This document describes a double pipe heat exchanger, including its construction, working, types, applications, and advantages/disadvantages. It consists of concentric inner and outer pipes connected by tees and return bends/heads to form a hairpin configuration. Hot fluid flows inside the inner pipe while cold fluid flows in the annulus between the pipes, facilitating countercurrent heat transfer through the pipe walls. Common applications include evaporators, condensers, and chillers. The advantages are its small surface area, simple construction, and low cost, while the disadvantages are its small heat transfer, many potential leakage points, and longer processing time.

1. DOUBLE PIPE
HEAT EXCHANGER
• SUB : PROCESS HEATTRANSFER
• DEPT.: CHEMICAL
• SUB CODE :4340501
• DIVISION : CTO D
• SEM : 4TH

2. NAME & ENROLLMENT NO :
1. GEDIYA KARAN DIPAKBHAI En No. : 226208305008
2. GOHIL JIGNESH RAMSINHBHAI En No. :226208305009
3. HALA SHAKEELRAZA MAHAMMADBHAI En No. : 226208305010
4. JADAV RONAK UMESHBHAI En No. : 226208305011
5. KARENA DIVYESH KISHORBHAI En No. :226208305013

3. CONSTRUCTION :

4. CONSTRUCTION :
• It consists of concentric pipes,connecting tees,return heads and return bends.The
packing glands support the inner pipe within the outer pipe.A double pipe heat
exchanger arranged in two legs [i.e., when two lengths of the inner pipe are connected
by a return bend] as shown in Fig.is known as a single hair-pin.Tees are provided with
nozzles or screwed connections for permitting the entry and exit of the annulus fluid
which crosses from one leg to the other through the return head.The return bend
connects two legs of the inner pipes to each other.This exchanger can be very easily
assembled in any pipe-fitting shop as it consists of standard parts and it provides
inexpensive heat transfer surface.

5. WORKING :

6. WORKING :
• The hotter flow is traversing the inner tube,while the outer shell contains the cold flow
(note that this is not always the case).The double pipe heat exchanger works via
conduction,where the heat from one flow is transferred through the inner pipe wall,
which is made of a conductive material such as steel or aluminum.The double pipe heat
exchanger is often used in counterflow,where its fluids move in opposite directions (as
shown above).True counterflow is achieved in double pipe exchangers because of the
concentric tubes,and designers take advantage of this to increase the system’s heat
transfer coefficient.They can also be used in parallel flow where both fluids move in the
same direction,but counterflow is often the most thermally efficient regime.

7. TYPES OF DOUBLE PIPE HEAT EXCHANGER :

8. • APPLICATION:
1.The double pipe exchanger is used in the compressors and boiler because they have very
high pressure and
temperature.
2.Cooling and heating systems of the process plant.
3.Wastewater treatment
4.Refrigeration
5.Oil refining
• COMMON APPLICATION :
applications include: Evaporators,Condensers,Air-cooled condensers,Water-cooled
condensers, Chiller.

9. ADVANTAGES & DISADVANTAGES :
ADVANTAGES
• SURFACE REQUIREMENTS IS SMALL
ABOUT 9.25 METERSQUARETO 14
METERSQUARE.
• SIMPLE IN CONSTRUCTION.
• CHEAP & EASYTO CLEAN.
DISADVANTAGES
• SMALL HEATTRANSFER.
• MAXIMUM LEAKAGE POINTS.
• REQUIRES LARGETIMETO PROCESS.