[TRNSYS-users] TRNSYS' difference and Transfer function coefficients

Tue Mar 29 06:19:18 PDT 2011

Dear all,

  I have some questions about TRNSYS as follows:

1. What's the range of the error(difference) between the Ideal Heating's
QHEAT after running in TRNSYS and the actual heating's QHEAT? i.e. What's
Max. and Min. error(difference) range?

2. What's the range of the error(difference) between the temperature sensor
in TRNSYS? What's the precision(accuracy) of the temperature in TRNSYS? Or
how does the temperature sensor measure the temperature Tair, Top etc.?

3. Whether does the TRNSYS calculate Transfer function coefficients based on
ASHRAE's methods such as Transfer function method or other methods? What's
the range of the error(difference) between this TRNSYS' method(Transfer
function method) and the actual situation?

The reason that I ask some about errors is I think my some simulation
results are so different from the actual situation etc.

Many thanks!
Br.

wang

在 2011年3月28日 下午6:51，王洋 <wanghongyang1767 at gmail.com>写道：

>
> 2011/3/27 <trnsys-users-request at cae.wisc.edu>
>
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>>
>>   1. Re: Questions about Type 194 and Type 665
>>      (=?utf-8?B?bHZndWFuZ3poYW8=?=)
>>
>>
>> ---------- 已转发邮件 ----------
>> From: "lvguangzhao" <lvguangzhao at 126.com>
>> To: "David BRADLEY" <d.bradley at tess-inc.com>
>> Date: Sun, 27 Mar 2011 16:51:10 +0800
>> Subject: Re: [TRNSYS-users] Questions about Type 194 and Type 665
>>  Hello David, thank you for your help! Now I encounter a new
>> problem. Current to load not current to battery exsits when the heat pump is
>> not in operation. Though the irradiance during that time is low, but I think
>> the battery bank should be charged when it's not fully charged. Thank you in
>> advance!
>>
>>
>> 2011-03-27
>>  -----------------------------------------
>> Guangzhao Lv
>> ------------------------------
>> *发件人：* David BRADLEY
>> *发送时间：* 2011-03-15  05:05:06
>> *收件人：* lvguangzhao
>> *抄送：* trnsys-users
>> *主题：* Re: [TRNSYS-users] Questions about Type 194 and Type 665
>>  Guangzhao
>>   My apologies for the delay, I am still working on trying to get the
>> parameters for your PV module generated. While Type194 is the preferred
>> model, you could use Type94 for the time being.
>>
>>   As for the mode parameter in Type194, you don't need to worry about it.
>> For a time, we were adding an extra "mode" parameter to all new Types that
>> we wrote just in case we needed it in the future so that we wouldn't run
>> into backwards compatibility problems. Type194 only has one mode.
>>
>>   Lastly, the voltage of your PV array and the voltage of your battery
>> bank typically need to match each other. A battery charge controller can
>> handle some differences but the idea is usually that you want your DC PV
>> array to run at a voltage that is a bit higher than the battery bank voltage
>> so that it can be used to charge the batteries without a step-down voltage
>> converter. The number of cells within a PV module obviously can't be
>> changed. However, the number of modules that you connect in series and
>> parallel can be. Your PV array will run at multiples of about 17.5V, which
>> is about normal for charging a 12V battery system I would think. If you have
>> PVs in series, you would need to also have batteries in series as well.
>> Kind regards,
>>  David
>>
>> On 3/14/2011 08:21, lvguangzhao wrote:
>>
>>  Hello,David,I urgently want to get your help.
>> Following are the parameters I missed.
>> Temperature coefficient of short circuit current = 0.0010 [1/k]
>> Temperature coefficient of open circuit voltage = -0.0038 [v/k]
>> It's a mono-silicon based panel. All of the parameters I sent to you are
>> from the product manual. The test result of open circuit
>> voltage also matches that value.
>> I also want to know which type I should use, type194 or type194b? The
>> parameters of Type194b's seem can be changed. But a message " Only mode
>> 1 has been implemented, mode 2 was created for future updates" is showed in
>> mode card. I'm not sure whether it has been implemented now.
>> I have another question about the capacity of a battery bank. The capacity
>> of a battery bank will not vary with the number of cells in series. So if it
>> means that the cell capacity should vary with the number of cells in series?
>> Best regards!
>>
>>
>> 2011-03-13
>> ------------------------------
>>   Guangzhao Lv
>> ------------------------------
>> *发件人：* David BRADLEY
>> *发送时间：* 2011-03-09  03:24:00
>> *收件人：* lvguangzhao
>> *抄送：* trnsys-users
>> *主题：* Re: [TRNSYS-users] Questions about Type 194 and Type 665
>>  Guangzhao,
>>   I also need to know the temperature coefficient of short circuit current
>> and the temperature coefficient of open circuit voltage. Both of these
>> should be listed on the manufacturer's data sheet. Also, is this a
>> silicon-based panel or some other material? The reason I ask is that silicon
>> cells typically run at about 0.5V per cell so 36 in series would have an
>> open cell voltage more like 18V than 21.5V. Its not impossible of course.
>> Kind regards,
>>  David
>>
>>
>> On 3/8/2011 05:21, lvguangzhao wrote:
>>
>>  Hello, David, thank you very much for your reply.Attached are my
>> project.Following are the parameters that I am trying to enter into the EES.
>> Number of cells in series within a module = 36
>> Open circuit voltage at reference conditions = 21.5 V
>> Short ciecuit current at reference conditions = 7.55 amp
>> Max. power voltage at reference conditions = 17.5 V
>> Max. power current at reference conditions = 6.86 amp
>> Module area = 0.92m2
>> I also have tryed to change some parameters in EXAMPLE.VAR in the folder
>> of Type194 ,but I didn't know what to correct.
>> Thank you in advance !
>>
>>
>> 2011-03-08
>> ------------------------------
>>   Guangzhao Lv
>> ------------------------------
>> *发件人：* David BRADLEY
>> *发送时间：* 2011-03-02  23:04:11
>> *收件人：* lvguangzhao
>> *抄送：* trnsys-users
>> *主题：* Re: [TRNSYS-users] Questions about Type 194 and Type 665
>> Guangzhao,
>>   Could you please send me an email containing the parameters that you are
>> entering into the EES plugin for Type194? I have run into some similar
>> problems in the past and may be able to help solve this one. It sounds from
>> what you describe as though the problem is in launching the plugin, not
>> actually in having the plugin solve so perhaps you only need to send me the
>> Trnsys Studio project that causes the error.
>> Kind regards,
>>  David
>>
>>
>> On 3/1/2011 00:47, lvguangzhao wrote:
>>
>> Hello, I have two questions to ask.
>> 1. I encountered a problem when I was trying to change the parameters of
>> Type 194 using EES. A error "Missing user function or improper format for
>> Call statement" was showed after I clicked on the icon on the parameter
>> card. What's wrong with it?
>> 2. A convertible frequency air source heat pump is needed in my model but
>> I can't find one in TRNSYS. Is Type 665 Ok?
>> 2011-03-01
>> ------------------------------
>>  Guangzhao Lv
>>
>>
>> _______________________________________________
>> TRNSYS-users mailing listTRNSYS-users at cae.wisc.eduhttps://mailman.cae.wisc.edu/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
>>
>>
>> --
>> ***************************
>> 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
>>
>>
>> --
>> ***************************
>> 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
>>
>>
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>
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