Hydration of magnesium carbonate in a thermal energy storage process and its heating application design

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Sammanfattning

First ideas of an application design using magnesium (hydro) carbonates mixed with silica gel for day/night and seasonal thermal energy storage are presented. The application implies using solar (or another) heat source for heating up the thermal energy storage (dehydration) unit during daytime or summertime, of which energy can be discharged during night-time or winter and used to increase the temperature of the heat source side of a heat pump, increasing the COP. The application can be used in small houses, or at the user end of district heating systems. Experimental data are presented, determining and analysing kinetics and operating temperatures for the applications. In this paper the focus is on the hydration part of the process, which is the more challenging part, considering conversion and kinetics. The excess water is stored in a tank separate from the solid material storage reactor, from where the hydration water vapour is evaporated. Various operating temperatures for both the reactor and the water tank are tested and the favourable temperatures are presented and discussed. The thermal energy storage system with mixed nesquehonite (NQ) and silica gel (SG) can use both low (25-50%) and high (75%) relative humidity (RH) for hydration. The hydration at 40% RH gives a thermal storage capacity of 0.32 MJ/kg and at 75% RH gives a capacity of 0.48 MJ/kg.

OriginalspråkOdefinierat/okänt
Titel på gästpublikation30th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, July 2-6, San Diego, California : ECOS 2017
RedaktörerAsfaw Beyene
FörlagSan Diego State University
Sidor1727–1739
StatusPublicerad - 2017
MoE-publikationstypA4 Artikel i en konferenspublikation
EvenemangInternational Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems - 30th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS-2017
Varaktighet: 2 jul 20176 jul 2017

Konferens

KonferensInternational Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Period02/07/1706/07/17

Nyckelord

  • Magnesium (hydro)carbonate
  • energy storage

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