In this study, the distributions of saving-investment ratio in heat exchangers have been obtained based on known technical and economical parameters and NTU (Number of Transfer Units) as d(TYO) = E/Eopt, where Eopt is investment saving potential ratio at optimum, E is local investment-saving potential ratio and dimensionless, which is suggested as “Teke Number” and it is derivatives of effectiveness according to NTU. Based on these charts, heat exchanger area can be determined for a given E value corresponding to the area at the tag end of the heat exchanger. When both of the fluid heat capacities are equal, effectiveness is undefinable. Counter low in a heat exchanger. Cross low heat exchanger. The basic concept of a heat exchanger is based on the premise that the loss of heat on the high temperature side is exactly the same as the heat gained in the low temperature side after the heat and mass flows through the heat exchanger. Parallel low in a heat exchanger. Figure 3. By continuing you agree to the use of cookies. Cold Side. Determining the best type of heat exchanger with the same saving-investment ratio at its tag ends. Eq.
By comparing the ε or NTU values of different type heat exchangers having the same E values, the best one is chosen.

Figure 1. E equations have also been obtained from the effectiveness relations with regards to NTU. We use cookies to help provide and enhance our service and tailor content and ads.

Copyright © 2014 Elsevier Ltd. All rights reserved. MMBTU/h. selection and sizing. Just answer a few short questions and get a customized recommendation to meet your unique needs. BTU/h.ft 2.°F. The following data must be defined in order to size a plate and frame heat exchanger : Fluid properties (viscosity, specific heat... if possible as a function of temperature) Heat Exchangers Type and Selection Outlines the different type of heat transfer equipment such as Shell-and-Tube heat exchangers, Plate-and-Frame or Compact heat exchangers and Air-cooled heat exchangers.

Determine the area of waste heat recovery heat exchangers with the lowest saving-investment ratio. Temperature Out °F. Temperature In °F. Contact Carotek to review your needs and heat exchanger options. by low arrangement and construction. Calculation procedure : plate heat exchanger sizing How to design a plate heat exchanger ? (4) ε = U A C min + U A If there is a phase change in a heat exchanger, the heat capacity of the fluid-changing phase becomes infinite, and Cr is zero, then effectiveness correlations reduce to (5) ε = 1 − exp (− NTU) regardless of the type of heat exchanger. Copyright © 2020 Elsevier B.V. or its licensors or contributors. Data Heat Duty. Heat exchanger sizing and selection requires a combination of knowledge of the heat exchanger types and options as well as knowledge of the application and environment where the unit operates.

A heat exchanger is a device for heat transfer from one medium to another.
Applying this method to any existing heat exchanger, the saving-investment ratio performance considering the area at the tag end of the heat exchanger can also be determined and compared with its optimum value having the same technical and economical parameters. We aim to provide some helfull design guidelines and tips to help engineers engaged in the thermal design and sizing of heat exchangers. 2.1 STEP 1 : get the design data.

Hot Side.

ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Sizing, selection, and comparison of heat exchangers considering the lowest saving-investment ratio corresponding to the area at the tag end of the heat exchanger. Or browse our selection of heat exchangers to find the best fit for your application. A new method has been developed to determine the area of waste heat recovery heat exchangers considering the lowest saving-investment ratio corresponding to the area at the tag end of the heat exchanger. The many types of heat exchangers can be characterized . U Value. Figure 2.

can be obtained applying the L'Hospital rule.

E functions are obtained and represented on ε-NTU charts for all type of heat exchangers. Shortcut Heat Exchanger Sizing Estimates LMTD (Log Mean Temperature Difference), Exchanger surface area, number of tubes, shell diameter and number of shell in series.

Alfa Laval HEXpert makes it quicker than ever to get the product and application knowledge you need to find your ideal heat exchanger.

The tool currently covers products for design pressures up to 100 bar and design temperatures up to 450° C. https://doi.org/10.1016/j.energy.2014.08.035. 2. heat exchanger that cools the heated water returning from the engine.

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