Double Pipe Heat Exchanger Design Calculation Pdf

Background a heat exchanger is a heat transfer device whose purpose is the transfer of energy from one moving fluid stream to another moving fluid stream.

Double pipe heat exchanger design calculation pdf. The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. Flow in a double pipe heat exchanger can be co current or. 5 3 heat exchanger design methods the goal of heat exchanger design is to relate the inlet and outlet temperatures the overall heat transfer coefficient and the geometry of the heat exchanger to the rate of heat transfer between the two fluids. 13 with being the overall heat transfer coefficient the heat transfer area and is the log mean temperature difference.

Double pipe heat exchangers often also referred to as double pipes are characterized by a construction form which imparts a u shaped appearance to the heat exchanger. Equation 13 13 is used when simple counter or co current flows exist. 1 conduction where q is the amount of heat btu transferred in time t h k is the thermal conductivity btu h ft2 of ft a is the area of heat transfer normal to heat flow ft2 t is the temperature of x is the thickness of the conduction path ft. Heat transfer mechanisms of heat transfer.

This is a concentric tube construction. 2 convection h is the heat transfer coefficient btu h ft2of. 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. Overall heat transfer coefficient for double pipe heat exchanger calibrate thermocouples pump water through inner pipe of double pipe heat exchanger rate determined by rotameter flow steam through outer pipe of double pipe heat exchanger measure rate by pail and scale.

It can be operated as a parallel flow or as a counterflow heat exchanger. Double pipe heat exchanger design requires use of the heat transfer rate the log mean temperature difference and an estimate of the overall heat transfer coefficient to calculate the estimated heat transfer surface area. In addition the overall heat transfer equation for the exchanger must be solved simultaneously. To demonstrate the basic equations of heat exchanger operation.

To understand the basic operation of heat exchangers. Of the process calculation of. Double pipe heat exchanger. The heat exchange duty a llows calculation of the log mean.

This project work is based on design and thermal analysis of double pipe heat exchanger. It is the most. The double pipe heat exchanger is one of the simplest types of heat exchangers. The two most common heat exchanger design problems are those of rating and sizing.

By selecting an existing design of a double pipe heat exchanger with specified flow conditions at the inlet to the heat exchanger.