Bimetallic vent dampers
Bimetallic vent dampers
(OP)
I'm looking for a company that manufactures bimetallic vent dampers that can make a custom one.
I have a 6" duct system in which I want to compensate (passively) for inlet air temperature. A bimetallic damper that has a range of:
120F full open
-40F partially closed to allow the same mass flow of air as there was in the fully-open 120F situation.
would do the job.
Perhaps there is something else that would do the same job
Pesy
I have a 6" duct system in which I want to compensate (passively) for inlet air temperature. A bimetallic damper that has a range of:
120F full open
-40F partially closed to allow the same mass flow of air as there was in the fully-open 120F situation.
would do the job.
Perhaps there is something else that would do the same job
Pesy





RE: Bimetallic vent dampers
A wax is used to actuate the diffuser.
http://www.eng-tips.com/viewthread.cfm?qid=86178
The above is a discussion on thermafusers.
Having said all that, I'm pretty sure that the diffusers aren't designed for the temperatures you have listed. I'm assuming that there is no electricity available? Perhaps a solar collector and battery could be arranged to power the damper?
RE: Bimetallic vent dampers
RE: Bimetallic vent dampers
Johnson Controls (www.jci.com) makes both.
Belimo is a major actuator company. www.belimo.com
Another standard solution is to use a 'low-ambiant compensaition' kit. Which consists of an outdoor air sensor and a three position damper. When outdoor air drops below a certain point the damper closes slightly to reduce the mass flow.
It depends on how precisely you want to control mass flow.
RE: Bimetallic vent dampers