Papers by Keyword: Hybrid Ventilation

Abstract: Aerodynamic quantification of inlet vent flaps in controlled ventilation system. The impact of installed inlet vent flaps in the window structure on the overall aerodynamic properties of conventional triple glazed window and window glazed by the triple glazing with improved acoustic properties. The methodology and results of the measurement.

Abstract: The impact of the installed inlet vent flaps on the window structure on the overall acoustic properties of a conventional triple glazed window and window glazed by the triple glazing with improved acoustic properties. Methodology and results of measurements.

Abstract: Hybrid ventilation is a two-mode system, including mechanical and natural ventilation, which can be used in large space to exhaust excessive heat while minimize energy consumption. One mathematical model is developed to calculate indoor vertical temperature distribution by the hybrid ventilation. Here, the mathematical model is proposed to illustrate the running operation of the hybrid ventilation, especially the control strategies of the natural ventilation in this paper. An experimental and theoretical investigation of natural ventilation in the hybrid system in an atrium building has been conducted. A simplified approach for calculating critical outer temperature and a mathematical model of the natural ventilation in the hybrid system are both proposed in this paper. We have restricted our attention to the natural wind within the upper zone of the large space, in which the effects of the outer air temperature, indoor heat, the natural air rate, and the inlet location of the natural wind are discussed by the mathematical model and experimental data.

Abstract: Take HVAC project of China's Scientific Development Concept Exhibition Hall in Taizhou for example. Based on the rules and requirements of energy saving and using in the Green Building Evaluation Criteria, explore the green building realization model which adopts the low-cost energy saving technology and minimizes the environmental pollution in the entire life cycle of the building. It is desirable that the hall, with a blend of geographical features, be a comfortable, healthy and environment-friendly cultural building of international influence.

Abstract: Hybrid ventilation has significant advantages in building energy-saving. We discussed the potential and influencing factors of the rational use of building hybrid ventilation systems in three typical cities, located in three different climate regions of China. We used the Adapted Comfort Standard (ACS) model and Energyplus software to analyze the hybrid ventilation efficiency. This method combines the advantages of Degree-Hours Method and Heat Balance Method, and also takes into account the wind-driven and buoyancy-driven models. Results shows that the natural ventilation potential (NVP) utilization hours of high thermal insulation buildings with temperature control ventilation can be up to 5080h in Beijing, 6195h in Nanjing and 6726h in Guangzhou, accounting for 58.0%, 70.7% and 76.8% of the full year respectively. It means that the rational use of hybrid ventilation and ventilation mode can significantly reduce building energy consumption in summer.

Abstract: Air quality is very important for classrooms where high density of students study for long time. Enhanced ventilation is an idea way to introduce more fresh air to classroom. Hybrid ventilation combined natural ventilation with mechanical ventilation is a economic way for ventilation improvement. factors Influencing hybrid ventilation such as heat source intensity, location of air inlet, air velocity were studied by simulation in this paper. The characteristics of temperature distribution of the classroom were also analyzed. The simulation research was validated by model experiments. A low position of air inlet in the room makes high temperature efficiency, the optimal value of the air inlet velocity is about 0.5 m/s.

Abstract: In order to improve effect of hybrid ventilation, the paper discussed a solar chimney to enhance natural ventilation. Some factors influencing solar chimney hybrid ventilation in classroom, such as heat sources, air inlet arrangements, air velocity and solar radiation were studied by simulation and validated by experiments. The characteristics of temperature distribution and temperature efficiency in classroom were obtained and analyzed. A low position of air inlet in the room makes high temperature efficiency, the optimal value of the air inlet velocity is about 0.5 m/s. The research provides a better way to enhance hybrid ventilation by solar chimney.

Abstract: In this paper, the simulation software was applied to evaluate a hybrid ventilated combined mechanical and naturally ventilated (atrium area to be naturally ventilated) building. In order to understand the impact of the usage of natural ventilation on thermal comfort in atrium, we utilized TAS to simulate the air temperature and air velocity distribution for the atrium. A modeled three-storey commercial office building was used as the main subject of this analysis. To determine the thermal comfort level of the central atrium, Parameters will be set in such a way that the full height windows will be 100% open. Results were tabularized to determine and analysis the output of the simulation. Recommendations will be then given based on the output performance of the building.

Abstract: This paper introduces the application of the TAS simulation support software to determine the energy performance in between a full mechanical ventilated building than that of a hybrid ventilated-- combined mechanical and naturally ventilated (atrium area to be naturally ventilated) building. A modeled three-storey commercial office building will be used as the main subject of this analysis. To determine the thermal comfort level of the central atrium, Parameters will be set in such a way that the full height windows will be 100% open. Results will be then tabularized to determine and analysis the output of the simulation. Recommendations will be then given based on the output performance of the building. In Tropics, it’s very difficult to achieve better thermal comfort in a naturally ventilated building. With the help of these simulation tools we can find whether natural ventilation is possible in this tropical climate in terms of thermal comfort, ventilation system and energy demand.