Greenhouse Air Flow

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The Greenhouse Airflow Calculator computes common airflow metrics for a greenhouse (see below).

INSTRUCTIONS: Choose units and enter the following:

(FAS) Fan Airspeed
(FD) Fan Diameter
(ASM) Airspeed in middle of greenhouse
(ASE) Airspeed at end of greenhouse
(L) Greenhouse Length
(W) Greenhouse Width
(H) Greenhouse Height
(iT) Inside Temperature
(oT) Outside Temperature

Greenhouse Airflow Metrics (GAM): The calculator returns the following greenhouse metrics:

(AFF) Airflow rate at the fan level in cubic meters per second
(AFM) Airflow rate in the middle of the greenhouse in cubic meters per second
(AFE) Airflow rate at the end of the greenhouse in cubic meters per second
(ECE) Evaporative Cooling Efficiency as a percentage

NOTE: The answers can be converted to compatible units via the pull-down menu to the right of the answers.

The Math / Science

Special thanks to Dr. Dhia Alchalabi, Associate Professor of Agricultural Engineering Technology for providing the equations used in this calculator. Now in retirement, Dr. Alchalbi desires to pass his wealth of knowledge on to future generations, and we are in his debt.

Greenhouse and High-tunnel Calculators

Volume of a Gabled Greenhouse: Enter the dimensions of a gabled building and compute the cubic feet volume.
Volume of an Arched Roofed Greenhouse: Enter the dimensions of an arched roofed building (see diagram) and compute the cubic feet volume.
Volume of a Quonset Hut Greenhouse: Enter the dimensions of the Quonset Hut and compute the cubic feet volume.
Surface Area of a Gabled Greenhouse: Enter the dimensions of a normal gabled building and compute the square feet surface area.
Surface Area of an Arched Roof Greenhouse: Enter the dimensions of an arched roof building and compute the square feet surface area.
Surface Area of a Quonset Hut Greenhouse: Enter the dimensions of a Quonset Hut and compute the square feet surface area.
Bell-shaped Greenhouse Volume and Surface Area: Computes volume, surface area, floor space and height based on dimensions.
Greenhouse Air Flow: Computes the air flow volume at the fan, middle and end of the greenhouse and the Evaporative Cooling Efficiency
Conductive Heat Loss: Enter the surface area, the heat loss coefficient for the surface material and the maximum heat range, and the calculator will compute the BTUs per hour needed to heat the inside.