Abstract
A standard ultramarine pigment was used to produce phase change material composites, by adsorbing n-hexadecane paraffin around the pigment surface with the aim of obtaining a pigment providing thermal storage capacity apart from color. Vacuum impregnation method was employed optimizing the process variables to maximize the latent heat of the hexadecane/pigment composite. In addition to the process optimization, the stability of the composite having the maximum latent heat was investigated. The hexadecane/pigment composite providing the highest latent heat has a Latent heat of fusion of 44 J/g (around a 20%wt. hexadecane adsorbed in the pigment). Durability of the material was tested by thermo-diffractometric measurements. The results indicate slow reduction of the area intensity up to 6.5% after the 100 cycles.
Highlights
Phase change materials (PCM) have the ability to store a large amount of latent heat within the temperature range associated with a phase change as they have a high enthalpy of fusion in a small volume [1].PCM integrated building components could have a high potential because of their ability to reduce energyHow to cite this paper: Aranzabe, E., Villasante, P.M., March, R., Arriortua, M.I., Larrañaga, A. and Aranzabe, A. (2015) More than Color: Pigments with Thermal Storage Capacity; Processing and Degradation Behavior
Taking into account that ultramarine blue are a family of low-cost mineral pigments with high pigmentary properties and commonly used in construction sector, the aim of this study is to develop a form-stable phase change material composites based on ultramarine blue as the supporting matrix and n-hexadecane as the PCM
The maximum latent heat obtained for the Hexadecane/pigment composites fabricated by vacuum impregnation method is 44.40 J/g and was obtained using following process conditions: Ratio Pigment: Hexadecane of 1:0.8, a time having the pigment under vacuum of 15 minutes, the time having the mixture pigment-hexadecane under vacuum of 15 minutes, the time having the pigment-hexadecane mixture at atmospheric pressure of 15 minutes and using petroleum ether as the best cleaning strategy
Summary
Phase change materials (PCM) have the ability to store a large amount of latent heat within the temperature range associated with a phase change as they have a high enthalpy of fusion in a small volume [1]. Materials used as PCMs can be divided into different subcategories based on their chemical composition: organic compounds, inorganic compounds and eutectic mixtures Among these materials, paraffin is believed to be the most promising phase change material because is stable, non-toxic and not corrosive; it has a large latent heat and low cost [4]-[8]. The storage materials and containers have insufficient long term stability and this has limited the use of latent heat stores This poor stability is mainly due to the poor stability of the materials properties due to thermal cycling. Taking into account that ultramarine blue are a family of low-cost mineral pigments with high pigmentary properties and commonly used in construction sector (concrete, paints, polymers), the aim of this study is to develop a form-stable phase change material composites based on ultramarine blue as the supporting matrix and n-hexadecane as the PCM. Given that the crystal signal of the n-hexadecane could be monitored by using X-ray diffraction, 100 cycles of heating and cooling were performed and the area intensity of the crystals was monitored
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