https://orcid.org/0000-0001-5420-4584
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ABSTRACT
In arid locations, global warming raises the indoor air temperature and energy utilization of residential and commercial buildings. Developing effective passive cooling solutions is critical for lowering room air temperatures and improving building energy consumption. The phase change materials (PCMs) based thermal energy storage (TES) roofing systems have received more attention in recent years due to their ability to decrease the energy consumption of the buildings. The PCMs were used in different ways, such as encapsulated PCM systems, free cooling applications, air-conditioning systems, and sorption cooling systems. The results of various studies have revealed that a decrease in indoor air temperature of approximately 1–3°C was obtained. Integration of PCMs with other cooling techniques may further improve the building cooling effects. The current study attempts to improve the cooling effect by integrating a PCM with a double-skin aluminium radiation reflector (ARR) in the summer seasons of an arid region like the Sultanate of Oman. Field investigations indicated that the double skin PCM-ARR cool roof room had a substantial drop in room air and roof surface temperatures than a standard bare concrete roof. The experimental investigation revealed that the room air, interior, and exterior roof surface temperatures of the double skin PCM-ARR roof model were reduced by 3.63°C (9.08%), 12.68°C (30.1%), and 16.92°C (37.3%) than the reference roof model, respectively. The corresponding average reduction in the heat flux was 18 W/m2. The presence of dynamic air between PCM and ARR resulted in the roof’s superior thermal resistance (convective heat flux). The experimental research has shown that during the summer seasons, the double skin roof PCM-ARR substantially lowers temperatures of interior air and roof surface of buildings.
Nomenclature
| Symbols | ||
| kr | = | Aluminium sheet thermal conductivity (W/m K) |
| αr | = | Absorption Coefficient |
| σ | = | Stefan-Boltzmann constant(W/m2 K4) |
| E | = | Solar irradiation (W/m2) |
| Tc | = | The temperature of PCM (K) |
| ho | = | Convective heat transfer coefficient between ambient air & ARR, (W/m2 K) |
| hg | = | Air gap convective heat transfer coefficient (W/m2 K) |
| Tr | = | Reflector inside temperature (K) |
| Cp | = | Specific heat capacity (J/kgK) |
| t | = | Time in sec |
| T | = | Temperature (K) |
| = | Surface emissivity | |
| Tsky | = | Sky temperature (K) |
| R | = | Emissivity ratio of surface |
| To | = | The temperature of outside air (K) |
| TR | = | Reflector Exterior temperature(K) |
| Tg | = | Air gap temperature (K) |
| ρ | = | Density (kg/m3) |
| k | = | Thermal conductivity |
Abbreviations
| ARR | = | Aluminium Radiation Reflector |
| PCM | = | Phase changing Material |
| RCC | = | Reinforced cement concrete |
Disclosure statement
No potential conflict of interest was reported by the author(s).