The Experts below are selected from a list of 85716 Experts worldwide ranked by ideXlab platform
Kenan Gocer - One of the best experts on this subject based on the ideXlab platform.
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spatial mapping of occupant satisfaction and Indoor Environment quality in a leed platinum campus building
Building and Environment, 2014Co-Authors: Ozgur Gocer, Kenan GocerAbstract:Abstract This paper reports a post-occupancy evaluation study of a LEED Platinum building on a university campus. A multiple-tool POE approach with GIS-based spatial mapping method was used to analyze and visualize the survey results of building occupant satisfaction and the measured Indoor Environment quality. The occupants were overall satisfied with the Indoor Environment in their workspaces in the building of study, though thermal comfort was comparatively low with high percentage of occupants reporting their workspaces too cold. Air movement was found to be lower than preferred by the occupants, especially in interior offices where CO 2 level was also predominantly higher. Light levels in the building were found higher than preferred. Electric lighting power density installed did not reflect the fact that daylight is available for most of the lab and office spaces. Satisfaction with speech privacy was found lower in individual offices related to the construction detail of the connection between curtain wall and interior walls. Linking performance outcomes with spatial information improves POE data management. Spatial mapping allows reasons that cause occupant discomfort and dissatisfactory measured performance to be identified more intuitively and makes it potentially easier to communicate POE results with architects, engineers and facility management professionals, in order to engage them in the collaborative effort of continuous building performance improvement.
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spatial mapping of occupant satisfaction and Indoor Environment quality in a leed platinum campus building
Building and Environment, 2014Co-Authors: Ozgur Gocer, Kenan GocerAbstract:Abstract This paper reports a post-occupancy evaluation study of a LEED Platinum building on a university campus. A multiple-tool POE approach with GIS-based spatial mapping method was used to analyze and visualize the survey results of building occupant satisfaction and the measured Indoor Environment quality. The occupants were overall satisfied with the Indoor Environment in their workspaces in the building of study, though thermal comfort was comparatively low with high percentage of occupants reporting their workspaces too cold. Air movement was found to be lower than preferred by the occupants, especially in interior offices where CO 2 level was also predominantly higher. Light levels in the building were found higher than preferred. Electric lighting power density installed did not reflect the fact that daylight is available for most of the lab and office spaces. Satisfaction with speech privacy was found lower in individual offices related to the construction detail of the connection between curtain wall and interior walls. Linking performance outcomes with spatial information improves POE data management. Spatial mapping allows reasons that cause occupant discomfort and dissatisfactory measured performance to be identified more intuitively and makes it potentially easier to communicate POE results with architects, engineers and facility management professionals, in order to engage them in the collaborative effort of continuous building performance improvement.
Ozgur Gocer - One of the best experts on this subject based on the ideXlab platform.
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spatial mapping of occupant satisfaction and Indoor Environment quality in a leed platinum campus building
Building and Environment, 2014Co-Authors: Ozgur Gocer, Kenan GocerAbstract:Abstract This paper reports a post-occupancy evaluation study of a LEED Platinum building on a university campus. A multiple-tool POE approach with GIS-based spatial mapping method was used to analyze and visualize the survey results of building occupant satisfaction and the measured Indoor Environment quality. The occupants were overall satisfied with the Indoor Environment in their workspaces in the building of study, though thermal comfort was comparatively low with high percentage of occupants reporting their workspaces too cold. Air movement was found to be lower than preferred by the occupants, especially in interior offices where CO 2 level was also predominantly higher. Light levels in the building were found higher than preferred. Electric lighting power density installed did not reflect the fact that daylight is available for most of the lab and office spaces. Satisfaction with speech privacy was found lower in individual offices related to the construction detail of the connection between curtain wall and interior walls. Linking performance outcomes with spatial information improves POE data management. Spatial mapping allows reasons that cause occupant discomfort and dissatisfactory measured performance to be identified more intuitively and makes it potentially easier to communicate POE results with architects, engineers and facility management professionals, in order to engage them in the collaborative effort of continuous building performance improvement.
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spatial mapping of occupant satisfaction and Indoor Environment quality in a leed platinum campus building
Building and Environment, 2014Co-Authors: Ozgur Gocer, Kenan GocerAbstract:Abstract This paper reports a post-occupancy evaluation study of a LEED Platinum building on a university campus. A multiple-tool POE approach with GIS-based spatial mapping method was used to analyze and visualize the survey results of building occupant satisfaction and the measured Indoor Environment quality. The occupants were overall satisfied with the Indoor Environment in their workspaces in the building of study, though thermal comfort was comparatively low with high percentage of occupants reporting their workspaces too cold. Air movement was found to be lower than preferred by the occupants, especially in interior offices where CO 2 level was also predominantly higher. Light levels in the building were found higher than preferred. Electric lighting power density installed did not reflect the fact that daylight is available for most of the lab and office spaces. Satisfaction with speech privacy was found lower in individual offices related to the construction detail of the connection between curtain wall and interior walls. Linking performance outcomes with spatial information improves POE data management. Spatial mapping allows reasons that cause occupant discomfort and dissatisfactory measured performance to be identified more intuitively and makes it potentially easier to communicate POE results with architects, engineers and facility management professionals, in order to engage them in the collaborative effort of continuous building performance improvement.
Ravihansa Chandratilake - One of the best experts on this subject based on the ideXlab platform.
