[bldg-sim] about pv simulation

Jeff Haberl jeffhaberl at tees.tamus.edu
Sun May 7 19:06:47 PDT 2006


A couple of good points in your colorful email. 

Yes. We have a thesis on PV/T as well, (Sakara Rasisuttra) including test bench data of a triple effect PV/T panel (electric, solar heating, and night-time radiant cooling). 

Unfortunately, the data show that you're better off not to combine things since this would mean an unglazed collector that is not very good at collecting useful heat when it gets cold, or at radiating heat at night. Furthermore, you need enormous area, even at near horizontal orientation covering a roof, which gets worse is the BIPV has a vertical orientation, that is off-south.  

You're better off with high efficiency components that do one thing well. Furthermore, you may need special-purpose, cascade systems to squeeze the Btus out of the thermal stream before returning to the collector. 

I myself am looking forward to the multi-spectral systems going into production. The expected 30 - 40 % efficiency will turn the tide for PV. 

Jeff
BB 8=!  8=)  :=)  8=)  ;=)  8=)  8=(  8=)  :=')  8=)  8=)  8=? BB

Jeff S. Haberl, Ph.D., P.E.............................jhaberl at esl.tamu.edu

Professor......................................................Office Ph: 979-845-6507

Department of Architecture.......................Lab Ph: 979-845-6065 

Energy Systems Laboratory.......................FAX: 979-862-2457 

Texas A&M University..............................77843-3581

College Station, Texas, USA.......................URL: www-esl.tamu.edu

BB 8=/  8=)  :=)  8=)  ;=)  8=)  8=()  8=) 8=?  8=)  8=)  8= BB
 

-----Original Message-----
From: bldg-sim at gard.com
To: bldg-sim at gard.com
CC: BLDG-SIM at gard.com
Sent: Sun May 07 19:04:42 2006
Subject: [bldg-sim] about pv simulation

Of Course!! If 650 W/m**2 direct beam lands on horizontal patch June 
21st, and.........
we use the newest Cyprus Semiconductor PV cells - whopping 20% efficient,
we get an additional  130 W. That is load avoided plus power produced >>
780 W difference from doing nothing.  PV is VERY expensive  unless you
need  no-moving-parts reliability, so maybe it should include lower cost 
augmentation ---
moving am/pm wing reflectors,  and/or seasonal tilt when it's not in 
space.......

BTW a good ammonia superheated cycle will
crank out  35 -- 38% with an ~ 8:1 concentrating collector........
I'll take the NH3 at over 100 kW output.

PV has political merit, BIPV even more,,,,,,,,
Why not call these things  Photovoltaic /Thermal  -- PV/T collectors ??
Is that  thesis on line somewhere ??

John R Ross  P.E.
Westwind Corporation
Vienna, Virginia

Jeff Haberl wrote:

>PVFCHART and DOE-2 can be used in combination. There's a PhD thesis on this by Keith Sylvester at Texas A&M. It shows you actually save more $ on the cooling reduction from the shade from the BIPV than the electricity generated. 
>
>Jeff
>BB 8=!  8=)  :=)  8=)  ;=)  8=)  8=(  8=)  :=')  8=)  8=)  8=? BB
>
>Jeff S. Haberl, Ph.D., P.E.............................jhaberl at esl.tamu.edu
>
>Professor......................................................Office Ph: 979-845-6507
>
>Department of Architecture.......................Lab Ph: 979-845-6065 
>
>Energy Systems Laboratory.......................FAX: 979-862-2457 
>
>Texas A&M University..............................77843-3581
>
>College Station, Texas, USA.......................URL: www-esl.tamu.edu
>
>BB 8=/  8=)  :=)  8=)  ;=)  8=)  8=()  8=) 8=?  8=)  8=)  8= BB
> 
>
>-----Original Message-----
>From: BLDG-SIM at gard.com
>To: BLDG-SIM at gard.com
>Sent: Wed Apr 26 19:23:25 2006
>Subject: [BLDG-SIM] about pv simulation
>
>dear all, i am trying to do simulation for bipv and bipv/t in residential buildings for annual eletricity yield and energy efficiency.
>what programs are available for that research purpose? is espr suitable or should i use pv program PV sol or PvSyst?
>is espr good for that simulation? 
>it will be highly appreciated if you can give any suggestion
>best regards,
> 
>matthew
> 
>  
>


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