A green roof is a specialized roof system that supports vegetation growth on rooftops.This technology is rapidly gaining popularity as a sustainable design option for buildings.In order to contribute to an understandi...A green roof is a specialized roof system that supports vegetation growth on rooftops.This technology is rapidly gaining popularity as a sustainable design option for buildings.In order to contribute to an understanding of green roof in regions with cold winters and snow,an on-site experimental investigation was present with a focus on the assessment of green roof performance during the winter.This field experiment took place on a six small buildings during the winter of 2010-2011.The work monitored three buildings with green roofs,two buildings with reference roofs and one building with a bare soil coverage for the roof.These six buildings were identically constructed and instrumented with sensor networks to provide heat flux data through the roofs.The 15 min averaged data were statistically analyzed for a week under the two separate periods,first without a snow cover and second with a snow cover.The results show that the roof type is a significant factor in affecting the thermal performance of these buildings.Most importantly,green roofs reduce heat flow through the roof and thus reduce the heating energy demand during the winter.However,the energy savings for buildings with the green roofs are reduced under snow conditions because the snow diminishes thermal resistance of the roof and increases the heat transfer process through the roofs.展开更多
During last decades the solar passive heating of buildings found rather wide application. It has been used effectively in an estimated 17,000 commercial buildings in the United States-ranging from offices to schools, ...During last decades the solar passive heating of buildings found rather wide application. It has been used effectively in an estimated 17,000 commercial buildings in the United States-ranging from offices to schools, and airport terminals. At present there exist two main types of solar houses, ＂house collector＂ and ＂wall collector＂. A part of researchers find that the use of＂house collector＂ is more simple and efficient. The other part is sure that ＂wall collector＂ is more convenient to use and it has higher efficiency. But our analysis show that in existing literature there is not any method for evaluating efficiency of solar houses. Moreover, there is not in. use a concept on solar houses efficiency. To us each type of solar houses has its own advantages and disadvantages. In this paper solar passive ＂House-Collector＂ heating modes of houses and their efficiency are discussed. For calculation of designing parameters of solar houses a simplified method is presented, taking into consideration both the heat gains and heat losses.展开更多
基金Project(CMMI-0900486) supported by the National Science Foundation (NSF) in the Division of Civil, Mechanical, and Manufacturing Innovation, USA
文摘A green roof is a specialized roof system that supports vegetation growth on rooftops.This technology is rapidly gaining popularity as a sustainable design option for buildings.In order to contribute to an understanding of green roof in regions with cold winters and snow,an on-site experimental investigation was present with a focus on the assessment of green roof performance during the winter.This field experiment took place on a six small buildings during the winter of 2010-2011.The work monitored three buildings with green roofs,two buildings with reference roofs and one building with a bare soil coverage for the roof.These six buildings were identically constructed and instrumented with sensor networks to provide heat flux data through the roofs.The 15 min averaged data were statistically analyzed for a week under the two separate periods,first without a snow cover and second with a snow cover.The results show that the roof type is a significant factor in affecting the thermal performance of these buildings.Most importantly,green roofs reduce heat flow through the roof and thus reduce the heating energy demand during the winter.However,the energy savings for buildings with the green roofs are reduced under snow conditions because the snow diminishes thermal resistance of the roof and increases the heat transfer process through the roofs.
文摘During last decades the solar passive heating of buildings found rather wide application. It has been used effectively in an estimated 17,000 commercial buildings in the United States-ranging from offices to schools, and airport terminals. At present there exist two main types of solar houses, ＂house collector＂ and ＂wall collector＂. A part of researchers find that the use of＂house collector＂ is more simple and efficient. The other part is sure that ＂wall collector＂ is more convenient to use and it has higher efficiency. But our analysis show that in existing literature there is not any method for evaluating efficiency of solar houses. Moreover, there is not in. use a concept on solar houses efficiency. To us each type of solar houses has its own advantages and disadvantages. In this paper solar passive ＂House-Collector＂ heating modes of houses and their efficiency are discussed. For calculation of designing parameters of solar houses a simplified method is presented, taking into consideration both the heat gains and heat losses.
