[TRNSYS-users] radiator type 1231

Wed Aug 2 02:53:30 PDT 2017

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 <
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>    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)
>
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> ---------- 已转发邮件 ----------
> From: Domenico Mazzeo via TRNSYS-users <trnsys-users at lists.onebuilding.org
> >
> To: "TRNSYS users mailing list at OneBuilding.org" <
> trnsys-users at lists.onebuilding.org>, Jeff Thornton <thornton at tess-inc.com>
> Cc: Jorge Facao <jorge.facao at 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 at 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 at 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 at lists.onebuilding.org>
> To: trnsys-users at 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) 278-1475www.tess-inc.com
> E-Mail: thornton at 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 at 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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