Abstract

In order to measure the thermophysical properties of ammoniated salt (CaCl2.mNH3: m = 4, 8) as an energy storage system utilizing natural resources, the measurement unit was developed, and the thermophysical properties (effective thermal conductivity and thermal diffusivity) of CaCl2.mNH3 and CaCl2.mNH3 with heat transfer media (Ti: titanium) were measured by the any heating method. The effective thermal conductivities of CaCl2.4NH3 + Ti and CaCl2.8NH3 + Ti were 0.14 - 0.17 and 0.18 - 0.20 W/(m.K) in the measuring temperature range of 290 - 350 K, respectively, and these values were approximately 1.5 - 2.2 times larger than those of CaCl2.4NH3 and CaCl2.8NH3. The effective thermal diffusivities were 0.22 - 0.24 × 10-6 and 0.18 - 0.19 × 10-6 m2/sin the measuring temperature range of 290 - 350 K, respectively, and these values were approximately 1.3 - 1.5 times larger than those of CaCl2.4NH3 and CaCl2.8NH3. The obtained results show that the thermophysical properties have a dependence on the bulk densities and specific heats of CaCl2.mNH3 and CaCl2.mNH3 + Ti. It reveals that the thermophysical properties in this measurement would be the valuable design factors to develop energy and H2 storage systems utilizing natural resources such as solar energy.

Highlights

  • These days, the possibility of significant global warming resulting from emissions of greenhouse gases by fossil fuel combustion has become an important concern within the international community

  • Some prototypes of thermal energy storage unit using CaCl2·mNH3 system have been designed and these performances [3]-[7] were measured, and because this chemical reaction is well known as higher energy density system as compared with those reactions for other energy storage systems [1] and NH3 is presently attracting an attention as a promising working fluid and NH3 has no relation to greenhouse effect on the earth

  • In order to develop the energy storage unit and H2 storage unit using CaCl2·mNH3 (m = 4, 8) + transfer media (Ti) system, the thermophysical properties as major design factors of energy and H2 storage units were measured by the any heating method

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Summary

Introduction

These days, the possibility of significant global warming resulting from emissions of greenhouse gases by fossil fuel combustion has become an important concern within the international community. Yamamoto and utilize the renewable energy as natural resources, The thermal energy storage systems utilizing the low temperature heat sources such as solar energy Some prototypes of thermal energy storage unit using CaCl2·mNH3 system (see the following chemical reaction: ammoniation and deammoniation) have been designed and these performances [3]-[7] were measured, and because this chemical reaction is well known as higher energy density system as compared with those reactions for other energy storage systems [1] and NH3 is presently attracting an attention as a promising working fluid and NH3 has no relation to greenhouse effect on the earth. The thermophysical properties (e.g. thermal conductivity, thermal diffusivity) of ammoniated salts on the design of those storage systems have been few experimental studies

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