Heat Exchanger Sizing Software ScreenshotEPCON Heat Exchanger Sizing™ Software application, Powered by Process Innovator™, accurately sizes industrial shell and tube heat exchangers to meet desired heat transfer requirements.

Introduction

Heat transfer between two materials requires one material to be at a different temperature than the other. This temperature differential is the driving force behind heat transfer. When transferring heat between materials through a barrier (metal tube, etc.) the rate of heat transfer is affected by the thermal conductivity of the barrier. The barrier includes the vessel or tube wall and stagnant fluid films at the surface of the wall. When two fluids are flowing on either sides of this barrier, the surface area required to transfer the required quantity of heat is defined by the rate at which this barrier will transmit heat. These relationships are summarized in the heat transfer equation: Q = U A dT where Q, the rate of heat transfer, is expressed in terms of the overall heat transfer coefficient (U), the heat transfer area (A), and the temperature difference (dT).

The Shell and Tube heat exchangers are sized based on performance, pressure drop, and dimensional constraints. It can be used for any combination of liquid, gas, condensing, or boiling on either the shell or tube side (except phase change on both the sides and superheating or sub-cooling of either fluid). Accurate sizing can be done without supplying the thermal conductivity or heat transfer coefficient data. The program provides an easy way to size a custom heat exchanger to meet your specific needs (so that it can be more accurately specified to exchanger vendors for their sizing and process guarantee) or for rating existing heat exchangers for a new service.

Empirical equations for film heat transfer coefficients are combined with heat balance equations and equations defining exchanger mechanical characteristics. The number of tubes in the heat exchanger are then increased until this combination of equations represents a valid heat exchanger design based on the available temperature driving force. This method allows you to perform heat exchanger sizing without knowing the heat transfer coefficient. All that is required are the incoming flows and fluid physical properties. For sensible heat transfer, the user must provide the flow rate of the secondary stream so that its temperature drop can be determined. Existing exchangers can be analyzed by entering the physical data, required flows, required heat transfer, and the existing heat exchanger physical specifications. If the number of tubes calculated by the program is less than the actual number of tubes available then the heat exchanger should meet the required demand. The amount of excess capacity can be estimated by increasing the flow rates until the calculated number of tubes equals the corresponding actual value.

Heat Exchanger Sizing Software Screenshot

Physical and Mechanical Data

Enter the required physical and mechanical data in the input data fields provided. The Properties button allows the user to import the file containing the properties of the fluid present on the primary side selected in the Option menu. The properties have to be determined in the property window accessible from the Smartdraw screen and then saved in a file before closing that window. Clicking on the column for the desired fluid (either shellside or tubeside) will also direct the properties to be imported into that column. Repeat this process for the other side of the exchanger (two property files required). Alternatively, the user may manually enter the properties in the respective input fields. Clicking the Calculate button initiates the computation and brings up the Heat Exchanger Capacity window (next section). The Convert button will load the Conversion Calculator, and the Specify button will transfer all pertinent sizing data directly to the Specification Writer.

Heat Exchanger Capacity Window

Heat Exchanger Sizing Software Screenshot

In this window, enter the outlet conditions of the primary stream as the target values for the program. The program will also prompt the user for the flow rate or the latent heat to determine the total heat to be transferred by the heat exchanger. If the “Data Out of Range” error occurs, check to verify that enough energy is available in the secondary stream to provide the necessary heat transfer. The iterative indicator will appear after selecting the Proceed button. When the indicator equals 1.0, the correct number of tubes has been determined. If this value doesn't appear to be approaching 1.0 fairly quickly, it is likely that the limitations are too great on the exchanger to accomplish the required transfer in a reasonably sized heat exchanger. Select the Exit button to return to the data input/output screen so that the input can be modified (data will remain as entered).

Boiling Liquid Window

When the Boiling Liquid option is selected from the Option menu, the window shown above appears when a computation is initiated. Enter the required data and select the boiling surface material (for boiling liquid option only) before clicking the Proceed button.

Copyright © 1981-2014. EPCON International, Inc. All rights reserved.
Privacy Statement | Security Statement | Site Map | Feedback + | Report Piracy
EPCON Software™ is a process engineering software and technology provider. The company, product and service names used in this web site are for identification purposes only and do not represent any type of recommendation to purchase a product or service. API®, GPA®, DDBST®, DIPPr®, AIChE®, Vaaler Award®, Chemical Processing®, Signet Research®, Plant Engineering® Product of the Year and IETC® are registered trademarks in the United States and in other countries and are used with permission. EPCON Software™ and the software products EPCON SiNET™, EPCON ToolBoXpress™, EPCON Multi-Phase Flash™, EPCON Cost Plus™, EPCON CHEMPRO™, Engineer's Aide™, EPCON DIPPRO™, SYSTEM 7 Process Explorer™, Process Innovator™, EPCON PRV Analyzer™ and EPCON Unit Conversions™ are trademarks of EPCON International, Inc. in the United States and other countries. All other trademarks or registered trademarks are the property of their respective owners. Both EI EPCON International Inc. and EPCON Software™ and all its products, services and other trademarks are not affiliated with EPCON Industrial Systems LP or any other company using the word “EPCON” in their trademark in any way. All rights reserved.