Balconies, as one of the main architectural features in subtropical climates, are assumed to enhance the ventilation performance of buildings by redirecting the wind. Although there are some studies on the effect of balconies on natural... more
Balconies, as one of the main architectural features in subtropical climates, are assumed to enhance the ventilation performance of buildings by redirecting the wind. Although there are some studies on the effect of balconies on natural ventilation inside buildings, the majority have been conducted on single zone buildings with simple geometries. The purpose of this study is to explore the effect of balconies on the internal air flow pattern and ventilation performance of multi-storey residential buildings with internal partitions. To this end, a sample residential unit was selected for investigation and three different conditions tested, base case (no balcony), an open balcony and a semi-enclosed balcony. Computational Fluid Dynamics is used as an analysis method due to its accuracy and ability to provide detailed results. The cases are analysed in terms of average velocity, flow uniformity and number of Air Changes per Hour (ACH). The results suggest the introduction of a semi-enclosed balcony into high-rise dwellings improves the average velocity and flow uniformity. Integrating an open balcony results in reduction of the aforementioned parameters at 0° wind incidence.
This experimental study uses a wind tunnel and scale model to investigate turbulence effects on the discharge coefficient and mean flow rate of wind-driven cross-ventilation. The approaching flows include low turbulence smooth flow and... more
This experimental study uses a wind tunnel and scale model to investigate turbulence effects on the discharge coefficient and mean flow rate of wind-driven cross-ventilation. The approaching flows include low turbulence smooth flow and grid-generated turbulent flow. Two different cross-ventilation configurations are considered in this study:(1) two opposite walls, each with one opening, and (2) two adjacent walls, each with one opening. The discharge coefficients of different flow conditions are determined by a fan technique.
When the wind direction is parallel to the opening façade, the wind shear near the building opening generates turbulence and entrains air across the opening. This kind of shear-induced ventilation cannot be predicted by the orifice... more
When the wind direction is parallel to the opening façade, the wind shear near the building opening generates turbulence and entrains air across the opening. This kind of shear-induced ventilation cannot be predicted by the orifice equation because the time-averaged pressure difference across the opening is close to zero. This study uses wind tunnel experiments and the tracer gas decay method to investigate the ventilation rate of shear-induced ventilation.
Since 1996, the provision of a refuge floor has been a mandatory feature for all new tall buildings in Hong Kong. These floors are designed to provide for the building occupants a fire safe environment that is also free from smoke.... more
Since 1996, the provision of a refuge floor has been a mandatory feature for all new tall buildings in Hong Kong. These floors are designed to provide for the building occupants a fire safe environment that is also free from smoke. However, the desired cross ventilation on these floors to achieve the removal of smoke, assumed by the Building Codes of Hong Kong, is still being questioned so that a further scientific study of the wind-induced ventilation of a refuge floor is needed. This paper presents an investigation into this issue. The developed computational technique used in this paper was adopted to study the wind-induced natural ventilation on a refuge floor. The aim of the investigation was to establish whether a refuge floor with a central core and having cross ventilation produced by only two open opposite external side walls on the refuge floor would provide the required protection in all situations taking into account behaviour of wind due to different floor heights, wall boundary conditions and turbulence intensity profiles. The results revealed that natural ventilation can be increased by increasing the floor height provided the wind angle to the building is less than 90 degrees. The effectiveness of the solution was greatly reduced when the wind was blowing at 90 degrees to the refuge floor opening.
Keywords: refuge floor design; wind-induced natural ventilation; high-rise building safety
This study uses wind tunnel experiments to investigate wind-driven cross ventilation in partitioned buildings. The discharge coefficients of internal opening under various flow conditions were determined by a fan technique. It was found... more
This study uses wind tunnel experiments to investigate wind-driven cross ventilation in partitioned buildings. The discharge coefficients of internal opening under various flow conditions were determined by a fan technique. It was found that the internal discharge coefficient is dependent on the internal porosity, but independent of external porosity, and opening location. Based on the experimental results, a predictive model for internal pressure and ventilation rate of multi-room buildings was developed and verified.
