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Georgios Kokogiannakis - One of the best experts on this subject based on the ideXlab platform.

  • Thermal Comfort Evaluation of a Mixed-mode Ventilated Office Building with Advanced Natural Ventilation and Underfloor air Distribution Systems
    Energy Procedia, 2017
    Co-Authors: Xiang Deng, Georgios Kokogiannakis, Paul Cooper
    Abstract:

    This Study uses field monitoring and post occupancy evaluation (POE) surveys to investigate the indoor thermal comfort of an office Building that is located in subtropical zone. The Building is special as it combines advanced natural ventilation (ANV) strategies and underfloor air distribution (UFAD) systems. A comparison between a static thermal comfort model and a dynamic thermal comfort model is also conducted. The results show that the thermal comfort conditions in the Case Study Building are satisfactory in summer while in winter there is evidence of thermal discomfort. For the Case Study Building, the static thermal comfort model gives outputs that matched well with the responses of the occupants during the POE survey in winter while the dynamic model is more representative of the sensation of the occupants in summer,

  • Numerical analysis of indoor thermal comfort in a cross-ventilated space with top-hung windows
    Energy Procedia, 2017
    Co-Authors: Xiang Deng, Paul Cooper, Georgios Kokogiannakis
    Abstract:

    Abstract: Natural ventilation can be used in residential Buildings in several Australian climatic zones and well-designed windows have the potential to facilitate indoor thermal comfort by allowing occupants to control volumetric outdoor airflow and indoor air velocities. Top-hung window is one of the most popular window types in Australia. This paper investigates the effect of the attributes of top-hung windows (i.e. window length, aspect ratio, height above the ground, window opening angle and the fly screen porosity) and outdoor air conditions (i.e. outdoor air temperature, wind speed and direction) on indoor thermal comfort during cross ventilation using CFD simulations. The Taguchi method was used to design the simulation scenarios and analysis of variance was used to determine the most significant factors influencing thermal comfort optimisation so as to reduce the number of CFD simulation Cases. For the range of parameters considered and a particular Case Study Building, results show that outdoor air temperature, window height and window opening angle are the most important factors influencing indoor thermal comfort in this room. The optimal window configurations for indoor thermal comfort of the Case Study Building are also identified using a signal-to-noise ratio analysis.

Xiang Deng - One of the best experts on this subject based on the ideXlab platform.

  • Thermal Comfort Evaluation of a Mixed-mode Ventilated Office Building with Advanced Natural Ventilation and Underfloor air Distribution Systems
    Energy Procedia, 2017
    Co-Authors: Xiang Deng, Georgios Kokogiannakis, Paul Cooper
    Abstract:

    This Study uses field monitoring and post occupancy evaluation (POE) surveys to investigate the indoor thermal comfort of an office Building that is located in subtropical zone. The Building is special as it combines advanced natural ventilation (ANV) strategies and underfloor air distribution (UFAD) systems. A comparison between a static thermal comfort model and a dynamic thermal comfort model is also conducted. The results show that the thermal comfort conditions in the Case Study Building are satisfactory in summer while in winter there is evidence of thermal discomfort. For the Case Study Building, the static thermal comfort model gives outputs that matched well with the responses of the occupants during the POE survey in winter while the dynamic model is more representative of the sensation of the occupants in summer,

  • Numerical analysis of indoor thermal comfort in a cross-ventilated space with top-hung windows
    Energy Procedia, 2017
    Co-Authors: Xiang Deng, Paul Cooper, Georgios Kokogiannakis
    Abstract:

    Abstract: Natural ventilation can be used in residential Buildings in several Australian climatic zones and well-designed windows have the potential to facilitate indoor thermal comfort by allowing occupants to control volumetric outdoor airflow and indoor air velocities. Top-hung window is one of the most popular window types in Australia. This paper investigates the effect of the attributes of top-hung windows (i.e. window length, aspect ratio, height above the ground, window opening angle and the fly screen porosity) and outdoor air conditions (i.e. outdoor air temperature, wind speed and direction) on indoor thermal comfort during cross ventilation using CFD simulations. The Taguchi method was used to design the simulation scenarios and analysis of variance was used to determine the most significant factors influencing thermal comfort optimisation so as to reduce the number of CFD simulation Cases. For the range of parameters considered and a particular Case Study Building, results show that outdoor air temperature, window height and window opening angle are the most important factors influencing indoor thermal comfort in this room. The optimal window configurations for indoor thermal comfort of the Case Study Building are also identified using a signal-to-noise ratio analysis.

Anna Laura Pisello - One of the best experts on this subject based on the ideXlab platform.

