[TRNSYS-users] Type 510 cooling tower -Fan control signal error
David BRADLEY
d.bradley at tess-inc.com
Fri May 1 09:04:07 PDT 2015
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>
> *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
>>
>> ________________________________________
>> From: TRNSYS-users<trnsys-users-bounces at lists.onebuilding.org> on behalf oftrnsys-users-request at lists.onebuilding.org <trnsys-users-request at lists.onebuilding.org>
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>> Subject: TRNSYS-users Digest, Vol 124, Issue 42
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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 at tess-inc.com
>
> http://www.tess-inc.com
> http://www.trnsys.com
> Copyright in this email and in any attachments belongs to London South
> Bank University. This email, and its attachments if any, may be
> confidential or legally privileged and is intended to be seen only by
> the 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 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 at 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 at tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com
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