A large eddy simulation (LES) model was used to examine the wind-driven cross ventilation of gable-roof greenhouses containing vegetation. The obstruction of air flow by vegetation was described by a porous drag model in the numerical... more
A large eddy simulation (LES) model was used to examine the wind-driven cross ventilation of gable-roof greenhouses containing vegetation. The obstruction of air flow by vegetation was described by a porous drag model in the numerical model, and the simulation results were validated using wind tunnel experiments. The numerical model was then utilised to inspect the influences of vegetation and greenhouse length (in the wind direction) on the ventilation rate. The results revealed that the diminishing effects of the vegetation, insect screen and internal friction on the ventilation rate can all be quantified by a physical-based resistance model. The driving force (the difference between windward and leeward pressures) of long, multi-span greenhouses was found to be less than that of a short, single-span greenhouse leading to a lower ventilation rate. The resistance factor of the vegetation and the insect screen depends on their porosity, while the resistance factor of the internal friction increased as the greenhouse length increased. In addition, the internal friction of multi-span greenhouses should be considered when the length of the greenhouse was greater than six times the greenhouse height.
Natural ventilation solutions can provide sufficient outside air to maintain adequate indoor air quality (IAQ), which can improve occupants’ performance in classrooms and provide reductions in energy consumption for space conditioning. In... more
Natural ventilation solutions can provide sufficient outside air to maintain adequate indoor air quality (IAQ), which can improve occupants’ performance in classrooms and provide reductions in energy consumption for space conditioning. In this study, the effect of cool outside air and the vent opening configurations on IAQ and occupant thermal comfort in naturally ventilated classrooms during the heating season was examined. Dynamic and steady state computer simulations were performed to investigate the internal conditions of a naturally ventilated classroom, designed to meet the requirements of the Priority Schools Building Programme (PSBP) Output Specification. The modelled designs considered natural cross ventilation airflow through high-level top hung-out or bottom hung-in openings, and a stack (atrium). Dynamic thermal modelling results indicate that adequate IAQ and occupant thermal comfort could be achieved using natural ventilation. However, the CFD simulation results predicted occupant discomfort due to draughts in the regions close to the openings. Bottom hung-in vents reduced draught impact and the study also suggests moving occupants away from the draught zones to minimise the effect of discomfort draughts on occupant comfort. The air velocity and airflow patterns in the classrooms were influenced by the shape, size, location of internal openings, and the flowrate through the openings. This could be controlled by introduction of new openings with lower airflow rates through each opening.
In this 1992 study, nine computerized design and analysis tools were compared for their capabilities at modeling cooling loads and seven different passive cooling strategies. Also, a test house was modeled using a rule-of-thumb method, a... more
In this 1992 study, nine computerized design and analysis tools were compared for their capabilities at modeling cooling loads and seven different passive cooling strategies. Also, a test house was modeled using a rule-of-thumb method, a detailed hand calculation method on a computerized spreadsheet, and a computerized hourly thermal network analysis model.
El documento describe puntualmente los avances en dos años de incubación de una microempresa de base tecnológica, ambientalmente amigable, en el giro de deporte y turismo alternativo. Las actividades descritas son MUY diferentes a las... more
El documento describe puntualmente los avances en dos años de incubación de una microempresa de base tecnológica, ambientalmente amigable, en el giro de deporte y turismo alternativo. Las actividades descritas son MUY diferentes a las comunmente realizadas, por ejemplo, en las incubadoras universitarias de empresas. El documento tiene forma de guión de una presentación de avances, efectuado a los superiores de un centro de incubación, por los participantes en el proyecto.
Se presenta memoria fotográfica de 7 años (2010-2016) de avances en el proyecto de construcción, centrada en ahorro y uso eficiente de energía de un pequeño inmueble de tres departamentos tipo estudio loft en la colonia Barrio Bravo,... more
Se presenta memoria fotográfica de 7 años (2010-2016) de avances en el proyecto de construcción, centrada en ahorro y uso eficiente de energía de un pequeño inmueble de tres departamentos tipo estudio loft en la colonia Barrio Bravo, ciudad de Chetumal.