  • Effect of thermochromic coatings on the indoor thermal behavior of a Case Study Building
    E3S Web of Conferences, 2021
    Co-Authors: Claudia Fabiani, Anna Laura Pisello
    Abstract:

    Passive systems and solutions aimed at improving local thermal comfort conditions represent a cutting-edge research field in Building applications. However, only a few investigations were performed by taking into account the local distribution and spatial variability of the airflow generated by the application of both traditional and innovative passive strategies. The present research work is aimed at bridging such gap by modelling the indoor thermal environment of a Case Study prototype Building, i.e. test-room, situated in central Italy, by taking into account the indoor heat transfer phenomena. In particular, a CFD model of the Building is elaborated and used to predict the indoor thermal effect of an adaptive thermochromic envelope, compared to more traditional solutions. The simulation results are post-processed in terms of (i) indoor temperature and (ii) indoor airflows. The main findings confirm a non-negligible and positive impact of the thermochromic Building envelope on the local indoor thermal comfort conditions in both summer and winter conditions, due to its capability of selectively tailor the absorption of heat gains and a function of the local boundary conditions.

  • Thermochromic materials for indoor thermal comfort improvement: Finite difference modeling and validation in a real Case-Study Building
    Applied Energy, 2020
    Co-Authors: Claudia Fabiani, Veronica Lucia Castaldo, Anna Laura Pisello
    Abstract:

    Abstract In recent years, a huge research effort aimed at developing adaptive materials for improving Building indoor thermal comfort has been detected. Yet, only a few analytic and dynamic approaches have been implemented to predict Building materials thermal performance. In this Study, an analytic model is elaborated to evaluate the thermal performance of a well insulated Case Study prototype Building equipped with a thermochromic envelope, and bench-mark it against cool-only and dark-only applications. Therefore, the effect of the selected thermochromic solutions on the indoor environment of the Building in terms of surface and indoor air temperature is evaluated both in summer and winter conditions. Results show that the application of the thermochromic membrane and wall paint represents a win-to-win solution combining the well-established passive cooling effect of high reflectance materials in summer with desirable solar gains produced by dark surfaces in winter. Average indoor air temperature reductions up to 0.2 and 0.5 K were found in summer, while a 0.5 and 0.6 K increase was registered in winter, for the low and high insulation configuration, respectively, when compared to more common dark and cool solution.

Paul Cooper - One of the best experts on this subject based on the ideXlab platform.

  • Thermal Comfort Evaluation of a Mixed-mode Ventilated Office Building with Advanced Natural Ventilation and Underfloor air Distribution Systems
    Energy Procedia, 2017
    Co-Authors: Xiang Deng, Georgios Kokogiannakis, Paul Cooper
    Abstract:

    This Study uses field monitoring and post occupancy evaluation (POE) surveys to investigate the indoor thermal comfort of an office Building that is located in subtropical zone. The Building is special as it combines advanced natural ventilation (ANV) strategies and underfloor air distribution (UFAD) systems. A comparison between a static thermal comfort model and a dynamic thermal comfort model is also conducted. The results show that the thermal comfort conditions in the Case Study Building are satisfactory in summer while in winter there is evidence of thermal discomfort. For the Case Study Building, the static thermal comfort model gives outputs that matched well with the responses of the occupants during the POE survey in winter while the dynamic model is more representative of the sensation of the occupants in summer,

  • Numerical analysis of indoor thermal comfort in a cross-ventilated space with top-hung windows
    Energy Procedia, 2017
    Co-Authors: Xiang Deng, Paul Cooper, Georgios Kokogiannakis
    Abstract:

    Abstract: Natural ventilation can be used in residential Buildings in several Australian climatic zones and well-designed windows have the potential to facilitate indoor thermal comfort by allowing occupants to control volumetric outdoor airflow and indoor air velocities. Top-hung window is one of the most popular window types in Australia. This paper investigates the effect of the attributes of top-hung windows (i.e. window length, aspect ratio, height above the ground, window opening angle and the fly screen porosity) and outdoor air conditions (i.e. outdoor air temperature, wind speed and direction) on indoor thermal comfort during cross ventilation using CFD simulations. The Taguchi method was used to design the simulation scenarios and analysis of variance was used to determine the most significant factors influencing thermal comfort optimisation so as to reduce the number of CFD simulation Cases. For the range of parameters considered and a particular Case Study Building, results show that outdoor air temperature, window height and window opening angle are the most important factors influencing indoor thermal comfort in this room. The optimal window configurations for indoor thermal comfort of the Case Study Building are also identified using a signal-to-noise ratio analysis.

Candice Moy - One of the best experts on this subject based on the ideXlab platform.