Green Building Bible, Fourth Edition |
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These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment. PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book. |
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Posted By: bhommelsPosted By: SimonD
I think a lot of people make the mistake to think that a thermal store functions in the same way as a dhw water cylinder and assume that reducing the storage temp is going improve energy efficiency. Thermal stores are designed to function at about 75C with the outlet dhw temp regulated by a thermostatic mixing valve.
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Like I've said before, this stuff is all a question of balance and context of use.
All good points! My thermal store is set to 52C when the boiler has to heat it, and for solar it goes up to 70+ deg C. I have removed the mixing valve and put a thermostatic valve in the primary circuit with the sensor at the DHW output so that the pump gets pinched off when DHW temperature is reached.
With this setup I can run it at lower T, reducing standing losses when energy is not 'free'. The boiler T sensor sits in the lower half of the tank so that it jumps in before the store is depleted. It was a bit of trial and error to get it to work properly I must admit.
Posted By: DJHDS18B20 temperature sensor? Solid-state relay or contactor? Plus a small computer - pi or arduino?
Posted By: PeterStarck
That's really interesting. I am trying to decide whether to use a UVC or a TS and the only thing putting me off a TS was having to heat it to 70C plus with the boiler in winter. Do you have a schematic of your plumbing setup that you are willing to share as it would be very useful.
Posted By: bhommelsLet's see if I can attach a drawing...
That's great, many thanks.