Re: [TRNSYS-users] Example "SDHW" - how to set max. "temperature to load"?

[Michaël Kummert <michael.kummert@gmail.com>]

If you are talking about the standard “SDHW” example, I think Type 11 is in fact operating correctly, but the plotted TDHW variable is not always meaningful. Type 11 does not have any thermal mass, so when there is no flowrate through the tee-piece the outlet temperature is undefined. In that case Type 11 outputs the temperature at inlet 1 (i.e. the tank temperature, which is indeed sometimes much higher than 45 °C).

If you add a pipe (or anything with thermal mass) after the tee-piece you will get a nice constant plot at 45 °C. I am attaching a modified SDHW example with such an outlet pipe.

 

Michaël Kummert

Polytechnique Montréal

 

From: trnsys-users-bounces@cae.wisc.edu [mailto:trnsys-users-bounces@cae.wisc.edu] On Behalf Of Pavel Adam
Sent: Wednesday, February 13, 2013 16:09
To: trnsys-users@cae.wisc.edu
Subject: [TRNSYS-users] Example "SDHW" - how to set max. "temperature to load"?

 

Hello,

I am trying the example "SDHW" and I do not understand how the divertor (type 11) works.

I would expect that when the "set point temperature" is set at 45°C, then the "outlet temperature" from the "tee piece" should be max. 45°C. But it is not so ... the temperature reaches to the 80 °C.

Can you help me, please? How can I set max. temperature on the outlet from the "tank" ("temperature to load").

Thank you very much.

Best regards
Pavel Adam
Brno University of Technology

Attachment: SDHW.tpf
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