BITS Faculty Publications
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Item Thermal Energy Storage Properties of Hybrid Nanocomposite–Embedded Phase Change Material for Sustainable Buildings(Scientific net, 2014) Parameshwaran, R.The thermal properties of the new copper–titania hybrid nanocomposite embedded organic ester phase change material (HNPCM) were analyzed experimentally. The surface functionalized hybrid nanocomposite (HyNC) embedded into the PCM has effectively created the densely packed network of thermal interfaces in the PCM matrix layers. The experimental results suggest that, the incorporation of the HyNC has enabled the HNPCM to exhibit improved thermal conductivity (0.347 W/m K), congruent phase transition temperature (freezing: 33.53ᵒC, melting: 35.32 ᵒC), high latent heat capacity (freezing: 109.05 kJ/kg, melting: 109.14 kJ/kg) and considerable reduction in (freezing time: 21.2%, melting time: 29.2%). The improved thermal properties being achieved facilitate the HNPCM to be considered as a viable thermal storage material for high performance and sustainable building cooling and heating applications.Item Experimental Study on PCM-Based External Wall Cladding for Energy Efficient Buildings(Springer, 2020-01) Parameshwaran, R.The present work reports the experimental investigation of the phase change material (PCM) incorporated into the external wall claddings for achieving energy conservation in building through a passive cooling application. Three types of wall claddings of size 458 mm × 458 mm (1.5 ft × 1.5 ft) in dimension were developed in this experimental study. Lauric acid was utilized as the PCM to be incorporated into the wall claddings. Experimental results suggest that the lauric acid exhibited good latent heat potential, congruent phase change processes, and was thermally stable within operating temperature ranges. Furthermore, it was concluded that out of three cladding types being tested, the percentage drop of air temperature was more in composite wall cladding and the percentage drop of heat flux was more in aluminum box cladding with PCM and coarse aggregate. In total, the cladding incorporated with the PCM was found to be the potential candidate for the enhancement of energy efficiency in building through passive thermal storage and cooling load reduction.Item Nanomaterial-Based PCM Composites for Thermal Energy Storage in Buildings(Springer, 2016-02) Parameshwaran, R.Energy efficiency in buildings is a vital factor to be addressed in every stages of development of building envelopes, since buildings consume almost one-third to one-quarter of energy being produced globally. In the spectrum of techniques available to cater the building cooling and heating load demands, there has been a continuous quest toward latent thermal energy storage (LTES) systems for achieving energy redistribution requirements in buildings. The interesting fact about the LTES systems relies on the phase change materials (PCMs) being used to store and release heat energy depending upon the thermal load demand. A step ahead, the utilization of nanomaterials paves the way for accomplishing enhanced thermal performance of such PCMs on a long run. This chapter is exclusively dedicated to provide better understanding of a variety of nanomaterial-based PCM composites for thermal energy storage and energy efficiency in buildings. This is an ever-growing as well as emerging field of interest to wide scientific and engineering communities globally. The nucleus of this chapter is focused on the enhancement of thermal energy storage capabilities of NanoPCM composites which would contribute for achieving improved energy efficiency in buildings.Item Energy conservative air conditioning system using silver nano-based PCM thermal storage for modern buildings(Elsevier, 2014-02) Parameshwaran, R.This work aims at improving the thermal performance and energy efficiency of chilled water based variable air volume air conditioning system integrated with the silver nanoparticles embedded latent thermal energy storage system. The latent thermal energy storage air conditioning system incorporated with the demand controlled ventilation and the economizer cycle ventilation schemes were experimentally investigated for the year-round building air conditioning application. Phase change material embedded with silver nanoparticles enabled it to exhibit improved heat transfer mechanisms in charging and discharging cycles. Experimental results suggest that the proposed air conditioning system achieved an on-peak and per day average energy savings potential of 36–58% and 24–51%, respectively, for year round operation while compared to the conventional air conditioning system. Similarly, while compared with a basically similar variable air volume air conditioning system, the proposed air conditioning system yielded 7.5–18.6% and 7.9–17.8% of on-peak and per day average energy conservative potential, respectively. Furthermore, test results infer that the combined effects produced by the silver nanoparticles embedded latent thermal energy storage system with the ventilation techniques augmented the overall thermal performance of the system. In total, the combined air conditioning system would be beneficial in terms of accomplishing good thermal comfort, acceptable indoor air quality and energy redistribution needs in buildings without sacrificing energy efficiency.