Ibon wrote:
Most of the pressure relief valves I am seeing on line are rated for 150psi and 210 degree F. Does this mean that the valve only opens at this psi and temp range when the water would actually start boiling? If so is this the right one for this system?
vtsnowedin wrote:Pops wrote:Thanks VT, I was afraid of that
I made a tank for the greenhouse out of a series of 55gal plastic drum and had to order some fittings to go through the sides of the tank, I assume you can make it work through sheeting
http://www.mcmaster.com/#tank-fittings/=sbh92x
Or just get the painted steel tank shown here and stand it upright. http://www.mcmaster.com/#hot-water-stor ... ks/=sbhgxt
The 80 gallon one for $560.05 would work like a charm.
Pops wrote:[
Or take out only the top element and plumb your collector hot return into that fitting and come off the drain valve at the bottom to supply to the collector. That gives you insulated, thermostated, electric back-up heated solar hot water.
Pops wrote:Or take out only the top element and plumb your collector hot return into that fitting and come off the drain valve at the bottom to supply to the collector. That gives you insulated, thermostated, electric back-up heated solar hot water.
Ibon wrote:Pops wrote:Or take out only the top element and plumb your collector hot return into that fitting and come off the drain valve at the bottom to supply to the collector. That gives you insulated, thermostated, electric back-up heated solar hot water.
That is a great idea actually. what I could do is replace the bottom 4500W heating element with a 1500W heating element. On our hydro system we have a dump load that is burning off unused power. It is divided into several 1500W channels. It is about 250 meters from the lodge so for the cost of one small gauge cable from the hydro to the lodge I could put the first of the 1500W dump channels (which is usually dumping power) and connect this to the replaced 1500W lower element of the hot water tank. On those rainy days with no solar heating the 1500W wont cut it but I have the back up on demand gas.
THere are 5 bedrooms in this lodge each with their own hot water shower. Let's imagine the following scenario. 8 guests go out on a walk, it starts to rain, they come back cold and soaked and all want to take a hot shower within the next 30 minutes. How big an electric hot water tank do I need? Is 80 gallons enough and how large would my solar collector surface area need to be to heat 80 gallons of water on a sunny day??
I could also make an extra insulated storage tank and still incorporate the electric hot water tank as Pop's suggest. This idea is good also because I have a 40 gallon one in storage on site that I haven't used since it was draining to much of my hydro power and I replaced this on another cabin with on demand gas.
I have to think this through but good ideas. Thanks
Newfie wrote:Try grainger
http://www.grainger.com/product/EATON-M ... pp%3Dfalse
Or Eaton
http://www.eaton.com/Eaton/ProductsServ ... 259#tabs-1
Or Parker hydraulics
http://ph.parker.com/us/en/fittings
Pops wrote:NPSM have the same thread pitch as NPT but are straight whereas pipe threads are tapered. The fitting you need will have an O ring, like a hydraulic hose to make a seal. It's called ORB for O Ring Boss.
MD wrote:you need a cheap frequency drive connected to a small 3 phase circulating pump motor with a feedback loop from an analog temperature sensor that is positioned at the hottest part of the loop.
less than $400 for the components.
How do you get your hand and wrench inside the glass lined water tank to hold the inside half of that fitting.Scrub Puller wrote:Yair . . . bloody hell fellers, I don't believe this conversation.
The fitting is called a "bush" threaded externally (male) 1" NPT (or BSP) and internally (female) 3/4" NPT (or BSP) . . . just glue a male adapter onto the PVC and you are in business . . . put 1" NPT x 3/4" NPT bush into Google images and thousands are shown.
Or am I missing something?
Cheers.
Scrub Puller wrote:put 1" NPT x 3/4" NPT bush into Google images and thousands are shown.
Or am I missing something?
Cheers.
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