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Online Calculators

  • Air Duct calculator
• Conversion Factor		 • Flow Calculator
• Psychrometrics

Air Duct Calculator

Courtesy: www.connel.com

The program uses the Moody equation, the Colebrook equation, the Darcy-Weisbach equation, the perfect gas laws, and the Huebscher equation.

Inch-Pound Units

Flow rate CFM:

Velocity FPM:

Pressure PSI:

Temperature F:

Length FT:

Duct Material:
Uncoated Carbon Steel (smooth)
PVC Plastic Pipe (smooth)
Aluminum (smooth)
galvanized steel (medium smooth)
galvanized steel (average smooth)
fiberglass duct (medium rough)
fiberglass duct (rough)
flexible metallic duct (rough)
flexible duct fabric and wire (rough)
concrete (rough)

*

Metric Units

Flow rate M^3/S:

Velocity M/S:

Pressure Pascals:

Temperature C:

Length Meter:

Duct Material:
Uncoated Carbon Steel (smooth)
PVC Plastic Pipe (smooth)
Aluminum (smooth)
galvanized steel (medium smooth)
galvanized steel (average smooth)
fiberglass duct (medium rough)
fiberglass duct (rough)
flexible metallic duct (rough)
flexible duct fabric and wire (rough)
concrete (rough)

*

This program was developed by: Michael J. Rocchetti PE

 

Conversion Factors

Courtesy: www.connel.com

Select the units that you have, input the number, then select the units you want to convert to.

Energy Conversion Factors

Convert From:

Number:

Convert to:

*

Pressure Conversion Factors

Convert From:

Number:

Convert to:

*

Volume Conversion Factors

Convert From:

Number:

Convert to:

*

Density Conversion Factors

Convert From:

Number:

Convert to:

*

Specific Volume Conversion Factors

Convert From:

Number:

Convert to:

*

Specific Heat (Entropy) Conversion Factors

Convert From:

Number:

Convert to:

*

Enthalpy Conversion Factors

Convert From:

Number:

Convert to:

*

Thermal Conductivity Conversion Factors

Convert From:

Number:

Convert to:

*

Viscosity (absolute) Conversion Factors

Convert From:

Number:

Convert to:

*

Coefficient of Heat Transfer Conversion Factors

Convert From:

Number:

Convert to:

*

 

Flow Calculator

Courtesy: www.connel.com

The program is based on the Darcy-Weisbach equation, the Colebrook equation, and the Moody equation. The program is intended for use only on straight piping. The program does not include pressure losses due to elevation differences, or flow through fittings.

Fluid Temp F:
 Fluid Type is Water. Select a % of ethylene glycol
flow rate GPM:
Pipe Material:
Copper, type L
Steel, Schedule 40
 Pipe Size:
pipe length ft:
*

 

Psychrometrics

Courtesy: www.connel.com

The program is based on the procedure outlined in the 1997 ASHRAE Fundamentals Handbook, Chapter 6 - Psychrometrics.

The ASHRAE procedure outlines three situations which are commonly encountered.

Situation 1

Given: Dry Bulb Temperature (TDB) and Wet Bulb Temperature (TWB)
Calculate: PWSTWB, WSTWB, W, PWSTDB, WSTDB, U, RH, V, H, PWSTD, AND TD.

Dry Bulb Temp:

Wet Bulb Temp:

Temp Units: Fahrenheit Celsius

*

Situation 2

Given: Dry Bulb Temperature (TDB) and Dew Point Temperature (TD)
Calculate: PWSTD, W, PWSTDB, WSTDB, U, RH, V, H, and TD.

Dry Bulb Temp:

Dew Point Temp:

Temp Units: Fahrenheit Celsius

*

Situation 3

Given: Dry Bulb Temperature (TDB) and Relative Humidity (RH)
Calculate: PWSTDB, PWSTD, W, WSTDB, U, V, H, TD, and TWB.

Dry Bulb Temp:

Relative Humidity %:

Temp Units: Fahrenheit Celsius

*

This program was developed by: Michael J. Rocchetti PE

 

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