[Bldg-sim] Resfen HVAC type

Alex Krickx akrickx at seriousmaterials.com
Fri Apr 9 09:11:07 PDT 2010


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<mailto: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
[cid:image001.jpg at 01CAD7C1.7C152160]
1250 Elko Dr, Sunnyvale, CA 94089
(t) 408.541.8124

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