Heat exchanger design calculations

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Shell and Tube Heat Exchanger type exchangers are used in many process industries, as well as nuclear power stations as condensers, steam generators in pressurised water reactor power plants, and feed water heaters.

They are also used in many other applications i. This type of heat exchangers offers a great flexibility to meet almost any service requirement. Shell and Tube Heat Exchanger as the name proposed, they are built around tubes mounted in a cylindrical shell, the tubes are parallel to the shell. One fluid flows inside the tubes is called the Tube Side Fluidwhile the other fluid flows across and along the axis of the exchanger in the shell side Shell Side Fluid.

To check the latest update history of this software please click here. Checking the version history against the version you have will allow you to identify all changes to this software. Click here for screen shots on Facebook Click here for Screen shots on Flicker. Skip to content Shell and Tube Heat Exchanger type exchangers are used in many process industries, as well as nuclear power stations as condensers, steam generators in pressurised water reactor power plants, and feed water heaters.

Support S. I Units and English U. S Units of measurement Units converter containing 23 measurements and units conversions Save, Load and generate result in different formats Unknown Flow rate, Unknown temperature, on either shell or tube side can be calculated. Select from different correlations to calculate shell or tube heat transfer coefficient.

The database also included critical properties, boiling and melting points and come as a standalone interface but easily integrated with the software. Estimate mixture properties. Tube counts Fouling factors and Overall heat transfer coefficients included. Export results to Microsoft excel generated data sheet for editing. Export Results summary to.Read on for information about the use of a heat exchanger design thermal design calculations spreadsheet for a double pipe heat exchanger.

Each of those parameters will be discussed briefly in the next three sections. The driving force for a heat transfer process is always a temperature difference. For heat exchangers, there are always two fluids involved, and the temperatures of both are changing as they pass through the heat exchanger.

Thus some type of average temperature difference is needed. Many heat transfer textbooks e. The definition of the log mean temperature difference is shown in the figure above. 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. The equation to be used is shown below for both the hot fluid and the cold fluid:.

The heat transfer rate, Q, can be calculated in a preliminary heat exchanger design spreadsheet if the flow rate, heat capacity and temperature change are known for either the hot fluid or the cold fluid. Then one unknown parameter can be calculated for the other fluid.

The overall heat transfer coefficient, U, depends on the convection coefficient inside the pipe or tube, the convection coefficient on the outside of the pipe or tube, and the thermal conductivity of the pipe wall. See the article, Forced Convection Heat Transfer Coefficient Calculationsfor information about calculating the heat transfer coefficients and click here to visit our spreadsheet storefor spreadsheets to calculate the inside and outside convection coefficients and to calculate the overall heat transfer coefficient.

Shell and Tube Heat Exchanger

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.

The image shows only the beginning of the calculations. The rest of the spreadsheet will calculate the length of pipe needed, the length of each pass for a selected number of degree bends, and the pressure drop through the inside of the pipe. Why bother to make these calculations by hand?

This Excel spreadsheet is available in either U. Kakac, S. Bengtson, H. You must be logged in to post a comment. The Overall Heat Transfer Coefficient, U, for a Heat Exchanger Design Spreadsheet The overall heat transfer coefficient, U, depends on the convection coefficient inside the pipe or tube, the convection coefficient on the outside of the pipe or tube, and the thermal conductivity of the pipe wall.

heat exchanger design calculations

A Heat Exchanger Thermal Design Calculations Spreadsheet 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. References 1. Kuppan, T. Leave a Reply Cancel reply You must be logged in to post a comment.In this article, we will take a details look at equations required for shell and tube heat exchanger sizing and design. Shell and tube heat exchangers are widely used and very popular in the process industry, due to their versatility.

Different types of shell and tube exchangers can be easily configured by changing the shell and tube arrangement. Shell and tube heat exchanger design is an iterative process, which goes through the following steps. There are a few equations that are very important for the calculations that we need to perform during heat exchanger design process.

The logarithmic mean temperature difference is an average quantification of the temperature difference between the shell and tube sides. It is calculated with the following equation. However the LMTD is valid only for heat exchanger with one shell pass and one tube pass. For multiple number of shell and tube passes the flow pattern in a heat exchanger is neither purely co-current nor purely counter-current.

This correction factor calculator will help you to quickly calculate the LMTD correction factor for a shell and tube exchanger with multiple shell or tube side passes. Where, we get the A Overall overall heat transfer area required from the heat transfer rate equation Equation OD is the outside diameter of selected tube size L is the total tube length.

