[TRNSYS-users] Type 510 cooling tower -Fan control signal error

Sat May 2 05:30:55 PDT 2015

David,

Thank you. Yes,I am trying to achieve an outlet temperature set at 8th input and I did set the fan control signal (input 7) to -1 but, the outlet water temperature is still higher than the desired outlet temperature.For example,the desired outlet temperature was set at 24C as the 8th input, but the outlet fluid temperature was 29C. What is the reason for not achieving the desired outlet fluid temperature?

Regards

Idris

________________________________
From: David BRADLEY <d.bradley at tess-inc.com>
Sent: 01 May 2015 17:04
To: Shofolahan, Idris Adewale; TRNSYS users mailing list at OneBuilding.org
Subject: Re: [TRNSYS-users] Type 510 cooling tower -Fan control signal error

Idris,
 The design outlet fluid temperature is the outlet fluid temperature that you would get if all the inlet conditions were at the design condition. The design outlet fluid temperature is not a "set point" temperature that the tower is trying to achieve. If you are trying to achieve a certain outlet temperature then you have to set that temperature as the 8th input and you have to set the fan control signal (input 7) to -1 (as it says in the "more" buttons for the Type). If you are not trying to control the outlet liquid temperature but just want it to be closer to the wetbulb temperature then you have to increase the air flow rate that the fans are providing.
 regards,
  David

On 4/30/2015 5:45 PM, Shofolahan, Idris Adewale wrote:

David,

Thank you for your response.I have checked the parameters as suggested.The design outlet fluid temperature was not below the design wet bulb temperature. Although,when I reduce the design wet bulb temperature,I didn't get any error message.

However,the outlet water temperature is higher than the design outlet fluid temperature. How can I achieve a lower outlet water temperature,probably similar to the design outlet fluid temperature or lower?

Regards,

Idris

________________________________
From: David BRADLEY <d.bradley at tess-inc.com><mailto:d.bradley at tess-inc.com>
Sent: 30 April 2015 15:35
To: TRNSYS users mailing list at OneBuilding.org; Shofolahan, Idris Adewale
Subject: Re: [TRNSYS-users] Type 510 cooling tower -Fan control signal error

Idris,
  The error message doesn't have to do with the fan control signal. The error is that the model cannot determine the energy transfer coefficients for the tower given the parameters that you have entered. For example, if you give a design outlet fluid temperature that is below the design wet bulb temperature then it is physically impossible for a tower to deliver such an outlet water temperature and the model will generate the error that you received. The fan control signal appears involved because the energy transfer coefficients are only calculated if the tower is actually on and running.
regards,
 David

On 4/30/2015 12:20 AM, Shofolahan, Idris Adewale wrote:

Dear all,

I'm currently working on a project using a chiller and type 510 cooling tower. The project is given error when the fan control signal is set at 1 at the input tab. What do you think is the cause of this error? Schematics and error message of the project attached.Thank you.

Regards,
Idris

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***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
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