[TRNSYS-users] radiator type 1231

Dear all,

I'd like to ask you one question about the error for Radiator Type 1231 shown in attached picture.

I used its heat transfer rate output to connect Type 56's own-defined input as the heating power. Then it appears that error. If I delete Radiator Type 1231, it runs well.

Many thanks

Br.

Yang

2017-08-01 21:12 GMT+01:00 via TRNSYS-users <trnsys-users@lists.onebuilding.org>:

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Today's Topics:

1. Re: variable timestep (Domenico Mazzeo via TRNSYS-users)
2. Re: Exact same control signal for different Type 11f gives
diferent results. (Jeff Thornton via TRNSYS-users)

---------- 已转发邮件 ----------
From: Domenico Mazzeo via TRNSYS-users <trnsys-users@lists.onebuilding.org>
To: "TRNSYS users mailing list at OneBuilding.org" <trnsys-users@lists.onebuilding.org>, Jeff Thornton <thornton@tess-inc.com>
Cc: Jorge Facao <jorge.facao@lneg.pt>
Bcc:
Date: Tue, 1 Aug 2017 18:09:08 +0200
Subject: Re: [TRNSYS-users] variable timestep
You could run more simulation with different time steps.
Then you could join the results with a variable time step.
Regards

Il 01 Ago 2017 16:53, "Jeff Thornton via TRNSYS-users" <trnsys-users@lists.onebuilding.org> ha scritto:
No, TRNSYS uses a fixed time step for the duration of the simulation.

Jeff

Sent from my iPhone

> On Jul 31, 2017, at 11:10 AM, Jorge Facao via TRNSYS-users <trnsys-users@lists.onebuilding.org> wrote:
>
> Hello,
> Is it possible to run a simulation with variable time-step in TRNSYS 17?
> I have tried to put a time-step as a string in control cards but TRNSYS
> consider the initial value of the string for all simulation.
> Thanks in advance and best regards,
>
> --
> Jorge Facão
>
> Laboratório Nacional de Energia e Geologia (LNEG)
> Laboratório de Energia Solar
> Estrada do Paço do Lumiar, 22
> 1649-038 Lisboa - Portugal
> T: +351-210924600/1; Ext: 4379
> skype: jfacao
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---------- 已转发邮件 ----------
From: Jeff Thornton via TRNSYS-users <trnsys-users@lists.onebuilding.org>
To: trnsys-users@lists.onebuilding.org
Cc:
Bcc:
Date: Tue, 01 Aug 2017 14:57:14 -0500
Subject: Re: [TRNSYS-users] Exact same control signal for different Type 11f gives diferent results.
Javier,

That sounds suspiciously like a convergence problem. Have you checked the list file to see if you are running into convergence issues? Have you tried to TRACE the models in question to see what's happening on an iteration by iteration basis? If it's convergence problems then the questions become: are you using a small timestep? Are you using a controller with hysteresis? etc.

Jeff
---
Jeff Thornton
President - TESS LLC
22 N. Carroll Street, Madison WI USA 53703
Office: (608) 274-2577  Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton@tess-inc.com
On 08/01/2017 7:56 am, Javier Vega via TRNSYS-users wrote:
Hello TRNSYS users,

I want to use two Type 11f (controller flow diverter) components with the same control signal. One Type 11f redirects solar collector flow

(Type 553), while the other redirects another circuit's flow to one an Air-Source Heat Pump or a Water Source Heat Pump (Type 941 or Type 927). The events are supposed to happen at the same time.

Monitoring the results, my DHW temperature falls. When I looked it up, the flow diverters aren't working at the same time. And what it's worse, something happens with the Heat Pumps: I studied the control signals, and they are activated at the same time, but the heat pump's circuit redirects the flow when it isn't supposed to happen and also the Heat Pump that by mistakes recieves flow doesn't heat the water flow. This is what bothers me the most because I set the Heating control signal to a constant 1, so everytime the HP recieves flow it heats.

I simply don't know how to address this issue, same control signals giving different results, and a Heat Pump that recieves flow by mistake but doesn't heat. I would appreciate some help.

Kind Regards,
Javier Vega

Universidad de Concepcion

2017-07-28 15:29 GMT-04:00 Javier Vega <jvega025@gmail.com>:

Hello TRNSYS users,

I want to use two Type 11f (controller flow diverter) components with the same control signal. One Type 11f redirects solar collector flow

(Type 553), while the other redirects another circuit's flow to one an Air-Source Heat Pump or a Water Source Heat Pump (Type 941 or Type 927). The events are supposed to happen at the same time.

Monitoring the results, my DHW temperature falls. When I looked it up, the flow diverters aren't working at the same time. And what it's worse, something happens with the Heat Pumps: I studied the control signals, and they are activated at the same time, but the heat pump's circuit redirects the flow when it isn't supposed to happen and also the Heat Pump that by mistakes recieves flow doesn't heat the water flow. This is what bothers me the most because I set the Heating control signal to a constant 1, so everytime the HP recieves flow it heats.

I simply don't know how to address this issue, same control signals giving different results, and a Heat Pump that recieves flow by mistake but doesn't heat. I would appreciate some help.

Kind Regards,
Javier Vega

Universidad de Concepcion
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