This equation is quite straight forward based on the geometry of the selected shell and tube heat exchanger. Tube side velocity is important for estimation of Reynolds number on the tubeside and then for getting the heat transfer coefficient for the tube side fluid. We can use the following equation for tube side velocity. Further, the Reynold's number for the tube side fluid is calculated as.

When we have a handle on the heat transfer area A Overall and temperature difference LMTDthe only remaining unknown in the heat transfer equation Equation-1 is the overall heat transfer coefficient U. Note, this overall heat transfer coefficient is calculated based on the outer tube surface area Ao.

So it must be multiplied by the Ao value for using in the overall heat transfer equation. We already saw that the design of a shell and tube heat exchanger is an iterative process. Often, engineers prefer to use a heat exchanger design software to create a heat exchanger model. You can then use this model to simulate the heat exchanger performance and to verify if it will meet your process requirements.

However, if you decide to manually perform the heat exchanger design and related calculations, here are some calculators and tutorials that can help you. Thermostatic steam traps are operated using changes in fluid temperature. The temperature of saturated steam is dependent upon its pressure. In the steamYou are given the task of designing a heat exchanger similar to that shown in the figure below by using data given in the tables below. The task of the heat exchanger is to cool a hot fluid to a desire temperature.

The direction of hot and cold fluids are provided. As part of the design you will need to determine the dimensions of the heat exchanger. Hello, I have gone through your job posting and become very much interested to work with you.

heat exchanger design calculations

I am an expert in this field. I have already completed several projects like this. For evidence you can see my profile. I am a professional Excel developer using VBA and macro's and also have vast experience of mechanical engineering field.

Hello there! You need transfer your formulas into excel format? I can do your project in less than 24 hours according to your description with the highest precision and quality. Hi, I'm a professional and expert in Data works or projects. Hello sir, Basically i am a mechanical enginner,have experience in automobile field.

And i could really understand the techical terms related to heat transfer. My name is Ilya. I am from Russia. I have a bachelor's degree in thermal physics. Relevant Skills and Experience I have a lot of experience in calculating heat exchangers. I have 33 years experience in Mechanical Engineering design and manufacturing. I have significant experience in designing heat exchangers. It is my pleasure to be complete this project very Fruitfully.

Hi Greetings! I am a Mechanical Engineer with expertise in thermal design. I have done projects similar to this that include Design of Helical Coil Steam Generator, Design of Shell and tube heat excahgers, etc. I have been doing projects as a freelancer for 7 years now. I have the experience of even teaching the excel and also I have thermal analysis experience Relevant Skills and Experience Excel, banking therma analysis.

Freelancer Trabajos Thermal Analysis worable design design a heat exchanger by doing calculations in EXCEL You are given the task of designing a heat exchanger similar to that shown in the figure below by using data given in the tables below.

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Es gratis registrarse y ofertar en los trabajos. Indira Hello sir, Basically i am a mechanical enginner,have experience in automobile field.Read on for information about the use of a heat exchanger design thermal design calculations spreadsheet for a double pipe heat exchanger. Each of those parameters will be discussed briefly in the next three sections.

The driving force for a heat transfer process is always a temperature difference.

Shell & tube heat exchanger calculations

For heat exchangers, there are always two fluids involved, and the temperatures of both are changing as they pass through the heat exchanger. Thus some type of average temperature difference is needed. Many heat transfer textbooks e. The definition of the log mean temperature difference is shown in the figure above.

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. The equation to be used is shown below for both the hot fluid and the cold fluid:. The heat transfer rate, Q, can be calculated in a preliminary heat exchanger design spreadsheet if the flow rate, heat capacity and temperature change are known for either the hot fluid or the cold fluid.

Then one unknown parameter can be calculated for the other fluid. The overall heat transfer coefficient, U, depends on the convection coefficient inside the pipe or tube, the convection coefficient on the outside of the pipe or tube, and the thermal conductivity of the pipe wall.

See the article, Forced Convection Heat Transfer Coefficient Calculationsfor information about calculating the heat transfer coefficients and click here to visit our spreadsheet storefor spreadsheets to calculate the inside and outside convection coefficients and to calculate the overall heat transfer coefficient. 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.

The image shows only the beginning of the calculations.

Design Analysis: Calculating Heat Exchanger Area

The rest of the spreadsheet will calculate the length of pipe needed, the length of each pass for a selected number of degree bends, and the pressure drop through the inside of the pipe. Why bother to make these calculations by hand?

This Excel spreadsheet is available in either U. Kakac, S.

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Bengtson, H. Read on for information about natural convection heat transfer coefficients and Excel spreadsheets to obtain a value for them. Convection heat transfer takes place between a solid surface and fluid that is at a different temperature and is in contact with the surface. If the fluid is flowing past the surface due to an external driving force like a fan or pump, then the heat transfer is called forced convection.

