Re: [TRNSYS-users] TRNSYS-users Digest, Vol 76, Issue 38

Thank you, thank you very much.
I'm preparing my memoiry of master i'm special in mechanic engeneering of thermal power, my memoiry is about ISCC integrated solai combine cycle systeme, if you have in exemple projet in transys about this send it please to study it.

2011/4/11 <trnsys-users-request@cae.wisc.edu>

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Today's Topics:

1. Re: time delay by means of type 93 (input value recall)
(Matt Duffy)

---------- Message transféré ----------
From: "Matt Duffy" <duffy@tess-inc.com>
To: "Stefan Wachter" <wachter@mail.hs-ulm.de>, trnsys-users@cae.wisc.edu
Date: Mon, 11 Apr 2011 15:35:35 -0500 (CDT)
Subject: Re: [TRNSYS-users] time delay by means of type 93 (input value recall)

Hello Stefan,

As long as you implement the timestep as a fraction in an EQUATIONS in the control cards, you should be ok. For example,

EQUATIONS 1
TIMESTEP=2/60 !Timestep of 2 mins

Please see the attached for reference.

Best regards,

Matt Duffy
----- Original Message -----
From: "Stefan Wachter" <wachter@mail.hs-ulm.de>
Sent: Fri, April 8, 2011 4:05
Subject: [TRNSYS-users] time delay by means of type 93 (input value recall)
Hello everybody,

I am new at trnsys-users.

Currently I`m modeling an already existing solar heating system (for hot water).

In this system the loading pump is activated by a time delay of 4 minutes (after solar pump is launched).

I tried to model this as follows:

- simulation time step: 2 minutes

- storage of the control signal of the solar pump over the last two time steps by means of type 93 (input value recall)

- if the control signal of the solar pump is "1" in the stored two time steps, then the loading pump is launched.

It works (tried by a simple example deck) but does it also works in context with a quite big deck (120 m² apertur area, 2 continuous controllers)?

I`m concerned about that the small time step of 2 minutes could cause problems (for example oscillations of the controllers).

Could this work or have someone of you another idea how i can solve this problem?

Thanks a lot.

Best regards.

Stefan Wachter
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