Overview of Heat Exchanger Design Methodology

2007 ◽  
pp. 78-96
Keyword(s):  
Heat Exchanger ◽  
Design Methodology ◽  
Heat Exchanger Design

Optimization and Standardization of Flanged and Flued Expansion Joint Design

2019 ◽  
Vol 141 (3) ◽  
Author(s):  
Kamlesh M. Chikhaliya ◽  
Bhaveshkumar P. Patel
Keyword(s):  
Heat Exchanger ◽  
Optimum Design ◽  
Design Methodology ◽  
Thick Wall ◽  
Process Conditions ◽  
Expansion Joint ◽  
Standard Requirement ◽  
Spring Rate ◽  
Tube Heat Exchanger ◽  
Heat Exchanger Design

Flanged and flued type expansion joint (thick wall expansion bellow) used as an integral part of many shell and tube heat exchanger where process conditions produce differential expansion between shell and tubes. It provides flexibility for thermal expansion and also functions as a pressure retaining part. Design of expansion joints is usually based on trial and error method in which initial geometry must be assumed, and accordingly maximum stresses and spring rate are be calculated. Inadequate selection of geometry leads to higher tubesheet and bellow thickness, which increases cost of equipment. This paper presents standardization and optimum design approach of flange and flued expansion bellow fulfilling ASME VIII-1 and TEMA standard requirement. Methodology to define expansion bellow geometry is developed, and geometry dimensions are tabulated for expansion bellow diameter from 300 to 2000 mm and thickness from 6 to 30 mm. Each defined geometry is analyzed using finite element method, and maximum von Mises stresses are calculated for bellow axial displacement from 0.5 to 1.5 mm and internal pressure from 0.1 to 6.5 MPa. Spring rate is also calculated for each defined geometry for consideration in tubesheet calculation. Accordingly, optimum design methodology is developed, tested, and compared with existing design. Results depicted that proposed standardization approach and design methodology will optimize expansion bellow and tubesheet thickness and will also save considerable time in finalization of heat exchanger design.

Earth-Air and Earth-Water Heat Exchanger Design for Ventilation Systems in Buildings

2010 ◽  
Author(s):  
Michel De Paepe ◽  
Christophe T’Joen ◽  
Arnold Janssens ◽  
Marijke Steeman
Keyword(s):  
Heat Exchanger ◽  
Heat Exchangers ◽  
Design Methodology ◽  
Energy Use ◽  
Polyethylene Tube ◽  
Dynamic Simulations ◽  
Tube Heat Exchanger ◽  
Heat Exchanger Design ◽  
The Earth ◽  
Software Codes

Earth-air heat exchangers are often used for (pre)heating or (pre)cooling of ventilation air in low energy or passive house standard buildings. Several studies have been published in the passed about the performance of these earth-air heat exchangers [1–8]. Often this is done in relation to the building energy use. Several software codes are available with which the behaviour of the earth-air heat exchanger can be simulated. De Paepe and Janssens published a simplified design methodology for earth-air heat exchangers, based on thermal to hydraulic performance optimisation [7]. Through dynamic simulations and measurements it was shown that the methodology is quite conservative [9–10]. Hollmu¨ller added an earth-air heat exchanger model to TRNSYS [11]. In stead of using earth-air heat exchangers, earth-water heat exchangers are now getting more attention. In this system the ventilation air is indirectly cooled/heated with the water flow in a fin-tube heat exchanger in the inlet of the ventilation channel. The water-glycol mixture transfers heat with the earth by flowing through e.g. a polyethylene tube. In the second part of this paper a design methodology is first derived and then applied to this type of system.

Heat Exchanger Design Methodology for Electronic Heat Sinks

2006 ◽  
Vol 129 (7) ◽  
pp. 899-901 ◽  
Author(s):  
Ralph L. Webb
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Temperature Difference ◽  
Transfer Rate ◽  
Design Methodology ◽  
Design Method ◽  
Heat Sinks ◽  
Inlet Temperature ◽  
Heat Exchanger Design ◽  
Electronic Heat

This paper discusses the “inlet temperature difference” (ITD) based heat-exchanger (and its variants) design methodology frequently used by designers of electronic heat sinks. This is at variance with the accepted methodology recommended in standard heat-exchanger textbooks—the “log-mean temperature difference,” or the equivalent ε-NTU design method. The purpose of this paper is to evaluate and discuss the ITD based design methodology. The paper shows that the ITD based method is an approximation at best. Variants of the method can lead to either under- or overprediction of the heat transfer rate. Its shortcomings are evaluated and designers are directed to the well established and accepted design methodology.

Frequently Overlooked Heat Exchanger Design Conditions

2013 ◽  
Author(s):  
Andrey Gutkovsky ◽  
Jaan Taagepera
Keyword(s):  
Heat Exchanger ◽  
Loading Condition ◽  
Design Methodology ◽  
Bending Stress ◽  
Allowable Stress ◽  
Element Analysis ◽  
Design Rules ◽  
Channel Geometry ◽  
Heat Exchanger Design ◽  
Current Design

This paper explores the current design methodology for heat exchanger channel pass partition plates using ASME and TEMA design rules. Unanticipated elevated stress levels above allowable stress may exist at the channel pressure boundary due to differential pressure. In performing finite element analysis on two-pass heat exchanger channel geometry, elevated bending stress magnitudes were identified on the channel pressure boundary in the vicinity of the pass partition plate. These elevated stresses are induced by the pressure drop across channel passes, which load the pass partition plate and subject the channel pressure boundary to a bending stress which is frequently not evaluated. The combined membrane and bending stress may exceed allowable limits. This paper is intended to highlight this potentially overlooked loading condition in the design of heat exchanger channels.

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