Plate Type Heat Exchanger Design | Plate and Frame Heat Exchanger

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

Contents

1 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

Online Steam Table for Saturated Steam

Click Here

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

plate type heat exchanger design calculation | plate and frame heat exchanger area calculation | sugarprocesstech

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