gt1565a
Materials
- Mar 26, 2003
- 2
I am looking for any advice on selecting an appropriate temperature controller for my application.
I have a 7000 gallon polymer quench tank used for heat treating seel. Our desired operating range is 75-100 deg F. The tank is equipped with a combustion burner for heating the quenchant. This is rarely used as the tank temp only falls below 70 on really cold days. The burner is operated via a Barber-Coleman Model 10Q temprature controller. When we quench a load, the temperature of the quenchant rises to above 100 degrees. Historically, we've only quenched 1-2 loads per day so we let the temperature fall naturally between loads. Because of increased demand and slow recovery during hot summer months, we are installing a cooling tower (Baltimore Aircoil (BAC) model VF1). We are looking to interface the cooling tower with a temperature controller.
This is where my question comes in. My only experience with temperature controllers is with PID/Fuzzy Logic controllers with a single output used in heating furnaces. So while I think I know what I want to do, I'm not quite sure the best way to go about it and what hardware to use.
What I envision is a single contoller to control both the heating and cooling. The control would be ON/OFF type with hysteresis. I'd set a set-point at say 85 F. When the temp deviates +15 (100 F) from the setpoint the controller (output 1) would turn on the cooling tower via an SSR. The cooling tower would run until the temp drops to 90 F (SP +5). If the temp deviates -10 from the set point (75 F) the controller (output 2) would signal the burner to run (with some manual ignition, etc as currently done). The burner would run until the temp rises to 80 F (SP - 5).
What I want to avoid is a tight control around a setpoint where the burner and/or cooling tower are being switch on and off to maintain a specific temperature.
The current BC-10Q controller only has a single relay output and no alarm outputs so I don't think it will be able to control both the burner and the cooling tower.
So what I'm looking for here is for someone more expreienced to tell me if my control idea is reasonable for this application, or if there is a better approach, and to recommend a type of controller (Honeywell preferred), or features to look for in a controller for the application.
Thank you, any advice will be much appreciate!
-Ben
I have a 7000 gallon polymer quench tank used for heat treating seel. Our desired operating range is 75-100 deg F. The tank is equipped with a combustion burner for heating the quenchant. This is rarely used as the tank temp only falls below 70 on really cold days. The burner is operated via a Barber-Coleman Model 10Q temprature controller. When we quench a load, the temperature of the quenchant rises to above 100 degrees. Historically, we've only quenched 1-2 loads per day so we let the temperature fall naturally between loads. Because of increased demand and slow recovery during hot summer months, we are installing a cooling tower (Baltimore Aircoil (BAC) model VF1). We are looking to interface the cooling tower with a temperature controller.
This is where my question comes in. My only experience with temperature controllers is with PID/Fuzzy Logic controllers with a single output used in heating furnaces. So while I think I know what I want to do, I'm not quite sure the best way to go about it and what hardware to use.
What I envision is a single contoller to control both the heating and cooling. The control would be ON/OFF type with hysteresis. I'd set a set-point at say 85 F. When the temp deviates +15 (100 F) from the setpoint the controller (output 1) would turn on the cooling tower via an SSR. The cooling tower would run until the temp drops to 90 F (SP +5). If the temp deviates -10 from the set point (75 F) the controller (output 2) would signal the burner to run (with some manual ignition, etc as currently done). The burner would run until the temp rises to 80 F (SP - 5).
What I want to avoid is a tight control around a setpoint where the burner and/or cooling tower are being switch on and off to maintain a specific temperature.
The current BC-10Q controller only has a single relay output and no alarm outputs so I don't think it will be able to control both the burner and the cooling tower.
So what I'm looking for here is for someone more expreienced to tell me if my control idea is reasonable for this application, or if there is a better approach, and to recommend a type of controller (Honeywell preferred), or features to look for in a controller for the application.
Thank you, any advice will be much appreciate!
-Ben