The effect of size on efficiency: Power plants and vascular designs

Bejan, Adrian; Lorente, Sylvie; Yilbaş, Bekir Sami; Sahin, Ahmet Z.

doi:10.1016/j.ijheatmasstransfer.2010.11.045

Cited by 39 publications

(23 citation statements)

References 9 publications

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“…This is because the power generation inside a turbomachinery is proportional to the volume (~r 3 ) while turbomachinery losses are proportional to the surface (~r 2 ). Similar discussion on this subject can be observed for the gas turbine case from the previous work [24].…”

Section: Performance Limits Of Small and Test Scale Seco 2 Cyclesupporting

confidence: 81%

Design consideration of supercritical CO2 power cycle integral experiment loop

Ahn

Lee

Kim

et al. 2015

Energy

100

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Section: Performance Limits Of Small and Test Scale Seco 2 Cyclesupporting

confidence: 81%

Design consideration of supercritical CO2 power cycle integral experiment loop

Ahn

Lee

Kim

et al. 2015

Energy

100

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“…The performance improves monotonically as the size increases. This result is in accord with theoretical advances on the effect of size on efficiency in thermofluid flow systems in general [17,19].…”

Section: Pressure Dropsupporting

confidence: 90%

Counterflow heat exchanger with core and plenums at both ends

Bejan

Alalaimi

Lorente

et al. 2016

International Journal of Heat and Mass Transfer

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a b s t r a c tThis paper illustrates the morphing of flow architecture toward greater performance in a counterflow heat exchanger. The architecture consists of two plenums with a core of counterflow channels between them. Each stream enters one plenum and then flows in a channel that travels the core and crosses the second plenum. The volume of the heat exchanger is fixed while the volume fraction occupied by each plenum is variable. Performance is driven by two objectives, simultaneously: low flow resistance and low thermal resistance. The analytical and numerical results show that the overall flow resistance is the lowest when the core is absent, and each plenum occupies half of the available volume and is oriented in counterflow with the other plenum. In this configuration, the thermal resistance also reaches its lowest value. These conclusions hold for fully developed laminar flow and turbulent flow through the core. The curve for effectiveness vs number of heat transfer units (N tu ) is steeper (when N tu < 1) than the classical curves for counterflow and crossflow.

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“…Clearly, studies in these fields also consider the methods of design, the numerical tools to investigate the performances of a heat exchanger, and also the times that such a tool requires for a reasonable design. Rohsenow et al [1], Kays and London [2], and Bejan and Lorente and Bejan et al [3,4] have largely investigated these issues. Yang et al [5], You et al [6], Caputo et al [7] have given valid examples of optimization and design techniques related to heat exchangers.…”

Section: • Mode Of Heat Transfer and Flow Regimementioning

confidence: 99%

Heat Exchangers in the Aviation Engineering

Carozza¹

2017

Heat Exchangers - Advanced Features and Applications

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Heat exchangers are crucial in thermal science and engineering because of their essential role across the landscape of technology, from geothermal and fossil power generation to refrigeration, desalination, and air conditioning. In the aviation engineering, they have a fundamental role especially in reducing the temperatures of the fuel and thus increasing the efficiency of the aircraft engines. The literature on aviation heat exchangers is voluminous and continues to be updated today. Two main aspects of this class of flow systems are widely investigated: fluid flow and heat transfer performances, and criteria for evaluating those performances. In addition, the need of a smart and light equipment to be used inside a transport system is ever and ever felt. This requires a particular attention in the selection of components, for example in the engine zone, not only to reduce the weight but also to improve the whole heat transfer efficiency. With this aim, engineers focus their attention on new materials, for example porous materials, that recently have attracted researchers. The design process may be considered the heart of engineering. In this chapter, we will explore methods for the design or the choice of heat exchangers and list some practical case studies.

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The effect of size on efficiency: Power plants and vascular designs

Cited by 39 publications

References 9 publications

Design consideration of supercritical CO2 power cycle integral experiment loop

Design consideration of supercritical CO2 power cycle integral experiment loop

Counterflow heat exchanger with core and plenums at both ends

Heat Exchangers in the Aviation Engineering

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