Idris,
There are numerous reasons why this might happen. As I mentioned
in a previous mail if the current ambient wetbulb temperature is
higher than your desired outlet temperature then the desired outlet
temperature cannot be achieved. When I mentioned it before it was in
the context of the design condition not in the context of the
current conditions but the same physics applies. If you are unable
to determine the cause of the behavior then I would recommend that
you send your project to your distributor for assistance.
regards,
David
On 5/2/2015 7:30 AM, Shofolahan, Idris
Adewale wrote:
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@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?
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
http://www.tess-inc.com
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Copyright in this email and in any attachments belongs
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person to whom it is addressed. If you are not the
intended recipient, please note the following: (1) You
should take immediate action to notify the sender and
delete the original email and all copies from your
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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
============================================
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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