Two roof solar collectors (RSCs), conventional single pass RSC and new double pass RSC, were compared. The new roof solar collector, which is formed by integrating a double pass solar air collector with the roof of th...Two roof solar collectors (RSCs), conventional single pass RSC and new double pass RSC, were compared. The new roof solar collector, which is formed by integrating a double pass solar air collector with the roof of the building, can be operated more efficiently for space heating in winter, and for natural ventilation in other seasons. To evaluate the performances of the two RSCs for both space heating and natural ventilation, a single traditional Chinese style house, on which the two RSCs will be mounted, was developed. The efficiency of solar energy conversion for the new RSC is higher than that of the single pass one by 10% on average, and the ventilation rate contributed by natural ventilation for the new RSC can be improved to a great extent for most cases, indicating that the new RSC is superior to the single pass one from the viewpoint of both space heating and natural ventilation. The new RSC is more potential for improving indoor thermal environment and energy saving of buildings.展开更多
Net-zero and other high performance green buildings normally do or should include optimized solar energy systems.While detailed computer-based energy simulations of buildings’energy systems are becoming near-commonpl...Net-zero and other high performance green buildings normally do or should include optimized solar energy systems.While detailed computer-based energy simulations of buildings’energy systems are becoming near-commonplace for many projects,simple,easy-to-use data tables are beneficial earlier in the design process to help guide preliminary decisions in all projects.Practical lookup tables,and then comparison of the data they contain,are also very useful for teaching new concepts,in this case for learning about solar orientations in sunny locations.Engineers,architects,design-build contractors,students,and other designers of green buildings can benefit through knowing,in advance,how exterior surfaces’orientations increase or decrease the total annual solar energy arriving upon those surfaces.For example,maximizing the incoming energy on a particular roof is advantageous for gathering solar energy for heat or for conversion of that sunlight to electricity,but various requirements often limit designers’choices for surfaces’orientations.This paper presents simple tables that form a tool for making initial decisions on surfaces’directions and slopes;the user can then study various effects further,such as local factors including cloudiness and shading,with detailed software.The classical solar geometry equations utilized are documented here for repeatability of the research,but are not necessary for use of this paper’s tables.Practical examples are given too to help readers use the tables.展开更多
基金Shanghai Com mission of Science andTechnology( No.0 3 DZ12 0 12 )
文摘Two roof solar collectors (RSCs), conventional single pass RSC and new double pass RSC, were compared. The new roof solar collector, which is formed by integrating a double pass solar air collector with the roof of the building, can be operated more efficiently for space heating in winter, and for natural ventilation in other seasons. To evaluate the performances of the two RSCs for both space heating and natural ventilation, a single traditional Chinese style house, on which the two RSCs will be mounted, was developed. The efficiency of solar energy conversion for the new RSC is higher than that of the single pass one by 10% on average, and the ventilation rate contributed by natural ventilation for the new RSC can be improved to a great extent for most cases, indicating that the new RSC is superior to the single pass one from the viewpoint of both space heating and natural ventilation. The new RSC is more potential for improving indoor thermal environment and energy saving of buildings.
基金supported by Rock Consulting Engineers and the University of Kansas,both of or near Lawrence,KS.
文摘Net-zero and other high performance green buildings normally do or should include optimized solar energy systems.While detailed computer-based energy simulations of buildings’energy systems are becoming near-commonplace for many projects,simple,easy-to-use data tables are beneficial earlier in the design process to help guide preliminary decisions in all projects.Practical lookup tables,and then comparison of the data they contain,are also very useful for teaching new concepts,in this case for learning about solar orientations in sunny locations.Engineers,architects,design-build contractors,students,and other designers of green buildings can benefit through knowing,in advance,how exterior surfaces’orientations increase or decrease the total annual solar energy arriving upon those surfaces.For example,maximizing the incoming energy on a particular roof is advantageous for gathering solar energy for heat or for conversion of that sunlight to electricity,but various requirements often limit designers’choices for surfaces’orientations.This paper presents simple tables that form a tool for making initial decisions on surfaces’directions and slopes;the user can then study various effects further,such as local factors including cloudiness and shading,with detailed software.The classical solar geometry equations utilized are documented here for repeatability of the research,but are not necessary for use of this paper’s tables.Practical examples are given too to help readers use the tables.