Low-grade heat collection from a latent heat thermal energy storage unit

2016 15th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm) Pub Date : 2016-05-01 DOI:10.1109/ITHERM.2016.7517690

Zhen Qin, S. Dubey, F. Choo, H. Deng, F. Duan

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引用次数: 2

Abstract

Thermal energy storage is widely employed in waste heat recovery. Phase change materials (PCMs) are a type of promising thermal storage (TES) approach featuring high energy stored or released during melting and freezing. In this study, a latent heat storage system is designed to collect the waste heat from hot air while its efficiency is experimentally investigated. The system consists of five cuboid chambers to store PCMs and six air channels to deliver the exhausted gas. Paraffin wax is selected as the tested PCMs and differential scanning calorimetry (DSC) is applied to calibrate its melting range and latent heat. In the experiments, the effects of average air velocities and inlet air temperature on the performance of the latent heat storage unit are experimentally investigated. The experiments show that the designed TES unit can store maximally thermal energy for near 4510 kJ within 250 min, while the latent heat occupies 15 % at fan speed 25 RPM and the heater power with 2 kW. It is indicated that increasing of air mass flow rate and increasing of air inlet temperature can improve the heat transfer performance. It is found that the temperature profiles in the freezing process are smoother than those in the melting process.

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从潜热蓄热装置中收集低级热量

蓄热在余热回收中得到了广泛的应用。相变材料(PCMs)是一种很有前途的储热(TES)方法，其特点是在熔化和冻结过程中储存或释放高能量。本研究设计了一种潜热蓄热系统来收集热空气中的余热，并对其效率进行了实验研究。该系统由5个长方体室组成，用于储存pcm, 6个空气通道用于输送废气。选择石蜡作为被测PCMs，用差示扫描量热法(DSC)标定其熔化范围和潜热。在实验中，研究了平均风速和进风口温度对潜热蓄热装置性能的影响。实验结果表明，在风机转速为25 RPM、加热器功率为2 kW时，所设计的TES机组在250 min内最大能存储近4510 kJ的热能，潜热占15%。结果表明，增大空气质量流量和提高进气温度可以改善换热性能。结果表明，冻结过程的温度曲线比熔化过程的温度曲线平滑。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2016 15th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm)

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