Double pipe heat exchanger modeling comsol uses in undergraduate education louis desgrosseilliers and dominic groulx mechanical engineering department, dalhousie university corresponding author. Doublepipe heat exchangers, with their typical uturn shape, are one of the simplest and cheapest type of heat exchangers used in the chemical process industry. The major considerations and assumptions made for sizing of triple concentric pipe heat exchanger are as follows. A double pipe heat exchanger consists of two concentric tubes connected by end closures. This excel spreadsheet helps you design a double pipe heat exchanger also known as a concentric tube heat exchanger.
Therefore the authors of this publication tried to combine these average data. Pdf the double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. For this type of heat exchanger, the outlet temperature for both hot and cold fluids that produced is estimated by using the best design of this type of heat exchanger. Which is more efficient, shell and tube heat exchangers or. Heat exchangers 73 individual thermal resistances of the system. The scheme of experimental apparatus for experiment work and the sensors which are set in equipment are shown in figure 3, determined as follows. 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. A food processing company is developing a new product with milk as a key ingredient. The double pipe heat exchanger is used in industry such as condenser for chemical process and cooling fluid process.
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. Heat transfer of a multiple helical coil heat exchanger using a microencapsulated phase change material slurry. The area density for double pipe heat exchanger can not be in the order of 700. It can be operated as a parallel flow or as a counterflow heat exchanger. Qualitative dependence of the fluid temperature on position inside a singlepass heat exchanger is shown in fig. A double pipe, countercurrent, singlephase heat exchanger with. The pressure of tube is around 150 bar and the pressure of annulus fluid is 10 bar and both in the liquid phase. Pdf the singlephase flow and thermal performance of a double pipe heat exchanger are examined by experimental methods. Thermal analysis of double pipe heat exchanger by changing. The influence of the mass flow of the shell side and the logarithmic mean temperature difference is studied. Repeat the experiment using counter flow setup on heat exchanger. The apparatus consists of a test section heat exchanger, two tanks, two magnetic gear pumps, and a pump for transporting nanofluid as the hot fluid and the other for the cold water. Pump water through inner pipe of doublepipe heat exchanger flow steam through outer pipe of doublepipe heat exchanger allow to come to steady stat e monitor.
Pdf experimental investigation of double pipe heat. Double pipe heat exchanger modeling comsol uses in. Optimum design of double pipe heat exchanger sciencedirect. 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. Double pipe heat exchanger this project work is based on design and thermal analysis of double pipe heat exchanger. The figure of the mesh of the double pipe heat exchanger with twisted tape is shown below. Pdf the overall heat transfer characteristics of a double. A double pipe heat exchanger fabrication and standardization. Common example the classic example of a heat exchanger is found in an internal combustion engine in which a circulating fluid known. The test section is a counter current double pipe heat exchanger with the length of 120 cm. To demonstrate the basic equations of heat exchanger operation.
Hemmat of mechanical engineering, shahid bahonar university of kernlan, iran abstract the single phase flow and thermal performance of a double pipe heat. To determine the overall heat transfer coefficient for the double pipe heat exchanger for countercurrent flow and parallel or cocurrent flow. Input and output temperatures of annulus and pipe are known. Double pipe heat exchangers come into their own when. Dec 21, 2014 the meanings of the four temperatures in the log mean temperature difference equation are rather self explanatory as shown in the diagram of a counterflow double pipe heat exchanger at the right.
What are practical applications of double pipe heat. Experiment and simulation on heat transfer efficiency of double pipe heat exchanger for river watersource heat pump. The experimental setup and apparatus required to carry out the double pipe heat exchanger experiment. Box 15000, halifax, nova scotia, canada, b3h 4r2, louis. The most widely used double pipe heat exchanger is the hair pin. Apr 26, 2016 this video is about double pipe heat exchanger.
Double pipe heat exchanger ce 328 spring 2003 objective. Jun 08, 2016 how to build a hinged hoophouse for a raised bed garden duration. The present study has focused on the use of coil heat exchangers ches with microencapsulated. Combining each of these resistances in series gives. In a laboratory experiment, we will use a double pipe heat exchanger as shown below. Double pipe heat exchanger experiment qvndo5jowg4x idocpub. The double pipe heat exchanger is probably one of the simplest configurations found. A procedures manual was created for the double pipe heat exchanger. Alhabeeb department of mechanical engineering, universiti teknologi petronas, malaysia abstract convection heat transfer can be enhanced by imposed turbulence in the annular flow of a double pipe heat exchanger.
