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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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.

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Heating and cooling: How much of a difference do better heating controls make?

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      CommentAuthordjh
    • CommentTimeFeb 7th 2016
     
    Posted By: alecNo, I am saying they only start shutting down when the room temperature is heading for over shoot

    and I'm saying that overshoot of the control does not by itself mean overshoot of the controlled condition. If I wanted 21°C with such a TRV, I would simply set it to 20°C or whatever actually delivered the temperature I wanted. And sure, a bang-bang mechanical control is never going to behave like a fully programmed digital control, but then an apple is never going to taste like an orange.
    • CommentAuthorSimon Still
    • CommentTimeFeb 8th 2016 edited
     
    Posted By: djh
    Posted By: alecNo, I am saying they only start shutting down when the room temperature is heading for over shoot

    and I'm saying that overshoot of the control does not by itself mean overshoot of the controlled condition. If I wanted 21°C with such a TRV, I would simply set it to 20°C or whatever actually delivered the temperature I wanted. And sure, a bang-bang mechanical control is never going to behave like a fully programmed digital control, but then an apple is never going to taste like an orange.


    Isn't the real issue that a TRV will overshoot in both directions. Set it lower and you're reducing the 'minimum' room temperature before the TRV calls for heat again and the time the the system takes to reheat.


    >>A slightly varying temperature may even be *more* comfortable than a steady temperature.

    Yes, it's lovely alternating between being slightly too hot and slightly too cold. The open fire effect - "I'm cold, throw on another couple of logs"


    >>How much electricity do the smart control systems consume? Anyone know?

    Negligible. Evohome seems to work off AA rechargeables.

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