Heat exchangers are typically classified according to flow arrangement and type of construction. Design a double pipe heat exchanger with bare inner multitubes that can be used to cool engine oil with cold sea water. Checalc chemical engineering calculations to assist process, plant operation and maintenance engineers. An initial design of chimney heat recovery heat exchanger was provided. To heat a cooler fluid by means of a hotter fluid 2. Two types of flow arrangement are possible in a double pipe heat exchanger. Double pipe heat exchanger, double pipe heat exchanger. The author concluded that the double pipe heat exchanger design would consume a power of 51,000 kwhyear, which is lesser than that consumed by the typical existing system. Chapter 5 heat exchangers faculty of engineering and. Products double pipe heat exchangers heat transfer. In addition, we will examine various aspects of heat exchanger design and analysis. Mar 11, 20 equations for calculating the overall heat transfer coefficient for a double pipe heat exchanger with no phase changes. Shell and tube heat exchanger design software for thermal. The most widely used double pipe heat exchanger is the hair pin.
How to model a double pipe heat exchanger2 youtube. Experimental investigation of doublepipe heat exchangers. Double pipe heat exchanger design consists of one pipe placed inside another pipe of a larger diameter with appropriate fittings to guide the flow from section to another. Preliminary analytical design double pipe heat exchanger reference calculation examples 1, 2, 11, 12 and 16 are used from the butterworth text. Low cost engineering calculations software available for convection heat transfer coefficients, pipe flowfriction factor calculations, partially full pipe flow calculations, watershed time of concentration, rational method, orifice and venturi meter flow rate calculations, open channel flow measurement, activated sludge wastewater. In this paper the optimal design of the exchanger has been formulated as a geometric programming with a single degree of difficulty.
Download the excel spreadsheet templates in this article to make preliminary heat exchanger design calculations. 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. Heat exchanger theory leads to the basic heat exchanger design equation. This system was specifically designed for boiler chimney and therefore the systems. The high stresses produced by differential thermal expansion between outer and inner pipes are more easily handled. Fluid engine oil sea water inlet temperature, c 65 20 outlet temperature, c 55 25 heat. For lightly higher heat duties, helical coil heat exchanger is used. 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. 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. The design had a completely fabricated exchange core but an incomplete ducting system. In heat exchanger, is the appropriate average temperature difference to use in heat transfer calculations. Double pipe heat exchanger calculation does the thermal and hydraulic design of double pipe heat exchangers and estimate number of hairpin required. 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 double pipe construction.
This example studies the cooling of hot oil c by a cool oil 60c entering in countercurrent. Fired heaters the selection of a heat exchanger depends on many factors including capital and. 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. Calculate logarthmic mean temperature difference lmtd. Although double pipe heat exchangers are the simplest to design, the better choice in the following cases would be the helicalcoil heat exchanger hche. The goals of this proje ct were to design a plate heat exchanger apparatus and evaluate the potential of replacing the current double pipe heat exchanger by this newly designed plate heat exchanger for the unit operation laboratory course. Double pipe i regeneraljve classification according to. Double pipe heat exchangers are used for low product streams and low heat duties. The pressure drop for the tube side is often predicted using the following formula.
The image shows only the beginning of the calculations. Software for thermal and hydraulic design of heat exchangers. Karl ponweiser institute for thermodynamics and energy conversion vienna university of technology vienna, austria published by wseas press. Pdhonline course m371 2 pdh shell and tube heat exchangers. The double pipe heat exchanger is one of the simplest types of heat exchangers. The heat transfer plates are made in stainless steel and are brazed with copper as standard. Design and demonstration of a heat exchanger for a compact. The doublepipe heat exchanger is one of the simplest types of heat exchangers. They will also calculate the number of tubes needed for a shell and tube heat exchanger and to calculate the pipe length needed for a double pipe heat exchanger. For an existing heat exchanger the geometry, flows and. This report is based on the work undertaken to complete and test the gas to gas heat recovery system. Convective heat transfer from the outer tube wall to the outside fluid. Creation of excel sheet and plugging in of all available data. Double pipe heat exchanger design with counterflow or.
