[RE-wrenches] solar hot water nighttime recirc

[Darryl Thayer]

HI Yes you are correct, a panel will lose less than they collect.  BUT the Frul will tell you the amount of loss you could expect.  If no one calculates I will do it early next week.  
Darryl 

--- On Fri, 12/18/09, Carl Emerson <freepower at freepower.co.nz> wrote:

> From: Carl Emerson <freepower at freepower.co.nz>
> Subject: Re: [RE-wrenches] solar hot water nighttime recirc
> To: "'RE-wrenches'" <re-wrenches at lists.re-wrenches.org>
> Date: Friday, December 18, 2009, 9:04 PM
> 
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> Hi there
> gang,
> 
>  
> 
> Just to say
> that IMHO solar thermal panels
> will radiate quite a bit less than they collect, someone
> must have some data on
> this ??
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> Have a
> great Christmas.
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> 
> Carl
> Emerson
> 
> Free
> Power Ltd.
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> Web  
> www.freepower.co.nz
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> From:
> re-wrenches-bounces at lists.re-wrenches.org
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Conrad Geyser
> 
> Sent: 18
> December 2009 5:42 p.m.
> 
> To:
> nponzio at buildingenergyus.com;
> 'RE-wrenches'
> 
> Subject: Re:
> [RE-wrenches] solar
> hot water nighttime recirc
> 
> 
> 
>  
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> Nicholas,
> 
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> You
> can certainly do
> that.  Most newer controllers have a
> “vacation” function that
> will provide this.  Another method is to put in a
> bypass to the check
> valve that you can open and the system will naturally
> reverse thermo siphon at night.
>  Not much in the way of calculations other than the
> collectors reradiate
> as effectively as they collect.
> 
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> 
> Conrad
> 
> Cotuit
> Solar
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> From:
> re-wrenches-bounces at lists.re-wrenches.org
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Nicholas Ponzio
> 
> Sent:
> Wednesday, December 16, 2009
> 10:54 PM
> 
> To:
> RE-wrenches
> 
> Subject:
> [RE-wrenches] solar hot
> water nighttime recirc
> 
> 
> 
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> 
> Apologies if this has
> already been discussed here.
> 
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> 
> One heat diversion method I hear suggested often is
> recirculating through the
> collectors (flatplate) at night. Are there any data,
> calculations or anecdotal
> evidence on the effectiveness of this approach? That is,
> can I really radiate
> as much energy back to a dark sky as I collect during the
> day?
> 
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> Thanks for any feedback.
> 
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> 
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