[TRNSYS-users] Own height factor of large opening in TRNFlow
王洋
wanghongyang1767 at gmail.com
Wed Dec 15 05:50:53 PST 2010
Dera All,
I have a question about Own height factor of large opening in TRNFlow: Our
windows are normal casement window. Should it be 1? I think the opening is
in a vertical wall. Is it right or not?
Many thanks!
Br.
wang
2010/12/14 <trnsys-users-request at cae.wisc.edu>
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> Today's Topics:
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> 1. Re: heat exchangere (David BRADLEY)
> 2. Re: Strange error when using the equation proforma (David BRADLEY)
> 3. Re: Strange error when using the equation proforma (David BRADLEY)
> 4. Re: About building loads calculation in TRNSYS (David BRADLEY)
>
>
> ---------- 已转发邮件 ----------
> From: David BRADLEY <d.bradley at tess-inc.com>
> To: trnsys-users at cae.wisc.edu
> Date: Tue, 14 Dec 2010 15:56:15 -0600
> Subject: Re: [TRNSYS-users] heat exchangere
> Elly,
> If you have the TESS HVAC library, there are a number of heat exchangers
> with controlled outlet temperature models in there. If not then you will
> need to use a variable speed pump (Type3) , the heat exchanger, and (most
> likely) a PID controller (Type23).
> Best,
> David
>
>
> On 12/13/2010 15:24, e.nicolazzi at libero.it wrote:
>
>>
>> Dear Transys-user,
>>
>> I'm simulating, with trnsys 16, a plate heat exchanger for district
>> heating
>> substation. I'm using type 5b, is it correct?
>> There's a control unit that in function of external temperature and the
>> hot-
>> side outlet temperature (secondary pipe) open or close (%) the valve in
>> the hot-
>> side inlet temperature (primary pipe).
>> Can someone tell me how can i model a control unit? which types can i use?
>>
>> Thanks in advance,
>> Elly
>>
>>
>> _______________________________________________
>> TRNSYS-users mailing list
>> TRNSYS-users at cae.wisc.edu
>> https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users
>>
>>
> --
> ***************************
> David BRADLEY
> Principal
> Thermal Energy Systems Specialists, LLC
> 22 North Carroll Street - suite 370
> Madison, WI 53703 USA
>
> P:+1.608.274.2577
> F:+1.608.278.1475
> d.bradley at tess-inc.com
>
> http://www.tess-inc.com
> http://www.trnsys.com
>
>
>
>
> ---------- 已转发邮件 ----------
> From: David BRADLEY <d.bradley at tess-inc.com>
> To: a8304506 at graduate.hku.hk
> Date: Tue, 14 Dec 2010 16:00:22 -0600
> Subject: Re: [TRNSYS-users] Strange error when using the equation proforma
> Chun Kwong,
> You are correct in your understanding of how TRNSYS iterates to solve.
> However, it has to have somewhere to start so TRNSYS performs a check on all
> the equations before starting the simulation to make sure that it can solve
> them. If you wrote a set of equations that said:
>
> EQUATIONS 2
> A = B
> B = A
>
> there would be no way that TRNSYS could ever solve because it would have
> nowhere to begin the iteration. My guess is that your T_CHWS and T_CHWR
> equations are too interdependent.
> Best,
> david
>
>
> On 12/13/2010 20:38, a8304506 at graduate.hku.hk wrote:
>
> Hello, everyone.
>
> I am trying to simulate a chiller plant with primary and secondary chilled water
> pump systems. I use to equation proforma to calculate the chilled water flow
> and temperature at the supply and return header. However, I get the following
> error messages:
>
> *** Fatal Error at time : 0.000000
> Generated by Unit : Not applicable or not available
> Generated by Type : Not applicable or not available
> TRNSYS Message 420 : The following variable defined in an EQUATIONs or
> CONSTANTs card could not be solved as this variable depends on either an
> undefined EQUATION or CONSTANT name or depends on another EQUATION or CONSTANT
> that cannot be solved. For example A=B and B=A would trigger this error
> Reported information : T_CHWS
>
>
> *** Fatal Error at time : 0.000000
> Generated by Unit : Not applicable or not available
> Generated by Type : Not applicable or not available
> TRNSYS Message 420 : The following variable defined in an EQUATIONs or
> CONSTANTs card could not be solved as this variable depends on either an
> undefined EQUATION or CONSTANT name or depends on another EQUATION or CONSTANT
> that cannot be solved. For example A=B and B=A would trigger this error
> Reported information : T_CHWR
>
> I am a little bit confused. My understanding is that Trnsys performs the
> calculation in the equation proforma based on the input and the sequence of the
>
> equations as typed in the proforma, and the system performance at each time step
> is determined component by component which follow the order as indicated in the
> input file. Hence, should there be any improper formulation, the consequence
> should generally be non-convergence. Is my interpretation wrong, and how can I
> solve the problem? Please advise. Thank you!