Manifolding of a multiple hairpin setup is easily accommodated. Heat exchangers 73 individual thermal resistances of the system. This paper investigates the design optimization of double pipe heat exchanger using mathematical programming. Design and analysis of a newly installed plate heat. The software will do all the thermal calculations involved in the design and will generate a summary of all results. For use with aggressive media, nickel braze can also be used. The design incorporated heat pipes as a means to improve the efficiency of the overall heat transfer. Copper brazed plate heat exchangers are pressure resistant up to 30 bar. A procedures manual was created for the doublepipe heat exchanger. Gnielinski correlation for the heat transfer coefficient of the shell side and tube side fluids hh and hc. Calculation for double pipe exchanger, air cooled exchanger, lmtd calculation, lmtd correction factors, insulation heat loss and jacketed vessel heat transfer.
Calculate the required heat transfer area based on values needed. Double pipe heat exchanger design step by step software. Cadfem ansys extension for the design and validation of cooling systems and thermal engineering plants free booking vdi heat atlas is the recognized standard work for the design of technical apparatus and plants in process and energy technology. Double pipe heat exchanger design free download as pdf file.
Horizontal double pipe heat exchanger uses various inserts inside tube so as to enhance heat transfer and. Double pipe heat exchager design code heat transfer. Combining each of these resistances in series gives. The heat exchanger is found in large construction to support cooling process such as fossil fuel power plant. Yau developed an empirical model for the hvac system of an operating theatre to test the design of a double pipe heat exchanger in the air handler unit. A heat exchanger thermal design calculations spreadsheet.
Overall heat transfer coefficient for doublepipe heat. Only recuperators, or heat exchangers where two fluids are separated by the heat transfer surface that normally has no moving parts, are covered. Hemmat of mechanical engineering, shahid bahonar university of kernlan, iran abstract the single phase flow and thermal performance of a double pipe heat. Overall heat transfer coefficient for double pipe heat exchanger calibrate thermocouples pump water through inner pipe of double pipe heat exchanger rate determined by rotameter flow steam through outer pipe of double pipe heat exchanger measure rate by pail and scale. The design and construction of the brazed plate heat exchangers are particularly compact and effi cient. So, already we have talked about the double pipe heat exchanger in one of our earlier lecture classes. Double pipe heat exchanger design dhex is a software tool that is made to demonstrate the chemical design calculations of double pipe hairpin heat. Heat exchanger size is the critical criteria due to availability various heat transfer augmentation techniques.
Heat exchanger is one of the important devices in cooling and heating process in factories, buildings, transports and others. A double pipe heat exchanger consists of one pipe inside another. The software will do all the thermal calculations involved in the design and will generate a summary of. The entire analysis has been done by selecting an existing design of a double pipe heat exchanger with specified flow conditions at the inlet to the heat exchanger. Emphasis is on thermohydraulic design of the heat exchanger. This project work is based on design and thermal analysis of double pipe heat exchanger. Optimum design of double pipe heat exchanger sciencedirect. Design a double pipe heat exchanger with bare inner multitubes that. Tech 1 pg scholar, department of thermal, mlr institute of technology, ranga reddy, telangana, india. Application of double pipe heat exchanger is in high temperature and high pressure. The fluid flows in the inner pipe is the tube side and in exchange another fluid flows in the outer pipe annulus. Equations for calculating the overall heat transfer coefficient for a double pipe heat exchanger with no phase changes.
