In this paper, fabrication of double pipe heat exchanger and standardized in laboratory. Calculation program, double pipe heat exchangers, experiment research, heat transfer coefficient htc. Experimental investigation on heat transfer coefficient for the double pipe heat exchanger. Based on sources i referred, i got to know that a double pipe heat exchanger operates in a way where hot water flows in a pipe and comes out as cold water and cold water flows into another pipe. Engineering senior design project double pipe heat exchanger university of central oklahoma. The inner diameters of two transport lines were both 4 mm for small flow resistance. 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. There are thus three heat transfer operations that need to be described. Double pipe heat exchanger experiment qvndo5jowg4x idocpub. Experimental study of heat transfer capacity for loop heat. Experimental investigation on heat transfer coefficient. Pdf heat exchangers are using in processes to recover heat between two process.
Pdf experimental investigation of double pipe heat. Repeat the experiment using counter flow setup on heat exchanger. Base your calculation on the outside area of the inside pipe. 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. In a laboratory experiment, we will use a double pipe heat exchanger as shown below. The high stresses produced by differential thermal expansion between outer and inner pipes are more easily handled. 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. Double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend. The vapor line and liquid line made of ss304 were 1620 mm and 1480 mm in length, respectively. Which is more efficient, shell and tube heat exchangers or. Heat exchangers 73 individual thermal resistances of the system.
In this experiment, the type of heat exchanger that was used is double pipe heat exchanger with counter flow arrangement. However, in this experiment the focus is only on parallel flow and counter flow inside the concentric pipe. Qualitative dependence of the fluid temperature on position inside a singlepass heat exchanger is shown in fig. Pdf experimental investigation for the heat transfer of a double. Hence, this study aims to investigate and compare the thermal performance enhancements of srtts and stationary twisted tapes stts in a double pipe heat exchanger, and also to examine as the effect of various fabrications e. The heat exchange duty a llows calculation of the log mean. Pdf heat exchanger lab experiment chemical engineering. Heat exchanger demonstration lab double pipe he shell.
What are practical applications of double pipe heat. Doublepipe heat exchanger experiment engineers guide. The flow pattern of the two fluids in the heat exchanger is a parallel flow. Overall heat transfer coefficient for doublepipe heat. This paper investigates the enhancement of heat transfer coefficient and nusselt number of a nanofluid containing nanoparticles. The experimental results demonstrate that the heat transfer coefficient of the exchanger increase with increasing of the logarithmic mean.
In the inner pipe, cold water is pumped to obtain heated water at the exit. The area density for double pipe heat exchanger can not be in the order of 700. If you continue browsing the site, you agree to the use of cookies on this website. The basic component of a heat exchanger can be viewed as a tube with one fluid running through it and another fluid flowing by on the outside. Table 1 observation table for parallel flow constant. Experiment regarding heat exchanger concurrentcountercurrent flows at same rate and different rates. The overall heat transfer characteristics of a double pipe. The other performance parameter like heat transfer coefficient and heat transfer rate obtained through experiment is also. 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. The most widely used double pipe heat exchanger is the hair pin. Heat transfer in rotating systems has been the subject of many experimental and theoretical studies.
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. The experimental results demonstrate that the heat transfer coefficient of the exchanger. Design a double pipe heat exchanger with bare inner multitubes that can be used to cool engine oil with cold sea water. 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. Manifolding of a multiple hairpin setup is easily accommodated. In the beginning we conducted the experiment without any baffle to get the performance parameter for plane heat exchanger and then with baffle of pitches 50 mm. Experimental investigation of double pipe heat exchanger. Experimental investigation of double pipe heat exchanger by using semi circular disc baffles sarmad a.
Counter flow heat exchangers are the most efficient of the three types. Experimental and exergy analysis of a double pipe heat. Heat transfer in double pipe heat exchanger with circumferencerectangular grooves has been investigated. 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. 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.
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. In this heat exchanger, we will heat water in a water heater similar to the one commonly used in domestic water heating. In the first three sections, saturated steam is supplied to the outer tubes in order to heat the oil. Engineering senior design project double pipe heat. 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. Three types of fluid motion direction inside the heat exchanger are parallel flow, counter flow and cross flow. Therefore, it can not be classified as a compact heat exchanger. This excel spreadsheet helps you design a double pipe heat exchanger also known as a concentric tube heat exchanger.
