Experimental study of the characteristics of solidification of stearic acid in an annulus and its thermal conductivity enhancement

Liu, Zhongliang; Sun, Xuan; Ma, Chongfang

doi:10.1016/j.enconman.2004.05.011

Cited by 72 publications

(18 citation statements)

References 14 publications

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“…In spite of these desirable properties of paraffins, the low thermal conductivity (0.21-0.24 W/m K) is its major drawback decreasing the rates of heat stored and released during melting and crystallization processes which in turn limits their utility areas [8,[12][13][14]. To overcome the low thermal conductivity problem of paraffins as PCMs, studies have been carried out with the purpose of developing LHTES systems with unfinned and finned configurations [16][17][18][19], dispersing high conductivity particles [20] and inserting a metal matrix into paraffin wax [21]. However, uses of such type heat transfer promoters considerably increase the weight and volume of LHTES systems.…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity and latent heat thermal energy storage characteristics of paraffin/expanded graphite composite as phase change material

Sarı

Karaipekli

2007

Applied Thermal Engineering

802

211

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Section: Introductionmentioning

confidence: 99%

Thermal conductivity and latent heat thermal energy storage characteristics of paraffin/expanded graphite composite as phase change material

Sarı

Karaipekli

2007

Applied Thermal Engineering

802

211

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“…This can be done in several ways, including the use of fins or embedded high conductivity particles to improve the thermal response. A long spiral fin wrapped around the inner tube is used in a concentric tube heat exchanger by Liu et al [50]. The fin is shown to reduce the solidification time by up to 50 %.…”

Section: Heat Exchanger Designsmentioning

confidence: 98%

Energy Storage Applications

Fleischer

2015

Thermal Energy Storage Using Phase Change Materials

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As discussed in Chap. 1, energy storage through solid-liquid phase change is inherently a transient process and is best suited for systems that experience repeated transients, such as on-off or periodic peaking cycles, or for those systems which require thermal energy storage for later use. PCMs are commonly used in applications for both thermal management and for thermal energy storage.Interest in PCMs for thermal management of systems can be traced back at least through the 1970s. NASA in particular was interested in the use of PCMs as what were then referred to as "thermal capacitors" and PCMs were implemented in several moon vehicles and in Skylab [1]. The 1977 NASA tech brief "A Design Handbook for Phase Change Thermal Control and Energy Storage Devices" [2] was one of the first comprehensive PCM references, and is still widely cited and used today.During the 1970s and 1980s, interest was also building in the application of PCMs in solar systems [3-5] for thermal energy storage in both large solar plants, and in smaller domestic applications such as domestic hot water systems. The concept of embedding PCMs in various types of building materials, such as wallboard and floorboards, in order to create houses and offices with lower heating and cooling loads for greater energy efficiency, also began in the 1970s/80s [6,7]. Simultaneously, a significant amount of fundamental research was being completed on PCMs, considering in-depth the melting and solidification processes, and the roles of conduction and natural convection on the phase change processes [8][9][10][11].With the growth of computing power through the 1980s and 1990s, integrated circuits began dissipating significant amounts of heat and PCM applications in the thermal management of high performance, military and consumer electronics came on the scene in the late 1990s [12][13][14]. More recently, PCMs have seen application in textile design for energy absorbing clothing for military and consumer products [15].

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“…At high rate of mass flow, the solidified layers are observed on larger parts of the fins throughout the process. According to Liu et al [178], the use of fins increases not only the conduction heat transfer, but also natural convection, at earlier stages of solidification. When shell and tube or concentric double pipe heat exchanger are used, PCMs are stored in shell or annulus and the inner tube surface acts as heat transfer surface.…”

Section: Increasing Heat Transfer Surfacesmentioning

confidence: 99%

Waste Thermal Energy Harvesting (III): Storage with Phase Change Materials

Kong

Hng

et al. 2014

Waste Energy Harvesting

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In last two chapters, both methods to harvest waste thermal energy through the conversion to electricity. In this chapter, energy storage (ES) as an alternative method to harvest waste thermal energy, especially by using phase change materials (PCMs), will be presented.ES, as suggested by the name, is to store a certain form of energy, which thus be used later when necessary. A device that can be used to store any form of energy is generally called an accumulator. There are various forms of energy, commonly including kinetic energy, potential energy (e.g., gravitational or chemical), electrical energy, thermal energy, and so on. All these forms of energy could be stored by using an appropriate method [1,2]. For instance, mechanical energy can be stored by using hydrostorage, compressed air storage, and flywheels, while electrical energy is stored by using various batteries and supercapacitors. Thermal energy storage (TES) is the main content of this chapter.This chapter is arranged as follows. A brief description on various TES conceptions, together with a comparison, will be presented first. Among them, PCMs for TES will be emphasized. After that, PCMs with their classification according to their composition will be discussed. Design criteria, heat transfer phenomena, configuration of various PCM TES systems, which have been reported in open literature, will be summarized. Specific attention will be paid to the exergy analysis. The main applications of the PCM storage systems will be listed, analyzed, and compared. Strategies that have been used to improve the performance of such storage systems will be thoroughly evaluated. It will be ended with concluding remarks and perspectives of development of this technology.

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Experimental study of the characteristics of solidification of stearic acid in an annulus and its thermal conductivity enhancement

Cited by 72 publications

References 14 publications

Thermal conductivity and latent heat thermal energy storage characteristics of paraffin/expanded graphite composite as phase change material

Thermal conductivity and latent heat thermal energy storage characteristics of paraffin/expanded graphite composite as phase change material

Energy Storage Applications

Waste Thermal Energy Harvesting (III): Storage with Phase Change Materials

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