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re: is efficiency dangerous ?
25 aug 2005
t38 wrote:
>the tank would probably be an old hot water heater with the outlet of
>the collector going into the p&t opening and returning to the collector
>via the drain valve at the bottom of the heater.
and the collector?
>...i've heard that p&t valves start to leak after a few cycles. also,
>i have to truck my water in so water conservation is very important
>to me.
you might enjoy distilling wastewater in a multi-effect greenhouse.
>> and explodes the collector? :-)
>
>do you really think that 1/4" copper painted black would explode if
>left out in the sun?
maybe. what's the vapor pressure at your expected max temp?
>also, i have a pressure tank further upstream of the heater that
>i imagine would prevent catastrophe.
sounds good.
>> you might limit the max temp with an extra loop at the top, just
>> above the normal collector fluid level, which allows the collector
>> fluid to flow back down to the collector via some fin tube pipe when
>> the fluid expands at a high temperature.
>
>i like that idea, i could use my auto thermostat to open up and create
>a bypass loop...
i was thinking of something simpler than that, kinda like this, in
a fixed font:
---
| | expansion tank
---
|
..... overtemp fluid level
|
--->---|
..|.......|.. normal fluid level
| |
----<----tank-----<--| -
| normal path | - overtemp path
| | -
| | - fin tube
| | -
|---->--collector-->-- |
| |
-------------------------<---
nick
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