Plate fin heat exchangers, because of their compactness, low weight and high effectiveness are widely used in aerospace and cryogenic applications. This device is made of a stack of corrug…Full description
Plate heat Exchanger
Heat Transfer CalculationFull description
Complete design of Plate Heat Exchanger made in excelDescripción completa
Complete design of Plate Heat Exchanger made in excel
Complete design of Plate Heat Exchanger made in excel
phe
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CLB21003 Process Heat Transfer Mini Project: Design of heat exchangerFull description
Improve Heat exchanger designFull description
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Design a shell and tube heat exchanger to be used in cooling kerosene using light crude oil. Assume the working pressure for kerosene to be 5 bars and light crude oil to be 6.5 bars. Also, assume f...
PROJECT ON DESIGN OF PLATE HEAT EXCHANGER
Submitted by AMBARISH PHATAK NINAD LATURKAR RAVI AWADE
Guided by Prof. G.G.Dongre
Introduction to heat exchangers Modes of heat transfer 1. Conduction 2 .Convection 3. Radiation
Introduction to heat exchangers
Classification based on 1. Transfer process a) Direct contact b) Indirect contact 2. Flow arrangement a) Parallel Flow b) Counter Flow c) Cross flow
Different types of plate heat exchangers 1.
Spiral type plate exchanger
3.
Plate-fin and tube type exchanger
5.
Brazed plate-fin type exchanger
7.
Plate-fin and tube type exchanger
Different types of plate heat exchangers
Brazed Plate-fin type
Plate-frame type
Plate-fin and tube type
Spiral plate type exchanger
PHE - main components Carrying bar Frame plate
Pressure plate
Tightening bolts
Plate pack
Frame Carrying bars
Suppo rt colum ns Guiding bars
Carryings bar in Aluminium or Painted carbon steel Support columns in Aluminium or
One man can open and close a large PHE using standard tools Serviceability Less downtime Safety Longer lifetime
smaller Round carrying bar
Support column Round guiding bar
Carryings bar, Support columns and Guiding bar in Aluminium No roller needed due to low weight
The Plate Pack
Plate sizes
Plate geometries
Plate - corrugation and channels We have two plate corrugations (L
These and H)form three different channels (L, M and H) L: Low theta
L + L = L channels
H: High theta
L + H = M channels
H + H = H channels
We choose between L, M and H channels
Plate - main components Suspension Inlet / outlet
Distribution area Gasket in gasket groove
Passing through Leak chamber
Main heat transfer area
Thin sheet design, cold formed in single step hydraulic pressing (up to 40000 tons)
Plate - materials
Relative Price
Standard materials and thicknesses
AISI 304 (stainless steel)
Usually 0.4 or 0.5 mm thickness
Cheapest possible solution
AISI 316 (stainless steel)
115%
Always 0.5 and 0.6 mm
Some with thicker plates (high-pressure applications)
254 SMO (high-alloy stainless steel)
100%
250%
Usually in 0.6 mm to allow stock-keeping
Titanium
300%
Always 0.5 and 0.6 mm
Some with thicker plates (high-pressure applications)
Some PHEs with 0.4 mm (low-pressure applications) 600%
Alloy C-276 (Nickel alloy)
Usually in 0.6 mm to allow stock-keeping
Gasket - advanced sealing system Homogeneous rubber gasket made in one piece Gasket material from certified suppliers Supporting and protecting gasket groove
“Roof-top” gasket profile
Two component ovencured epoxy glue ...or glue-free gasket that do not mix sealing and fastening function
Gasket material
The choice of rubber material depends on
Fluids - chemical attack or not
The combination of temperature and pressure
Rubber materials change properties due to
Time - the rubber relaxes
Temperature - the rubber deteriorates
Hardening by attack of oxidising agents (e.g., oxygen in air)
Swelling or softening by absorption of chemicals in the fluids
Only 2 plates that do not transfer heat - the endplates
Problem statement
Design a plate heat exchanger for 800 Kg/hr of deminaralized water that enters an exchanger at 50°C and leaves the exchanger at 40°C. The heat will be transferred to 800 Kg/hr of seawater coming from supply at 33°C and leaving the exchanger at 42.9°C. A 65 KPa pressure drop on demineralised water side and 67 KPa on seawater side may be expended. Actual area of the heat exchanger is given that 318/322 m² and the number of plate should not be increases more than that of 173/175. Also Given input data: a = 1.84 m² gap between the plates = b = 3.25*10-3 m Channel width = w = 0.9367 m Channel height = H = 2.192 m Connection diameter = 230 mm
Approach to solve the problem THERMAL
Using LMTD method calculate the avg. heat load“Q” and ∆Tm. Find the heat transfer coefficient at both the sides-primary and secondary. Knowing the overall heat transfer coefficient, calculate the total area needed by the formula: Q=K.A.∆Tm Calculate the number of plates needed as the area of each plate is known. Check the pressure drop on both sides are in the required limits.
Approach to solve the problem MECHANICAL •
TIGHTENING BOLTS: Material - SA 193-B7; Designed according to ASME CODE 8- table UCS-23
•
FRAME AND PRESSURE PLATE Material - SA 516-60; Designed according to Section U2 and referred table UCS-23 and UG-23(c). STUD BOLT Material – SA 193-B7
•
Testing procedure of phe
Equipments Test procedures Examination Acceptance standard Reports
Conclusion Plate heat exchanger has an advantages as : Movable pressure plates Versatility Lower liquid volume Expandable Durability Reliablity