Ing(c) Ricardo Xavier Gamboa Rocha, Director de Proyecto
Inicio: 2 de enero del 2010. Corte de avances al 16 de noviembre del 2016. Ubicación: Dos lotes contiguüos en Calle Isla Contoy Nos. 139 y 139A (X Ave Lázaro Cárdenas y Ave Chapultepec), Col BarrioBravo, CP 77058, Chetumal, Quintana Roo
Actividades contempladas, por realizar: Interconexión con red CFE, almacenamiento y uso agua lluvia, permacultura en área actualmente jardinada.
El recibo se refiere al monto monetario erogado por el Gobierno del Estado de Quintana Roo, por mejora en la Clínica No. 2 de primer nivel de atención, operada en la ciudad de Chetumal por su Secretaría de Salud. El documento forma... more
El recibo se refiere al monto monetario erogado por el Gobierno del Estado de Quintana Roo, por mejora en la Clínica No. 2 de primer nivel de atención, operada en la ciudad de Chetumal por su Secretaría de Salud. El documento forma parte de la carpeta-antología de materiales de apoyo al entrenamiento, sobre el trabajo ("on the job training"), para la administración de proyectos de mejora tecnológica en el campo de ahorro y uso eficiente de energías. Se presenta desglose de conceptos de mejoras infraestructurales realizadas, con respectivos costos (Pesos mexicanos de 14 de marzo del 2007)
El proyecto persigue renovar veleros, adecuar infraestructura y equipo en un predio particular de la zona urbana y renovar desembarcaderos rústicos ejidales del poblado de Raudales, para que en seis meses 2 ejidatarios empiecen a operar... more
El proyecto persigue renovar veleros, adecuar infraestructura y equipo en un predio particular de la zona urbana y renovar desembarcaderos rústicos ejidales del poblado de Raudales, para que en seis meses 2 ejidatarios empiecen a operar comercialmente, en embarcaciones propias, el servicio de velerismo socialmente responsable, en el destino de turismo alternativo denominado Corredor Turístico Laguna Guerrero, Municipio de Othón P. Blanco, estado de Quintana Roo.
El modelo que se presenta ha sido construido, probado y validado en el caso de del primer bimestre de avance en las obras de rehabilitación de seis clinicas de atención primaria a la salud en la ciudad de tamaño intermedio de Chetumal,... more
El modelo que se presenta ha sido construido, probado y validado en el caso de del primer bimestre de avance en las obras de rehabilitación de seis clinicas de atención primaria a la salud en la ciudad de tamaño intermedio de Chetumal, Quintana Roo, México.
El proyecto inició el 10 de junio del 2007 y el corte del primer bimestre ocurrió eal 6 de agosto del mismo año. Rehabilitaciones puntuales estaban siendo llevadas a cabo en los Centros de Salud Urbana (CSU) de Chetumal: CSU #1 Solidaridad, CSU #2 Heriberto Frías, CSU #3 Bugambilias, CSU #4 Aarón Merino, CSU #6 Guadalupe Victoria, CSU #7 Payo Obispo. La empresa contratada para la ejecución del paquete de obras, Visión EnerGtiK S. de R.L. MI (VEN), confeccionó un programa amigable que permite llevar control electrónico del grado de avance en cada frente y rubro autorizado.
Se presenta la memoria fotográfica de avances de una década (2006-2016) de ejecución puntual, del proyecto de ahorro y uso eficiente de energia para vivienda unifamiliar del subrópico Húmedo realizado por Visión EnerGtiK S de RL MI. Las... more
Se presenta la memoria fotográfica de avances de una década (2006-2016) de ejecución puntual, del proyecto de ahorro y uso eficiente de energia para vivienda unifamiliar del subrópico Húmedo realizado por Visión EnerGtiK S de RL MI. Las 37 paginas del documento se refiere a la aplicación del proyecto en el caso de un inmueble unifamiliar, privado, que se ubica en el Fraccionamiento Framboyanes, Chetumal, Quintana Roo, México
Ing(c) Ricardo Xavier Gamboa Rocha, Director de Proyecto
Inicio: 3 de septiembre del 2006. 12 acciones exitosamente concluídas en 10 años de ejecución del proyecto. Actividades contempladas, por realizar: Interconexión con red CFE, almacenamiento y uso agua lluvia, permacultura en techo.
