This paper investigates the influence of temperature and wind conditions on ventilation of the air cavity beneath the roofing in a full-scale pitched wooden roof construction.The potential for condensation in the air ...This paper investigates the influence of temperature and wind conditions on ventilation of the air cavity beneath the roofing in a full-scale pitched wooden roof construction.The potential for condensation in the air cavity is studied.The relevant roof construction is equipped with 81 thermocouples and four air velocity measurement devices.A weather station at the site records outdoor temperature and wind conditions.Five periods between 2016 and 2018 are investigated.The findings show distinct periods of below-ambient temperature and positive condensation potential in the ventilated air cavity of the roof.A relation between low wind speed and positive condensation potential is shown.Difference in size of periods with below-ambient temperature and periods with positive condensation potential implies that the materials in the roof regulate the humidity in the air cavity.Large negative peaks in the condensation potential indicate dry-out of the construction.展开更多
As a new type of green low-carbon engineered wood product,cross-laminated timber(CLT)is widely used in various types of wooden buildings in Europe and North America,and the number of high-rise wood construction is als...As a new type of green low-carbon engineered wood product,cross-laminated timber(CLT)is widely used in various types of wooden buildings in Europe and North America,and the number of high-rise wood construction is also increasing.Based on the introduction of the structural characteristics of the CLT and the development status of the CLT in developed countries,this paper focused on the review of the status of research and development of the CLT in China,with an emphasis on the breakthrough technologies of new bamboo-wood composite CLT developed.Finally,the prospects of the CLT in China were discussed.展开更多
文摘This paper investigates the influence of temperature and wind conditions on ventilation of the air cavity beneath the roofing in a full-scale pitched wooden roof construction.The potential for condensation in the air cavity is studied.The relevant roof construction is equipped with 81 thermocouples and four air velocity measurement devices.A weather station at the site records outdoor temperature and wind conditions.Five periods between 2016 and 2018 are investigated.The findings show distinct periods of below-ambient temperature and positive condensation potential in the ventilated air cavity of the roof.A relation between low wind speed and positive condensation potential is shown.Difference in size of periods with below-ambient temperature and periods with positive condensation potential implies that the materials in the roof regulate the humidity in the air cavity.Large negative peaks in the condensation potential indicate dry-out of the construction.
基金the science project of JSCAF(No.2017KJ04)Natural Science Research General Project of Jiangsu Province(No.16KJD220001)+1 种基金It was also supported by Ningbo Science Research Project of Social Development(No.2017C510004)Postdoctoral Research Funding Program of Jiangsu Province(No.2018K121C).
文摘As a new type of green low-carbon engineered wood product,cross-laminated timber(CLT)is widely used in various types of wooden buildings in Europe and North America,and the number of high-rise wood construction is also increasing.Based on the introduction of the structural characteristics of the CLT and the development status of the CLT in developed countries,this paper focused on the review of the status of research and development of the CLT in China,with an emphasis on the breakthrough technologies of new bamboo-wood composite CLT developed.Finally,the prospects of the CLT in China were discussed.
