English

Longitudinal ventilation systems are commonly installed in new tunnels in big cities of the Far Eastincluding Mainland China, Hong Kong and Taiwan. Many tunnels are found and some of them areinclined at an angle to the horizontal. However, smoke movement in those tilted tunnels is not fullyunderstood. Some longitudinal ventilation was designed based on presumed smoke movementpattern without experimental demonstration.Smoke movement pattern in a tilted tunnel model was studied by scale modeling technique.

This work examines the applicability of comfort criteria, based on a heat balance model and on anadaptive model, in naturally ventilated classrooms. The adaptive opportunity of students are limitedduring the lesson time, while they are free during the lesson breaks. The field study was conducted byphysical observations, survey questionnaires and behavioral observations. Both field measurementsand subjective surveys were performed at the same time during the regular lesson period.

The indoor air quality management of the public places is gaining wide attention in Korea, because theindoor air quality of the public places are obliged to satisfy the guidelines suggested by Korean Ministryof Environment. According to this regulation, the railroad stations are regarded as public places whilethe passenger cabin of train is excluded. However, because the passengers spend more time in thepassenger cabin than in the stations, the indoor air quality management of the passenger cabin is moreimportant.

This work deals with the evaluation of the performances of phase change materials (PCMs) coupledwith a ventilated ceiling system in order to reduce summer cooling loads and improve the internalcomfort in buildings, thus enhancing the positive effect of night ventilation.Object of the study is the numerical simulation of the thermal behaviour of a typical open space officelocated in three Italian cities during the summer. Indoor climate is only controlled by means of passiveventilation; a usual ventilation system configuration (i.e.

The paper reports the first results of research carried out at the Department of Design and BuildingConstruction of the University of Palermo analysing the problems related to the design of sustainablebuilding envelopes in the Mediterranean Basin. The paper shows the design strategies adopted by agroup of students in their graduation thesis on the recovery of Mazara del Vallo city hall in order toinvestigate the issue of existing buildings and sustainability.

The paper describes the numerical simulation of a novel ventilation cooling system. The ultimate aimof the mathematical model is to facilitate the design of the system for specific buildings and climates.The model directly takes account of time dependency in that the diffusion equation for the heat flow inthe fabric of the room is solved. This approach means that important parameters (e.g. ventilationrates and internal heat gains) can be arbitrarily specified as functions of time.

The buildings sector offers the greatest potential for cost-effective reductions in greenhouse gasemissions out of all the sectors examined by the Intergovernmental Panel on Climate Change.However that potential was based purely on technical measures applied to existing buildings and newconstruction. It is becoming increasingly clear that non-technical options involving building occupantcomfort, culture and behaviour will also need to be implemented in order to stabilise atmosphericconcentrations of CO2 within a useful timeframe.

When a building is used only for intermittent occupancy, continuous operation of ventilation system isnot necessary for achieving good indoor air quality during the occupation periods. Such buildings havea great energy saving potential which is not harnessed enough yet. Indeed, energy loss can be avoidedby promoting natural means and managing mechanical ones.

In hot and humid climates, desiccant air-conditioning systems have been suggested as suitable forimproving Indoor Air Quality (IAQ). Generally as dehumidification devices, various types of silica gelrotor have been used to control humidity.

Recently, products of chemical reaction have been at issue as the topic of research on Indoor AirQuality. In this study, the emission mechanism of 2-ethyl-1-hexanol (2E1H) is studied. It has beenreported that 2E1H at high concentrations is measured in indoor air over the long term. The emissionmechanism for 2E1H is considered that water with high pH in concrete slabs and self-leveling sub-floormaterial reacts to di-2-ethylhexyl phthalate (DEHP) in PVC flooring and compounds containing the2-ethyl-1-hexyl group in the adhesive.