A Proposal of Hybrid Ventilation System Using Stack Effect in High-rise Buildings

This study proposes the hybrid ventilation system and its design methods for high-rise buildings. The proposed hybrid ventilation system uses natural driving power for ventilation based on air flow in the whole building and indoor and outdoor pressure distributions. Furthermore, it solves the troubles of the conventional natural or mechanical ventilation systems. This paper presents theories and a process for duct design for natural ventilation which forms the basis of a hybrid ventilation system in high-rise buildings.

CFD Analysis on Capture Efficiency in Commercial Kitchen using Low Radiative Cooking Equipment with Concentrated Exhaust Chimney

In a commercial kitchen, a large ventilation rate is needed and energy consumption can be large because a large amount of effluence of heat and moisture need to be removed. To improve kitchen environment and to save the energy, low radiative cooking equipment with concentrated exhaust chimney was developed. Although a ventilation rate may be decreased by using this equipment, the effluence needs to be captured well. To predict indoor air and thermal environment of commercial kitchen using this equipment, CFD analysis is useful.

Influence of Partition Curtain on Vertical Profile of Temperature and Contaminant Concentration in Sickroom with Displacement Ventilation

For patients, the sickroom is a place where they receive medical treatment and also a living space where they spend most of time in a day. Therefore, good indoor air quality and comfort should be kept in sickroom. We propose to use the displacement ventilation as a means of obtaining high indoor air quality in sickrooms. The purpose of the study is to examine the validity of this system. This paper shows the experiment results and CFD analysis results to examine the effect of partition curtain in the displacement-ventilated room.

Prediction of Plume above Residential Cooking Range by means of CFD analysis

Recently, Island kitchen is installed in many houses in Japan. In the island kitchen, the cooking range is placed on the island unit, and the center hood is located above the cooking flow in the room. In such a kitchen environment, there is a possibility that cross winds or other disturbing flow may reach the cooking zone. For this reason, pollutant fumes from the cooking range may be diffused to residential zone. CFD analysis is an effective measure for comprehending such a diffusion of the thermal plume.

Performances of new innovative domestic ventilation systems in combination with low temperature floor heating

In extended laboratory measurements, the combination of new innovative domestic ventilation systems with low temperature heating is investigated, using the advanced EnoTemp measurement equipment. These measurements took place in the framework of a large Dutch demonstration project for these innovative domestic ventilation systems. The main conclusion of the laboratory measurements is that self-regulating façade grilles form a good combination with low temperature heating in terms of thermal comfort.

The effect of ventilation rates and window areas on building energy use

Natural ventilation is an effective method for energy conservation while potentially improving indoor air quality. Furthermore, a window has a significant impact on energy consumption. The purpose of this study is to reduce building energy use by changing ventilation rates and window areas. We analyzed the energy consumption and CO2 emissions according to ventilation rates and window areas through using a computer program, HEED 3.0. The reference model had two windows of 1.2m×1.5m, and assumed there was no ventilation except for the minimum ventilation rate of 0.35 ACH.

Study of cross- ventilated indoor air flow characteristics by frequency analysis

In Japan where is located at the hot humid climate region, houses have been built considered hot summer life from ancient times. It is said that comfortable and cool feelings by cross-ventilation were more important. However, the characteristics of cross-ventilated air flow are unclear, and that it has yet to be revealed how they affect the psychological and physiological factors that influence comfortable feeling. So, in this study, time-series data of cross-ventilated indoor air flow velocity were measured by field measurement at the actual detached house in Japan.

Thermal Environment Generated by Occupant’s Opening Control of Window at Naturally Ventilated Building

A field survey in a natural ventilated school building was carried out. The purpose of this study is to figure out the occupant’s evaluation of thermal comfort as the result of opening control, which seems to be affected by the outdoor and indoor air condition.

Experimental Investigation and Accuracy Study of CFD Analysis for Airflow around Cross-Ventilated Building

In predicting flow rate of a building ventilated by wind, the orifice equation is usually used. This conventional method cannot work for the building provided with large openings. Therefore, the final goal of this study is to establish a new prediction method of the cross-ventilation rate, which is based on energy balance inside the stream tubes passing through/around a building. In determining stream tubes, it is beneficial to use CFD. In this study, the accuracy of CFD analysis is studied. Three turbulence models are used in the simulation; i.e.

Adaptation process of human olfactory under continues exposure to odor of ethyl acetate based on subjective estimation of odor intensity

This study was aimed at making a model which predicted olfactory sensation. Firstly, it was conducted the experiment, which odor was exposed to subjects constantly and subjects evaluated odor, to investigate the olfactory adaptation process. As a result, it was turned out odor intensity decreasing exponentially as time. Secondly, validity of the previous theoretical model ( Osako,1991 ) was investigated by comparing the evaluation.