Vasudev karanth, krishna murthy dept of mechanical engg, mit, manipal, india received september 20 20, accepted october 2014 abstract. The second type is regenerative type, in which hot and cold fluids are in the same space which contain a matrix of materials which work alternately as source for heat flow. Plate heat exchanger, how it works working principle hvac industrial engineering phx heat transfer duration. The double pipe heat exchanger uses pressurized steam in an outer tube to heat water pumped through an inner tube. Pdf the singlephase flow and thermal performance of a double pipe heat exchanger are examined by experimental methods. To study and evaluate the effects of flow conditions and flow configurations on the rate of heat transfer through thin walled tubes. The effect of nanoparticles on thermal efficiency of. Cfd analysis on performance of double pipe two pass heat exchanger m. The effects of temperature and concentration of nanoparticles on ht variation as well as overall heat transfer coefficient ohtc in a countercurrent double tube heat exchanger with turbulent flow have been studied. The doublepipe heat exchanger is one of the simplest types of heat exchangers. Double pipe heat exchanger simulation with chemcad youtube. 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. The experimental results show a remarkable 8%10% rise in the mean ht and the ohtc. Tech 1 pg scholar, department of thermal, mlr institute of technology, ranga reddy, telangana, india.
Pdf heat exchanger lab experiment chemical engineering. These styles of double pipe may have a bundle of inner tubes rather than a single tube and the limits on these styles are the number of tubes less than 30. Double tube heat exchangers are designed whereby one tube is concentrically positioned within a larger tube. Double pipe heat exchanger is perhaps the simplest of all heat exchanger types. As the name suggests, it consists of two pipes, one within the other. In its simplest form, the double pipe heat exchanger, also known as a concentric pipe, hairpin, jacked pipe and jacketed utube heat exchangers, consists of a single tube mounted inside another. The material used for the inner tube is copper because it has very high thermal conductivity. An experimental setup is designed and constructed to study the heat transfer coefficient of the double pipe heat exchangers in this paper.
Double pipe heat exchanger calculation does the thermal and hydraulic design of double pipe heat exchangers and estimate number of hairpin required. The double pipe heat exchanger consists of six lengths of concentric tubing set out as shown in figure 1. 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 nanofluids consist of al 2 o 3 and tio 2 nanoparticles, which were added to the base fluid deionized. 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. Cfd analysis on performance of double pipe two pass heat. The overall heat transfer characteristics of a double pipe. The major considerations and assumptions made for sizing of triple concentric pipe heat exchanger are as follows. Experimental analysis on heat transfer enhancement of. The test is conducted for only the counterflow configuration. Qualitative dependence of the fluid temperature on position inside a singlepass heat exchanger is shown in fig.
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. Tech student 2assistantprofessor 1,2talla padmavathi college of engineering, warangal, telangana abstract heat exchangers with the convective heat transfer of fluid inside the tubes are frequently used in many engineering applications. 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. Just like goldilocks, make your designs just right. A device whose purpose is the transfer of thermal energy between two fluids. To determine the overall heat transfer coefficient for the double pipe heat exchanger for countercurrent flow and parallel or cocurrent flow. 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. Experimental investigation of doublepipe heat exchangers. Pdf experimental investigation of double pipe heat. Products double pipe heat exchangers heat transfer. The double tube composition allows for unrestricted flow of product, making it the ideal heat exchanger for viscous products.
Experimental analysis of double pipe heat exchanger. Modeling of the heat pipe heat exchangers for heat recovery. 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. Chapter 3 heat exchanger design this chapter will provide the framework on how to design a double pipe and shell and tube type heat exchanger.
This heat exchanger is also suitable where one of both fluids is at very high pressure. The objective of this experiment is to evaluate the performance characteristics of a doublepipe heat exchanger under parallel arrangements having a normal steel pipe and with a copper coated pipe and also the results are examine with the pure copper pipes which will give the. The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. A double pipe, countercurrent, singlephase heat exchanger with. Optimum design of double pipe heat exchanger sciencedirect. Repeat the experiment using counter flow setup on heat exchanger. In the first three sections, saturated steam is supplied to the outer tubes in order to heat the oil. Thermal analysis of double pipe heat exchanger by changing. Experimental investigation of doublepipe heat exchangers in air conditioning applications. Design and experimental analysis of pipe in pipe heat. Experimental investigation on heat transfer coefficient.
