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DHW heater for college Rec Fitness center - Page 2

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Posted by Steve Shantz on November 17, 2008, 12:36 am


I've looked at the GFX technology quite closely.  The problem in this
application is that the showers are on the ground floor, with no
basement or access to the drain system from below.  I have wondered
about this for some of the other dorms and for the dishwasher in the
cafeteria.  In both cases, I don't have quite enough height, and the
waste water would need to be pumped back up to the level of the sewer


Posted by Morris Dovey on November 17, 2008, 4:45 am
Steve Shantz wrote:

I've been trying to visualize how the building is laid out. It looked as
if the pool area might be at the west end of the building. Is that
correct and if so, where are the showers relative to that? (I can't
really tell much from the satellite view or the campus tour views.)

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

Posted by Steve Shantz on November 18, 2008, 3:37 am

For those of you who have looked up Goshen College on Google Earth,
the Rec Fitness Center is on the south end of the campus, directly to
the east of the railroad tracks and north of the baseball fields.  The
pool is the north-west segment of the building, facing north and west.
The south end of the pool roof is mechanical space, above which we
would mount the collectors.  The roof is standing seam, pitched just
slightly to the west for drainage, which is just perfect for draining
the collector manifolds in a drainback system.

My biggest questions right now are how to mount the arrays to the
roof.  Our facilities people don't want the collectors and a whole
bunch of roofing to turn into an expensive kite when the first big
wind storm comes up.  I've seen the aluminum blocks that clamp to the
seams, but what would prevent the whole section of roof from being
pulled up in a high wind?  One option is to install some beams above
the roof, with penetrations through the roof, and welded or bolted
onto the large supporting beams directly under the roof.  Another
option is beams on the roof clamped to the seams, but extending out
about 10 - 15 feet north and south of the collectors. Maybe with a few
bags of sand on the ends to prevent them from lifting.

How about the back supports? 1 1/4" or 1 1/2" square aluminum or steel

Does anybody know who can design such a structure?  How have other
people fastened large arrays to roofs? Something tells me this might
be a job for engineer$$$$.

Any help here would be appreciated.


Posted by Morris Dovey on November 18, 2008, 8:39 am
 Steve Shantz wrote:

Good info - and it looks as if what you want to do has been well
thought-out and should be workable.

Even if you had the perfect design, I think due diligence considerations
would require some kind of engineering approval.

Without knowing anything at all about Goshen's administrative culture,
I'll suggest that if you bait your hooks properly, you might be able to
get some first class free engineering help from Purdue and Rose-Hulman
ME and Civil Engineering departments in return for well-earned bragging
rights. Then let your expensive engineer select the better plan (and
modify it if he deems necessary).

You might even consider allowing the students and faculty advisor of the
winning engineering team to do some of the work and photograph/video
record the process for posterity (and the winner's admissions department).

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

Posted by dhruv on November 17, 2008, 1:28 pm
Consider using 4 10 ft satellite dishes with solar tracking. The ones
you use for CU band stations. 4 of these will
be able to heat 1500 gallons of water a day. The good part is you get
maximum temperature in about 2-3 minutes.
So even if you have 2-3 hours of clear sunlight you will be able to
heat the water .

The dishes can be installed with the help of students. It should cost
you approx $000 per dish if you put the labour yourself. You could
start with 2 and then add more.

Let me know if you want more details. I have a working prototype for a
6ft dish in MA. If you put
solar dish collector  as the key word in you tube you can see my
video. My user name is mdhruv.


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