Numerical and experimental investigation of the indoor air quality and thermal comfort performance of a low energy cooling windcatcher with heat pipes and extended surfaces

Calautit, John Kaiser; Tien, Paige Wenbin; Wei, Shuangyu; Calautit, Katrina; Hughes, Ben Richard

doi:10.1016/j.renene.2019.06.040

Cited by 50 publications

(14 citation statements)

References 31 publications

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“…In addition, the ventilated room dimensions were evolved from a previous experimental model [12] with some modifications. The ventilated room had two exit openings located on the opposite side walls as recommended by Alsailani et al [34]. The volume of both the basic and new windcatcher models was about 6% of the volume of the ventilated room.…”

Section: Physical Geometrymentioning

confidence: 99%

“…In addition, the outdoor airstream effect was analyzed on the internal flow features of the traditional two-sided windcatcher model [11]. Calautit et al [34] studied the indoor ventilation quality in buildings with a passive cooling windcatcher integrated with heat pipes via numerical modeling using the standard k-epsilon turbulence model. Alsailani et al [35] utilized detailed 3D steady RANS CFD simulations to study the effect of 40 different geometries of windcatchers on the performance of the cross-ventilation inside buildings.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study on Natural Ventilation Characteristics of a Partial-Cylinder Opening for One-Sided-Windcatcher of Variable Air-Feeding Orientations in Taif, Saudi Arabia

et al. 2021

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To provide a clean and cheap source of natural ventilation in windy and arid zones, a windcatcher facility is the best option. This paper aims to study the effect of the inlet opening angle of a new windcatcher model with different values ranging from 60° to 90° for three different feeding orientations at leading-down, central-up, and trailing-down locations. The ventilation performance of the new one-sided windcatcher is numerically examined using CFD simulations, where the 3D RANS and k-epsilon equations are applied at different wind speeds. The flow features of the new models are analyzed and compared with a basic traditional model based on the induced air distribution, aerodynamic losses, and ventilation rates. Results revealed that the sharp edge of the inlet opening leads to an increase in the flow separation and recirculation zone, especially when the opening angle is increased. The highest pressure coefficient is achieved by the trailing-down model compared with the other windcatcher models at an opening angle of 90°. The total pressure drop and ventilation rates increase in all the new windcatcher models due to the increase in the opening angle from 60° to 90°. At identical conditions, with an opening angle of 90° and wind speed of 5 m/s, the trailing-down model achieved a higher pressure coefficient than the leading-down and central-up models by 20.55% and 37.37%, respectively. Furthermore, the trailing-down model could provide higher ventilation rates than the central-up and leading-down models by 31% and 42%, respectively. Finally, the trailing-down windcatcher model can be recommended as the best choice to provide natural ventilation at Taif City in Saudi Arabia.

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Section: Physical Geometrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Study on Natural Ventilation Characteristics of a Partial-Cylinder Opening for One-Sided-Windcatcher of Variable Air-Feeding Orientations in Taif, Saudi Arabia

et al. 2021

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“…Unlike previous work, the study carried out the tests in an atmospheric boundary layer (ABL) wind tunnel with both the building and windcatcher located inside the test section. The work highlighted the importance of testing the full building in the wind flow instead of just the windcatcher, which was commonly done in previous studies [14,15]. This is essential when there are vents or openings located in the low-pressure zones, i.e., the leeward side of the building.…”

Section: Literature Reviewmentioning

confidence: 99%

Design of a Passive Downdraught Evaporative Cooling Windcatcher (PDEC-WC) System for Greenhouses in Hot Climates

