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

In this article explained about basic calculation 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

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 heat exchanger mainly done heat 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 very impotent 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 calculate heat transfer coefficient please go through the below link

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 estimate vapour flow rate requirement to achieve 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

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### Example for Plate Type Heat Exchanger Heat Transfer Area 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
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## 3 thoughts on “Plate Type Heat Exchanger Design Calculation | Plate and Frame Heat Exchanger”

#### Ajay Singh

(March 16, 2019 - 8:47 am)

How can calculate the juice velocity in PTHE

#### Girish A Neelagar

(August 1, 2019 - 1:39 pm)

I liked phe arrival thank-you sir

#### siva alluri

(August 1, 2019 - 4:56 pm)

welcome Mr.Girish A Neelagar