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Re: Simple building with radiator heating

Date: Thu, 31 Oct 2002 00:14:19 +0100
Date: Wed, 30 Oct 2002 17:21:05 -0600
From: Rauch-Muenster@xxxxxxxxxxx (Dr.Karl-Christian Rauch)
Subject: Re: Simple building with radiator heating

Dear Ulrika,

perhaps the publication in the annex is of some interest for you.

The measured data have been taken at a supplier station of a
real existing house in Berlin.

The given formulas, I could imagine, are very simply to code for
an own TRNSYS-Subroutine-Type with some further coding.

Our heat transfer model for the radiators corresponded very well
with the measured data.

Kind regards
Karl-Christian Rauch

SAP R/3 Application Developer
Consultant Tivoli Storage Management
----- Original Message ----- 
From: Ulrika 
To: trnsys@relay.doit.wisc.edu 
Sent: Wednesday, October 30, 2002 2:04 PM
Subject: Simple building with radiator heating

Dear TRNSYS users;
I’m trying to model a small distrikt heating network, where the houses heating and DHW load are met by a hot water distribution net. To model the houses, I have used Type 12a, The equation used for heat transfer to the room (Qtrans=e*Cmin*(Tin-Troom) does not correspond well with the heat transfer rate for radiators. Does anybody know of a better house model (or combination of components) to use in this case? 

I’m fairly new to TRNSYS, so I don’t know how difficult it might be to alter a model (for example Type 12) in order to get a more accurate expression for the heat transfer rate. Maybe that could be another way to achieve what I’m trying for?

I’m most grateful for any advise in this matter…

Kind regards,

Ulrika Ottosson
Umeå university
Sweden

-----Ursprungligt meddelande-----
Från: owner-trnsys@relay.doit.wisc.edu [mailto:owner-trnsys@relay.doit.wisc.edu] För rost8@excite.com
Skickat: den 11 oktober 2002 12:36
Till: trnsys@relay.doit.wisc.edu
Ämne: RE: Question about type 81 (Borehole model (Dr. P. Pahud)

Jong,
the Error range check occurs usually if you have unfortunatly a bad component order.
That means, it is not direct caused by the component you useed. Instead it is the range of the components.
For example: An Output type in the component order should be listed at the end of the list. This is, because there is no other unit which requires a result of the Output type. So they can go last!
Equation Modes are better at the beginning of the list, but keep them in the right order. Do not let TRNSYS calculate with a variable that you do not provieded before. This will slow down the speed or occur the range check error.
You find the order of components on the global infos.

regards,

Henrik
Korea - SEOUL

--- On Fri 10/11, Jong, M.J.M. < jong@ecn.nl > wrote:
From: Jong, M.J.M. [mailto: jong@ecn.nl]
To: trnsys@relay.doit.wisc.edu
Date: Fri, 11 Oct 2002 10:18:09 +0200
Subject: Question about type 81 (Borehole model (Dr. P. Pahud)

> Dear Trnsys-users,
> 
> At this moment I am simulating a house with a heat pump that is connected
> to
> a ground heat exchanger. For the ground heat exchanger, I use type 81,
> called "The Superposition Borehole Model" by Dr. D. Pahud, Dr.
> A. Fromentin
> and J.C. Hadorn.
> 
> I want to simulate a system with 3 ground heat exhangers with a lenght of
> 30
> m. each. The centre to centre distance between the heat exchangers is 10
> m.
> This model uses an input parameter file for configurating the borehole
> heat
> exchanger. Below this file is shown.
> 
> ******************************************************************
> 
> BODEMWARMTEWISSELAAR PVT BODEMREGENERATIE
> 2
> 1Q
> 0.1
> 7
> 4 0.01 2 0.03 3 0.04 2 0.16 2 0.31 2 0.62 2 1.25
> 2.4 2.5E6
> 0 FILE
> 10
> 10 0.0
> 0 FILE
> 1
> 3
> 28 2 0
> 0 -10 0
> 0 0 0
> 0 10 0
> 6
> 0
> 0
> 1
> 0D 365D1H
> 0D 365D
> 0D 30D 180D 365D
> 1
> 0D 3650D1H
> 2
> 1
> 0.001 1000 4.19E6 0.6
> 2300 2300
> 0.0102 0.0125 0.42
> 1.5 0.05 0.05 0.1
> 0
> END
> 
> ******************************************************************
> 
> The lines 0 -10 0
> 0 0 0
> 0 10 0
> are the coordinates of the boreholes. As you can see, I have 1 symmetry
> group, with 3 boreholes in the symmetry group. When I want to run my
> simulation, I get the message "Range check error".
> 
> When I modify my model to a model with 1 borehole, everything is OK. Does
> anybody know what I do wrong ?
> 
> With kind regards,
> 
> 
> Maurice Jong.
> 
> ============================================================================
> ======
> 
> Maurice Jong
> ECN - Energy research Centre of the Netherlands Department: Zon,
> Group DEGO
> P.O. Box 1 1755 ZG Petten Country: The
> Netherlands
> Telephone: +31 (0)224 564938 Fax: +31
> (0)224 568966
> E-mail: jong@ecn.nl Internet:
> http://www.ecn.nl/dego/main.html
> 
> ============================================================================
> ======
> 
> 

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References:
- Simple building with radiator heating
  - From: Ulrika

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