Re: Fwd: Enquiry on Type 4, Type60 and Type 66 modules

[Michaël Kummert <kummert@xxxxxxxxxxxxx>]

Dear Howard,

I was wrong, the current version of Type 66 allows you to use several 
units. It just does not work very well yet...

The first problem is that you will get errors and wrong results if the 
second unit has less inputs than the first one.

The second problem is that you may get a series of errors at the very 
end of the simulation (after you close the online plotter). Those errors 
seem to be operating system dependent but they have no influence on the 
results.

We currently have a fix for the first problem but we are still 
investigating the second one. Both problems should be fixed in the next 
TRNSYS update. Users who want to receive the first fix before that can 
contact me directly. As Dave mentioned it, you should also make sure you 
use a recent professional version of EES.


Regards,

Michaël Kummert




David Bradley wrote:


> Dear Howard,
>   We recently completed a project that sounds quite similar to your 
> proposed system. In it we had two vapor compression cycles and two 
> storage tanks. Originally we were planning to put both vapor 
> compression cycles into the same EES file until we found out that it 
> is possible to use multiple instances of Type66 (my apologies for 
> contradicting Michaël - if I hadn't tried this last week I would have 
> said that only one Type66 instance was possible as well). We had some 
> trouble getting it to run initially but found that it was a matter of 
> some simple typos that we had made, which were causing stragne errors. 
> Initially, we used extremely simple EES files; each one had only one 
> input and one output. The first EES file simply added 1 to the input, 
> the other added 2. Once we got that working, we then started adding 
> the real equations to the EES files. One other thing that you need to 
> do is make sure that you have a recent version of EES (within the past 
> few months) because at one point, there was no way to completely turn 
> off EES warnings about nearly singular equations and that message was 
> not passed back to TRNSYS. We used tank models from our own libraries 
> (Type524 specifically). With this model, one of the parameters is the 
> number of isothermal nodes in the tank. You can look at the 
> temperature of each node separately and see how well stratified your 
> tank is. If the flow rates in and out of the tank are high, then you 
> will see a lesser degree of stratification. Please let me know if you 
> have any specific questions about the type of errors that you are seeing.
> Kind regards,
>   David
>
> At 01:46 PM 7/9/2003 -0500, you wrote:
>
>
> > > From: "Howard" <howardbut@hkusua.hku.hk>
> > > To: <trnsys@relay.doit.wisc.edu>, <bradley@tess-inc.com>
> > > Subject: Enquiry on Type 4, Type60 and Type 66 modules
> > > Date: Wed, 9 Jul 2003 22:07:55 +0800
> > > X-Mailer: Microsoft Outlook, Build 10.0.2627
> > > Importance: Normal
> > > Reply-To: trnsys@relay.doit.wisc.edu
> > > Sender: owner-trnsys@relay.doit.wisc.edu
> > > X-pstn-levels:     (C:79.9233 M:99.5542 P:95.5616 R:95.9108 S: 9.5790 )
> > > X-pstn-settings: 1 (0.1500:0.1500)    
> > > X-pstn-addresses: from <howardbut@hkusua.hku.hk>
> > >
> > > Dear all,
> > >
> > > Currently I am trying to model a hot water storage tank for storing 
> > > water heated by a heat pump. There are two similar models, the Type 
> > > 4 and Type
> > >
> > > 60 in the TRNSYS and I would like to know:
> > >
> > >  
> > > - Any general guidelines to decide which Type of storage tank should 
> > > be used?
> > >
> > > - How do we define the number of stratification? Aren't the 
> > > stratification is a natural phenomena?
> > >
> > >  
> > > On the other hand, I tried to write my own component in EES (such as 
> > > the compressors, condensers) and would like to add them into the 
> > > Trnsys project by Type66 module.
> > >
> > > However, plenty of error popped up when I started the simulation if 
> > > two or more Type66 module is used. I sorted out there may be some 
> > > problem with the data transfer through CLIPBOARD but I cannot 
> > > resolve it indeed. Does anyone have similar experience before which 
> > > can share?
> > >
> > >  
> > > Regrads,
> > >
> > >  
> > > Howard But
> > >
> > > The University of Hong Kong
> >
> > *********************************************************************************
> > Thermal Energy System Specialists (TESS)
> > Jeff Thornton                                   2916 Marketplace Drive
> > Principal                                       Suite 104
> > Phone:  (608) 274-2577                  Madison WI 53719
> > Fax:  (608) 278-1475                            USA
> > E-mail:   thornton@tess-inc.com                 
> > Web Page:       www.tess-inc.com <http://www.tess-inc.com/>
> >
> > "Providing software solutions for today's energy engineering projects"
> > *********************************************************************************
> ********************************************************************************* 
> Thermal Energy System Specialists (TESS)
> David BRADLEY                           2916 Marketplace Drive - Suite 
> 104
> Project Engineer                           Madison, WI 53719
> Phone: (608) 274-2577 USA
> Fax: (608) 278-1475
> E-mail: bradley@tess-inc.com
> Web Page:          _www.tess-inc.com_ <http://www.tess-inc.com/>_
>
> _"Providing software solutions for today's energy engineering projects"
> **************************************************************************** 
> *****
--
_________________________________________________

Michaël Kummert

Solar Energy Laboratory - University of Wisconsin-Madison
1303 Engr Res Bldg, 1500 Engineering Drive
Madison, WI 53706

Tel: +1 (608) 263-1589
Fax: +1 (608) 262-8464
E-mail: kummert@engr.wisc.edu

SEL Web Site: http://sel.me.wisc.edu
TRNSYS Web Site: http://sel.me.wisc.edu/trnsys