[Bldg-sim] Resfen HVAC type

[Carol Gardner]

I concur with Robin's suggestion.
Carol

On Mon, Apr 12, 2010 at 1:31 PM, Robin Mitchell <rdmitchell at lbl.gov> wrote:

>  Alex –
>
>
>
> Rather than trying to force RESFEN to model something that it is not
> designed to do, I would suggest that you move to a more fully featured
> simulation program.
>
>
>
> Robin
>
> *******
>
> Robin Mitchell
>
> Windows & Daylighting Group
>
> Lawrence Berkeley National Laboratory
>   ------------------------------
>
> *From:* bldg-sim-bounces at lists.onebuilding.org [mailto:
> bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Alex Krickx
> *Sent:* Friday, April 09, 2010 9:11 AM
> *To:* Carol Gardner
>
> *Cc:* bldg-sim at lists.onebuilding.org
> *Subject:* Re: [Bldg-sim] Resfen HVAC type
>
>
>
> Hi Carol,
>
>
>
> Thanks for your response. Looking through the user manual, RESFEN is based
> on DOE2.1e (nice call!)
>
>
>
> Resfen has 2 options to choose from: Gas Furnace+AC  and Electric Heat
> Pump. From what I read online (
> http://windows.lbl.gov/software/resfen/faq/50_faq.htm#HVAC%20MODELING)
> RESFEN 5 does not model electric resistance heating, but rather models the
> buildings with a Furnace+AC system and then converts the energy consumption
> using expected heat pump performance to determine final electric
> consumption. I *think *what you came across is the conversion from the
> furnace system to the heat pump system. The website also takes into account
> the efficiency of the furnace as it reverse-engineers the expected heat pump
> consumption. The efficiencies are 70% for existing construction and 78% for
> new (which are similar to the numbers you came up with).
>
>
>
> I may still be able to edit the piece of code that you describe but as I’m
> also neither a programmer or a developer it makes me a little nervous to do
> so.
>
>
>
> In any case, thanks for your response and if I have any success I’ll share
> it with the list.
>
>
>
> Regards,
>
> Alex Krickx
>
>
>
> *From:* Carol Gardner [mailto:cmg750 at gmail.com]
> *Sent:* Thursday, April 08, 2010 5:28 PM
> *To:* Alex Krickx
> *Cc:* bldg-sim at lists.onebuilding.org
> *Subject:* Re: [Bldg-sim] Resfen HVAC type
>
>
>
> Alex,
>
> With the caveat that I am not a programmer or a developer and with some
> trepidation I will say I think I know where you should go at least. The
> first part is a programming language, see above, but the last part looks
> like DOE2 BDL. It is probably from DOE2.1e since it's from LBNL. So going
> way back in the memory banks and scrolling down, down, and further down
> there is something labeled:
>
> ##if #[Vintage[] eqs New ]
>
>    FHIR=1.3550   CEIR=.3703
>
> ##elseif #[Vintage[] eqs Exist ]
>
>    FHIR=1.5015   CEIR=.41667
>
>
> I'm pretty sure that FHIR is what you want and if my memory serves, a big
> if, it represents 1/eff so the first one, age New, would be 79.7%, and the
> second one, age Exist, would be 66%. Since this kind of makes sense, I might
> be right! If I'm not, hopefully someone who knows more will correct me.
>
> Maybe you can verify this by changing it. I've never used RESFEN myself.
>
> Let me know what happens.
>
> Carol
>
> On Thu, Apr 8, 2010 at 3:46 PM, Alex Krickx <akrickx at seriousmaterials.com>
> wrote:
>
> Hello all,
>
>
>
> I have a question about RESFEN that I’m hoping this list can help me get my
> head around. RESFEN is developed and maintained by LBNL and I believe runs
> off the DOE2 engine. The software is simple to use because of its limited
> inputs, however I want to change one of those restricted inputs.
>
>
>
> I’m trying to change the boiler performance which I *think *I can do by
> editing the building description file (which RESFEN labels as a .d2 file).
> I’ve attached the file and saved it in a .txt format for all to see.
>
>
>
> My question is: Can someone proficient in the DOE2 language help me
> decipher where and how to edit the efficiency of the boiler in the attached
> file? I don’t know the part load, just that the boiler in question operates
> at 60% efficiency. If this is to broad a question please let me know and I
> will attempt to clarify.
>
>
>
> Thanks in advance!
>
> Alex Krickx
>
>
>
>
>
> Alex Krickx
>
> Building Energy Specialist
>
> [image: email_sig]
>
> 1250 Elko Dr, Sunnyvale, CA 94089
>
> (t) 408.541.8124
>
>
>
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