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Re: [TRNSYS-users] a problem with the pipe (type31) algorithm

Pengfei Han,

Are you sure you have everything hooked up correctly and are watching the pipe output temperature and not the average temperature?  When I perform the indicated test in TRNSYS 18 I get exactly as I expect - see attached image.

 

jeff

 

---
Jeff Thornton
President - TESS LLC
3 N. Pinckney Street, Suite 202, Madison WI USA 53703
Office: (608) 274-2577  Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton@tess-inc.com

On 06/29/2020 3:29 am, han_pf via TRNSYS-users wrote:

Dear experts,

 

I think there is a problem with the pipe (type31) algorithm.

Due to the length of the pipe, changes in the input temperature do not immediately affect the outlet temperature. This phenomenon is very noticeable with long pipes. However, in trnsys, the outlet temperature of the pipe changes immediately regardless of the length of the pipe setting. As shown in the figure below, in a 1km pipe, when the input temperature changes by a step, the outlet temperature changes immediately. Is there a solution to this problem?

 

Thanks & Best Regards!

 

Pengfei Han   Ph.D. Student

 

1-235, School of Electronic Information and Electrical Engineering,

Shanghai Jiao Tong University Minhang Campus

800 Dongchuan Road, Minhang District

Shanghai, P.R.C.

Post Code: 200240

Mail: han_pf@sjtu.edu.cn

 

 


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Attachment: Type31.png
Description: PNG image