Report 5 heat transfer coefficient for heat exchanger. Numerical analysis on a double pipe heat exchanger with. Double pipe heat exchanger design with counterflow or. Hot oil flows through the center tube in all six sections. The nanofluids consist of al 2 o 3 and tio 2 nanoparticles, which were added to the base fluid deionized. This example studies the cooling of hot oil c by a cool oil 60c entering in countercurrent. Experiments werecarried out at sub critical reynolds number of 2100. Although the necessary equations for heat transfer and the pressure drop in a double pipe heat exchanger are available, using these equations the optimization of the system cost is laborious. Teaching experiment of different types of heat exchangers aradiator type. In the inner pipe, cold water is pumped to obtain heated water at the exit.
Heat exchangers heat exchangers are used to transfer heat between two sources. Comparison of experimental results with valid theoretical data based on semiempirical equations shows an acceptable agreement. Experimental analysis on heat transfer enhancement of double. Present study with the use of alumina al2o3water nanofluid and baffled twisted tape inserts in double pipe heat exchanger as compound augmentation technique. Chapter 5 heat exchangers faculty of engineering and. The overall heat transfer characteristics of a double pipe. Two cold water streams cooling medium flow through central pipe and outer annular space in same direction. Experiment regarding heat exchanger concurrentcountercurrent flows at same rate and different rates. In this configuration, no mixing of the hot and cold fluids needs to take place. The high stresses produced by differential thermal expansion between outer and inner pipes are more easily handled. Calculate the heat transfer area i 6 of the double pipe heat exchanger in the lab. To determine the water side overall heat transfer coefficient on a crossflow heat exchanger. Pdf basic design methods of heat exchanger researchgate.
Double tube heat exchangers are designed whereby one tube is concentrically positioned within a larger tube. Heat exchangers are used in industrial processes to recover heat between two process fluids. The theories of transient heat transfer in double pipe heat exchangers were explained and followed by literature correlations. The heat transfer rate, q, for thermal design of a double pipe heat exchanger.
The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. The experimental results demonstrate that the heat transfer coefficient of the exchanger increase with increasing of the logarithmic mean. One fluid flows in the inner tube, while the other fluid flows in the annular space between the two tubes. In parallel flow, both the hot and cold fluids enter the heat exchanger at the same end and move in the same direction, as shown in figure 1. Experimental investigation on heat transfer coefficient for. Group 1 the lab heat exchanger set equipment under parallel flow conditions according to the front panel of heat exchanger, and once conditions have stabilized, take the temperature readings for the inlet and outlet thermometers of both the cold and hot fluid. 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 first three sections, saturated steam is supplied to the outer tubes in order to heat the oil. 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. To understand the basic operation of heat exchangers. Experimental investigation on heat transfer coefficient. Types of heat exchangers the simplest type of heat exchanger consists of two concentric pipes of different diameters, as shown in figure 1, called the doublepipe heat exchanger. Effects of temperature and concentration of nanoparticles on nusselt number changes and heat transfer coefficient in a double pipe heat exchanger with counter turbulent flow are investigated.
Download as docx, pdf, txt or read online from scribd. This project work is based on design and thermal analysis of double pipe heat exchanger. Double pipe, heat capacity, lmtd, triangular baffles heat exchanger, overall heat transfer coefficient, effectiveness etc. In commercial aircraft heat exchangers are used to take heat from the engines oil system to heat cold fuel.
Single inner pipe formed into a removable u or element, with either. A shell and tube heat exchanger is more efficient as it can have multiple passes for the fluid to stay longer in contact with heating material fluid in this case. The heat exchange duty a llows calculation of the log mean. Plate heat exchanger, how it works working principle hvac industrial engineering phx heat transfer duration. Students will determine the heat transfer coefficient which is the measure of. 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. The goals for this project were achieved, as the team accomplished all objectives for the heat exchanger unit operation experiment. They have a particular advantage when close temperature approaches are needed or in high pressure applications.
