SDHW overheat loop/window insulation [RE-wrenches]

[Jay Peltz, Peltz Power]

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On May 18, 2005, at 5:40 AM, Conrad Geyser wrote:

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> Carl,
>     I already explained that you don't.  The system will self  
> regulate by
> losing more and more heat to parasitic losses as temperature  
> increases until
> the gain is practically zero.  The pipe runs, tank, circulator etc.  
> all lose
> heat.  If the occupants are away on summer vacation and not using  
> any hot
> water, I usually tell them to leave the circualtor on 24 hours as  
> this will
> help dump heat at night (at least out of the bottom of the tank)  
> and keep
> the max temp. a little less crazy.
>     One thing to note is that conventional hot water tank
> Pressure/Temperature relief valves will weep once the tank temp.  
> goes over
> ~160F.  Code doesn't recognize this and doesn't provide for an  
> alternative
> so you have to make your own....
>     Glycol systems should not have any overheat shut downs becuase  
> the fluid
> will boil in the panels.  This breaks down the glycol with time.  They
> should just go right on circulating.
>      PV driven ones will go on circulating past when they should if  
> they're
> not controlled, and the 30 VDC controller is expensive (but very  
> nice).
>
>     On the window question, does anybody have a favorite night time
> insulation?  I just installed some symphony shades and was a little
> dissapointed with how much space there is around the edges.  I  
> actually have
> made my own automatic night cover using tekfoil (bubble pack) along  
> the
> lines of what Jay was looking to do on his panels.  It's a big  
> cover for the
> solar gain front on my shop using awning track and sail bolt rope.   
> Works
> great.  Gearmotor/limit switch/timer controlled.
>
>     Thanks for all the great discussion!
>
> Conrad Geyser
> Cotuit Solar
> ----- Original Message -----
> From: "Carl Emerson, Free Power Ltd." <freepower at freepower.co.nz>
> To: <RE-wrenches at topica.com>
> Sent: Wednesday, May 18, 2005 5:29 AM
> Subject: RE: el sid question [RE-wrenches]
>
>
>
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>>
>> Can someone explain why there is a need to have overheat  
>> protection at all
>> if the loop is all copper, the fluid is 50% glycol, there is an  
>> expansion
>> tank in the circuit, the panels are built to stand the  
>> temperatures and
>> pressures, and the loop is pressurised to prevent a boil ???
>>
>> This situation will happen every time there is sufficient sun and  
>> a power
>> failure.
>>
>> In the case of a PV powered pumping system the solar supply should be
>> controlled by an over temp. thermostat.
>>
>> What are we trying to protect ???
>>
>> Carl Emerson
>> Free Power Ltd.
>> Auckland N.Z.
>>
>>
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