Dear Wang,
The following document has information about radiator/convector.
ASHRAE, 2004 ASHRAE Handbook: HVAC Systems and Equipment, ASHRAE, Atlanta
Perhaps a basic heat transfer text, such as Incropera and Dewitt, may have information as well.
Best regards,
Matt Duffy
----- Original Message -----
From: "王洋" <wanghongyang1767@gmail.com>
Sent: Wed, February 23, 2011 15:22
Subject: [TRNSYS-users] RADIATIVE PART of Heating
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
在 2011年2月23日 上午11:01，王洋 <wanghongyang1767@gmail.com>写道：
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@cae.wisc.edu>
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Today's Topics:
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@tess-inc.com>
To: Doms Joris <joris.doms@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 advanceJoris 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:+1.608.278.1475 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com
---------- 已转发邮件 ----------
From: David BRADLEY <d.bradley@tess-inc.com>
To: Simon Binnemans <simon.binnemans@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@tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com
---------- 已转发邮件 ----------
From: Fred Betz <fbetz@aeieng.com>
To: Shahrdad JavidRad <shahrdad@live.de>, TRNSYS USERS <trnsys-users@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@aeieng.com | www.aeieng.com
From: Shahrdad JavidRad [mailto:shahrdad@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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