Hemmat of mechanical engineering, shahid bahonar university of kernlan, iran abstract the single phase flow and thermal performance of. Therefore, it can not be classified as a compact heat exchanger. Double pipe heat exchanger design dhex is a software tool that is made to demonstrate the chemical design calculations of double pipe hairpin heat exchangers. In this paper a computer simulation was developed by matlab to design the heat pipe heat exchangers. Box 15000, halifax, nova scotia, canada, b3h 4r2, louis.
Heat transfer augmentation techniques ultimately results in the reduction of thermal resistance in a conventional heat exchanger by generating higher convective heat transfer coefficient. To demonstrate the basic equations of heat exchanger operation. In the present study the performance of a concentric tube heat exchanger is analyzed with passive heat transfer. Double pipe heat exchangers are also known as hairpin, jacketed pipe, jacketed utube and concentric pipe. 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. This program can be considered as a simple tool for modeling and designing heat pipe heat exchangers. Pipe in pipe heat exchanger are used in industrial process to recover heat between two process fluids. Detailed theoretical discussion on the principles of heat transfer was consciously left to readers to read standard textbook in. The author concluded that the doublepipe heat exchanger design would consume a power of 51,000 kwhyear, which is lesser than that consumed by the typical existing system. A practical guide for planning, selecting and designing of shell and tube exchangers takes users on a stepbystep guide to the design of heat exchangers in daily practice, showing how to determine the effective driving temperature difference for heat transfer. Double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend.
Counter flow heat exchanger counter flow is preferred, as the difference in temperature between the hot and cold fluids is relatively constant along. Hemmat of mechanical engineering, shahid bahonar university of kernlan, iran abstract the single phase flow and thermal performance of a double pipe heat. Laminar counter and parallel flows in a double pipe heat exchanger is studied experimentally using two types of nanofluids as a cooling medium. Heat exchangers are used in industrial processes to recover heat between two process fluids. 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.
Experimental analysis of double pipe heat exchanger 1urvin r. Double pipe heat exchanger modeling comsol uses in undergraduate education louis desgrosseilliers and dominic groulx mechanical engineering department, dalhousie university corresponding author. A double pipe heat exchanger also sometimes referred to as a pipeinpipe exchanger is a type of heat exchanger comprising a tube in tube structure. Modeling and simulation of the double tube heat exchangers. The tube side flow rate is varied from the 100 lph to 600 lph same time annulus side flow rate is maintained constant. Yau developed an empirical model for the hvac system of an operating theatre to test the design of a doublepipe heat exchanger in the air handler unit. The design of double pipe heat exchanger for the laboratory used is aim to. Checalc chemical engineering calculations to assist process, plant operation and maintenance engineers. Experiment regarding heat exchanger concurrentcountercurrent flows at same rate and different rates. The heat exchange duty a llows calculation of the log mean.
Pdf the overall heat transfer characteristics of a. The software will do all the thermal calculations involved in the design and will generate a summary of. Double pipe heat exchanger modeling comsol uses in. The heat exchanger consists of two thin wall copper tubes mounted concentrically on a panel. 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. Double pipe heat exchanger this project work is based on design and thermal analysis of double pipe heat exchanger. The overall heat transfer characteristics of a double pipe heat exchanger. One fluid flows in the inner pipe, while a second fluid flows in the outer pipe annuals. Heat exchanger demonstration lab double pipe he shell. The influence of the mass flow of the shell side and the logarithmic mean temperature difference is studied. To understand the basic operation of heat exchangers.
Double pipe heat exchanger design software hairpin heat. The simplest heat exchanger is one for which the hot and cold fluids move in the same or. This video describes how to use chemcad to model a double pipe heat exchanger. Batas daerah entrance pada doubel pipe heat exchanger ini adalah 30 cm. Experimental studies of double pipe helical coil heat. Two cold water streams cooling medium flow through central pipe and outer annular space in same direction. The experimental results demonstrate that the heat transfer coefficient of the exchanger increase with increasing of the logarithmic mean. The project carried out design of pipe in pipe heat exchanger having tube with fin and without fin.
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