julianf
Member
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- 8,510
- Location
- devon, uk
We have a gledhill thermal store here.
The Rayburn thermosyphons into it. The dhw runs through a big coil within the store and is, effectively, heated in demand.
There is a thermostatic mixing valve at the end of this coil, just to bring the temperature back down to non-danger levels.
What I want to do is fit a flat plate heat exchanger (3/4" threads) between the output of this dhw coil and the thermostatic mixing coil.
Why? Because if the store is not hot, I want to be able to turn on the oil fired boiler and pump hot water through the plate heat exchanger and heat the dhw (post coil).
Any remaining heat in the thermal store will get scavenged and partially preheat the water passing through the coil. The thermostatic mixing valve (post coil, post plate heat exchanger) will bring the water back to safe temperatures again before it goes on to the taps.
I've thought about this quite a lot, and this is what I want to do. This question is not "is this a good idea" - I mention the plan simply for background! : )
My problem -
What on earth is this connection -
Some sort of 26mm compression fitting??
The output from the store is actually 22mm and then it's adapted up. But its all factory brazed together and I don't really want to be messing with it.
Basically I just want to insert my 3/4" parallel fphe terminals between that 26mm pipe and the mixing valve. I wasn't expecting oddness.
I'm hoping it's not odd at all to someone who knows and the can just tell me that I need xyz fitting and it will all be good!
Thank you!
The Rayburn thermosyphons into it. The dhw runs through a big coil within the store and is, effectively, heated in demand.
There is a thermostatic mixing valve at the end of this coil, just to bring the temperature back down to non-danger levels.
What I want to do is fit a flat plate heat exchanger (3/4" threads) between the output of this dhw coil and the thermostatic mixing coil.
Why? Because if the store is not hot, I want to be able to turn on the oil fired boiler and pump hot water through the plate heat exchanger and heat the dhw (post coil).
Any remaining heat in the thermal store will get scavenged and partially preheat the water passing through the coil. The thermostatic mixing valve (post coil, post plate heat exchanger) will bring the water back to safe temperatures again before it goes on to the taps.
I've thought about this quite a lot, and this is what I want to do. This question is not "is this a good idea" - I mention the plan simply for background! : )
My problem -
What on earth is this connection -
Some sort of 26mm compression fitting??
The output from the store is actually 22mm and then it's adapted up. But its all factory brazed together and I don't really want to be messing with it.
Basically I just want to insert my 3/4" parallel fphe terminals between that 26mm pipe and the mixing valve. I wasn't expecting oddness.
I'm hoping it's not odd at all to someone who knows and the can just tell me that I need xyz fitting and it will all be good!
Thank you!