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    Exchanger Thermal Design Equations

    Uploaded by

    thiruvilan
    This document discusses equations for calculating heat transfer and cooling loads in air coolers, chilled-water cooling coils, and cooling towers. It provides equations for determining the heat transfer coefficient, heat transfer rate, number of transfer units, effectiveness, and outlet temperatures in each component using variables like thermal conductivity, surface areas, mass flow rates, heat capacities, and inlet/outlet temperatures.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd

    Exchanger Thermal Design Equations

    Uploaded by

    thiruvilan
    27 views1 page
    This document discusses equations for calculating heat transfer and cooling loads in air coolers, chilled-water cooling coils, and cooling towers. It provides equations for determining the heat transfer coefficient, heat transfer rate, number of transfer units, effectiveness, and outlet temperatures in each component using variables like thermal conductivity, surface areas, mass flow rates, heat capacities, and inlet/outlet temperatures.

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    Original Title

    Exchanger_Thermal_Design_Equations

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    This document discusses equations for calculating heat transfer and cooling loads in air coolers, chilled-water cooling coils, and cooling towers. It provides equations for determining the heat transfer coefficient, heat transfer rate, number of transfer units, effectiveness, and outlet temperatures in each component using variables like thermal conductivity, surface areas, mass flow rates, heat capacities, and inlet/outlet temperatures.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    27 views1 page

    Exchanger Thermal Design Equations

    Uploaded by

    thiruvilan
    This document discusses equations for calculating heat transfer and cooling loads in air coolers, chilled-water cooling coils, and cooling towers. It provides equations for determining the heat transfer coefficient, heat transfer rate, number of transfer units, effectiveness, and outlet temperatures in each component using variables like thermal conductivity, surface areas, mass flow rates, heat capacities, and inlet/outlet temperatures.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 1

    Exchangers Thermal Design Equations

    Air Cooler
    k sf sf U md U Face
    ho 0.134 ( ) Pr 0.33 Re 0m.681 ( ) 0.2 ( ) 0.1134 Re , Um
    d f tf
    k Nt
    hi 0.0225 ( ) Pr 0.445 Re 0.795 exp[ 0.0225( n Pr) 2 ] , mt d i2V , N t Nr Nc
    d N pl 4
    1
    Uo
    1 Ao
    rf
    f ho Ai hi

    Q C min (Th, max Tc , min )

    1 UAo C min
    1 exp{ [1 exp( C r NTU )]} , NTU , Cr
    Cr C min C max
    ________________________________________________________________________
    Chilled-water Cooling Coils

    ha hs Cphi Ai
    R , R ( )
    ts tw ho Ao

    hs 10.73 1.4t s 0.046t s2 for ts tdew point


    hs ha Cp (t s ta ) for ts tdew point

    b b2 4ac
    ts , [a=0.046 , b=1.4+R , c= ha +R tw-10.73] for ts tdew point
    2a

    ho ha hai hsi hsi 1


    Qi m w Cp w Tw m a ha Ao, i ( i 1
    )
    Cp 2 2

    t a ,i t a ,i 1 t s ,i t s ,i 1
    Qsi ma Cp (t a,i t a ,i 1 ) ho Ao ,i (
    )
    2 2
    ___________________________________________________________________________
    Cooling Tower

    Tw ,in
    KaV dTw
    Cp w
    mw Tw , out
    (hs ha )
    Q mw Cp w (Tw ,in Tw ,out ) m a (ha ,out ha ,in )

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