Double pipe heat exchanger posted in chemical process simulation. Fired heaters the selection of a heat exchanger depends on many factors including capital and. Double pipe heat exchanger is perhaps the simplest of all heat exchanger types. This type of heat exchangers are mostly used in the fields of thermal power station, petroleum and heat industry. In the 1d analysis we get a similar result to the doublepipe exchanger. They have a particular advantage when close temperature approaches are needed or in high pressure applications. In contrast to the parallel flow heat exchanger, the counter flow heat exchanger can have the hottest coldfluid. Convective heat transfer from the outer tube wall to the outside fluid. Heat exchangers are used in both cooling and heating processes. A procedures manual was created for the doublepipe heat exchanger.
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. 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. All about double pipe heat exchangers what you need to know. Base your calculation on the outside area of the inside pipe. Connect a pipe in the way it is meant to be connected to the plate 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 exchanger are examined by experimental methods. I tried with the shell and tube hx but this is not what i have to simulate. Which is more efficient, shell and tube heat exchangers or. 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. 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 exchangers often also referred to as double pipes are characterized by a construction form which imparts a ushaped appearance to the heat exchanger.
Longer contact time and higher heat exchange surface area allows greater heat tran. Doublepipe shellandtube spiral tube pipe coils crossflow to tubes parallel flow to tubes. Overall heat transfer coefficient for doublepipe heat exchanger calibrate thermocouples pump water through inner pipe of doublepipe heat exchanger rate determined by rotameter flow steam through outer pipe of doublepipe heat exchanger measure rate by pail and scale. A heat exchanger is a system used to transfer heat between two or more fluids. Heat exchangers are typically classified according to flow arrangement and type of construction. How to model a double pipe heat exchanger2 youtube. This article presents an understanding of what double pipe heat exchangers are. The knowledge of the principles of heat transfer within the heat exchanger are needed in order to design andor evaluate the performance of a heat exchanger. The heat exchange duty a llows calculation of the log mean. Double pipe heat exchanger chemical process simulation. 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. 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. Design and analysis of a newly installed plate heat. 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.
They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum refineries, natural. Calculate the rotameter setting for the desired waterside flow rate. 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. Optimal design of double pipe heat exchanger structures. A device whose purpose is the transfer of slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. In this paper, fabrication of double pipe heat exchanger and standardized in laboratory scale by studied theoretical and experimental values for parameters. Carbon steel copper inconel monel nickel stainless steel. The figure of the mesh of the double pipe heat exchanger with twisted tape is shown below. The theory behind the operation of a doublepipe heat exchanger was discussed in detail by f.
On semiwelded units it is a safety issue if the wrong pipe is connected to the wrong port, double check that the correct media is connected to the. 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. Double pipe heat exchanger, double pipe heat exchanger. Retain extra sig figs since this is an intermediate calculation. The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. We have to design a double pipe heat exchanger as per the same operating conditions of plate heat exchanger and the above mentioned fluid properties. Unit operations lab heat exchanger 12 theory notes 1. Although the necessary equations for heat transfer and the pressure drop in a double pipe heat. We using latest raw material in the making development of double pipe heat exchangers. The aim of design is to heat the naoh using the steam.
I just need a simple model, that is to said a tube inside the other. The heat exchanger area is minimized and the thermofluid dynamic conditions are considered for the use of the right transport correlations, together with design specifications, such as, maximum pressure drops and minimum excess area. A wide variety of double pipe heat exchanger price options are available to you, such as ccc, ce, and rohs. It is therefore possible to heat or cool fluids or gases which have minimal energy levels. Double pipe heat exchanger ce 328 spring 2003 objective. In its classical sense, the term double pipe refers to a heat exchanger consisting of a pipe within a pipe, usually of a straightleg. Subscripts h and c refer to the hot and cold fluids, respectively, and subscripts i and o refer to the inlet and outlet of the heat exchanger, respectively. In this chapter we will examine the basic theory of heat exchangers. In this paper, studied overall heat transfer coefficient in fabricated of double pipe heat exchanger in laboratory scale by using smooth pipe and twist tape experimentally for affecting parameters.
This excel spreadsheet helps you design a double pipe heat exchanger also known as a concentric tube heat exchanger. The double pipe heat exchanger is, in its simplest form, one pipe held concentrically inside of a larger pipe thus the name double pipe. Calculate the heat transfer area of the double pipe heat exchanger in the lab. We discuss the design theory of regenerators in detail in chapter 5.
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. Che245 lab report solteq concentric tube heat exchanger. Various doublepipe heat exchanger working fluid characteristics and performance enhancement abilities were discussed by several researchers 27, 28, 29. Hi, i need to simulate a double pipe hx with hysys. Institute utilizes a double pipe heat exchanger to facilitate the analysis and understanding of heat transfer inside a heat exchanger. The heat exchanger theory article provides you with information about the fundamentals of a heat exchanger and will be useful for a heat exchanger inspection concept to describe this theory, you may know we need to heat or to cool process fluids in industrial plants to facilitate process reactions. Counter flow heat exchangers are the most efficient of the three types. Double pipe heat exchanger design with counterflow or. A double pipe heat exchanger consists of one pipe inside another. Heat exchangers 73 individual thermal resistances of the system. Gasket and lining can be damaged if a pipe is connected in the wrong way. The concentric tube heat exchanger was designed in order to study the process of.
Pdf the double pipe heat exchanger is one heat exchanger pipe inside another larger. Optimization of the shellandtube heat exchanger by simplified conjugated gradient method. Ntu relationships are given for a simple double pipe heat. This paper investigates the design optimization of double pipe heat exchanger using mathematical programming. Double pipe heat exchangers are also known as hairpin, jacketed pipe, jacketed utube and concentric pipe. To understand the basic operation of heat exchangers. Overall heat transfer coefficient for doublepipe heat. Design and construction of a concentric tube heat exchanger. The hot and cold flows are assumed to be steady, 2d axisymmetric, turbulent and incompressible, with constant properties. Heat exchangers are used in industrial processes to recover heat between two process fluids. The heat exchanger consists of two thin wall copper tubes mounted concentrically on a panel. An experimental and theoretical study of natural convection in the annulus between horizontal concentric cylinders. Experimental investigation of doublepipe heat exchangers. 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.
With a plate type heat exchanger, the heat penetrates the surface, which separates the hot medium from the cold one very easily. The double pipe heat exchanger uses pressurized steam in an outer tube to heat water pumped through an inner tube. We provide high and international quality standards double pipe heating system. A heat exchanger follows this principle in its endeavour to reach equalisation. A double pipe heat exchanger like shell and tube heat exchangers. Combining each of these resistances in series gives. The inner pipe acts as the conductive barrier, where one fluid flows through this inner pipe and another flows around it through the outer pipe, forming an annulus shape. A procedure for use of the equipment and the software was outlined. Equations for calculating the overall heat transfer coefficient for a double pipe heat exchanger with no phase changes. Double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend. To demonstrate the basic equations of heat exchanger operation. Water flows inside the inner pipe and steam flows through the annulus formed between the two pipes.
It can be operated as a parallel flow or as a counterflow heat exchanger. The theories of transient heat transfer in doublepipe heat exchangers were explained and followed by literature correlations. The theories of transient heat transfer in double pipe heat exchangers were explained and followed by literature correlations. To determine the overall heat transfer coefficient for the double pipe heat exchanger for countercurrent flow and parallel or cocurrent flow. April 2012 journal of computational and theoretical. Is it possible to select a tema configuration in order to make a paralelism. Alibaba manufacturer directory suppliers, manufacturers. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact.
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