There are three general categories of heat exchangers. Beyond double stream heat exchangers, designs involving triple or more streams are. A device whose purpose is the transfer of slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. We certify that the project entitled design of small heat exchanger double pipe type is written by mohamad shafiq bin alias. This research has been worked out to study the effect of washer inserts with various designs on heat transfer rate in double pipe heat exchanger. Heat exchangers jordan university of science and technology. Make an initial estimate of the overall heat transfer coefficient, u, based on. Outlet temperatures of hot, inner cold and outer fluid for experiment and cfd for. The goals for this project were achieved, as the team accomplished all objectives for the heat exchanger unit operation experiment. To understand the basic operation of heat exchangers. Design and analysis of a newly installed plate heat. Hot in hot out cold in cold out a parallel flow in cold out cold in b counter flow cold fluid hot fluid hot fluid cold fluid t t. Double pipe heat exchanger experiment qvndo5jowg4x idocpub. Counter flow heat exchangers are the most efficient of the three types.
In this experiment we are going to measure the effectiveness, ntu and the. Experimental investigation of doublepipe heat exchangers in air. Department of mechanical engineering university of baghdad abstract a set of the experiments were carried out to investigate the turbulent flow and heat transfer behavior in a double pipe counter water flow heat. Cfd analysis of triple concentric tube heat exchanger. The simplest heat exchanger is one for which the hot and cold fluids move in the same or opposite directions in a concentric tube or double pipe construction. Heat exchangers 73 individual thermal resistances of the system. Calculate the heat transfer area i 6 of the double pipe heat exchanger in the lab. A procedures manual was created for the doublepipe heat exchanger. Experimental investigation of double pipe heat exchanger by using semi circular disc baffles sarmad a. The simplest heat exchanger is one for which the hot and cold fluids move in the same or opposite directions in a concentric tube or doublepipe construction. The overall heat transfer characteristics of a double pipe.
This heat exchanger uses a spiraling inner copper tube, depicted in fig. The simplest heat exchanger is one for which the hot and cold fluids move in the same or. Double pipe heat exchanger standard operating procedure. Calculate the heat transfer area of the double pipe heat exchanger in the lab. Experimental investigation of heat transfer and friction factor characteristics in a double pipe heat exchanger with triangular fins was studied. Report 5 heat transfer coefficient for heat exchanger. Ya hussain 68 the overall heat transfer coefficient represents the ease with which heat is transferred from one medium to another. The working fluids were air, flowing in the annular pipe, and water through the inner circular tube.
The scheme of experimental apparatus for experiment work and the sensors which are set in equipment are shown in figure 3, determined as follows. To determine the overall heat transfer coefficient for the double pipe heat exchanger for countercurrent flow and parallel or cocurrent flow. Introduction a heat exchanger is the primary device used industrially for the transfer of heat between two fluids. Double pipe heat exchanger standard operating procedure 72016. Pdf experimental investigation of double pipe heat. In contrast to the parallel flow heat exchanger, the counter flow heat exchanger can have the hottest coldfluid temperature greater than the coldest hotfluid temperatue. What links here related changes upload file special pages permanent link.
In the present work the coating on the inner pipe of the double pipe heat exchanger is made by the different high thermal conductivity materials and tested for the. Concentric tube or pipe heat exchangers are used in a variety of industries for purposes. A heattransfer laboratory experiment with shellandtube. The nanofluids consist of al 2 o 3 and tio 2 nanoparticles, which were added to the base fluid deionized. Experimental investigation of double pipe heat exchanger. Tecquipments heat exchanger is in two equal parts joined by intermediate pipes. Heat exchangers heat exchangers are used to transfer heat between two sources. Double pipe heat exchangers, also known as double tube, double duct, or tubeintube heat exchangers, are considered one of the devices for passive heat transfer enhancement. This is fairly efficient at first but quickly runs out of steam pun intended. The overall heat transfer characteristics of a double pipe heat exchanger. Cfd analysis on heat and flow characteristics of double helically. Cox use safety glasses when operating this equipment wear leather gloves when working with the steam and condensate valves. In double pipe exchangers, one fluid flows inside a pipe, and the other fluid flows in the vicinity between the outer pipe and the inner pipe 22, 23, 24.
Convective heat transfer from the outer tube wall to the outside fluid. Overall heat transfer coefficient for doublepipe heat. Flow in a doublepipe heat exchanger can be cocurrent or countercurrent. In this experiment, the type of heat exchanger that was used is double pipe heat exchanger with counter flow arrangement. Pdf experimental study for double pipe heat exchanger with. The difference between parallel and counter flow behavior is identified using water as a working fluid. A double pipe heat exchanger and its heat transfer ability are analyzed in this experiment. Base your calculation on the outside area of the inside pipe. The heat exchanger layout depends on the heat transfer area hta so an initial estimate is required based on a trial value of the ohtc. 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 video is about our experiment for the double pipe heat exchanger. It gives the heat transfer coefficient in terms of the friction factor, the reynolds number and the prandtl number. This allows two extra measurement points at the midpoint plus the standard four points at the connectors. Heat exchanger demonstration lab double pipe he shell.
