Solar heat storage using chemical reactions

Ervin, G.

doi:10.1016/0022-4596(77)90188-8

Cited by 232 publications

(125 citation statements)

References 5 publications

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“…Reversible hydroxide reactions based on calcium hydroxide/calcium oxide and magnesium hydroxide/magnesium oxide for TCES application were already studied by Ervin [3] in 1977. In [4], the advantages and disadvantages of the two investigated hydroxides are described.…”

Section: Introductionmentioning

confidence: 99%

Methodology to determine the apparent specific heat capacity of metal hydroxides for thermochemical energy storage

Lager

Hohenauer

Knöll

et al. 2017

J Therm Anal Calorim

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Thermochemical energy storage uses reversible thermochemical reactions to store and release heat, representing a promising technology for energy conservation and utilizing fluctuating renewable energy sources and waste heat. Many recent studies have focused on determination of the enthalpy of reaction of possible thermochemical materials (TCM) based on thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). So far, comparatively few attempts have been made to characterize the apparent specific heat capacity at constant pressure c app p T ð Þ of the investigated TCM. The purpose of this study is to outline a measurement and analysis procedure to evaluate c app pThe procedure is presented focusing on two metal hydroxides Ca(OH) 2 and Mg(OH) 2 . Preliminary TGA experiments were conducted to identify reaction-free temperature intervals and mass change. Starting from the metal hydroxide, subsequent DSC experiments with two consecutive heating and cooling cycles were carried out to determine c

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Section: Introductionmentioning

confidence: 99%

Methodology to determine the apparent specific heat capacity of metal hydroxides for thermochemical energy storage

Lager

Hohenauer

Knöll

et al. 2017

J Therm Anal Calorim

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“…The concentrated solar radiation can also be stored by means of chemicals bonds. Some salts as sulfates, carbonates, hydroxides and ammonia salts are reversible reactions were thermal energy can be stored (Prengle and Sun, 1976;Wentworth and Chen, 1976;Ervin, 1977;Romero-Paredes et al, 2006). Naturally the ideal row material to produce hydrogen is water, due to its abundance, low value and the absence of CO 2 emissions during its dissociation.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Numerical Analysis of a Thermochemical Solar Reactor

Vázquez–Rodríguez¹,

Varela-Ham²,

Avalos-Zuniga³

et al. 2014

Energy Research Journal

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In this study a 2D transient temperature distribution in a onedimensional thermochemical solar reactor of gas-particles is presented. The gas-particles medium is contained in a reactor where an endothermic chemical reaction of some oxide-metal at high temperature is expected to be occurred. The reactor receives the concentrated solar power on the reactor walls, or directly to the gas-particles medium. As expected the temperature distribution in the reactor is quite homogeneous when it operates to close steady state conditions, but also due to the fact that the inlet cold gas is reheated with the exit warm gas. However, when the reactor starts to operate, the temperature distribution is non-homogeneous depending on how the reactor receives the concentrated solar power.

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“…Magnesium oxide has possibility for thermal utilization also as an inorganic oxide (Ervin, 1977). A chemical heat pump using a reversible magnesium oxide/water reaction system has been examined to promote thermal energy utilization (Bauerle and Chung, 1980;Bhatti and Dollimore, 1984).…”

Section: Introductionmentioning

confidence: 99%

Durable Reaction Material Development for Magnesium Oxide/Water Chemical Heat Pump

Kato

Saito

Soga

et al. 2007

J. Chem. Eng. Japan

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Durable reaction material for repetitive reaction operation of a chemical heat pump that used a reversible magnesium oxide/water reaction system was discussed to enhance the heat pump performance. Because a material for the heat pump use was required to fit multi-production process, a molding method was introduced for material preparation. Some molded samples under different preparation conditions were evaluated kinetically by a thermo-balance analysis. Magnesium hydroxide prepared from ultra fine particle magnesium oxide and purified water showed enough reactivity, and also stable durability to 70 of repetitive reaction cycles. Removal of impurity was effective for durability enhancement of magnesium hydroxide made from seawater precipitated precursor. The cost of the precipitated hydroxide was less than one several tenths of the ultra fine particle material. It was demonstrated that the molded reactant made from precipitated hydroxide was applicable for multi production and cost reduction of magnesium hydroxide material for the heat pump. The thermal performance of magnesium oxide/water chemical heat pump was evaluated from experimental results.

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Solar heat storage using chemical reactions

Cited by 232 publications

References 5 publications

Methodology to determine the apparent specific heat capacity of metal hydroxides for thermochemical energy storage

Methodology to determine the apparent specific heat capacity of metal hydroxides for thermochemical energy storage

Heat Transfer Numerical Analysis of a Thermochemical Solar Reactor

Durable Reaction Material Development for Magnesium Oxide/Water Chemical Heat Pump

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