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<font face="Helvetica, Arial, sans-serif">The unit can run at lower
water flows and lower temps and just dehumidify less.<br>
1 GPM @ 120F supply gets about 60 pints per day.<br>
You could run that half the time, I would guess, and have plenty
of drying (30 pints per day is a lot for an airtight properly
ventilated house). Likely would runt it at 1 GPM only when it is
sunny, so limiting run time to 8-12 hrs per day in the middle of
the hottest days.<br>
<br>
There are two factors in pump energy: flow rate, and flow
resistance. It is easy to pump 1 GPM along a horizontal pipe, 2"
in diameter (low flow resistance). But pumping it to the roof,
through a solar panel, with valves, elbows, and couplings, back
through a storage tank, maybe even a heat exchanger, will use a
lot more power.<br>
Equation below<br>
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BrakeHorsePower=
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</style>where efficiency is around 12-20% for small normal pumps (like a
Taco or Grundfos), and as high as 35% for high tech bigger ones.<br>
Electric draw in W: Pump horsepower * 765 /motor efficiency<br>
motor efficiency on new units is in the 0.90 range for modern
motors.<br>
<br>
<br>
<div class="moz-signature">Dr John Straube, P.Eng. <br>
<a class="moz-txt-link-abbreviated" href="http://www.BuildingScience.com">www.BuildingScience.com</a></div>
<br>
On 12-06-12 7:53 AM, Gennaro Brooks-Church - Eco Brooklyn wrote:
<blockquote
cite="mid:CAPV9BxPJvvpG5M=uM6f8k0Q3vOWsZeLBjJxkACasff4mWCNxiw@mail.gmail.com"
type="cite">I just bought a 600 GPH pump that uses 35W so a 1-2
GPM (60-120 GPH) pump uses 3.5-7W if it is as efficient as my very
efficient pump? I guess you have to balance that impact with the
effect.<br clear="all">
Gennaro Brooks-Church<br>
Director, Eco Brooklyn Inc.<br>
Cell: 1 347 244 3016 USA<br>
<a moz-do-not-send="true" href="http://www.EcoBrooklyn.com"
target="_blank">www.EcoBrooklyn.com</a><br>
22 2nd St; Brooklyn, NY 11231<br>
<br>
<br>
<br>
<div class="gmail_quote">On Mon, Jun 11, 2012 at 10:38 PM, Philip
Proefrock <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:architect@cornellbox.com" target="_blank">architect@cornellbox.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
This sounded intriguing to me, so I took a look at the cut
sheet Prof.<br>
Straube shared. That shows a requirement of 1-2 GPM (not just
1 gallon<br>
per hour), which is a big difference. I assume this water is
being<br>
recirculated in some fashion (and this is just a flow rate
needed), and<br>
not just getting dumped, but it's much less compelling than it
seemed at<br>
first.<br>
<br>
Regards,<br>
<br>
Philip Proefrock<br>
<div class="im HOEnZb"><br>
On 6/11/2012 3:00 PM, John Straube wrote:<br>
> Attached is a cut sheet for the only wheel based system
we could find when we looked 2 years ago.<br>
> it uses hotwater to regen the dessicant. Takes about 1
gallon per hour at 120F to remove 60 pints per day (a tight
house with ERV will generally need less than half this
amount of dehumid.<br>
> This would require a pretty decent solar hotwater
system to drive it.<br>
<br>
<br>
</div>
<div class="HOEnZb">
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<pre wrap="">_______________________________________________
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