Double pipe heat exchanger posted in chemical process simulation. This type of heat exchangers are mostly used in the fields of thermal power station, petroleum and heat industry. 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. 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. The theories of transient heat transfer in doublepipe heat exchangers were explained and followed by literature correlations. Calculate the rotameter setting for the desired waterside flow rate. 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.
Double pipe heat exchanger is perhaps the simplest of all heat exchanger types. Products double pipe heat exchangers heat transfer. 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. Double pipe heat exchanger design with counterflow or. I just need a simple model, that is to said a tube inside the other. Base your calculation on the outside area of the inside pipe. 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. They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum refineries, natural. Che245 lab report solteq concentric tube heat exchanger unit he. In this chapter we will examine the basic theory of heat exchangers. A device whose purpose is the transfer of slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Convective heat transfer from the outer tube wall to the outside fluid. In contrast to the parallel flow heat exchanger, the counter flow heat exchanger can have the hottest coldfluid. Hi, i need to simulate a double pipe hx with hysys.
Longer contact time and higher heat exchange surface area allows greater heat tran. A heat exchanger is a system used to transfer heat between two or more fluids. The double pipe heat exchanger is, in its simplest form, one pipe held concentrically inside of a larger pipe thus the name double pipe. It can be operated as a parallel flow or as a counterflow heat exchanger. Although the necessary equations for heat transfer and the pressure drop in a double pipe heat. Is it possible to select a tema configuration in order to make a paralelism. Heat exchanger demonstration lab double pipe he shell. All about double pipe heat exchangers what you need to know. Double pipe heat exchanger ce 328 spring 2003 objective. Ntu relationships are given for a simple double pipe heat.
Which is more efficient, shell and tube heat exchangers or. 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. The hot and cold flows are assumed to be steady, 2d axisymmetric, turbulent and incompressible, with constant properties. Carbon steel copper inconel monel nickel stainless steel. This excel spreadsheet helps you design a double pipe heat exchanger also known as a concentric tube heat exchanger. Retain extra sig figs since this is an intermediate calculation. Che245 lab report solteq concentric tube heat exchanger. 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. Institute utilizes a double pipe heat exchanger to facilitate the analysis and understanding of heat transfer inside a heat exchanger.
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. Heat exchangers 73 individual thermal resistances of the system. Optimization of the shellandtube heat exchanger by simplified conjugated gradient method. A procedure for use of the equipment and the software was outlined. Various doublepipe heat exchanger working fluid characteristics and performance enhancement abilities were discussed by several researchers 27, 28, 29. 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 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. It is therefore possible to heat or cool fluids or gases which have minimal energy levels. The double pipe heat exchanger uses pressurized steam in an outer tube to heat water pumped through an inner tube. The theories of transient heat transfer in double pipe heat exchangers were explained and followed by literature correlations. Design and construction of a concentric tube 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. To study and evaluate the effects of flow conditions and flow configurations on the rate of heat transfer through thin walled tubes. The figure of the mesh of the double pipe heat exchanger with twisted tape is shown below. 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. Unit operations lab heat exchanger 12 theory notes 1. The overall heat transfer characteristics of a double pipe.
Double pipe heat exchanger, double pipe heat exchanger. We discuss the design theory of regenerators in detail in chapter 5. Equations for calculating the overall heat transfer coefficient for a double pipe heat exchanger with no phase changes. 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 article presents an understanding of what double pipe heat exchangers are. To understand the basic operation of heat exchangers. Double pipe heat exchanger chemical process simulation. A wide variety of double pipe heat exchanger price options are available to you, such as ccc, ce, and rohs. Design and analysis of a newly installed plate heat. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. 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. Pdf the double pipe heat exchanger is one heat exchanger pipe inside another larger. The heat exchange duty a llows calculation of the log mean.
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. This paper investigates the design optimization of double pipe heat exchanger using mathematical programming. 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. 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. Heat exchangers are used in both cooling and heating processes. Double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend. 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. I tried with the shell and tube hx but this is not what i have to simulate. April 2012 journal of computational and theoretical. The theory behind the operation of a doublepipe heat exchanger was discussed in detail by f. Double pipe heat exchangers are also known as hairpin, jacketed pipe, jacketed utube and concentric pipe.
We provide high and international quality standards double pipe heating system. A heat exchanger follows this principle in its endeavour to reach equalisation. In this paper, fabrication of double pipe heat exchanger and standardized in laboratory scale by studied theoretical and experimental values for parameters. We using latest raw material in the making development of double pipe heat exchangers. Fired heaters the selection of a heat exchanger depends on many factors including capital and. An experimental and theoretical study of natural convection in the annulus between horizontal concentric cylinders. 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. 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. Gasket and lining can be damaged if a pipe is connected in the wrong way. Overall heat transfer coefficient for doublepipe heat. A double pipe heat exchanger like shell and tube heat exchangers. Counter flow heat exchangers are the most efficient of the three types. A double pipe heat exchanger consists of one pipe inside another.
With a plate type heat exchanger, the heat penetrates the surface, which separates the hot medium from the cold one very easily. Water flows inside the inner pipe and steam flows through the annulus formed between the two pipes. Heat exchangers are used in industrial processes to recover heat between two process fluids. A procedures manual was created for the doublepipe heat exchanger. 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. To determine the overall heat transfer coefficient for the double pipe heat exchanger for countercurrent flow and parallel or cocurrent flow.
Doublepipe shellandtube spiral tube pipe coils crossflow to tubes parallel flow to tubes. Connect a pipe in the way it is meant to be connected to the plate heat exchanger. Combining each of these resistances in series gives. The aim of design is to heat the naoh using the steam. They have a particular advantage when close temperature approaches are needed or in high pressure applications. Heat exchangers are typically classified according to flow arrangement and type of construction. The concentric tube heat exchanger was designed in order to study the process of. Alibaba manufacturer directory suppliers, manufacturers. To demonstrate the basic equations of heat exchanger operation. Optimal design of double pipe heat exchanger structures. Experimental investigation of doublepipe heat exchangers. How to model a double pipe heat exchanger2 youtube. Che 120b 1 heat exchangestheory the doublepipe heat. The heat exchanger consists of two thin wall copper tubes mounted concentrically on a panel.