Charge and discharge behavior of elemental sulfur in isochoric high temperature thermal energy storage systems

Abstract

In this work, a Monte Carlo model is used to investigate electron induced secondary electron emission for varying effects of complex surfaces by using simple geometric constructs. Geometries used in the model include: vertical fibers for velvet-like surfaces, tapered pillars for carpet-like surfaces, and a cage-like configuration of interlaced horizontal and vertical fibers for nano-structured fuzz. The model accurately captures the secondary electron emission yield dependence on incidence angle. The model shows that unlike other structured surfaces previously studied, tungsten fuzz exhibits secondary electron emission yield that is independent of primary electron incidence angle, due to the prevalence of horizontallyoriented fibers in the fuzz geometry. This is confirmed with new data presented herein of the secondary electron emission yield of tungsten fuzz at incidence angles from 0-60°.

Sulfur-based thermal energy storage system using intermodal containment: Design and performance analysis

“…The assumption of radial uniformity in the tube wall for any given axial location is valid due to its relatively low conductive thermal resistance [34]. While the storage medium does not exhibit radial uniformity, the convective heat transfer correlation given by Nithyanandam et al [35] provides an accurate measure of the volume averaged temperature within the storage medium and is used here. The thermophysical properties of sulfur, steel, and air are taken to be the average value for the temperature range considered using data from [34,36] and are given in Table 1.…”

“…The interstitial heat transfer coefficients are obtained from two different sources. The tube-side heat transfer coefficient is a function of the tube-side Rayleigh number and is obtained via an experimentally validated CFD model, the details of which can be found in the works of Nithyanandam et al [35]. For systems utilizing shell and tube style heat exchangers -which have analogous shell-side geometry to that of STTB -several studies have employed Kern's method [39], the Bell-Delaware method [40], and Wills-Johnson method [41] in order to quantify the shellside heat transfer coefficient and pressure drop.…”

Study on the thermal kinetics of anthracite oxidation induced by water and associated pyrite

“…Sulfur is promising storage medium, which can be used for thermal energy storage at high temperature with a lower cost, and has good charge-discharge performance at high temperature (Jin et al 2020;Nithyanandam et al 2018). As for the in uence of pyrite on CSC, studies have found that pyrite has a great in uence on low temperature oxidation in humid environment (Arisoy and Beamish 2015; Arisoy et al 2017).…”