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The Nusselt, Grashof and Prandtl numbers are defined in the box at the left. The following sections provide equations for estimating the heat transfer coefficient for several common natural convection configurations.Types of Industrial Heat Exchangers There are many types of heat exchangers used in a wide variety of industrial applications including power plants, boilers for industrial steam, chemical plants, and many types of manufacturing facilities.

Several different configurations are used to accomplish the basic function of transferring heat from one fluid to another without mixing the two fluids together. The types of heat exchangers described and discussed in these articles include the two most common industrial heat exchangers, the shell and tube heat exchanger and the double pipe heat exchanger, along with information about spiral heat exchangers, flat plate heat exchangers, fin-tube heat exchangers, and condensers.

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Heat Transfer Coefficients and Heat Transfer Fundamentals Convection heat transfer coefficients and log mean temperature differences are needed for heat exchanger design calculations. Natural convection heat transfer coefficients are calculated using a correlation of dimensionless numbers, typically Nusselt number in terms of Grashof number and Prandtl number.

Forced Convection heat transfer coefficients are calculated from correlations of Nusselt number in terms of Reynolds number and Prandtl number. These articles provide information, equations and example calculations for natural convection and forced convection heat transfer coefficients, overall heat transfer coefficients and log mean temperature differences.

There is also information about heat exchanger flow patterns and equations and calculations for combined convection and conduction heat transfer. A preliminary value for the required heat transfer area can be calculated using an estimate of the overall heat transfer coefficient together with information about the required rate of heat transfer, the flow rates of the two fluids, and the inlet and outlet fluid temperatures. Preliminary details of the heat exchanger can then be calculated, including items such as diameter, length, and number of tubes for a shell and tube heat exchanger, diameter and length of the shell, number of tubeside passes, and number of shellside passes.

The allowable pressure drop across the heat exchanger can also be calculated and used in the preliminary design.

Heat Exchanger Theory, Calculations, and Design

With a preliminary detailed design completed, a better estimate of convective heat transfer coefficients and the overall heat transfer coefficient can be made and adjustments can then be made to the preliminary detailed design as necessary.

The use of Excel spreadsheets for the preliminary design calculations is included in some of these articles.

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Heat Exchangers on Ships Heat exchangers are used on ships in the power production process, such as for diesel engines, boilers, and economizers, as well as in production of steam for accommodation and deck equipment. The heat exchangers used include common types used as industrial heat exchangers, such as the shell and tube heat exchanger, the plate heat exchanger, and the fin tube radiator type.

Heat Exchangers in Everyday Life Although most people are not aware of them, heat exchangers are very prevalent all around us in our everyday life. For example, heat exchangers are crucial to operation of furnaces, air conditioning systems, refrigerators and freezers. Automobiles require a heat exchanger in the form of the radiator to provide cooling for the engine and a smaller one for heating of the passenger cabin.

High performance engines use heat exchangers in turbochargers. It is available in rigid and flexible forms and can […]. It is used for water distribution, fire protection, oil, HVAC, […]. Your Name required.

heat exchanger design calculations

Your Email required. Your Message. Your Tel. Call Us Today! Heat Exchanger Theory, Calculations, and Design. Previous Next.Shell and tube heat exchangers are very popular and commonly used heat transfer equipment in the process industry.

This type of heat exchangers consists of metal tubes passing through another metal enclosure, which is referred to as the 'shell'. There are many subtypes of shell and tube exchangers created by different configurations of the shell and tube arrangement. This versatility is one of the reasons why shell and tube exchangers are so popular among process design engineers. To determine these design parameters, a few calculations must be performed for the shell and tube heat exchanger.

In each iteration you need to calculate how the exchanger performs. Following calculators can help you with these heat exchanger sizing calculations. Note all of the following calculators are for demo.

To access the actual working calculators, you will need to create a login on EnggCyclopedia. Apart from these calculators, you can always use a heat exchanger design software to build a model of your heat exchanger design and then to simulate its performance.

For any system, efficiency is normally calculated by comparing the actual performance with ideal performance. Any ice melts by absorbing heat from its surroundings. That raises up its temperature above the melting point. And then ice starts to melt. A form of float switch in a chamber connected with the suction line is used. If the level in the chamber is above the impeller eye of the pump, the float For example, check the meshlike structure of a demister pad in the following image.

heat exchanger design calculations

This mesh is responsible for obstructing the flow of gas with liquid Sign up for free if you are not a member already. Share This!


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