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首页> 外文会议>International Conference on the Domestic Use of Energy >Thermal Performance Analyses of Two Different Configurations of Combined Pebble-PCM Bed Thermal Storage System
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Thermal Performance Analyses of Two Different Configurations of Combined Pebble-PCM Bed Thermal Storage System

机译：Pebble-PCM组合床储热系统两种不同配置的热性能分析

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摘要

Thermal energy storage (TES) systems can be used to cater for the mismatch between the supply and demand of solar thermal energy. The addition of a layer of phase change material (PCM) to the bed of sensible heat storage material in a TES tank has been identified to increase its capacity ratio. Also, the addition of a layer of cheaper sensible heat storage materials to a bed of PCM in a TES tank will help to reduce its cost. Thermal performances of two different configurations of a ratio 1:1 combination of pebble-PCM in a combined TES (CTES) system during charging and subsequent discharging cycles are compared at three different charging flow-rates. CTES tank I is composed of rock pebbles occupying the upper 50% volume of the TES tank while encapsulated adipic acid occupy the bottom 50%. CTES tank II is composed of encapsulated adipic acid occupying the upper 50% volume of the tank while rock pebbles occupy the bottom 50%. The performances of the two configurations of the combined TES systems are analyzed during charging and discharging cycles from the perspectives of energy and exergy. CTES tank I show better performance in terms of both energy and exergy at the lowest flow-rate of 4 mls-1 during both charging and discharging. While CTES-II performed better at the higher flow rates of 8 mls-1 12 mls-1. However, CTES tank I show the best overall efficiencies (energy and exergy) at all HTF flow rates.
机译：可以使用热能存储（TES）系统来解决太阳能热能供需之间的不匹配问题。已经确定在TES储罐中的显热储能层中添加相变材料（PCM）层可以提高其容量比。此外，在TES储罐中的PCM床层上添加一层较便宜的显热储能材料将有助于降低其成本。在三种不同的充电流速下，对组合TES（CTES）系统中卵石-PCM比率1：1组合的两种不同配置在充电和后续放电循环期间的热性能进行了比较。 CTES储罐I由岩石卵石组成，占TES储罐的上部50％的体积，而封装的己二酸占底部50％的体积。 CTES II号储罐由胶囊化的己二酸组成，占据了罐的上部50％的体积，而卵石则占底部的50％。从能量和火用的角度分析了组合TES系统的两种配置的性能，包括在充电和放电循环期间的性能。 CTES储罐I在最低流量4毫升时在能量和火用方面均表现出更好的性能 -1 在充电和放电期间。虽然CTES-II在8毫升的更高流速下表现更好 -1 12毫升 -1 。但是，CTES储罐I在所有HTF流量下均显示出最佳的整体效率（能量和火用）。

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