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Wall-Attached night ventilation Combined with Phase Change Material Wallboard in Hot Summer:An Experimental Study on the Thermal Performance

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Journal of Thermal Science 2022年第2期31卷 318-331页

作者： JI Wenhui YUAN Yanping LI Yajun YU Min School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031China

night ventilation is regarded as a promising cooling strategy by storing night cooling in the thermal mass of the ***,night ventilation performance in hot summer is restricted by the climatic *** this paper,we propose a new solution as the integration of wall-attached night ventilation(WANV)and phase change material wallboard(PCMW).The principle of the proposed system is to utilize the wall-attached jet ventilation to achieve forced convection and to adopt latent energy storage of PCMW to enlarge the energy storage density capabilities,and the coupling method is expected to improve the night ventilation *** experiments were conducted to evaluate the thermal performance of the hybrid system by evaluating indoor temperature history,thermal comfort time and cooling *** to the high thermal energy storage density capability of PCMW,it was found that the presence of PCMW has a negative influence on night cooling efficiency but still has a positive influence on the overall cooling *** proposed WANV combined with the PCMW system significantly increased the temperature decrease of room air and west wall inside surface during one hour's night ventilation by 94.97%and 67.74%,respectively,and reached an extension of 38.42%of indoor thermal comfort *** results highlight the potential of WANV integration of PCMW to improve the thermal performance of night ventilation.

关键词： night ventilation wall-attached jet ventilation phase change material wallboard thermal performance

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The Combination Effect of night ventilation and Thermal Insulation on Passive Cooling of Buildings in Baghdad

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Journal of Energy and Power Engineering 2012年第11期6卷 1764-1771页

作者： Dheyaa Wajid Abbood Tawfeeq Kadheem Faleh A1-Hamdi College of Engineering Al-Mustansiriya University Baghdad P. O. Box 14022 Iraq

An experimental investigation of passive cooling buildings has been carried out for a typical summer days extended from July to December of Baghdad in Iraq. Six independent chambers were designed and constructed for different roof constructions. night ventilation has been applied to study the possibility of reducing air temperature in buildings by testing different air changes per hour extended from 5 to 30. Measurements outside chambers including air temperature; relative humidity and solar radiation were achieved, while surface temperature and air temperature inside the chambers were recorded. The results show that the air temperature can be decreased with a range from 3 ℃ to 6 ℃ when using 50 mm polystyrene. This decrease can further be lowered by 2 ℃ to 4 ℃ if night ventilation of change per hours in buildings is allowed. The reduction in air temperature can be reduced to 5 ℃ by combination of external night ventilation and white paint.

关键词： Passive cooling design thermal mass thermal insulation polystyrene night ventilation Baghdad.

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Natural ventilation Design:Predicted and Measured Performance of a Hostel Building in Composite Climate of India

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Energy and Built Environment 2021年第1期2卷 82-93页

作者： Durva Gupta Vaibhav Rai Khare Centre for Energy&Environment Malaviya National Institute of TechnologyJaipur

Natural ventilation is recognized for improving the thermal comfort of the built environment and indoor air *** provides comfortable conditions for building occupants and reduces energy consumption for ***,it is important to study and explore effective means of ventilation to improve the building *** study investigates the thermal comfort of a naturally ventilated hostel operational building in the composite climate of Jaipur,India using Computational Fluid Dynamics(CFD)simulation tool‘Cradle scSTREAM’.A 3D building model has been developed to analyze the thermal comfort for different natural ventilation strategies with advanced mesh algorithms which generate fewer mesh elements and maintain good mesh quality.A field study was carried out to collect the actual data and to validate the model which was further used to evaluate the thermal comfort range based on the ASHRAE-55 *** design strategies have been applied to enhance thermal *** was found that an increase in air velocity up to 0.5 m/s was achieved by Cross ventilation while a drop of 2.0-2.5℃in the air temperature was found using night *** can be stated that cross ventilation increases the air movement while night ventilation gives comparatively higher comfort regarding air temperature and relative humidity.

关键词： Natural Ventilated Buildings CFD Cradle scSTREAM night ventilation Cross ventilation Thermal Comfort

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