[TRNSYS-users] RADIATIVE PART of Heating

Wed Feb 23 02:01:59 PST 2011

Dear all,

I want to make sure the exact value about RADIATIVE PART in the TRNBUILD
Heating option. e.g. What's the exact RADIATIVE PART or Convection Part
value of the wall heating and radiator and convector?

Or Please introduce me some TRNSYS references and literature about RADIATIVE
PART or Convection Part value of the wall heating and radiator and convector
etc.

Please introduce me some best English books about the heating(radiator,
convector, Wandheizung and floor heating) operating or working fundamentals
etc., walls' thermal energy storage and materials' pyhsics property etc.,
the infiltration and ventilation etc. and our this research topic's
literatures we must read.

many thanks!

Br.

wang

2011/2/23 <trnsys-users-request at cae.wisc.edu>

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> Today's Topics:
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>   1. Re: Problems with calling EES (Type66a) (David BRADLEY)
>   2. Re: Type66 EES and TRNSYS (David BRADLEY)
>   3. Re: acceptable temperature range (Fred Betz)
>
>
> ---------- 已转发邮件 ----------
> From: David BRADLEY <d.bradley at tess-inc.com>
> To: Doms Joris <joris.doms at vito.be>
> Date: Tue, 22 Feb 2011 16:40:04 -0600
> Subject: Re: [TRNSYS-users] Problems with calling EES (Type66a)
>  Joris,
>   It isn't actually the opening and closing that takes time (EES stays
> running the whole time). The slowness is the EES calculation time and the
> fact that EES is called at every single timestep and at every single
> iteration within a timestep of your TRNSYS simulation. There are a few
> different versions of Type66 that allow you to avoid calling EES whenever
> possible (basically an input that is an on/off switch for the EES
> calculations). If you know that your EES program doesn't have to be called
> (because the device that it models is inactive) then you can "turn off" the
> call to Type66 and save some time. Take a look at the EES example in the
> ..\TrnsysXX\Examples\Calling_EES\ directory; all the different options are
> shown in there.
> Kind regards,
>  David
>
>
> On 2/20/2011 15:43, Doms Joris wrote:
>
> Dear TRNSYS users,
>
> When simulating an applied thermal system, I'm using EES for the hydronic
> part. I programmed the hydronic circuit in EES and coupled it with TRNSYS
> via Type 66a. This coupling works fine, but;
>
> The problem is that the simulation runs very slow. Every timestep that
> TRNSYS calls EES, the EES project is opened and closed. Is there a way to
> set some settings so EES isen't closed and reopened each time, this would
> minimize the solution time alot.
>
> Thanks on advance
>
> Joris Doms
>
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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:+1.608.278.1475d.bradley at tess-inc.com
> http://www.tess-inc.comhttp://www.trnsys.com
>
>
>
> ---------- 已转发邮件 ----------
> From: David BRADLEY <d.bradley at tess-inc.com>
> To: Simon Binnemans <simon.binnemans at khk.be>
> Date: Tue, 22 Feb 2011 16:57:40 -0600
> Subject: Re: [TRNSYS-users] Type66 EES and TRNSYS
> Simon,
> If you would be willing to send me your TRNSYS project and EES code, I
> could probably debug it and find out why changing the size of szdelivertext
> isn't solving it. It may be that there is a limitation on the EES side of
> the connection as well; please don't quote me on that though until I get to
> look at it!
> Kind regards,
> David
>
>
> On 2/16/2011 04:36, Simon Binnemans wrote:
>
>> Dear all,
>>
>> I am currently using the Type66 object for exchanging data between TRNSYS
>> and ees.
>> At first it worked very well, but when I want to receive more than 34
>> inputs from ees, TRNSYS alway generates an error: "Error converting
>> clipboard data to numbers."
>> After searching for this problem, I found that the problem was situated in
>> the Type66 component, which only reads the first 512 characters from the
>> clipboard. The suggested solution was to modify the value of szdelivertext
>> to a higher number and recompile it.(
>> https://mailman.cae.wisc.edu/pipermail/trnsys-users/2009/004540.html)
>> I modified the value of szdelivertext to 40 000 in stead of the standard
>> 4000, but the result stayed the same.
>>
>> Can anyone suggest a solution for this problem?
>>
>> Best regards,
>>
>
> --
> ***************************
> 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
>
>
>
>
> ---------- 已转发邮件 ----------
> From: Fred Betz <fbetz at aeieng.com>
> To: Shahrdad JavidRad <shahrdad at live.de>, TRNSYS USERS <
> trnsys-users at cae.wisc.edu>
> Date: Tue, 22 Feb 2011 17:42:26 -0600
> Subject: Re: [TRNSYS-users] acceptable temperature range
>
> You’ll probably be better off using a simple feedback controller rather
> than an equation block because you can get frequent starts and stops or
> non-convergence warnings.
>
>
>
> Also, that’s a pretty large temperature range to operate over. Are you
> driving an absorption chiller with those temperatures?
>
>
>
> You might be better off controlling a variable speed pump to maintain your
> temperature range rather than shutting the pump off when the temperature
> exceeds 80C. If you shut off the pump when the temperature is over 80C, you
> risk exceeding the stagnation temperature of your panels in the real world.
>
>
>
> There is a solar thermal panel in the TESS libraries that has a built in
> controller that has an output for a variable speed pump that works really
> well.
>
>
>
> Good luck!
>
>
>
> Fred
>
>
>
> *Fred Betz**  *PhD., LEED AP
> Sustainable Systems Analyst
>
>
>
> *AEI* | AFFILIATED ENGINEERS, INC.
> 5802 Research Park Blvd. | Madison, WI  53719
>
> P: 608.236.1175 | F: 608.238.2614
> fbetz at aeieng.com  |  *www.aeieng.com*
>
>
>
>
>
> *From:* Shahrdad JavidRad [mailto:shahrdad at live.de]
> *Sent:* Tuesday, February 22, 2011 12:11 PM
> *To:* TRNSYS USERS
> *Subject:* [TRNSYS-users] acceptable temperature range
>
>
>
>
> Hello,
>
> in my solar thermal system I want to define an acceptable interval for the
> collector outlet temperature [65-80°C] by giving an output signal=1 for
> the pump in the collector loop. For any other temperatures out of this range
> the signal should be=0
>
> For this purpose I am using an Equation block!! (Is there any controller,
> that is able to do it?)
>
> I have defined these variables as:
>
> T_min=65
> T_max=80
> T_out= collector outlet temperature
>
>
> Signal=AND(GT(T_out,T_min),LT(T_out,T_max))*1+(1-AND(GT(T_out,T_min),LT(T_out,T_max)))*0
>
> I have plotted the signal. It works fine but I am experiencing a very long
> simulation time. More than 15 minutes just for a week.
>
> Is there any idea?
>
> Thanks,
> Shahrdad
>
>
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