded, double-click on the form to open it in Adobe Reader or Adobe Acrobat. Fill out the form, save it, and send it as an email attachment to sales@madok.com

Operating Condition Worksheets

Common Formulas

Face Area (ft2): FA = FH x FL / 144
Face Velocity (fpm): FV = SQEM / FA
Heating Applications: SH = 1.085 x SCFM x (DBL – DBE)
GPM = SH / 500 x (EWT – LWT)
Cooling Applications: TH = 4.5 X SCFM X (HE – HL)
SH = 1.085 x SCFM x (DBE – DBL)
GPM = TH / 500 X (LWT – EWT)

Where: DBE = Entering air dry bulb (°F.)
DBL = Leaving air dry bulb (°F.)
EWT = Entering water temperature (°F.)
FA = Coil face area (ft2)
FH = Finned height (in.)
FL = Finned length (in.)
FPM = Feet/minute
FV = Face velocity (fpm)
GPM = U.S. gallons/minute of water
HE = Enthalpy of entering air (BTU/lb.)
HL =Enthalpy of leaving air (BTU/lb.)
LWT = Leaving water temperature (°F.)
SCFM = Standard cubic feet/minute of air
SH = Sensible heat (BTU/hour)
Total heat (BTU/hour)

Note: On Cooling Applications with dehumidification (wet coils), the face velocity should not exceed 500 fpm to prevent water-carryover from the coil.