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Re: [TRNSYS-users] Type60t and convergence problems




Dear Matteo,

What time step are you using? The problem is not likely the tanks, because I vaguely recall that they have their own internal timestep. Yes, the problem is likely with the heatpump. It is not necessarily better to loosen the tolerences if you are having convergence issues.

Best regards,

Matt Duffy

----- Original Message -----
From: "Matteo DF" <deframat@gmail.com>
Sent: Thu, January 14, 2010 5:06
Subject: [TRNSYS-users] Type60t and convergence problems

Hi everybody,

I'm developing a model which simulates a solar assisted ground source heat pump. In this model I'm using 3 type60t tanks, one for domestic hot water, one for the ground heat exchangers (just before the heat pump) and another one is used for building heating.

The problem is this last tank, in fact it contains 3 internal heat exchangers, one for heat coming from the hp, one from solar collectors and the last one for the auxiliary heating... The problem is that if I connect the HP to it I get convergence errors (which are not present if the hp isn't connected...). I checked every parameter, I've modified the tollerance for convergence from 0.001 to 0.01 and placed some type31 tubes in every section which convoys water to the tank... But the problem persists...

How do I solve these problems? Isn't there a simpler tank which I can use that have the possibility to include at least 3 heat exchangers! ?

Thanks!
Matteo.

--
La scoperta è vedere ciò che tutti hanno sempre visto e
pensare ciò che nessuno ha mai pensato.
(Albert Szent-Gyorgyi, scopritore della vitamina C e premio Nobel)


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