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research-article

Thermal Cycling of Calcium Chloride Hexahydrate with Strontium Chloride as a Phase Change Material for Latent Heat Thermal Energy Storage Applications in a Non-DSC Set-Up.

[+] Author and Article Information
Navin Kumar

1501 Copperfield Pkwy Apt 1227 College Station, TX 77845-4689 navin.subram@gmail.com

Debjyoti Banerjee

Mechanical Engineering Department Mail Stop 3123 TAMU College Station, TX 77843-3123 dbanerjee@tamu.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Thermal Science and Engineering Applications. Manuscript received October 20, 2018; final manuscript received February 2, 2019; published online xx xx, xxxx. Assoc. Editor: Steve Q. Cai.

ASME doi:10.1115/1.4042859 History: Received October 20, 2018; Accepted February 04, 2019

Abstract

Calcium chloride hexahydrate (CaCl2.6H2O) is an attractive candidate as a PCM for supplemental cooling in air-cooled thermal power-plant since it has a low melting point of 30°C and relatively large volumetric energy storage density 289 MJ/m3. The volumetric energy storage density is approximately double the energy densities of comparable paraffins with similar melting points. However, calcium chloride hexahydrate often requires high degree of supercooling to initiate solidification and long-term thermal stability has impeded the adoption of calcium chloride hexahydrate in LHTESS. There are only a few literatures which reports on long-term stability of pure calcium chloride hexahydrate accurately. In this paper, we studied the effects of sodium chloride and strontium chloride in mitigating supercooling in calcium chloride hexahydrate over 300 and 1000 melt-freeze cycles and thermal stability at elevated temperatures. Secondly, this study also aims to measure the reliability of calcium chloride hexahydrate and report it, in terms of variations in melting temperature, supercooling, energy storage density, and change in mass over 1000 melt-freeze cycles. Since there is not much data available on calcium chloride hexahydrate with nucleating additives and the current data's available does not provide an insight on the effects of thermal cycling on supercooling.

Copyright © 2019 by ASME
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