The Behavior of Glauber's Salt as a Heat Storage Material for Residential Iraqi Buildings
Phase change materials (PCMs) are regarded as a possible solution for reducing the energy consumption required for space heating by storing the heat daytime and releasing it at night. Glauber's salt (Na2SO4.10H2O) is one of the inorganic phase change materials. It possesses some desired properties over other PCMs such as low melting point, high thermal capacity and high thermal conductivity. The present study assists in evaluation of Glauber's salt as a PCM for heating required in residential buildings. The PCM was integrating with a glazed roof of a rig model to absorb the heat comes from sun during daytime and releasing it to the inside at night. Building considerations and thermo-physical properties of PCMs have been taken into account, while the ambient conditions and indoor conditions have measured experimentally. Results obtained showed that the indoor temperature could increase by 2-4 oC in the winter compared to that measured in a traditional one. Furthermore, a simulation program depended on degree-days method explained that the energy consumption could be saved up to 45 % even that salt hydrates have some problems related to super-cooling effects, phase segregation and incongruent melting.
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