- #1
Margalit
- 4
- 0
I have a practical problem that I am trying to solve regarding using air chambers. I hope someone can help me with the problem. I have two air chambers connected by a tubing and a valve. One is pumped to a low pressure, chamber A (~30 kPa), and the other is at near atmospheric pressure, chamber B. When I open the valve I get air rushing into chamber A. Once the valve is closed, the remaining air temperature in chamber A is hotter and the air in chamber B is colder. Both started at room temperature. So far this makes sense and I understand the reasons why this occurs.
However, I am looking for a solution to minimize the temperature drop in chamber B while still transferring the same total amount of air (30 L) in the same period of time (2-3 seconds). Any solution to this general problem is welcome.
I also have a specific implementation in mind however that I hope someone can comment if it is logical or illogical. The solution is to have a long tube or relatively large diameter (2 inches) connect between the valve and chamber B. The diameter of the tube will be significantly larger than the opening of the valve (0.5 inches), so there will be very little pressure differential per unit length in the large diameter tube. The idea is that the low temperature will be created at the valve to tube interface. The cold air will be formed at the valve. The long length of the tube will provide the necessary thermal diffusion distance for the air to be heated by the tube walls before the low temperature reaches chamber B. This of coarse only makes sense if the temperature differential is actually forming at the valve itself and not uniformly a long the tube and chamber B.
I am willing to experimentally do this solution, however if someone sees this as flawed logical it could save me a lot of time.
Thanks,
Near
However, I am looking for a solution to minimize the temperature drop in chamber B while still transferring the same total amount of air (30 L) in the same period of time (2-3 seconds). Any solution to this general problem is welcome.
I also have a specific implementation in mind however that I hope someone can comment if it is logical or illogical. The solution is to have a long tube or relatively large diameter (2 inches) connect between the valve and chamber B. The diameter of the tube will be significantly larger than the opening of the valve (0.5 inches), so there will be very little pressure differential per unit length in the large diameter tube. The idea is that the low temperature will be created at the valve to tube interface. The cold air will be formed at the valve. The long length of the tube will provide the necessary thermal diffusion distance for the air to be heated by the tube walls before the low temperature reaches chamber B. This of coarse only makes sense if the temperature differential is actually forming at the valve itself and not uniformly a long the tube and chamber B.
I am willing to experimentally do this solution, however if someone sees this as flawed logical it could save me a lot of time.
Thanks,
Near