Double pipe heat exchanger experiment free download as pdf file. Plot the ratio of hxlaminar to hxturbulent against rex in the. I tried with the shell and tube hx but this is not what i have to simulate. Double pipe heat exchanger ce 328 spring 2003 objective. Base your calculation on the outside area of the inside pipe. Heat exchangers are used to transfer heat between two sources. The nanofluids consist of al 2 o 3 and tio 2 nanoparticles, which were added to the base fluid deionized. For example, in a shell and tube exchanger, the pipe diameter and. The overall heat transfer characteristics of a double pipe heat exchanger. In the inner pipe, cold water is pumped to obtain heated water at the exit. In a parallel flow heat exchanger, the two fluid streams hot and cold flow through the heat. The overall heat transfer characteristics of a double pipe. Students explain how to carry on the double pipe heat exchanger experiment in thermal fluid systems lab.
I would appreciate if you could introduce some sources to me. Each of those parameters will be discussed briefly in the next three sections. Report 5 heat transfer coefficient for heat exchanger. The default working environment for geometry is 3d. Temperature efficiency is an actual indicator of the actual heat transfer taking place in the heat exchanger as a percentage of the maximum possible heat transfer that would take place if infinite surface area were available. To demonstrate the basic equations of heat exchanger operation. A device whose purpose is the transfer of thermal energy between two fluids. Experimental investigation on heat transfer coefficient. In a laboratory experiment, we will use a double pipe heat exchanger as shown below. Tm is the log mean temperature difference given as t t. Ranjith 18 carried out an experiment to measure the heat transfer coefficients and pressure drop for twisted tapes inserts double pipe heat paper. Hi, i need to simulate a double pipe hx with hysys. Double pipe, heat capacity, lmtd, triangular baffles heat exchanger, overall heat transfer coefficient, effectiveness etc.
The equipment used was a countercurrent heat exchanger. Experimental investigation of doublepipe heat exchangers. Design a double pipe heat exchanger with bare inner multitubes that can be used to cool engine oil with cold sea water. Abstract in this experiment, the group was able to compute for the overall heat transfer coefficient in a heat exchanger. Doublepipe heat exchanger doublepipe heat exchanger loading. In this experiment, the type of heat exchanger that was used is double pipe heat exchanger with counter flow arrangement. The effects various parameters are also investigated. One fluid flows in the inner tube, while the other fluid flows in the annular space between the two tubes. Heat exchangers jordan university of science and technology. The amount of heat transfer per section is small, that makes the double pipe heat exchangers a suitable heat transfer device in applications where a large heat transfer surface is not required. 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. Doublepipe heat exchangers are used in many industries because of their low design and maintenance costs, flexibility, and low installation costs 25. The result showed that the in counter flow arrangement inner side heat. The main objective of the present study is to investigate the enhancement of heat transfer by varying the pitch of the rectangular fins in the annulus side of the double pipe heat exchanger.
The method of computation was by using logarithmic temperature. They are mainly used for sensible heating or cooling of process fluids in applications of small heat transfer areas of up to 50 m 2 38. A procedures manual was created for the double pipe heat exchanger. 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. The double pipe heat exchanger is a small, modular design that is most useful in applications where conventional shell and tube exchangers are too large or too expensive to use. The double pipe heat exchanger consists of six lengths of concentric tubing set out as. Specific heat capacity of air at constant pressure. A procedures manual was created for the doublepipe heat exchanger.
In its classical sense, the term double pipe refers to a heat exchanger consisting of a pipe within a pipe, usually of a straightleg. 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. I was wondering if other complete sources are available about double pipe heat exchanger. The energy loss was occurred by hot fluid and energy gain by cold water and the experiment. To understand the basic operation of heat exchangers. Che524 double pipe heat exchanger lab manual engineering. Heat exchanger demonstration lab double pipe he shell. 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. E1mnl032a design and rating of shell and tube heat. 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.
Double pipe heat exchanger chemical process simulation. Calculate the heat transfer area i 6 of the double pipe heat exchanger in the lab. Evaporator and condenser diw flowrates used in the experiment. This excel spreadsheet helps you design a double pipe heat exchanger also known as a concentric tube heat exchanger. Pdf experimental study for double pipe heat exchanger with. In this experiment we are going to measure the effectiveness, ntu and the. Double pipe heat exchanger report free download as pdf file. The theories of transient heat transfer in double pipe heat exchangers were explained and followed by literature correlations. Experimental investigation of heat transfer and friction factor characteristics in a double pipe heat exchanger with triangular fins was studied.
