I am hoping someone with more experience can confirm / explain the Cimbali Jnr heat exchanger thermodynamics.
My understanding from the diagram below is that water is pumped into the heat exchanger tube and then flows via solenoid through the group.
The group has a very large thermal mass and will remain at a constant temperature.
The heat exchanger tube is a fairly large reservoir which holds approximately (I haven't measured yet) 200-300ml of water.
At steady state this water will be at 100 degrees (boiler temperature).
When cold water enters at the far end away from the group it will force the hot water through the group.
I can't imagine much mixing of the cold and hot before flowing through the group.
So in effect the group has to cool the water down to brew temperature.
Does this sound correct?
My understanding from the diagram below is that water is pumped into the heat exchanger tube and then flows via solenoid through the group.
The group has a very large thermal mass and will remain at a constant temperature.
The heat exchanger tube is a fairly large reservoir which holds approximately (I haven't measured yet) 200-300ml of water.
At steady state this water will be at 100 degrees (boiler temperature).
When cold water enters at the far end away from the group it will force the hot water through the group.
I can't imagine much mixing of the cold and hot before flowing through the group.
So in effect the group has to cool the water down to brew temperature.
Does this sound correct?


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