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?
From:
David BRADLEY <d.bradley@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
d.bradley@tess-inc.com
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Copyright in this email and in any attachments belongs to
London South Bank University. This email, and its
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please note the following: (1) You should take immediate
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and all copies from your computer systems; (2) You should
not read copy or use the contents of the email nor disclose
it or its existence to anyone else. The views expressed
herein are those of the author(s) and should not be taken as
those of London South Bank University, unless this is
specifically stated. London South Bank University is a
company limited by guarantee registered in England and
Wales. The following details apply to London South Bank
University: Company number - 00986761; Registered office and
trading address - 103 Borough Road London SE1 0AA; VAT
number - 778 1116 17 Email address - LSBUinfo@lsbu.ac.uk
============================================
The LSBU communications disclaimer can be found at
http://www.lsbu.ac.uk/ict/legal/
--
***************************
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
d.bradley@tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com
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