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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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Renewable Energy: where is the temperature sensor located ?

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    • CommentAuthorleilei
    • CommentTimeJan 6th 2009
     
    Hi there,
    I noticed almost all heat pump manufacturers would claim the water could be heated up to 55 or even 65C ,does anyone know is this the temp. of water coming out the water tank ? . or it is the temp. of water measured at the outlet of heat exchanger assuming there is just a plain water tank connected to the heat pump ( no coil, no special features inside the tank ) .
    if they are talking about the temp. of water inside the tank, where is the temperature sensor located ? because I think a different location results in a different value ? ( please correct me if I am wrong )
    Cheers,
    leilei
    • CommentAuthorDavipon
    • CommentTimeJan 6th 2009
     
    Generally temps quoted by manufacturers are at heat exchanger.Your tank really would be better with 1 coil at least for adding solar or the like at a later date!The tank sensor would be on tank or in little tubes open to outside going into tank .
    • CommentAuthorleilei
    • CommentTimeJan 7th 2009
     
    Hi Davipon,
    Thanks for your input. pardon my ignorance, " your tank really would be better with 1 coil at least for adding solar or the like at a later date !" I dont get this -- do you mean if, say a radiator to be connected to the heat pump unit, the heating system is used for both underfloor heating and DHW , then we'd better have at least 1 coil in the tank ?
    if I understand it correctly , my question is : if there is already one heat exchanger integrated in the heat pump outdoor unit, why should we have one more coil in the water tank ? I dont get it ....
    I'd appreciate your explaination on this one .
    Cheers,
    leieli
    • CommentAuthorDavipon
    • CommentTimeJan 7th 2009
     
    The coil would be heated by free sunshine via panels or tubes,the heat is then passed to water in tank from the coil.This link may explain it.I have some stuff downloaded ages ago from Energy saving trust but dont know how to post it!! http://en.wikipedia.org/wiki/Solar_hot_water_system
    • CommentAuthorJackyR
    • CommentTimeJan 7th 2009
     
    Leilei, you're quite right, you don't need another heat exchanger to use your heat pump. What Davipon is suggesting is an additional heating system (solar) for your tank, in case the heat pump disappoints. Or at least a coil ready in place so you wouldn't have to change the tank to add solar.
    • CommentAuthorleilei
    • CommentTimeJan 8th 2009
     
    Hi Davipon & JackyR ,Thanks for the explaination, I see the point now :-)
    Cheers, leilei

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