[RE-wrenches] Pt valves as overheat control

[Karl Schwingel]

I've seen Tarm Boilers set up to thermosyphon to 30-40 feet of fin tube
in the event of a power outage. there's a normally open zone valve
(caleffi makes a wide variety of actuators for their zone valves,
including 3 way zone valves, but no DC actuators) that will allow
thermosyphoning when the power goes out. important with a super pricey
wood gasification boiler in the country.

I'd probably do something like that with my woodstove loop. hoping to do
that with my stove here someday.

Karl


-- 
Karl Schwingel
NABCEP Certified Solar Thermal Installer
NorthWind Renewable Energy LLC

PO Box 723 Stevens Point, WI 54481
Karl at Northwindre.com
Cell: 715 209 0446
Fax : 715 952 4501





Roy Butler wrote:
> Hi guys,
>
> I have been using the SS water loop in my Amish wood cookstove
> for my domestic hot water for 9 years now. My tank is a 40 gallon
> electric water heater (space saver unit) and is configured for thermo
> siphon operation.
>
> The P/T valve is all I have for protection and I have to be honest,
> I kind of knew this was probably not a great idea right from the start!
>
> But it works....the valve opens up and discharges into a piping system
> located under a raised bed planting area in our attached green house.
> So we get the benefit of the 'waste' heat. The valve opens, on average,
> about 1 or 2 times a week during the coldest part of the winter.
>
> I replace the P/T valve every other heating season because it does
> begin to weep a bit. So that may be what's saved my ignorant butt
> from being blown to bits.....maybe.
>
> My question....is there a more robust version of that P/T valve
> that I should be using? Something that you would use in a boiler perhaps?
>
> I'm hoping to not have to change the system too much....I love the
> long, guilt free showers....more so because the electricity for the
> pump comes from my off-grid hybrid system.
>
> I'm so much better at PV and wind systems....hot water scares me!
>
> Roy Butler
> NABCEP Certified Solar PV Installer?
> NYSERDA eligible PV & wind installer 
> Four Winds Renewable Energy, LLC
> 8902 Route 46
> Arkport, NY 14807
> 607-324-9747
>
> www.four-winds-energy.com
> www.nationalsolarsupply.com
>
> Although no trees were killed in the sending of this message, 
> a large number of electrons were terribly inconvenienced.
>
>   
>
>
> Todd Cory wrote:
>> Sure, but the discussion was about preventing hot water storage tanks
>> from exploding. Putting BTUs into a tank, whether that be from a wood
>> stove loop or 5 kW electric heating element is not the issue. Relying
>> on a P/T valve to regulate overheating is of course not a good idea,
>> but it will prevent the tank from exploding.
>>
>> Todd
>>
>>
>>
>> Conrad Geyser wrote:
>>>
>>> Todd,
>>>
>>> I’m afraid that any PT valves that I’ve ever known have continued to
>>> weep indefinitely after one or two overheat triggers.
>>>
>>> I would not recommend relying on them for heat control devices.
>>>
>>> Conrad
>>>
>>> Cotuit Solar
>>>
>>> NABCEP thermal cert.
>>>
>>
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-- 
Karl Schwingel
NABCEP Certified Solar Thermal Installer
NorthWind Renewable Energy LLC

PO Box 723 Stevens Point, WI 54481
Karl at Northwindre.com
Cell: 715 209 0446
Fax : 715 952 4501


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