Re: [TRNSYS-users] Type 36-Trombe Wall

[saleh saadi <salehsnjsaadi404@yahoo.com>]

Hi Vali,

I don't know if you got a reply to your question. I have recently gone through the source code as well. The number '2' appears for the first and last node of the finite difference equation because of the 1/2 node concept. When you discretize the PDE, you divide by 1/2 gird size for both node 1 and last node, and therefore '2' will be in the numerator. 

regards,

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From: Vali Gheorghisor <valigheorghisor@yahoo.com>
To: "trnsys-users@cae.wisc.edu" <trnsys-users@cae.wisc.edu>
Sent: Monday, March 26, 2012 1:47 PM
Subject: [TRNSYS-users] Type 36-Trombe Wall

Hello Trnsys users,

I use Type 36 with Type 56 to simulate a Trombe Wall. Everything works well but I don't understand

one thing concerning the Source Code for Type 36. I don't understand why the big parantheses for

DTDT(1) and DTDT(N) are multiplied by 2. I analyzed the whole Source Code but I can't see where that "2"

is coming from. This is important for me because I also try to develop a type for a different Trombe Wall that the one

defined in Type 36. And that "2" makes a pretty big difference between the results.

Can someone help me?

Thank you in advance

Vali Florin

Politechnical University of Bucharest

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