Study on the rheological properties and phase-change temperature regulation of asphalt modified by high/low-temperature phase change material particles

Study on Miscibility, Thermomechanical Behavior, and Thermoregulation Performance of Paraffin Wax/Bituminous Blends for Solar Thermal Energy Storage Applications

“…Interestingly, similar LHTI values of 1.17, 1.21, and 1.14 were calculated for T 1 , T 2 , and T 3 sensors, respectively, a result that highlights the homogeneous distribution of paraffin wax in the BP40 sample, as well as its proper stability during the thermoregulation test. Although the value of this index depends on the temperature cooling rate used in the test, LHTI values here obtained are higher than those obtained after adding 6 wt % microencapsulated PEG-2000 to bitumen (LHTI value of ca. 0.7 at a fast cooling rate of 10 °C/min) or 7 wt % polyurethane solid–solid PCM (LHTI value of ca.…”

“…Although the value of this index depends on the temperature cooling rate used in the test, LHTI values here obtained are higher than those obtained after adding 6 wt % microencapsulated PEG-2000 to bitumen (LHTI value of ca. 0.7 at a fast cooling rate of 10 °C/min) or 7 wt % polyurethane solid–solid PCM (LHTI value of ca. 0.1 at 2 °C/min) .…”

“…To that end, the encapsulation of PCMs is considered the most mature technology to manufacture PCM/bituminous materials with advanced thermal functionalities for pavement and building applications. Thus, bitumen doped with adequate encapsulated PCMs is effective in dampening changes in pavement temperatures and, thereby, can contribute to minimizing the pavement failures associated with the extreme in-service temperatures, such as rutting and cracking. − In addition, encapsulated PCMs have also been employed to manufacture road pavement solar collectors. , As for building applications, encapsulated PCMs act as thermo-regulating agents, contributing to thermal comfort and energy saving. , However, this strategy presents some disadvantages that would restrict its industrial application: (i) a substantial increase in the final price, (ii) a reduction in the efficiency of the heat-transfer processes due to the low thermal conductivity of the compounds used to create the shell, and (iii) a reduction in the effective concentration of PCMs in the final product. , Interestingly, form-stable PCM/bituminous materials are one of the strategies currently being used for encapsulation. This technology consists of the creation of a polymer/bitumen matrix with enough global stiffness to fix the PCM, preventing its leakage during the melting process. − Thus, the use of form-stable PCM/bituminous materials would be a cheaper method to obtain energy-efficient bituminous products with advanced thermal properties for paving and building applications.…”

Engineering Polymeric Phase-Change Sub-Microcapsules with a High Encapsulation Fraction by Facile, Versatile Suspension Polymerization

“…With the depletion of nonrenewable energy, improving the efficiency of energy and increasing the utilization of sustainable energy have become the trend of future development. − In a wide variety of energy conversions, there is always a portion of heat that is lost in the conversion process. − A large amount of heat is inevitably lost in daily production and life, and about 90% of the global energy budget involves heat conversion. Besides, solar energy is also a sustainable source of thermal energy. ,, Storing thermal energy is a way of storing energy for efficient use of waste heat and solar heat. − Phase-change materials (PCMs) are used to release/absorb thermal energy by melting/crystallizing in a narrow temperature range, which is called latent heat. − PCMs have become one of the most promising methods of storing thermal energy because of their large energy storage density and thermostatic energy storage. , They have great potential applications in smart textiles, smart buildings, batteries, etc. − …”

“…13−16 PCMs have become one of the most promising methods of storing thermal energy because of their large energy storage density and thermostatic energy storage. 17,18 They have great potential applications in smart textiles, smart buildings, batteries, etc. 19−21 Compared with traditional inorganic PCMs, organic solid− liquid PCMs have the advantages of a narrow phase-change temperature (T pc ) interval, low subcooling, large energy storage density, and chemical stability, which have attracted much attention.…”