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Particle Size Optimization of Thermochemical Salt Hydrates for High Energy Density Thermal Storage

Journal Article · · Energy & Environmental Materials
DOI:https://doi.org/10.1002/eem2.12544· OSTI ID:1958931
 [1];  [2];  [2];  [1]
  1. Energy Technologies Area, Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
  2. Energy Technologies Area, Lawrence Berkeley National Laboratory Berkeley CA 94720 USA, Department of Mechanical Engineering UC Berkeley Berkeley CA 94720 USA

Thermal energy storage (TES) solutions offer opportunities to reduce energy consumption, greenhouse gas emissions, and cost. Specifically, they can help reduce the peak load and address the intermittency of renewable energy sources by time shifting the load, which are critical toward zero energy buildings. Thermochemical materials (TCMs) as a class of TES undergo a solid–gas reversible chemical reaction with water vapor to store and release energy with high storage capacities (600 kWh m −3 ) and negligible self‐discharge that makes them uniquely suited as compact, stand‐alone units for daily or seasonal storage. However, TCMs suffer from instabilities at the material (salt particles) and reactor level (packed beds of salt), resulting in poor multi‐cycle efficiency and high‐levelized cost of storage. In this study, a model is developed to predict the pulverization limit or R crit of various salt hydrates during thermal cycling. This is critical as it provides design rules to make mechanically stable TCM composites as well as enables the use of more energy‐efficient manufacturing process (solid‐state mixing) to make the composites. The model is experimentally validated on multiple TCM salt hydrates with different water content, and effect of R crit on hydration and dehydration kinetics is also investigated.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1958931
Alternate ID(s):
OSTI ID: 2234193
OSTI ID: 1983531
Journal Information:
Energy & Environmental Materials, Journal Name: Energy & Environmental Materials Journal Issue: 2 Vol. 7; ISSN 2575-0356
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
China
Language:
English

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