Dry Bulb Temp (ASHRAE)
Dry Bulb Temp (ASHRAE)
(OP)
I am trying to size a heater for a building in a cold environment. I am not sure what outdoor temp I should use from ASHRAEs "Heating and Wind Design Conditions". Should I use "Heating DB 99.6%" or use "Coldest Month MDB 1%"
Thanks for your help
Thanks for your help





RE: Dry Bulb Temp (ASHRAE)
As long as the 99.6% condition is designed for assuming no internal heat gains you should be ok.
RE: Dry Bulb Temp (ASHRAE)
I appreciate your help very much. The system is for Fort Mac, a 99.6%DB of -34 deg C.
Dave
RE: Dry Bulb Temp (ASHRAE)
The MDB information in the Coldest month column should be used in conjunction with the associated wind speed and direction data provided.
Is this a new or existing building? Is it tight or leaky? Leaky building envelope and high winds will increase the load.
RE: Dry Bulb Temp (ASHRAE)
Regards,
RE: Dry Bulb Temp (ASHRAE)
Usually we responded; well, it's really cold outside eh?
We then recommended that they drop their ventilation rates for a little while until the cold snap passed.
**If you are not part of the solution, then you are part of the precipitate.**
RE: Dry Bulb Temp (ASHRAE)
Just go someplace warm for the winter