[Bldg-sim] Hourly Solar Hot Water modeling program

[Karen Walkerman]

There are also the SPF tests, which give the same parameters, but again, not
B and E.

Thanks,

--
Karen

On Wed, Jul 29, 2009 at 11:54 AM, Karen Walkerman <kwalkerman at gmail.com>wrote:

> Hi All,
>
> Thanks for all the responses.  I will probably use WATSUN for this project,
> but could use a hand with something:
>
> for "Collector Test Data" the program requires that I enter in some test
> parameters for the solar panel:
>
> A (no units)
> B (1/C)
> C (W/m2/C)
> D (W/m2/C2)
> E (W/m2)
>
> This data is used in the following formula:
>
> Q = Area ((A + B dT) Akt H - (C + D dT) dT - E)
>
> where:
>
> Akt is the incidence angle modifier
> H is the incoming solar radiation
> dT is the temperature difference between the collector inlet and ambient
> air
>
> The help file indicates that I should be able to get these numbers from the
> manufacturer or from a testing agency, however, the data I have found
> includes variables A, C and D, but not B and E according to test
> EN-12975-1,2:2004.  Unfortunately the Help file gives no indication of what
> test these numbers should come from or any other information.
>
> Can anyone give me a hand here?
>
> Thanks,
>
> --
> Karen
>
>
> On Wed, Jul 29, 2009 at 11:26 AM, B. Fountain <bfountain at greensim.com>wrote:
>
>> Karen,
>>
>> Transys is ideal for that type of analysis.  Another (cheaper) option to
>> consider would be WATSUN from Natural Resources Canada.  It comes with
>> .TMY for Canadian sites -- I do not know about compatibility with US .TMY
>> data.  Price is right though.
>>
>> WATSUN is available (for free) here:
>>
>>
>> http://canmetenergy-canmetenergie.nrcan-rncan.gc.ca/eng/software_tools/watsun.html
>>
>> I have not played much with it but it does produce hourly results to a
>> text file. Note that it only uses SI units.
>>
>> Cheers,
>> Brian
>>
>> > <Is anyone aware of a program that can model hourly outputs for a solar
>> > hot water system?  I would prefer something that can accept a TMY2 or
>> TMY3
>> > weather file and just gives me the hourly heat output based on SHW
>> panel,
>> > inlet and outlet temperatures, angle and azumith.  I'll handle the load
>> > side, including thermal storage, etc.>
>> >
>> > In my opinion, TRNSYS is probably the best program to handle your stated
>> > solar domestic hot water simulation needs - at timesteps of an hour all
>> > the way down below a second if you need that type of resolution.  But it
>> > can also do the entire balance of system (thermal storage, controls,
>> > interaction with the building, etc.). However, it's a bit on the pricey
>> > side if you're only going to be using it for one project.
>> >
>> > Give us a call if you'd like to discuss your project.  We do a lot of
>> > solar thermal projects and could help answer some of your modeling
>> > questions.  Good luck with your project.
>> >
>> > Jeff
>> >
>> >
>> > Jeff Thornton
>> > President - TESS, LLC
>> >
>> > 22 North Carroll Street - Suite 370
>> > Madison WI 53703 USA
>> >
>> > Phone: 608-274-2577
>> > Fax: 608-278-1475
>> > E-mail: thornton at tess-inc.com
>> > Web: www.tess-inc.com
>> >
>> > _______________________________________________
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>>
>>
>>
>
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