To understand the basic operation of heat exchangers. 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. Calculate the heat transfer area i 6 of the double pipe heat exchanger in the lab. 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. This project work is based on design and thermal analysis of double pipe heat exchanger. 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 exchangers, with their typical uturn shape, are one of the simplest and cheapest type of heat exchangers used in the chemical process industry. The theories of transient heat transfer in double pipe heat exchangers were explained and followed by literature correlations.
Combining each of these resistances in series gives. Comparison of experimental data with predictions of standard correlations article pdf available january 2001 with. 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. Ya hussain 68 the overall heat transfer coefficient represents the ease with which heat is transferred from one medium to another. We certify that the project entitled design of small heat exchanger double pipe type is written by mohamad shafiq bin alias. Heat transfer of nanofluid in a double pipe heat exchanger.
Evaporator and condenser diw flowrates used in the experiment. The doublepipe heat exchanger is one of the simplest types of heat exchangers. Experimental study for double pipe heat exchanger with rotating inner pipe. Laminar counter and parallel flows in a double pipe heat exchanger is studied experimentally using two types of nanofluids as a cooling medium. Experimental investigation of doublepipe heat exchangers. In this paper, fabrication of double pipe heat exchanger and standardized in laboratory scale by studied. A procedures manual was created for the doublepipe heat exchanger. The heat exchanger consists of two thin wall copper tubes mounted concentrically on a panel. Pdf the overall heat transfer characteristics of a.
Temperature approach optimization in the double pipe heat. A procedures manual was created for the double pipe heat exchanger. A device whose purpose is the transfer of thermal energy between two fluids. The main purpose of heat exchanger is to remove the heat from the hot fluid and transfer it. 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. The simplest heat exchanger is one for which the hot and cold fluids move in the same or. The double pipe heat exchanger consists of six lengths of concentric tubing set out as shown in figure 1. Design and analysis of a newly installed plate heat. Doublepipe heat exchangers are used in many industries because of their low design and maintenance costs, flexibility, and low installation costs 25. Flow in a doublepipe heat exchanger can be cocurrent or countercurrent. Experimental investigation on heat transfer coefficient for the. Creating geometry in the project schematic, double click the geometry. To demonstrate the basic equations of heat exchanger operation.
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. Al 2 o 3 with a particle size of 20 nm and volume fraction of 0. An experimental setup is designed and constructed to study the heat transfer coefficient of the double pipe heat exchangers in this paper. The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. The influence of the mass flow of the shell side and the logarithmic mean temperature difference is studied. The nanofluids consist of al 2 o 3 and tio 2 nanoparticles, which were added to the base fluid deionized. 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.
The theories of transient heat transfer in doublepipe heat exchangers were explained. 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. Hemmat of mechanical engineering, shahid bahonar university of kernlan, iran abstract the single phase flow and thermal performance of a double pipe heat. Longer contact time and higher heat exchange surface area allows greater heat tran. To determine the overall heat transfer coefficient for the double pipe heat exchanger for countercurrent flow and parallel or cocurrent flow. 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. The overall heat transfer characteristics of a double pipe heat exchanger.
Av6 ball valves for pipe draining figure 3 schematic of the experimental unit 25. Doublepipe heat exchangers are considered one of the practical solutions in todays. They have a particular advantage when close temperature approaches are needed or in high pressure applications. Fluid engine oil sea water inlet temperature, c 65 20 outlet temperature, c 55 25 heat. Experimental investigation of doublepipe heat exchangers in air. The default working environment for geometry is 3d. Abstract in this experiment, the group was able to compute for the overall heat transfer coefficient in a heat exchanger. Pdf the double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. Calculate the heat transfer area of the double pipe heat exchanger in the lab. View lab report double pipe from chemical e 1 at adamson university. Doublepipe abstract in this experiment the group was.
The double pipe heat exchanger used as the condenser was 1260 mm in length. Pdf experimental study for double pipe heat exchanger with. Hot oil flows through the center tube in all six sections. 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. The scheme of experimental apparatus for experiment work and the sensors which are set in equipment are shown in figure 3, determined as follows. A heat exchanger is a device used for the process of heat exchange between two fluids that are at different temperatures.
1206 487 432 37 747 957 566 384 1154 1395 1328 1315 1252 1164 514 1116 1425 293 436 1286 805 1253 187 34 509 821 821 494 615 640 908 111 1072 895 1231 1070