How to get the heat loss value(rate) when the garage door open?

[wufi2004]

How to get the heat loss value(or cfm ) when the garage door open in winter? I'm now so confused about how to get the open door
heat loss calculation. I can get the 3.9L/s/m2 for enclosed garage parking lot. but if doors open, and cars enter in winter, how to get the air infiltration rate? Thanks!

 

[CRG]

Look in the ASHRAE Handbooks for estimation of heat loss. The heat loss will be very high if you look at the worst case of a windy day in the winter. You may want to consider the installation of an air curtain if the door is open for extended periods of time.

 

[friartuck]

Try radiant heating. The ventilation loss is less significant.

Friar Tuck of Sherwood

 

[wufi2004]

Can air curtain reduce the heat loss(when the door open)? I have no idea about the air curtain. If I don't use air curtain, how to get the numerical value of the heat loss?

Ashrae book only has enclosed basement calculation.When door open, how to estimate the loss? Thanks!


Wufi

 

[CRG]

Manufactures should have information regarding their air curtains. Also see:

ASHRAE for info on air curtains:

1999 HVAC Applications 28.18
2004 HVAC Systems and Equipment 17.9

Infiltration through open doors:

2001 Fundamentals 26.10