Eng-Tips is the largest engineering community on the Internet
Intelligent Work Forums for Engineering Professionals
-
Congratulations waross on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!
Estimate savings from air destratification 1
- Thread starter illhp
- Start date
-
1
- #3
It is a good question.
I would suspect that the savings are highly dependant on the space, so that any studies that might exist would be relavant only to a particular location, and not able to be generalized.
Seems like this topic would be a very good subject for a CFD study. However, if you want to take a stab at some rough manual calculations, I would suggest the following approach (I am assuming that you have an actual space that you are interested in):
Measure the temperature at various heights.
Determine the "U" for your walls and roof.
Using the U and the temperature at each height, calculate the heat loss from that "layer".
Repeat the calculation using a uniform temperature.
For extra credit, repeat each calculation with improved roof insulation.
Let us know what you find out. You might even come up with something worthy of publishing yourself.
I would suspect that the savings are highly dependant on the space, so that any studies that might exist would be relavant only to a particular location, and not able to be generalized.
Seems like this topic would be a very good subject for a CFD study. However, if you want to take a stab at some rough manual calculations, I would suggest the following approach (I am assuming that you have an actual space that you are interested in):
Measure the temperature at various heights.
Determine the "U" for your walls and roof.
Using the U and the temperature at each height, calculate the heat loss from that "layer".
Repeat the calculation using a uniform temperature.
For extra credit, repeat each calculation with improved roof insulation.
Let us know what you find out. You might even come up with something worthy of publishing yourself.
steam4
Mechanical
- Jun 21, 2003
- 23
- 0
- 0
illhp,
Try this company:
They have air rotating equipment, and can help you with calculations.
Try this company:
They have air rotating equipment, and can help you with calculations.
Hi illhip,
A simple solution is to install paddle or ducted ceiling fans to bring the warm air down to floor level.
As a rule of thumb, air temp. increases by 0.5 F for each foot of height above the thermostat level.
Savings from destratification vary according to the type of facility and the location, but for a normal building with normal exhaust rates, savings can be in the order of 0.5%-0.7% for every foot of building height above thermostat level based on the thermostat set temp.(68F-50F)
Regards
A simple solution is to install paddle or ducted ceiling fans to bring the warm air down to floor level.
As a rule of thumb, air temp. increases by 0.5 F for each foot of height above the thermostat level.
Savings from destratification vary according to the type of facility and the location, but for a normal building with normal exhaust rates, savings can be in the order of 0.5%-0.7% for every foot of building height above thermostat level based on the thermostat set temp.(68F-50F)
Regards
- Status
Similar threads
