Modeling and Validation of the Cool Summer Microclimate Formed by Passive Cooling Elements in a Semi-Outdoor Building Space

Rio, Maria Alejandra Del; Asawa, Takashi; Hirayama, Yukari

doi:10.3390/su12135360

Cited by 5 publications

(4 citation statements)

References 62 publications

(84 reference statements)

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“…To initiate the CFD analysis, the wind tunnel was configured to be four times the height of the building, extending five times further in front and to the sides and ten times downwind of the building to ensure undisturbed flow conditions [73]. Another critical step involved selecting the mesh type for the CFD simulations, as it directly influences the accuracy and efficiency of airflow modelling [74]. In our study, we initially employed structured meshes, which consist of grids composed of structured cells like hexahedra (in 3D) or quadrilaterals (in 2D) [75].…”

Section: Ventilation Analysismentioning

confidence: 99%

Optimising Daylight and Ventilation Performance: A Building Envelope Design Methodology

Abdollahi Rizi,

Sangin,

Haghighatnejad Chobari

et al. 2023

Buildings

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The future of building envelope design lies in smart adaptation. The current literature overlooks the crucial integration of airflow, ventilation and daylighting in adaptive façade design. Moreover, it neglects the occupants’ locations, activities and interior layouts in this context. This study introduces an innovative approach to adaptive building envelope design, aiming to enhance occupants’ comfort through parametric analysis of daylight and airflow. The research combines parametric simulation, computational fluid dynamics (CFD) analysis and multiobjective optimisation. The optimisation goal is to improve visual comfort and indoor air quality while maintaining air temperature and velocity within the human comfort range. The study contributes to providing designers with a method for building envelope design that considers visual comfort and airflow, resulting in more interactive building envelopes that are adaptable to environmental conditions for enhanced utility and comfort. Results indicated that the optimised façade configuration and design methodology can achieve a 69% improvement in daylight performance, improving useful daylight illuminance (UDI) while reducing glare risk. Additionally, air changes per hour (ACH) showed a 38% annual improvement. This research signifies a significant step towards more efficient and occupant-centric building envelope design, aligning with the evolving demands of the construction industry and sustainable building practices.

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Section: Ventilation Analysismentioning

confidence: 99%

Optimising Daylight and Ventilation Performance: A Building Envelope Design Methodology

Abdollahi Rizi,

Sangin,

Haghighatnejad Chobari

et al. 2023

Buildings

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“…Due to the similar outdoor environment, meteorological conditions, and microclimate, the validation method in this study followed the one conducted by Del Rio et al [42], which adopted the CFD-based simulation method to observe the cross-ventilation performance by large openings. Different from their case, the humidity conditions were added to be tested in our validation, and the input relative humidity as the boundary condition was observed in the experiment.…”

Section: Validation Of Computational Fluid Dynamics (Cfd) Simulation ...mentioning

confidence: 99%

Experimental and Numerical Analysis on Effect of Passive Cooling Methods on an Indoor Thermal Environment Having Floor-Level Windows

Qin

Asawa

et al. 2022

Sustainability

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Natural ventilation is a common passive cooling method for improving air quality and thermal comfort; however, hot temperatures in summer and safety and privacy issues at night often result in its unideal performance. Therefore, we proposed the use of floor-level windows, mainly combined with microclimate improvement, to improve the indoor thermal environment by enhancing the cooling effect of natural ventilation during summer. Our study area was a house in Machida, Tokyo. We evaluated the effectiveness of our method in improving the indoor thermal environment in summer and performed a numerical simulation, while illustrating the detailed horizontal and vertical distribution of airflow in the house through the floor-level windows. The influence of different window types and opening angles of floor-level windows on ventilation and cooling was determined using the simulation. We found that: (a) natural ventilation-based passive cooling methods reduced semi-outdoor and indoor temperature and increased the humidity; (b) the airflow formed an indoor wind path; south-westerly inflow was from western floor-level windows and the skylight, and the outflow was from northern floor-level windows; and (c) the side hung windows (with an opening angle of 60°) were an ideal option to improve indoor airflow. However, there was no improvement in the passive cooling performance, due to the inflow of warmer outside air.

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“…He (2011) and J. He and Hoyano (2010, 2011), or wetted sun blinds (Del Rio et al, 2020). Green walls also operate as evaporative cooling surfaces and can be installed not only outdoors but also indoors (L. Pérez‐Urrestarazu et al, 2015).…”

Section: Potential Applications Of Dec Padsmentioning

confidence: 99%

Direct evaporative cooling from wetted surfaces: Challenges for a clean air conditioning solution

Tejero‐González

Franco-Salas

2021

WIREs Energy & Environment

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Evaporative cooling has a major role to play in fighting climate change and in achieving a low‐carbon economy. As it helps to reduce energy demand for air conditioning, it is gaining attention in terms of improving energy efficiency in buildings. Evaporative cooling from wetted media can enhance water–air contact, thereby improving heat and mass transfer further and avoiding aerosols. Wetted media are commonly called evaporative cooling pads and are widely used in greenhouses, intensive livestock farming, and industrial facilities. However, a deep understanding of evaporative cooling pad performance can enhance their application to indoor occupied spaces such as residential or commercial cooling, or in hybrid air conditioning systems. Most studies analyze pad performance mainly in terms of pressure drop and saturation effectiveness. However, some studies propose alternative cooling efficiency parameters and others provide insights into key aspects such as power requirements and the coefficient of performance, water consumption, risk of water entrainment, material decay, and air quality, as well as the effect of water temperature and salinity, solar radiation, or wind speed. Existing results on these less studied performance issues are reviewed, and we identify the gaps in the literature in addition to highlighting the main challenges encountered, in an effort to guide future researchers in the field and enhance the application of direct evaporative cooling. This article is categorized under: Energy Efficiency > Systems and Infrastructure Energy Systems Analysis > Systems and Infrastructure

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Modeling and Validation of the Cool Summer Microclimate Formed by Passive Cooling Elements in a Semi-Outdoor Building Space

Cited by 5 publications

References 62 publications

Optimising Daylight and Ventilation Performance: A Building Envelope Design Methodology

Optimising Daylight and Ventilation Performance: A Building Envelope Design Methodology

Experimental and Numerical Analysis on Effect of Passive Cooling Methods on an Indoor Thermal Environment Having Floor-Level Windows

Direct evaporative cooling from wetted surfaces: Challenges for a clean air conditioning solution

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