A comparative investigation of the effect of honeycomb core on the latent heat storage with PCM in solar air heater

Khaled

Journal of Energy Storage

et al. 2021

207

Researchers worldwide are investigating thermal energy storage, especially phase change materials, for their substantial benefits in improving energy efficiency, sustaining thermal comfort in buildings and contributing to the reduction of environmental pollution. Residential buildings and commercial constructions, being dependent on heating and cooling systems, are subjected to the utilization of PCM technology through several applications. The current study presents a state-of-the-art review that covers recent literature on thermal energy storage systems utilizing PCMs for buildings. The reviewed applications are heating and hybrid applications, that are categorized as passive and active systems. A summary of the PCMs used, applications, thermo-physical properties and incorporation methods are presented as well. The study emphasizes the promising effectiveness of PCM in building heating applications, and highlights the significance of PCM system hybridization. The study shows that experimental investigations on commercial constructions, and hybrid systems development and optimization, are still required. Finally, possible combinations of active and passive heating applications with their auspicious benefits in terms of energy efficiency augmentation, are recommended. Highlights  State-of-the-art review on PCM building applications for heating and hybrid systems  Active and Passive classification for heating and hybrid systems  Challenges altering the PCM technology for energy-efficient buildings are addressed  Hybridization of active and passive systems forms a potential method toward NZEB

Section: Solar Air Heatermentioning

confidence: 99%

A review on phase change materials for thermal energy storage in buildings: Heating and hybrid applications

Khaled

Journal of Energy Storage

et al. 2021

207

“…Researches focused on the use of PCM in buildings contained several applications that are categorized as Passive PCM applications or Active PCM applications. PCMs are used passively in building envelopes as: walls [14][15][16], Trombe walls [17], solar façades [18,19], roofs [8], floors , suspended ceilings [20], windows [21], decorative elements, furniture and textiles [22][23][24], and passive heat exchanger components; or actively being coupled to: radiant heating systems (RHS) [25][26][27], solar water heating systems (SWHS) [28], radiative cooling (RC) [29], thermally activated building structures (TABS), solar air heater (SAH) [30][31][32], heating, ventilating and air conditioning (HVAC), geo-cooling [2], activated TWs and activated solar façades. Any combination of the aforementioned PCM-LHTES system applications yields a particular important study as mentioned in previous works [33,34].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Use of Enhanced Coconut Oil and Paraffin Wax Phase Change Material in Active Heating Using Advanced Modular Prototype

Khaled

Journal of Energy Storage

et al. 2021

The use of phase change materials in buildings as a thermal energy storage system gained the attention of researchers all over the world. In the current study, coconut oil bio-based PCM is macro-encapsulated with enhanced thermal conductivity containers and coupled with hydronic radiant floor heating system. The study follows experimental aspect utilizing two identical small scale modular test prototypes. Investigations are directed toward studying the effect of the active CO-PCM system under different weather conditions, effect of combining active and passive systems, effect of PCM choice/type and effect of PCM location within the active floor, on the thermal and energy storage performances. Results revealed that coupling CO-PCM to active floor, passive wall and passive roof is capable of achieving load shifting and energy savings; and is affected by the control method, weather conditions, electricity tariff policy and PCM position and type. Further discussions, conclusions and perspective recommendations are summarized within the article. Highlights Identical experimental advanced modular prototypes are designed and implemented.  Macro-encapsulation technique using enhanced thermal conductivity containers.  Thermal comfort and temperature fluctuations reduction using CO and PW PCMs.  Load shifting by combined CO-PCM applications leads to possible annual cost saving.  Positioning CO-PCM plates below heating layer ensued energy saving of 393.5 kWh.

“…(c) Many types of PCM result in wide distribution of phase change temperature range. Therefore, PCM have good application prospects like battery thermal management, solar heater, building (bricks and cement), industrial waste heat recovery systems, and textiles …”

Section: Introductionmentioning

confidence: 99%

Thermal properties and characterization of palmitic acid/nano silicon dioxide/graphene nanoplatelet for thermal energy storage

et al. 2020

Palmitic acid (PA), nano silicon dioxide (nano SiO 2 ), and graphene nanoplatelets (GNPs) were fabricated to composite phase change materials (PCMs) for thermal energy storage. PA acted as PCM, nano SiO 2 was used as supporting material. GNP as thermal conductivity promoter was added to modify composite PCM. Nano SiO 2 has good adsorption property and can adsorb liquid PCM to prevent leakage. Leakage measurement indicated that PA maximum content in composite PCM is 70 wt%. Chemical and crystal structures, and microstructure of composite PCM were tested by Fourier transformation infrared spectroscope, X-ray diffractometer and scanning electronic microscope, which showed that the raw materials are well mixed by physical action. Differential scanning calorimeter result presented that composite PCM possess phase change temperature at about 60 C and latent heat of 128.42 kJ/ kg. Thermogravimetric analyzer and thermal cycle experiment showed that composite PCM have outstanding thermal stability and durability. Thermal conductivity apparatus measurement results indicated that thermal conductivity of composite PCM with 5 wt% GNP is 1.65 times that of composite PCM without GNP. Therefore, this composite PCM are potential materials for thermal energy storage. K E Y W O R D Scomposite phase change material, graphene nanoplatelet, nano silicon dioxide, thermal energy storage, thermal property