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Indoor Environment quality of green buildings: Case study of an LEED platinum certified factory in a warm humid tropical climate
Building and Environment, 2015Co-Authors: Sachinthaka Ravindu, Jian Zuo, Raufdeen Rameezdeen, Zhihua Zhou, Ravihansa ChandratilakeAbstract:The Indoor Environmental quality of a green building is expected to be better, more comfortable and more productive compared to a conventional building. Many studies have been undertaken on user satisfaction of green buildings. However, most of them placed focuses on office buildings in developed countries and temperate climates. Very few studies have been conducted on other types of buildings in developing countries and tropical climate zones. The research reported in this paper aims to investigate the Indoor Environment quality of a green factory building in a developing country with a warm humid tropical climate. Using a conventional factory as a control, a questionnaire survey was administered among pairs of comparable workers using a Systematic Sampling Technique. Physical measurements of several Indoor Environment quality variables in similar locations provided an opportunity to corroborate the survey responses. Results showed that thermal comfort, ventilation, and ability to control Indoor Environment of the green factory were comparatively less satisfactory. Acoustics, Indoor air quality and work layout did not indicate a significant difference between the factories. Views to outside, lighting, cleanliness, furniture, and privacy were better in the green factory compared to the control. The study explored the reasons for poor rating of some of the green factory's Indoor Environment quality variables. This study confirms the need for green buildings to have a climate responsive design that is locally relevant.
Bahram Moshfegh - One of the best experts on this subject based on the ideXlab platform.
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Energy use and perceived Indoor Environment in a Swedish multifamily building before and after major renovation
Sustainability (Switzerland), 2018Co-Authors: Lina La Fleur, Patrik Rohdin, Bahram MoshfeghAbstract:Improved energy efficiency in the building sector is a central goal in the European Union and renovation of buildings can significantly improve both energy efficiency and Indoor Environment. This paper studies the perception of Indoor Environment, modelled Indoor climate and heat demand in a building before and after major renovation. The building was constructed in 1961 and renovated in 2014. Insulation of the façade and attic and new windows reduced average U-value from 0.54 to 0.29 W/m2·K. A supply and exhaust ventilation system with heat recovery replaced the old exhaust ventilation. Heat demand was reduced by 44% and maximum supplied heating power was reduced by 38.5%. An on-site questionnaire indicates that perceived thermal comfort improved after the renovation, and the predicted percentage dissatisfied is reduced from 23% to 14% during the heating season. Overall experience with Indoor Environment is improved. A sensitivity analysis indicates that there is a compromise between thermal comfort and energy use in relation to window solar heat gain, internal heat generation and Indoor temperature set point. Higher heat gains, although reducing energy use, can cause problems with high Indoor temperatures, and higher Indoor temperature might increase thermal comfort during heating season but significantly increases energy use.
Qingyan Chen - One of the best experts on this subject based on the ideXlab platform.
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optimal design of an Indoor Environment by the cfd based adjoint method with area constrained topology and cluster analysis
Building and Environment, 2018Co-Authors: Xingwang Zhao, Wei Liu, Dayi Lai, Qingyan ChenAbstract:Abstract An Indoor Environment should be designed to provide occupants with a desirable level of thermal comfort and air quality. The optimal design of an Indoor Environment can be achieved by using the computational fluid dynamics (CFD)-based adjoint method to determine the size, locations, and shape of air supply inlets, and the air supply parameters (i.e., velocity, temperature, and angle). However, the optimal design may involve a large number of air supply inlets, which would be impractical to implement. This investigation developed an area-constrained topology and cluster analysis to consolidate multiple air supply inlets into a limited number and to determine their size and locations. The desired Indoor Environment can be maintained by further optimizing the air supply inlet shape and parameters. This investigation demonstrated the method's capability by applying it to a two-person office and a single-aisle, fully-occupied aircraft cabin. The optimal thermal comfort conditions around the occupants can be achieved with a limited number of air supply inlets at appropriate locations.
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coupled simulation of Indoor Environment hvac and control system by using fast fluid dynamics and the modelica buildings library
2014 ASHRAE IBPSA-USA Building Simulation Conference, 2014Co-Authors: Michael Wetter, Dan Li, Wei Tian, Qingyan ChenAbstract:Ventilation with stratified air distributions is used to reduce building energy consumption while improving the Indoor Environment quality. This paper describes the coupling of transient simulations of HVAC systems and Indoor Environments that can be used for the HVAC control of Indoor Environments with stratified air. The Indoor Environment was simulated using a fast fluid dynamics (FFD) simulation program. The building fabric heat transfer, HVAC and control system were modeled using the Modelica Buildings library. After presenting the concepts and mathematical algorithms for the coupled simulation, two numerical examples of ventilation with natural convection and mixed convection in a single-room building are provided for validation and demonstration. Further research and development needs are also discussed.
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a procedure for verification validation and reporting of Indoor Environment cfd analyses
Hvac&r Research, 2002Co-Authors: Qingyan Chen, Jelena SrebricAbstract:Computational fluid dynamics (CFD) has been used to determine the airflow, heat transfer, and chemical species transport in the analysis of Indoor Environmental conditions as well as a wide range of other HVAC&R applications. The decision to use CFD must be firmly based on realistic expectations of its performance, cost, and effort required. Instructive materials are needed on how to verify, validate, and report Indoor Environmental CFD analyses. A CFD code for Indoor Environment modeling needs to be verified and validated based on the following aspects: basic flow and heat transfer features, turbulence models, auxiliary heat transfer and flow models, numerical methods, and assessment of predictions. All of these important aspects are described and discussed in this paper.
