Drainback vs. Closed Loop Circulators [RE-wrenches]

[Tom Lane]

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you are offbase about drainback power requirements versus glycol gator tom
----- Original Message ----- 
From: "Todd Cory, Mt. Shasta Energy Services" <toddcory at finestplanet.com>
To: <RE-wrenches at topica.com>
Sent: Friday, May 19, 2006 4:22 PM
Subject: Re: Drainback vs. Closed Loop Circulators [RE-wrenches]


>
> I hope Jeff Lane steps in on this one.
>
> I have seen bad experiences with evacuated tube collectors. They are 
> fragile and the performance gain is not worth it unless you are trying to 
> make steam. Flat plate collectors are heavy and take 2 to 3 people to lift 
> them on the roof, but they last forever.
>
> Drainbacks are more efficient in terms of heat transfer, but the energy 
> for pumping is MUCH higher than a closed glycol loop. It is probably a 
> toss up as to which is better. What do others think about this?
>
> Todd
>
>
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