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

David BRADLEY d.bradley at tess-inc.com
Mon May 4 09:04:26 PDT 2015
Previous message: [TRNSYS-users] Type 510 cooling tower -Fan control signal error
Next message: [TRNSYS-users] Type 510 cooling tower -Fan control signal error
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
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 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>
>> *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>
>>> Sent: 29 April 2015 21:08
>>> To:trnsys-users at lists.onebuilding.org
>>> Subject: TRNSYS-users Digest, Vol 124, Issue 42
>>>
>>> Send TRNSYS-users mailing list submissions to
>>>          trnsys-users at lists.onebuilding.org
>>>
>>> To subscribe or unsubscribe via the World Wide Web, visit
>>>          http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org
>>>
>>> or, via email, send a message with subject or body 'help' to
>>>          trnsys-users-request at lists.onebuilding.org
>>>
>>> You can reach the person managing the list at
>>>          trnsys-users-owner at lists.onebuilding.org
>>>
>>> When replying, please edit your Subject line so it is more specific
>>> than "Re: Contents of TRNSYS-users digest..."
>>> 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 Ema
>>>   il addr
>>>
>>> ess -LSBUinfo at lsbu.ac.uk
>>> ============================================
>>> The LSBU communications disclaimer can be found athttp://www.lsbu.ac.uk/ict/legal/
>>>
>>>
>>> _______________________________________________
>>> TRNSYS-users mailing list
>>> TRNSYS-users at lists.onebuilding.org
>>> http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org
>>
>> -- 
>> ***************************
>> 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
> ============================================
> 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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/attachments/20150504/0bc298e3/attachment-0001.htm>
Previous message: [TRNSYS-users] Type 510 cooling tower -Fan control signal error
Next message: [TRNSYS-users] Type 510 cooling tower -Fan control signal error
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
More information about the TRNSYS-users mailing list