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You are at:Home»Calculations»Plate Type Heat Exchanger Design Calculation | Plate and Frame Heat Exchanger

Plate Type Heat Exchanger Design Calculation | Plate and Frame Heat Exchanger

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This article explained basic calculations for Plate Type Heat exchange design like hot fluid and cold fluid temperatures, heat transfer coefficient, heat transfer area calculation .. etc

Plate Heat Exchanger Heat Transfer Area Calculation | PHE Design Calculation

Basic concepts of Plate Type Heat Exchanger : (Please go through the below link)

Plate Heat Exchanger theory, structure and functional description, working and its application in Sugar Industry Process

Reading Map - Quick Links

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  • Fundamental criteria for Plate and Frame Heat Exchanger design calculation
    • Hot fluid parameters
    • Cold fluid parameters
    • Geometrical data
  • Example for finding cold fluid outlet temperature
  • Example for estimating vapour flow rate requirement to achieve the required outlet temperature of the cold fluid.
  • Online Steam Table for Saturated Steam
  • Example for Plate Type Heat Exchanger Heating Surface Calculation

Fundamental criteria for Plate and Frame Heat Exchanger design calculation

In the design of PHE mainly required two types of parameters –  

    • a) Process parameter  
    • b) Geometrical data

Process parameters: In a heat exchanger mainly done heat is exchanged from hot fluid to cold fluid

Hot fluid parameters

    • Flow rate
    • Inlet temperature
    • Outlet temperature
    • Density
    • Thermal conductivity
    • Specific heat
    • Fouling factor

Cold fluid parameters

    • Flow rate
    • Inlet temperature
    • Outlet temperature
    • Density
    • Thermal conductivity
    • Specific heat
    • Fouling factor

Geometrical data

    • Length of plate
    • Width of plate
    • Corrugation angle
    • Plate thickness
    • Plate enhancement factor
    • Amplitude of corrugation
    • Flow configuration

The Overall heat transfer coefficient (OHTC) is a significate factor in the design of plate type heat exchange design
OHTC units – Kcal / hr/m2/ °C or Kw/m2/ °C,

It is mainly depends upon the following parameters

    • a) Cold fluid film resistance
    • b) Hot fluid film resistance
    • c) Plate resistance – According to MOC (material of construction) of the plate
    • d) Resistance of scale. ( fouling factor)
    • e) Velocity of hot and cold fluid inside the heaters

For more information to calculating heat transfer coefficient please go through the link below.

  • Heat Transfer Coefficient of Liquid -Liquid Tubular Heater Calculation
  • Fundamental Concepts of Overall Heat Transfer Coefficient

Example for finding cold fluid outlet temperature

 S.No  Description  Formula  UOM  Values
 A  Hot Side (Hot water)
 1  Mass flow rate  Qh  Kg/hr  120000
 2  Specific Heat  Cw  kcal/kg/°C  1
 3  Inlet temperature  Ti  °C  75
 4  Outlet temperature  To  °C  50
 5  Heat Exchanged  H = Qh x Cw x (Ti – To)  Kcal/hr  3000000
 B  Cold Side (Cane Juice)
 1  Mass flow rate  Qc  Kg/hr  160000
 2  Specific Heat  Cp  kcal/kg/°C  0.93
 3  Inlet temperature  ti  °C  35
 4  Outlet temperature  to = ti + [H /(Qc x Cp)]  °C  55

Example for estimating vapour flow rate requirement to achieve the required outlet temperature of the cold fluid.

 S.No  Description  Formula  UOM Values
 A  Cold Side (Cane Juice)
 1  Mass flow rate  Qc  Kg/hr  270000
 2  Specific Heat  Cp  kcal/kg/°C  0.95
 3  Inlet temperature  ti  °C  95
 4  Outlet temperature required   to
 °C  110
 5
 Heat Exchanged  H = Qh x Cw x (to – ti)  kcal/hr  3847500
 B  Hot Side (Saturated  Vapour)
 1  Temperature of vapour  Tv  °C  112
 2  Latent Heat of vapour  λ (As per steam table)  kcal/kg/°C  531
 3  Vapour flow rate  Qh = H / λ  (Not considered sensible heat of condensate)  Kg/hr  7243

Online Steam Table for Saturated Steam

Click Here

Example for Plate Type Heat Exchanger Heating Surface Calculation

S.No  Description  Formula  UOM  Values
 A  Hot Side (Hot water)
 1  Mass flow rate  Qh  Kg/hr  120000
 2  Specific Heat  Cw  kcal/kg/°C  1
 3  Inlet temperature  Ti  °C  75
 4  Outlet temperature  To  °C  55
 5  Heat Exchanged  Qh x Cw x (Ti – To)  kcal/hr  2400000
 B  Cold Side (Cane Juice)
 1  Mass flow rate  Qc  Kg/hr  160000
 2  Specific Heat  Cp  kcal/kg/°C  0.93
 3  Inlet temperature  ti  °C  35
 4  Outlet temperature  to  °C  51
 5  Heat Exchanged  Qc x Cp x (to – ti)  Kcal/hr  2400000
 C  Logarithmic Mean Temperature Difference  ∆T m (LMTD)
 1  ∆T  to – ti  °C  16.1
 2  ∆Ti  ti-To  °C  23.9
 3  ∆To  to – Ti  °C  20.0
 4  ∆T m  ∆Ti – ∆To / [Ln(∆Ti / ∆To)]  21.9
 D  Heat transfer Coefficient  Kcal/hr/m2/oC  1800
 E  Heating surface  Qh x Cp x ∆T = K x  S x ∆Tm  m2  60.9
plate type heat exchanger design calculation | plate and frame heat exchanger area calculation | sugarprocesstech
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