Hemmat of mechanical engineering, shahid bahonar university of kernlan, iran abstract the single phase flow and thermal performance of a double pipe heat. A heat exchanger is a device that is used to transfer thermal energy enthalpy between two or more fluids, between a solid surface and a fluid. Calculate the heat transfer area of the double pipe heat exchanger in the lab. The method of solving the problem using logarithmic mean temperature difference is typical and more iteration must be done. In a double pipe heat exchanger, either the hot or cold fluid occupies the annular space and the other fluid moves through the inner pipe. Conventionally, spiral piping heat coupling mechanism is attributed to many factors such as geometrical configurations, compact size, bigger thermal conduction space, number of loops, etc. To study and evaluate the effects of flow conditions and flow configurations on the rate of heat transfer through thin walled tubes. Double pipe heat exchanger posted in chemical process simulation. All about double pipe heat exchangers what you need to know. Pdf heat exchanger lab experiment chemical engineering.
Experimental investigation of heat transfer enhancement of. Fire the boiler as per instructions in the boiler manual. In parallel flow, both the hot and cold fluids enter the heat exchanger at the same end and. Double pipe shellandtube spiral tube pipe coils crossflow to tubes parallel flow to tubes.
Introduction a heat exchanger is a device that is used to transfer thermal energy enthalpy between two or more fluids, between. The main purpose of heat exchanger is to remove the heat from the hot fluid and transfer it into the cold fluid. 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. Pdf experimental investigation of double pipe heat. Double pipe heat exchangers come into their own when. I have studied books like process heat transfer by d. Enter double pipe workbench in file name as a name of your workbench and click on save button. Heat exchangers 73 individual thermal resistances of the system. Double pipe heat exchanger experiment heat heat transfer. Doublepipe heat exchanger 3d cad model library grabcad.
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. Doublepipe abstract in this experiment the group was. Pdf the overall heat transfer characteristics of a. Since all heat exchangers considered in this experiment have a single pass for both the hot and cold fluids, the discussion below is limited to singlepass heat exchangers. Qualitative dependence of the fluid temperature on position inside a singlepass heat exchanger is shown in fig. The working fluids were air, flowing in the annular pipe, and water through the inner circular tube. Laminar counter and parallel flows in a double pipe heat exchanger is studied experimentally using two types of nanofluids as a cooling medium. Double pipe exchangers can be paired in series or in parallel to increase the heat transfer rate through a system without complication. To determine the overall heat transfer coefficient for the double pipe heat exchanger for countercurrent flow and parallel or cocurrent flow. Fired heaters the selection of a heat exchanger depends on many factors including capital and.
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. Hot water is then pumped in the outer pipe of the heat exchanger. However, in this experiment the focus is only on parallel flow and counter flow inside the concentric pipe. Ntu relationships are given for a simple double pipe heat exchanger.
Double pipe heat exchangers often also referred to as double pipes are characterized by a construction form which imparts a ushaped appearance to the heat exchanger. The influence of the mass flow of the shell side and the logarithmic mean temperature difference is studied. 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. In the first three sections, saturated steam is supplied to the outer tubes in order to heat the oil. Compare the working principles of a concentric tube heat exchanger operating under paral. A concentric tube or double pipe heat exchanger is one that is composed of two circular tubes. Example of data gathered are th1 115 0 c, th2 65 0 c, tc1 26 0 c, tc2 33 0 c. Counter flow heat exchangers are the most efficient of the three types. Experimental investigation of doublepipe heat exchangers in air. Doublepipe heat exchangers are considered one of the practical solutions in todays. Two types of flow arrangement are possible in a double pipe heat exchanger. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned. Pdf the double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern.
Fluid engine oil sea water inlet temperature, c 65 20 outlet temperature, c 55 25 heat load, kw 117. 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 double pipe heat exchanger consists of six lengths of concentric tubing set out as shown in figure 1. Experimental and analytical comparison of heat transfer in double pipe heat exchanger 5 the mass flow rate of hot water was 23. In this heat exchanger, we will heat water in a water heater similar to the one commonly used in domestic water heating. The experimental results demonstrate that the heat transfer coefficient of the exchanger increase with increasing of the. Hot oil flows through the center tube in all six sections. Overall heat transfer coefficient for doublepipe heat. An experimental setup is designed and constructed to study the heat transfer coefficient of the double pipe heat exchangers in this paper. Solar tubes heat pipe exchanger rich allen duration. 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. I am asked to give a lecture on double pipe heat exchanger. Double pipe heat exchanger report heat exchanger heat transfer.
Is it possible to select a tema configuration in order to make a paralelism. Combining each of these resistances in series gives. 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. Double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend. They have a particular advantage when close temperature approaches are needed or in high pressure applications.
Experiment regarding heat exchanger concurrentcountercurrent flows at same rate and different rates. In an excel spreadsheet for thermal design of a double pipe heat exchanger, the heat exchanger equation can be used to calculate the required heat exchanger area for known or estimated values of the other three parameters, q, u, and. What are practical applications of double pipe heat. The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. Double pipe heat exchanger posted in process heat transfer. 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.
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