et al. 2020

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A windcatcher is a wind-driven natural ventilation system that catches the prevailing wind to bring fresh airflow into the building and remove existing stale air. This technology recently regained attention and is increasingly being employed in buildings for passive ventilation and cooling. The combination of windcatchers and evaporative cooling has the potential to reduce the amount of energy required to ventilate and cool a greenhouse in warm and hot climates. This study examined a greenhouse incorporated with a passive downdraught evaporative cooling windcatcher (PDEC-WC) system using Computational Fluid Dynamics (CFD), validated with experimental data. Different hot ambient conditions of temperature (30–45 °C) and relative humidity (15–45%) were considered. The study explored the influence of different spray heights, layouts, cone angles and mass flow rates on indoor temperature and humidity. The average error between measurements and simulated results was 5.4% for the greenhouse model and 4.6% for the evaporative spray model. Based on the results and set conditions, the system was able to reduce the air temperature by up to 13.3 °C and to increase relative humidity by 54%. The study also assessed the influence of neighbouring structures or other greenhouses that influence the flow distribution at the ventilation openings. The study showed that the windcatcher ventilation system provided higher airflow rates as compared to cross-flow ventilation when other structures surrounded the greenhouse.

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“…Previously, various strategies of PTM, mainly including power-assisted garments, − wearable fabric-based materials, , and the emerging phase-change materials (PCMs), have been proposed to generate thermal comfort. , In the first form, an electrically driven personal cooling or heating system is composed of electrical fans, air blowers, or electrical heating elements to enhance the convective and evaporative dissipation or generate heat for human skin. − To achieve the second form, functional fabrics are required to be specifically designed toward properly dealing with the thermal radiation from the human body. For a cooling cloth, it can reflect solar light and transmit body radiation as much as possible, such that the thermal input is minimized while the thermal output is maximized, leading to a personal cooling effect. − For a heating cloth, in contrast, the solar light is absorbed while the body radiation is blocked as much as possible, such that the thermal input is maximized while the thermal output is minimized, leading to the personal heating effect. , Very recently, PTM using PCMs such as ice, dry ice, paraffin, hexadecane, etc.…”

Section: Introductionmentioning

confidence: 99%

Janus-Type Hydroxyapatite-Incorporated Kevlar Aerogel@Kevlar Aerogel Supported Phase-Change Material Gel toward Wearable Personal Thermal Management

Lin

Lü

et al. 2022

ACS Appl. Mater. Interfaces

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Thermal comfort is of great significance to maintain people’s healthy state in physics, physiology, and psychology. Personal thermal management (PTM) that passively regulates the immediate environment around the human body has been proposed as a promising strategy to realize on-demand human thermal comfort. In this work, we propose a one-stop solution for the state of the art PTM by combining thermal shielding and thermal energy storage in a Janus-type wearable device, which is named a Janus-type hydroxyapatite-incorporated Kevlar aerogel@Kevlar aerogel supported phase-change material gel (HKA@KPG). The lower HKA with an ultralow thermal conductivity directly attached on the skin can effectively hinder heat transfer from the external environment to human skin. The upper KPG possessing a superior form stability and high energy storage capacity can absorb the heat generated by the human body to regulate the skin temperature. Both the HKA and KPG also demonstrate excellent biocompatibility. Due to its synergistic effect in thermal energy regulation, the Janus HKA@KPG has been applied in wearable PTM in static and dynamic modes to meet the thermal comfort requirements. It is anticipated that the one-stop thermal comfort solution for thermal shielding, thermal energy storage, self-supporting characteristics, wearability, and biosafety offers new possibilities for the next generation of wearable PTMs.

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Numerical and experimental investigation of the indoor air quality and thermal comfort performance of a low energy cooling windcatcher with heat pipes and extended surfaces

Cited by 50 publications

References 31 publications

Numerical Study on Natural Ventilation Characteristics of a Partial-Cylinder Opening for One-Sided-Windcatcher of Variable Air-Feeding Orientations in Taif, Saudi Arabia

Numerical Study on Natural Ventilation Characteristics of a Partial-Cylinder Opening for One-Sided-Windcatcher of Variable Air-Feeding Orientations in Taif, Saudi Arabia

Design of a Passive Downdraught Evaporative Cooling Windcatcher (PDEC-WC) System for Greenhouses in Hot Climates

Janus-Type Hydroxyapatite-Incorporated Kevlar Aerogel@Kevlar Aerogel Supported Phase-Change Material Gel toward Wearable Personal Thermal Management

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