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  1. #11

    Jun 2006
    T, , Greece.
    :
    2,965


    quote: , ?
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    ____________________
    ' ... !

  2. #12

  3. #13

    Jun 2008
    Glyfada, , Greece.
    :
    3,101
    quote:Originally posted by xristos69

    "" http://www.redwell.gr/
    :
    xristo69 ! .
    ' , . :
    ---' ' .
    --- . .
    --- .

    ' . ... . . ; WILO; ! .
    ...

    fan-coils. - 80%. ( ), : , ! . panels , . panels ; , ' .
    . . 0,5 m/sec. 1 m/sec . .
    , . !
    ( : by convection ' ), . ! , , , , . DIN EN ' !! ! !

    , Fundamentals ASHRAE : 8 Thermal Comfort. :

    [u]Asymmetric Thermal Radiation
    Asymmetric or nonuniform thermal radiation in a space may be
    caused by cold windows, uninsulated walls, cold products, cold or
    warm machinery, or improperly sized heating panels on the wall or
    ceiling. In residential buildings, offices, restaurants, etc., the most
    common causes are cold windows or improperly sized or installed
    ceiling heating panels. At industrial workplaces, the reasons include
    cold or warm products, cold or warm equipment, etc.
    Recommendations in ISO Standard 7730 and ASHRAE Standard
    55 are based primarily on studies reported by Fanger et al.
    (1980). These standards include guidelines regarding the radiant
    temperature asymmetry from an overhead warm surface (heated
    ceiling) and a vertical cold surface (cold window). Among the studies
    conducted on the influence of asymmetric thermal radiation are
    those by Fanger and Langkilde (1975), McIntyre (1974, 1976),
    McIntyre and Griffiths (1975), McNall and Biddison (1970), and
    Olesen et al. (1972). These studies all used seated subjects, who
    were always in thermal neutrality and exposed only to the discomfort
    resulting from excessive asymmetry.
    The subjects gave their reactions on their comfort sensation, and
    a relationship between the radiant temperature asymmetry and the
    number of subjects feeling dissatisfied was established (Figure 7).
    Radiant asymmetry, as defined in the section on Environmental
    Parameters, is the difference in radiant temperature of the environment
    on opposite sides of the person. More precisely, radiant asymmetry
    is the difference in radiant temperatures seen by a small flat
    element looking in opposite directions.





  4. #14
    Dimitris75's Avatar
    Oct 2008
    Pireas, , Greece.
    :
    . -
    322
    . . .

  5. #15
    quote:Originally posted by Dimitris75

    . . .
    ( ) topic . Akan 80% 20% ( panel)

    http://levitostasia.net

  6. #16

    Jun 2008
    Glyfada, , Greece.
    :
    3,101
    Dimi 75 on-line post. ' 30 posts!
    link site . .
    ' . . . ' . panel .
    ! ; 80% 20% ; ;
    .
    : . . & . . . ( ) . . .
    :
    4 5 ( ) . R. 5 20% . . . AKAN .


  7. #17
    Dimitris75's Avatar
    Oct 2008
    Pireas, , Greece.
    :
    . -
    322
    []. . ( , ) . ( ) . - []. , , . - / ( ).

  8. #18

    Jun 2008
    Glyfada, , Greece.
    :
    3,101
    ' ( ) ... !
    75, ... ! ' ' .
    Dimis convection/radiation, .
    . . : .
    75 :
    1. AKAN ; ;
    2. : : Lit. h / Mcal. . topic.
    3. : Dimis m ( ) ( ) . . ; , ; ; ; : 60 . convection 5,9 W/mK, 90 . : 5,7 W/mK 35 . : 6,8 W/mK. ( : Heat transfer by natural convection ASHRAE. h (W/mK) : Prandtl, Reynold, Nusselt, Grashof). 8 W/mK; ; ; - 80% ;
    . 25 . . ' ...!
    , : & . ( ) !
    Radiants...

    , topic . . ! ...


  9. #19
    Dimitris75's Avatar
    Oct 2008
    Pireas, , Greece.
    :
    . -
    322
    . .

  10. #20

    Oct 2005
    Nikea, , Greece.
    :
    2,979


    E! ...

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