Energy conservation is one of the key issues for environmental protection and sustainabledevelopment. Currently, about 17% of the total energy is being consumed for heating, ventilation, airconditioning (HVAC) and refrigeration in Hong Kong. Therefore, energy saving in the HVAC systemsof buildings is an important topic. In this paper, a study on the energy saving in a hotel HVAC systemwas carried out. The cooling load features of the hotel were analyzed. Retrofitting strategy of theHVAC system in the hotel was then designed.

A group of 2-story detached houses is built next to a river stretching from south to north. There aremore than hundreds of houses, called the riverside townhouses in this study, in the construction site. Acoupled simulation of convection, radiation and conduction is conducted to evaluate the outdoorthermal environment from the viewpoint of building arrangement. According to the real weather data,two different wind directions (SSE and ENE) are examined.

This study presents a multi-objective optimum design method for reliable indoor humidity environmentsbased on the appropriate use of moisture-conditioning materials. In this paper, (1) a transient predictionof indoor air temperature and humidity in a model living room is developed by employing indices for thecontribution ratio of indoor climate (CRI(C)) and contribution ratio of indoor humidity (CRI(H)), and (2) anoptimal design method is developed using multi-objective genetic algorithms (MOGA) and the transientprediction above.

A successful Indoor Air Quality (IAQ) surveillance plan is essential for healthy and safe workplaces;yet it is costly to sample all air pollutants of the entire community. In Hong Kong, a voluntary IAQcertification scheme for workplaces proposes the acceptable concentration levels of nine commonindoor air pollutants, namely carbon dioxide (CO2), carbon monoxide (CO), respirable suspendedparticulates (RSP), nitrogen dioxide (NO2), ozone (O3), formaldehyde (HCHO), total volatile organiccompounds (TVOC), radon (Rn) and airborne bacteria count (ABC).

By natural ventilation, the air rate varies randomly. Therefore, it is difficult to evaluate the naturalventilation performance due to insufficient measured data. In the present work a complex office buildingwas taken as a study object for the experimental investigation. A measurement technology isdeveloped in this work for the assessment of the natural ventilation performance in the building.

The distribution of indoor airflow velocity by cross ventilation is influenced by the regional climateconditions, and the location as well as the shape of the building. In this study, CVDHI of 25 cases tochange the number and position of openings at 842 cities in Japan are calculated for the simple housemodel. The results indicate that CVDHI increases relatively in every case from the south to the north ofJapan.

This study aims to understand chemical air pollution and its influence on students and staff in auniversity building that had been under renovation for 2 years. Occupants had to move into their newrooms immediately after the renovation work was completed and so could have been exposed tochemical pollutants emitted from architectural materials.We conducted chamber testing to obtain chemical emission rates from interior use materials; whichwere the ones used for the actual work in the university building.

Much of the analysis of the potential to save energy and reduce emissions of greenhouse gases in thebuildings sector has focused on the energy savings that can be achieved through incrementalimprovements in the efficiency of individual energy-using devices (motors, fans, pumps, boilers,chillers) but without changing the way in which they are put together as systems. However, muchlarger savings are possible through changes in building systems, and further, these savings can beachieved at much smaller incremental investment cost and sometimes at lower first cost.

In 2002, the indoor environment and occupant health of approximately 800 residential buildings wereinvestigated by a questionnaire. As a result, the actual conditions of the indoor thermal environmentand the indoor air quality have been clarified, and several problems related to dampness in buildings,have been grasped. This report focuses on child health problems related to the indoor environment,especially dampness.

In this study, five different types of smoking spaces and non-smoking spaces were investigated in orderto discuss about tobacco odor leakage from smoking area. VVOCs, VOCs and aledehydes wereanalyzed for characterization of odor. Additionally, the isolation result has been identified bydetermining ETS markers (nicotine and 3-ethenylpridine) based on ISO1845.Determined compounds were quantified and categorized into 13 groups, concentration between thesmoking space and non-smoking space was compared. In the most case, the concentration innon-smoking space was lower than smoking space.