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Principles Of Enhanced Heat Transfer

Process intensification for post-combustion CO2 capture with chemical absorption: A critical review

Numerical investigation on thermal–hydraulic performance of new printed circuit heat exchanger model ☆

The need for energy-efficient and environmentally friendly refrigeration, heat pumping, air conditioning, and thermal energy harvesting systems is currently more urgent than ever. Magnetocaloric energy conversion is among the best available alternatives for achieving these technological goals and has been the subject of substantial basic and applied research over the last two decades. The subject is strongly interdisciplinary, requiring proper understanding and efficient integration of knowledge in different specialized fields. This review article presents a historical and up-to-date account of the energy-related applications of magnetocaloric materials and information about their processing and magnetic fields, thermodynamics, heat transfer, and other relevant characteristics. The article also discusses the conceptual design of magnetocaloric refrigeration and power generation systems and some guidelines for future research in the field.

https://onlinelibrary.wiley.com/doi/epdf/10.1002/aenm.201903741

Energy Applications of Magnetocaloric Materials

Heat transfer and pressure drop correlations of microchannel heat exchangers with S-shaped and zigzag fins for carbon dioxide cycles

Selected Contents. Chapter 1 Introduction. Chapter 2 Industrial Compact Exchangers. Chapter 3 The Heat Exchanger as Part of a System: Exergetic (Second Law) Analysis. Chapter 4 Surface Comparisons, Size, Shape and Weight Relationships. Chapter 5 Surface Types and Correlations. Chapter 6 Thermal Design. Chapter 7 Compact Heat Exchangers In Practice. Appendices.

Compact Heat Exchangers: Selection, Design and Operation

This chapter discusses a number of factors ultimately affecting the long-term satisfactory operation of compact heat exchangers. Following the selection of the type of heat exchanger, guidance is given to those involved in the operation and maintenance of the unit. Fouling and, to a lesser extent, corrosion, and their minimisation, remain key priorities during the life of many heat exchangers, particularly those in arduous process industry duties. Specific types of fouling are described and design approaches to reduce fouling are presented. As process plants become more compact—process intensification—the need to handle solids becomes more demanding, and new efforts to address this are briefly presented.

Compact heat exchangers in practice

This chapter discusses a number of factors affecting the long-term satisfactory operation of compact heat exchangers. Fouling, and to a lesser extent corrosion, and their minimization are key priorities during the life of many heat exchangers, particularly those in arduous process industry duties, and these aspects should never be neglected during the life of the unit. This chapter focuses on process applications, although some of the principles are relevant to all applications of compact heat exchangers. The factors to be considered, including those necessarily affecting system design are installation; commissioning; operation; maintenance; and fouling factors. Installation is frequently carried out while other activities are under way in the locality. The operation of compact heat exchangers requires a degree of control over conditions that tends to be greater than that exercised with conventional shell and tube heat exchangers. The thermal effect of fouling on performance is normally expressed as an extra resistance, or fouling factor, which is the inverse of a heat transfer coefficient.

Chapter 7 – COMPACT HEAT EXCHANGERS IN PRACTICE

In this Chapter, the basic physical features and construction of the principal industrial compact heat exchanger types are described. The definition of ‘compact’ in this respect is consciously chosen as a wide one, implying surface area densities upwards of about 200 m2/m3, representing hydraulic diameters lower than about 14 mm. Several new developments are described in the later descriptive sections. A distinction is made between heat exchangers and heat exchanger reactors, the latter being the subject of rapidly increasing industrial interest. An area that will have a major impact on heat exchanger design and manufacture is 3D printing (additive manufacturing), and examples are given in this Chapter.

Industrial Compact Exchangers

This chapter describes the principal surface types used in compact exchangers and corresponding correlations. In the consideration of specific surfaces and their “f” and “j” correlations, it should be noted that these correlations, being dimensionless, are independent of scale. This carries important implications, especially for any optimization process, that are not generally recognized. Thus the surfaces themselves can be scaled up or down, provided that each dimension is scaled in the same proportion, and that the material is available in the appropriate sizes. The distinction between the distributor and core heat transfer zones, however, is not clear because there is no section with constant flow area. Some highly structured pressed plate surfaces have corrugation structures similar to plate-fin heat exchanger plates, and their performance characteristics are therefore comparable. This allows achieving exact matching of pressure drop for both sides in counter flow exchangers for a given nominal surface designation, and in the process gives reduced size and weight.

John E. Hesselgreaves

Papers

Compact Heat Exchangers: Selection, Design and Operation

Compact heat exchangers in practice

Chapter 7 – COMPACT HEAT EXCHANGERS IN PRACTICE

Industrial Compact Exchangers

Chapter 5 – SURFACE TYPES AND CORRELATIONS