>
> Best Regards
> LEE, Chun Kwong
> City University of Hong Knog
>
>
>
>
> _______________________________________________
> TRNSYS-users mailing listTRNSYS-users at cae.wisc.eduhttps://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users
>
>
> --
> ***************************
> David BRADLEY
> Principal
> Thermal Energy Systems Specialists, LLC
> 22 North Carroll Street - suite 370
> Madison, WI 53703 USA
>
> P:+1.608.274.2577
> F:+1.608.278.1475d.bradley at tess-inc.com
> http://www.tess-inc.comhttp://www.trnsys.com
>
>
>
> ---------- 已转发邮件 ----------
> From: David BRADLEY <d.bradley at tess-inc.com>
> To: a8304506 at graduate.hku.hk
> Date: Tue, 14 Dec 2010 16:00:41 -0600
> Subject: Re: [TRNSYS-users] Strange error when using the equation proforma
> Chun Kwong,
> You are correct in your understanding of how TRNSYS iterates to solve.
> However, it has to have somewhere to start so TRNSYS performs a check on all
> the equations before starting the simulation to make sure that it can solve
> them. If you wrote a set of equations that said:
>
> EQUATIONS 2
> A = B
> B = A
>
> there would be no way that TRNSYS could ever solve because it would have
> nowhere to begin the iteration. My guess is that your T_CHWS and T_CHWR
> equations are too interdependent and therefore can't be resolved.
> Best,
> david
>
>
> On 12/13/2010 20:38, a8304506 at graduate.hku.hk wrote:
>
> Hello, everyone.
>
> I am trying to simulate a chiller plant with primary and secondary chilled water
> pump systems. I use to equation proforma to calculate the chilled water flow
> and temperature at the supply and return header. However, I get the following
> error messages:
>
> *** Fatal Error at time : 0.000000
> Generated by Unit : Not applicable or not available
> Generated by Type : Not applicable or not available
> TRNSYS Message 420 : The following variable defined in an EQUATIONs or
> CONSTANTs card could not be solved as this variable depends on either an
> undefined EQUATION or CONSTANT name or depends on another EQUATION or CONSTANT
> that cannot be solved. For example A=B and B=A would trigger this error
> Reported information : T_CHWS
>
>
> *** Fatal Error at time : 0.000000
> Generated by Unit : Not applicable or not available
> Generated by Type : Not applicable or not available
> TRNSYS Message 420 : The following variable defined in an EQUATIONs or
> CONSTANTs card could not be solved as this variable depends on either an
> undefined EQUATION or CONSTANT name or depends on another EQUATION or CONSTANT
> that cannot be solved. For example A=B and B=A would trigger this error
> Reported information : T_CHWR
>
> I am a little bit confused. My understanding is that Trnsys performs the
> calculation in the equation proforma based on the input and the sequence of the
>
> equations as typed in the proforma, and the system performance at each time step
> is determined component by component which follow the order as indicated in the
> input file. Hence, should there be any improper formulation, the consequence
> should generally be non-convergence. Is my interpretation wrong, and how can I
> solve the problem? Please advise. Thank you!
>
> Best Regards
> LEE, Chun Kwong
> City University of Hong Knog
>
>
>
>
> _______________________________________________
> TRNSYS-users mailing listTRNSYS-users at cae.wisc.eduhttps://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users
>
>
> --
> ***************************
> David BRADLEY
> Principal
> Thermal Energy Systems Specialists, LLC
> 22 North Carroll Street - suite 370
> Madison, WI 53703 USA
>
> P:+1.608.274.2577
> F:+1.608.278.1475d.bradley at tess-inc.com
> http://www.tess-inc.comhttp://www.trnsys.com
>
>
>
> ---------- 已转发邮件 ----------
> From: David BRADLEY <d.bradley at tess-inc.com>
> To: Catherine <xueyushuiyun at gmail.com>
> Date: Tue, 14 Dec 2010 16:18:17 -0600
> Subject: Re: [TRNSYS-users] About building loads calculation in TRNSYS
> Catherine,
> You are quite correct that integrating solar collectors with the building
> skin will change the loads on the building. I would guess that in simulating
> such a situation, most people ignore the interaction and assume that the
> presence of the collectors changes the loads only slightly in comparison to
> the magnitude of the loads themselves.
>
> There are a few models of building-integrated photovoltaic panels in the
> TESS Green Building Library (now called the TESS Electrical Library) but
> they all assume an air gap behind the absorber surface and in front of the
> building skin.
> Kind regards,
> David
>
>
> On 12/9/2010 19:33, Catherine wrote:
>
> I want to calculate the building loads when the flat-plate
> collector stick to the flat roof , but , how to achieve it using TRNSYS ?
> Well , I tend to utilize the Type 56 for building model .By the way , my
> building is an ordinary six-storey residential building .And there is no air
> gap between the collectors and the roof-covering . As well as collectors
> completely covered the flat roof , except the location for lacing the water
> tank .
> On the one hand , since the collector block the radiation for the
> roof , which alters the energy balance of building , as well as causes
> changes in building loads. On the other hand , for the original building ,
> after the collector added to the roof, the thermal resistance increases ,
> with the building heat through the roof decreasing .
> Wish some suggestions .
>
>
> _______________________________________________
> TRNSYS-users mailing listTRNSYS-users at cae.wisc.eduhttps://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users
>
>
> --
> ***************************
> David BRADLEY
> Principal
> Thermal Energy Systems Specialists, LLC
> 22 North Carroll Street - suite 370
> Madison, WI 53703 USA
>
> P:+1.608.274.2577
> F:+1.608.278.1475d.bradley at tess-inc.com
> http://www.tess-inc.comhttp://www.trnsys.com
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users
>
>
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