Charging pumps and air ellimination techniques[RE-wrenches]

[Darryl Thayer]

Hi to all 
I use the teel 1/2 Hp pump also, I pump anti-freeze
from a bucket pump through the system and return to
the bucket.  I let the pump run until the fluid coming
from the system runs clear.  Then I close the valves
such as to pressurize the system from the teel pump. 
I also do not use high vents with this technique.  I
do however use the old air scoop or expansion in the
pipe and an auto vent valve.  be sure to have adequate
expansion volume and pressure relief.

--- "Bill Loesch, Saint Louis Solar"
<bill_loesch at compuserve.com> wrote:
> Hi Brian,
> 
> One good way to remove air from your closed loop
> system is to pass a
> _large_ volume of water through your system. The air
> bubles get caught in
> the flow and get expelled in your bucket reservoir.
> Lacking a large flow
> pump perhaps you could fill from the top (actually
> fill under pressure so
> you overfill, so as to allow for the reduction in
> volume the vented air
> will produce.) Use the circulating pump move the
> fluid past the high vent. 
> 
> I've seen larger systems installed recently by
> someone who "worked in the
> solar industry in the 80's" using the antiquated air
> scoop with float
> valve. While a microbubble seperator (sometimes
> refered to as a coalescing
> filter) is definately more money than a float valve
> mabe even more money
> than the air scoop and float valve combo, I would
> not even consider a
> system without using one of these devices.
> Substitute this problem solver
> for the high vent and stop even entrained air
> remaining in the system.
> 
> Bill Loesch 
> Solar 1- Saint Louis Solar
> 314 631 1094
> 
> 
> Message text written by
> INTERNET:RE-wrenches at topica.com
> >
> Wrenches,
> 
> What pumps or other techniques are you using for the
> initial system fill
> for 
> closed loop solar hot water? We are currently using
> a Teel 1/2 hp 
> centrifugal utility pump and we have to turn it on
> and off repeatedly 
> because the flow drops off after a few seconds even
> when there is no 
> pressure in the loop. It takes a long time to get
> the air out of a
> system 
> this way. Not to mention it's frustrating. Would a
> positive displacement
> 
> pump solve this?
> 
> Thank you,
> 
> BRIAN VICK
> Whidbey Sun & Wind
> Renewable Energy Systems
> 360-678-7131
> brian at whidbeysunwind.com
> 987 Wanamaker Rd
> Coupeville, WA. 98239 



		
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