Pdf heat exchanger lab experiment chemical engineering. Ranjith 18 carried out an experiment to measure the heat transfer coefficients and pressure drop for twisted tapes inserts double pipe heat paper. The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. This gives more useful experiment results, to show more clearly how the fluid temperatures change during heat transfer. It is called a doublepipe exchanger because one fluid flows inside a pipe and the other fluid flows between that pipe and another pipe that surrounds the first. Comparison of experimental data with predictions of standard correlations article pdf available january 2001 with. Do not adjust the air regulators located by the i beam behind the computer. In a laboratory experiment, we will use a double pipe heat exchanger as shown below. Hot water is then pumped in the outer pipe of the heat exchanger. In heat exchanger, forced convection allows for the transfer of heat of one moving stream to another moving stream. The area density for double pipe heat exchanger can not be in the order of 700.
Doublepipe heat exchangers, also known as doubletube, doubleduct, or tubeintube heat exchangers, are considered one of the devices for passive heat transfer enhancement. Introduction heat exchangers are the equipment that is commonly used to transfer heat between two flowing fluids at different temperatures without any mixing of fluid with each other. In the inner pipe, cold water is pumped to obtain heated water at the exit. Heat exchange is an important unit operation that contributes to efficiency and safety of many processes. The heat exchange duty a llows calculation of the log mean. Av6 ball valves for pipe draining figure 3 schematic of the experimental unit 25. It provides hot and cold water to the heat exchangers and all the instruments needed to measure their performance. Experiment regarding heat exchanger concurrentcountercurrent flows at same rate and different rates. Chemcad is used to establish the steady state mass and energy balances across the heat exchanger and typical values of the ohtc are shown in the attachments. Engineering senior design project double pipe heat exchanger university of central oklahoma.
Pdf experimental investigation for the heat transfer of a double. Tm is the log mean temperature difference given as t t. Double pipe heat exchanger report free download as pdf file. Doublepipe heat exchangers are considered one of the practical solutions in todays. Gnielinski correlation for the heat transfer coefficient of the shell side and tube side fluids hh and hc. In doublepipe exchangers, one fluid flows inside a pipe, and the other fluid flows in the vicinity between the.
The main purpose of heat exchanger is to remove the heat from the hot fluid and transfer it. Concentric tube heat exchanger thermodynamics tecquipment. Heat exchangers are typically classified according to flow arrangement and type of construction. The doublepipe heat exchanger is one of the simplest types of heat exchangers. You can see that using linear flow, the most you can ever heat or cool to is the midpoint of the differential. R sekulib university of kentucky introduction a heat exchanger is a device that is used for transfer of thermal energy enthalpy between two or more fluids, between a solid surface and a fluid, or between solid particulates and a. Heat exchanger 1 lmtd method heat transfer log mean temperature difference lmtd method the rate of heat transfer is a heat exchanger can be expressed as q ua. The heat exchanger consists of two thin wall copper tubes mounted concentrically on a panel. Combining each of these resistances in series gives.
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. Heat exchanger service module thermodynamics tecquipment. Calculate the required heat transfer rate, q, in btuhr from specified information about fluid flow rates and temperatures. In the parallel flow ar rangement the hot and cold fluids enter at the same end, flow in the same direction, and leave at the same end. Therefore, it can not be classified as a compact heat exchanger. One part of this experiment involves measurements using the enhanced concentric tube heat exchanger in which the fluids flow in a countercurrent fashion. Calculating the film heat transfer coefficient for the inner tube side flow, using the dittusboelter 3, correlation. The popularity of spiral coil heat exchanger is coming from their wide applications due to usefulness and suitability as they prove to be compact in design, unique in. A laboratory experiment for demonstrating heat transfer in a shellandtube condenser has been described. To demonstrate the basic equations of heat exchanger operation.
Laminar counter and parallel flows in a double pipe heat exchanger is studied experimentally using two types of nanofluids as a cooling medium. Evaporator and condenser diw flowrates used in the experiment. Engineering senior design project double pipe heat. It is effective in helping undergraduate students in understanding the concepts and applications of heat transfer by convection and condensation. Double pipe, heat capacity, lmtd, triangular baffles heat exchanger, overall heat transfer coefficient, effectiveness etc. Inserts when placed in the path of the flow of liquid, create a high degree of turbulence resulting in an increase in the heat transfer rate and the pressure drop. Pdf the overall heat transfer characteristics of a. Double pipe heat exchanger report heat exchanger heat transfer. With convection, as heat is transferred through the pipe wall it is mixed into the stream and the flow of the stream. In this heat exchanger, we will heat water in a water heater similar to the one commonly used in domestic water heating. E1mnl032a design and rating of shell and tube heat. One common example of a heat exchanger is the radiator in a car, in which the heat source, being a hot enginecooling fluid, water, transfers heat to air flowing through the radiator i. Experimental investigation of doublepipe heat exchangers. Double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend.
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