The calculation of the heat transfer coefficients is explained with examples. Fluid engine oil sea water inlet temperature, c 65 20 outlet temperature, c 55 25 heat load, kw 117. Low cost engineering calculations software available for convection heat transfer coefficients, pipe flowfriction factor calculations, partially full pipe flow calculations, watershed time of concentration, rational method, orifice and venturi meter flow rate calculations, open channel flow measurement, activated sludge. The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. Optimal design of double pipe heat exchanger structures. They have a particular advantage when close temperature approaches are needed or in high pressure applications. Make an initial estimate of the overall heat transfer coefficient, u, based on. Dec 21, 2014 download free excel spreadsheets for engineering calculations.
Mar, 20 calculates the length of a concentric counterflow heat exchanger using the same parameters as in sizing a heat exchanger. Double pipe heat exchanger design software hairpin heat. At the beginning of the calculation must be decided the. Jc equipments pvt ltd used top rated softwares to design and best quality design engineers to design your double pipe heat exchanger. One fluid flows in the inner pipe, while a second fluid flows in the outer pipe annuals. This excel spreadsheet helps you design a double pipe heat exchanger also known as a concentric tube heat exchanger. Pdf on jan 1, 2018, mate petrik and others published optimal design of. In parallel flow, both the hot and cold fluids enter the heat exchanger at the same end and move in the same direction, as shown in figure 1. Process fluid assignments to shell side or tube side. Make an initial estimate of the overall heat transfer coefficient, u, based on the fluids involved. Aug 10, 2011 a heat exchanger thermal design calculations spreadsheet.
Nowadays, heat exchanger becomes the prominent application for sensible cooling and sensible heating applications. Pdf the double pipe heat exchanger is one heat exchanger pipe inside another larger pipe. Heat exchanger calculations and design with excel spreadsheet. Calculate the required heat transfer rate, q, in btuhr from specified information about fluid flow rates and temperatures. Principles of finnedtube heat exchanger design for enhanced heat transfer 2nd edition by dipl. Experimental investigation of doublepipe heat exchangers in. We are using most excellent softwares for support of complicated calculations while design of double pipe heat exchanger. It can be operated as a parallel flow or as a counterflow heat exchanger. That is, the design of a two fluid heat exchanger used for the. This excel spreadsheet helps you design a double pipe heat exchanger also known as a. The overall heat transfer characteristics of a double pipe. A practical guide for planning, selecting and designing of shell and tube exchangers takes users on a stepbystep guide to the design of heat exchangers in daily practice, showing how to determine the effective driving temperature difference for heat transfer. Double pipe heat exchanger design security and download notice download.
The heat exchange duty a llows calculation of the log mean. Base your calculation on the outside area of the inside pipe. The main advantage of the hche, like that for the spiral heat exchanger she, is its highly efficient use of space, especially when its limited and not enough straight pipe can be laid. Hence for the given design and length of the heat exchanger heat transfer enhancement in a double pipe heat exchanger is possibly achieved by several methods. Download free excel spreadsheets for engineering calculations. 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. Unlike other tools, ensures that the calculations are performed step by step to help in understanding the design calculations. Double pipe heat exchanger design free download and. Heat transferheat exchangers blogs engineering excel templates. The optimum thermal design of a shell and tube heat exchanger involves the consideration of many interacting design parameters which can be summarized as follows. Design of small heat exchanger double pipe type mohamad shafiq bin alias thesis submitted in fulfillment of the requirements for the award of the degree of. For this research, the hot air from engine bay is cooling down by using. Double pipe heat exchanger design heat exchanger viscosity.
Setting shell side and tube side pressure drop design limits. Doublepipe 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 overall heat transfer coefficient, u, is an approximate value. 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. Calculate the heat transfer area of the double pipe heat exchanger in the lab.
The overall heat transfer characteristics of a double pipe heat exchanger. 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. Double pipe heat exchanger design free to try webbusterz engineering software windows 98me2000xpvista7 version 2. Chemical engineering calculations to assist process, plant operation and maintenance engineers. Double pipe heat exchanger design requires use of the heat transfer rate, the log mean temperature difference, and an estimate of the overall heat transfer coefficient to calculate the estimated heat transfer surface area. 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 design of double pipe heat exchanger kirti zare.