The principal parts are two sets of concentric pipes, two connecting tees, and a return head and a return bend as shown in fig. The heat exchange duty a llows calculation of the log mean. Thermal design during heat exchanger design often overall heat transfer coefficient is used that connects the rate of heat transfer to the temperature difference of the system. Some geometrical data about the exchanger are listed in table 1. Mar 02, 2016 double pipe heat exchanger this application models the temperature dynamics of a countercurrent double pipe heat exchanger. Each of those parameters will be discussed briefly in the next three sections. A procedures manual was created for the doublepipe heat exchanger. An overview of heat exchanger design problems, a summary of key issues to cover in the design process, and a design methodology of heat exchangers is presented in this chapter. You may need to pay at some moment to continue using product or to use all functionalities. May 01, 2008 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. To understand the basic operation of heat exchangers. In this paper the optimal design of the exchanger has been formulated as a geometric programming with a single degree of difficulty.
Unlike other tools, ensures that the calculations are performed step by step to help in understanding the design calculations. Heat exchanger design and heat transfer coefficients. Klm technology group process design of double pipe. Shell and tube heat exchangers basic calculations pdh online. Heat exchanger design and heat transfer coefficients archives.
In heat exchanger, is the appropriate average temperature difference to use in heat transfer calculations. A typical double pipe heat exchanger basically consists of a tube or pipe fixed concentrically inside a larger pipe or. Secondly, the required wall thickness t cr of the connecting cylinder is determined. Determination of the heat transfer surface area needed for a double pipe heat exchanger design can be done using the basic heat exchanger equation. The software will do all the thermal calculations involved in the design and will generate a summary of all resultsetc gasketed plate heat exchanger design v. A constant speed pump is used to pump the hot water from the tank into the inner tube. Condenser heat exchanger is very common in process industry, condensers may be classified in two main types.
The software will do all the thermal calculations involved in the design and will generate a summary of all results, list of main functions. Combining each of these resistances in series gives. Introductionhorizontal double pipe heat exchanger uses various inserts inside tube so as to enhance heat transfer and hence increase heat transfer coefficient 1,2,3. Fluid engine oil sea water inlet temperature, c 65 20 outlet temperature, c 55 25 heat load, kw 117. 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. Pdf engineering education is incomplete without laboratory practices. Double pipe heat exchanger a when the other fluid flows into the annular gap between two tubes, one fluid flows through the smaller pipe. A double pipe heat exchanger is constructed from two pipes, one inside the other.
First fluid flows inside the inner pipe while the second fluid flows in the annular space between the two pipes. Checalc chemical engineering calculations to assist process, plant operation and maintenance engineers. Double pipe heat exchanger design software hairpin heat. Condensers which have a coolant and a condensing vapor brought into direct contact and other types which have the coolant and a condensate stream separated by a tube wall or a solid surface. Design concept is to develop a mathcad modeling for a miniature shellandtube heat exchanger and then seek the solution by iterating the calculations by varying the.
Calculate the heat transfer area of the double pipe heat exchanger in the lab. Calculate the required heat transfer rate, q, in btuhr from specified information about fluid flow rates and temperatures. The analytical stage in this paper shows the validity of the. Since the exchanger is custom designed, the tube size can be smaller than nps 18 dn 6 mm that is the smallest size in table c. Double pipe heat exchanger design step by step software. Optimum design of double pipe heat exchanger sciencedirect. Base your calculation on the outside area of the inside pipe. Cfd study of helically coiled double pipe heat exchangers for laminar flow situations were carried out by rennie and raghavan 2005, 2006a. Note that we used the average of two heat transfer rates in calculations. To obtain larger heat exchange area, several pipes are arranged sidebyside and fittings are attached to allow the fluids to contact the pipes in series.
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. Introductionhorizontal double pipe heat exchanger uses various inserts inside tube so as to enhance heat transfer and hence increase heat transfer. A heat exchanger thermal design calculations spreadsheet. The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. Make an initial estimate of the overall heat transfer coefficient, u, based on. 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. This excel spreadsheet helps you design a double pipe heat exchanger also known as a. The software will do all the thermal calculations involved in the design and will generate a summary of all results. Double pipe heat exchanger design free download and.
For example in case of a boiler type heat exchanger or when space is required for sliding strips. But the information available for tthe is still less compared to double pipe heat. The double pipe heat exchanger design calculations formulas heat exchangers can be classified in a number of ways, depending on their construction or on how. The equations for the analysis of a double pipe heat exchanger are stated and are summarized in the following suggested order. Shell and tube heat exchanger design software for thermal. These types of heat exchangers found their applications in heat recovery processes, air conditioning and refrigeration systems, chemical reactors, and food and dairy processes 2. Double pipe heat exchanger design is licensed as demo which means that software product is provided as a free download to users but it may be limited in functionality or be timelimited. Flow in a doublepipe heat exchanger can be cocurrent or. Design a double pipe heat exchanger with bare inner multitubes that. Dhex is a software tool that is made to demonstrate the chemical design calculations of double pipe hairpin heat exchangers. Pdf design and construction of a double pipe heat exchanger. Analysis of double pipe heat exchangers, suggessted order.
The software will do all the thermal calculations involved in the design and will generate a summary of. The temperature difference between the fluid and the wall varies along the length of the heat exchanger. Horizontal double pipe heat exchanger uses various inserts inside tube so as to enhance heat transfer and. Mass flow rate heat transfer coefficient hot fluid outlet temperature cold fluid outlet temperature lpm k k 4 260. Double pipe heat exchanger design can be installed on windows xpvista78 environment, 32bit version. Double pipe heat exchanger design has had 1 update within.
