Double Pipe Heat Exchanger

Rangrej S.P. (140954002)Joewin Joy (140954003)

Hitesh Muthiyan (140954007)

Programme Name: ATPES 2014-2016

Presented By:-

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• Introduction• Problem Statement• Steps of Coding• Result Comparison• References

Outline of Presentation…..

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DPHX…..

The double-pipe heat exchanger is one of the simplest types of heat exchangers. It is called a double-pipe exchanger because one fluid flows inside a pipe and the other fluid flows between that pipe and another pipe that surrounds the first. This is a concentric tube construction. Flow in a double-pipe heat exchanger can be co-current or counter-current.

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DPHX…..

• DPHX can be classified in two types:- 1)Counter flow 2)Parallel flow

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Design of Double Pipe Heat Exchanger to calculate Pumping power, Pressure drop, Overall heat transfer coefficient with given input parameters in MATLAB

Problem Statement…..

• 1.Counter flow 2. Parallel Flow• Tube side parameter entry• Choose the tube side fluid 1. Water 2. Ethylene glycol 3. Engine oil• Mass flow rate of fluid • Inlet fluid temperature• Exit fluid temperature• Type of pipe :- 1. Plain pipe 2. Outer fine• Inner diameter of the Tube• Outer diameter of the Tube• Inner diameter of the shell• Length of Tube• Fin height• Thickness of fin• No. of fins • No. of tubes• Thermal conductivity of the pipe & Fin material

Steps in which codes are written

• Mean Velocity• Reynolds Number• Heat Transfer rate• Nusselt Number• Tube & Shell side Heat transfer coefficient• Pressure Drop• Pumping Power

Various Results obtained…

• Tube Side = Water (Cold)• Shell Side = Oil (Hot)• di = 0.02092 m• do = 0.02667 m • Di = 0.0525 m • Tci = 20 °C & Thi = 65 °C • Tco = 30 °C & Tho = 55 °C • Nt= 1 • Nf = 30 • Hf = 0.12 m & δ = 0.0009 m • L = 4.5 m• Rfi = 0.0000827 m2k/W• Rfo = 0.0007051 m2k/W

• ɳp = 0.8

Designing DPHX with following input parameters

Sr. No Parameters Manual Calculations MATLAB solution

1. Tube side Heat transfer coefficient (W/m2k) 13659.79 13744

2. Shell side Heat transfer coefficient (W/m2k) 229.63 232.80

3. Overall heat transfer coefficient w.r.t outer surface (W/m2k)

103.657 97.03

4. No. of hair pins 3 3

5. Shell side pressure drop (KPa) 6815.02 7012.23

6. Tube side pressure drop (KPa) 218.417 218.33

7. Shell side pumping power (KW) 29.57 30.44

8. Tube side pumping power (W) 401.78 402.08

Comparative Analysis

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References

1. Getting Started With MATLAB :By Rudra Pratap2. Fundamentals of Heat Exchanger Design by by Ramesh

K. Shah

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