After lots of reading I fould a formula for heat transfer that I think will be helpful for alot of closet/stealth growers
The formula is:
Q = V x P x C x dT
where:
Q = Amount of lighting (kW)
V = Volume of air being ventilated (m3/s)
P = Density of air (assume 1.2 kg/m3)
C = Specific heat capacity of air (assume 1.02 kJ/kgK)
dT = Temperature difference between ambient and growspace air in degC
***To get from CFM to m3/s divide the CFM by 2119.
You can solve the equation for different things based on what your need...
to find the temp change from outside the cabinet to inside
dT=Q/(V x P x C)
For my next grow room with a 400w light and 200cfm fan
dT=.4/(.94x1.2x1.02)
=.4/.257
=3.47+21c=24.47c or 76f
to find approx the amount of vent you will need
V = Q / (P x C x dT)
to find the most lighting you can have
Q = V x P x C x dT
kinda cool...don't know how accurate it is real world tho
try it with your own stats and see how close it comes
The formula is:
Q = V x P x C x dT
where:
Q = Amount of lighting (kW)
V = Volume of air being ventilated (m3/s)
P = Density of air (assume 1.2 kg/m3)
C = Specific heat capacity of air (assume 1.02 kJ/kgK)
dT = Temperature difference between ambient and growspace air in degC
***To get from CFM to m3/s divide the CFM by 2119.
You can solve the equation for different things based on what your need...
to find the temp change from outside the cabinet to inside
dT=Q/(V x P x C)
For my next grow room with a 400w light and 200cfm fan
dT=.4/(.94x1.2x1.02)
=.4/.257
=3.47+21c=24.47c or 76f
to find approx the amount of vent you will need
V = Q / (P x C x dT)
to find the most lighting you can have
Q = V x P x C x dT
kinda cool...don't know how accurate it is real world tho
try it with your own stats and see how close it comes