Conclusion the design and analysis of the double pipe heat exchanger has been a great success. Optimized design parameters when heat transfer and compactness are prioritized35 table 54. The set of equations for design and performance analysis of tthe have been developed. In otherwords, the objective function was minimizing total cost with regards to the mentioned formula. Q is the rate of heat transfer between the two fluids in the heat exchanger in btuhr. Three partial differential equations describe heat balances across the tube and shellside liquids. At the beginning of the calculation must be decided the. Fluid placement should be based on either the hydraulic criterion minimizing the pressure drop or the fouling criterion easy mechanical cleaning of the heat exchanger. They are fairly cheap, but the amount of space they occupy is generally high compared with the other types.
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 utilized in a wide variety of applications including refrigeration, air conditioning. Double pipe heat exchanger design calculations formulas heat exchangers can be classified in a number of ways, depending on their construction or on how the fluids move relative to each other through the device. Double pipe heat exchanger calculation does the thermal and hydraulic design of double pipe heat exchangers and estimate number of hairpin required. Optimized design parameters when heat transfer and pressure drop are prioritized. This project work is based on design and thermal analysis of double pipe heat exchanger. Thermal performance of a doublepipe heat exchanger with a. Pdf on jan 1, 2018, mate petrik and others published optimal. Design a double pipe heat exchanger with bare inner multitubes that can be used to cool engine oil with cold sea water. Condenser heat exchanger thermal analysis and design.
The image shows only the beginning of the calculations. Gaskets are placed between the two flanges to make the joint leak free. Pdf the double pipe heat exchanger is one heat exchanger pipe inside another larger pipe. The two most common heat exchanger design problems are those of rating and sizing. Demonstrate the double pipe heat exchangers calculations that are commonly involved in the design of your project using this application. Therefore, the optimal heat exchanger area, input and output. Calculate convective heat transfer coefficient for shell side ho.
Researchers have done theoretical as well as experimental analysis of triple concentric pipe heat exchanger. A new and fast calculation procedure methodology is. Double pipe heat exchanger design calculations formulas. Our builtin antivirus checked this download and rated it as virus free. Gnielinski correlation for the heat transfer coefficient of the shell side and tube side fluids hh and hc. Overall heat transfer coefficient for doublepipe heat. Figure 2 shows the required wall thickness of t cr for a carbon steel cylinder with an external diameter of d o mm as a function of the design pressure p d.
Double pipe heat exchanger design free version download. Schematic of the double pipe finned heat exchanger and its discretization. Aug 10, 2011 for a heat exchanger thermal design calculations spreadsheet, the heat exchanger equation can be used to calculate the required heat exchanger area for known or estimated values of the other three parameters, q, u, and. The screenshot below shows a heat exchanger thermal design calculations spreadsheet that can be used to carry out thermal design of a double pipe heat exchanger. Download double pipe heat exchanger design for windows to make step by step thermal design calculations of double pipe heat exchangers. Design, construction, and maintenance of heat exchangers. Double pipe heat exchanger design free version download for pc. Heat exchangers 73 individual thermal resistances of the system. Pdhonline course m371 2 pdh shell and tube heat exchangers.
However, since double pipe heat exchangers are simple, they are used to teach heat exchanger design basics to students as the fundamental rules for all heat exchangers are the same. Lectures 19 applied heat transfer cm3110 1232019 3 t, outer bulk temperature t, inner bulk temperature l but. Analysis of double pipe heat exchangers, suggessted order of. Fluid engine oil sea water inlet temperature, c 65 20 outlet temperature, c 55 25 heat. Aug 26, 2002 the doublepipe heat exchanger is one of the simplest types of heat exchangers. The doublepipe heat exchanger is one of the simplest types of heat exchangers. If you are a student using this manual, you are using it without permission. Design calculation result of double pipe heat exchanger b cfd analysis result of double pipe heat exchanger.
The design stages mentioned in the literature can applicable for all the simple designing of double pipe heat exchangers. Overall heat transfer coefficient for doublepipe heat exchanger. A double pipe heat exchanger design and optimization for cooling. The amount of heat transfer per section is small, that makes the double pipe heat exchangers a suitable heat transfer device in applications where a large heat transfer surface is. The double pipe heat exchanger is in the vertical position. In thermal design we tabulate physical properties of. A procedures manual was created for the double pipe heat exchanger. Dimensioning a heat exchanger flange p3 engineering. Double pipe heat exchangers have a simple construction. When the fluid is free to move in the transverse direction, the crossflow is said to be. Double pipe heat exchanger dphx dphx design considerations pressure drop pipe or annulus should be less than 70 kpa. Design of double pipe heat exchanger international.
The software will do all the thermal calculations involved in the design and will generate a summary of all resultsetc double pipe heat exchanger design screenshot version. Double pipe heat exchangers are normally designed in a hairpin shape and are fabricated in accordance with asme code. Make an initial estimate of the overall heat transfer coefficient, u, based on the fluids involved. Double pipe heat exchanger design dhex free download. They are utilized in a wide variety of applications including refrigeration, air conditioning, power plants, and petroleum refineries, among others. Double pipe heat exchangers dphe are devices that exchange heat between two fluids of different temperatures that are separated by a solid wall. Double pipe heat exchanger manufacturers india heat. Pdf design of double pipe heat exchanger kirti zare.
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