Flow in a doublepipe heat exchanger can be cocurrent or countercurrent. Common types of heat exchangers used in this application are the double pipe heat exchanger as well as the plate and frame heat exchanger. Hot water is then pumped in the outer pipe of the heat exchanger. The double pipe heat exchanger consists of six lengths of concentric tubing set out as shown in figure 1. Experimental analysis on heat transfer enhancement of. A double pipe heat exchanger consists of one pipe inside another. Double pipe exchangers is the generic term covering a range of jacketed u tube exchangers normally operating in countercurrent flow of two types. They have summarized some of the exsting laminar flow heat transfer correlations in circular. Heat exchangers are devices used to transfer heat between two or more fluid streams. Three types of fluid motion direction inside the heat exchanger are parallel flow, counter flow and cross flow. A device whose purpose is the transfer of thermal energy between two fluids.
The temperature needs to be accurately regulated to provide the downstream unit operations with milk at the expected temperature and consistency. Overall heat transfer coefficient for doublepipe heat. As a part of the process, milk is heated by water in a countercurrent double pipe heat exchanger. Doublepipe exchangers is the generic term covering a range of jacketed u tube exchangers normally operating in countercurrent flow of two types. Although the performance and analysis of double pipe heat exchangers have been established long time ago. 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. The gardening channel with james prigioni recommended for you. Heat exchanger demonstration lab double pipe he shell. One fluid in a doublepipe heat exchanger flows through the smaller pipe while the other fluid flows through the annular space between the two pipes.
In both heat exchangers, the hot water flows inside the inner tube and the cold water flows in the annulus. Kiran kumar, numerical and experimental investigation of heat transfer augmentation in double pipe heat exchanger with helical and twisted tape inserts, international journal of emerging technology and advanced engineering, volume 4, issue 9, 2014, pp. The double pipe heat exchanger uses pressurized steam in an outer tube to heat water pumped through an inner tube. Heat transfer of nanofluid in a double pipe heat exchanger. Tech 1 pg scholar, department of thermal, mlr institute of technology, ranga reddy, telangana, india. Reason for heat exchangers a heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another hot and cold fluid. 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 modeling comsol uses in undergraduate education louis desgrosseilliers and dominic groulx. In this heat exchanger, we will heat water in a water heater similar to the one commonly used in domestic water heating. For the purpose of the experiments, a 19 mm diameter coppertubes.
Pdf heat exchanger lab experiment chemical engineering. An enhanced concentric tube heat exchanger and a shell and tube heat exchanger will be analyzed using the log mean temperature difference lmtd method and the effectivenessntu. Spiral coil heat exchanger experimental study esam jassim prince mohammed bin fahd university pmu. Therefore, it can not be classified as a compact heat exchanger. Double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend.
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. Heat transfer augmentation techniques ultimately results in the reduction of thermal resistance in a conventional heat exchanger by generating higher convective heat transfer coefficient. The overall heat transfer characteristics of a double pipe heat exchanger. Double pipe heat exchangers free download as word doc. 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 doublepipe heat exchanger is one of the simplest types of heat exchangers. A procedures manual was created for the doublepipe heat exchanger. Counter flow heat exchanger counter flow is preferred, as the difference in temperature between the hot and cold fluids is relatively constant along the full length of the heat exchanger. Nov 22, 2012 design of double pipe heat exchanger posted in chemical process simulation. Experimental investigation of doublepipe heat exchangers in air conditioning applications.
Laminar counter and parallel flows in a double pipe heat exchanger is studied experimentally using two types of nanofluids as a cooling medium. A concentric tube or double pipe heat exchanger is one that is composed of two circular tubes. The heat recovery from hot fluid is used to increase the temperature of cold fluid. Pdf experimental investigation of double pipe heat exchanger using al2o3 and tio2 nanofluid prof. However, in this experiment the focus is only on parallel flow and counter flow inside the concentric pipe.
Heat transferheat exchangers blogs engineering excel templates. Manifolding of a multiple hairpin setup is easily accommodated. The theories of transient heat transfer in doublepipe heat exchangers were explained and. Hot water flows through the inner annular space in opposite direction to that of the cold water streams. Design and analysis of a newly installed plate heat.1448 1266 802 1084 32 1106 1328 1186 777 1143 1531 1485 1410 836 136 1534 1535 1492 1416 1554 304 1135 877 862 518 846 1108 990 918 1288