The concentrations of ozone, particles (PM10 and PM2.5) and ultra-fine particles were measured duringdriving the automobile and during standing. Two ventilation modes were prepared; 1) all fresh air modeand 2) all re-circulation mode. The windows of the automobile had been always closed during thismeasurement. The indoor/outdoor ratio of the concentrations and the correlation among thosesubstances were reported. The concentrations of particles (PM10 and PM2.5) and ultra-fine particleswere dramatically had been increased while the automobile followed the trailer bus.
Study on existing indoor thermal environment is becoming more and more important for design of theindoor thermal environment and the application of energy-saving technology. In this work the fieldmeasurement of thermal environment in a complex atrium building was conducted and different effectson the indoor thermal environment were analyzed. The atrium is 14m in height. The first floor is forexhibition, and the cooling air can be supplied by air jets located on the upper position of the sidewall.The corridors on the second and third floors are not air conditioned.
The ventilation efficiency of different ventilation patterns inside a room containing one person and officefurniture arranged by different inlet/outlet configurations was investigated. The numerical simulation(CFD) was first adopted to predict air flow pattern and ventilation performance. Then, a laboratoryexperimental measurement at room air distribution in a full-scale test chamber was conducted using thehot wire velocimetry (IFA300) to validate the simulation results.
The main objective of the ongoing research project described in this paper was to study the potential forreducing energy used for ventilating buildings by using low-polluting building materials, withoutcompromising the indoor air quality. To quantify this potential, the exposure-response relationships, i.e.the relationships between ventilation rate and perceived indoor air quality, were established for roomsfurnished with different categories of polluting materials and the simulations of energy used forventilation were carried out.
Recent studies show that improving indoor air quality (IAQ) from the mediocre level prevalent in manybuildings worldwide improves the performance of office work by adults and the performance ofschoolwork by children. These results constitute a strong incentive for providing indoor air of a qualitythat is better than the minimum levels required by present standards.
Ventilation strategies play an important role of enhancing thermal comfort, Indoor Air Quality (IAQ) andenergy conservation in any conditioned space. Introduced in late 90s, Impinging Jet Ventilation (IJV) isthe system that can utilize stratification, while supplying with high velocity. With this characteristic andthe simplicity of its terminal configuration, IJV has an advantage over well-known DisplacementVentilation (DV) system. In this study, IJV system was investigated for establishing the protocol used inComputational Fluid Dynamics (CFD) simulation.
The measuring method of airflow rates of building equipments is important and is required in manystandards, codes, etc. and the committee of the ventilation planning in the building of SHASE (Societyof Heating, Air-conditioning and Sanitary Engineering), Japan is about to propose the standard for TheMeasuring Method of Airflow Rates of Building Equipments. It is aimed to ensure the quality of indoorenvironment and the performance of HVAC system under the situation that the existing methods are inthe variety but less information for the choosing and its feasibility is available.
A task/ambient air-conditioning system with natural ventilation was installed in a high-rise office buildingin Osaka, Japan. This paper will report the results of the field measurements of indoor thermalenvironment and natural ventilation opening performances. From the thermal environmental aspect,the office is properly divided into working task zones and a general ambient zone so as to ensureboth occupants comfort and energy savings. Task air-conditioning is for satisfying individual thermalpreferences by using floor outlets.
This paper presents further developments in a new study of a hybrid ventilation system suitable foruse in domestic buildings or classrooms. Currently the hybrid system is used solely for providing fresh,warm air. The system consists of a wall-mounted convector unit coupled with an extract fan to drawthe air into the convector. Fresh air from outside is tempered by circulating water around an internalheat exchange coil, before it passes into the room. This allows a constant supply of clean, filtered,conditioned air.
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