English

In this paper, eight ventilation strategies in a typical apartment floor plan in Jeju, Korea were studied. In terms of size and floor plan, the chosen building is typical of residential buildings and consists of three bedrooms, a living room, and a kitchen. In this study, uncertainty propagation was introduced to treat the parameters which are not “deterministic” but “probabilistic” such as the stochastic nature of weather, the occupants’ behavior, building components, and simulation parameters.

This paper addresses the optimal design of residential ventilation systems in an apartment floor plan in Korea. The term “optimal design” refers to the selection of a ventilation method (mechanical, hybrid), type of heat recovery (total, sensible only), outdoor airflow rate, and the optimal sizing and location of supply diffusers/exhaust registers. Decision-making criteria include initial and operation costs, indoor air quality, energy use, and comfort.

Natural light is irreplaceable because it is a full-spectrum light, it changes during the day and it is different every day of the year. A variable illumination throughout the day, in terms of intensity and colour temperature, creates dynamic indoor environments that are more pleasant for people. Daylight needs to be controlled, especially in office buildings, to avoid discomfort glare and high luminance reflections on display screens, to provide a good lighting level even in the deeper part of a room and to reduce cooling loads.

This paper reports a modelling study on quantitative assessment of economical benefits of three low energy solutions that could be easily applied to a large number of office buildings in the delta area of Yangtze River, where climate is characterised as hot summer and cold winter. The solutions include solar shading plus fabric insulation, sufficiently use of natural ventilation, and combination of these two.

Advanced façade systems such as double skin facades are increasingly common. However, evaluation of performance in terms of energy and comfort is not always possible. Limitations and constraints of current design tools lead to the introduction of a number of necessary simplifying assumptions. In-depth understanding of both software tools and the function and the performance of double skin façade systems are essential in solving these problems. The paper presents a case study and starts to develop a methodology for establishing an appropriate correlation.

Orthonormal Basis Functions (OBF) is a structure of dynamic models that have been applied in different classes of dynamic systems. Several works describing the theory and applicability of OBF (Orthonormal Basis Functions) in identification and control can be found in the literature. This work is focused on the problem of finding a Multiple-Input/Single-Output (MISO) OBF model for predicting indoor air temperature and energy consumption. The aim is to analyse an alternative way to do so in relation to well established building energy simulation tools.

Effects of differences in a town’s configuration and the building surface components on urban warming were investigated. One of the most traditional and now urbanized districts in Osaka was selected as the objective. The CFD model was developed for the present district and has verified by measurement in the former study. Surface temperatures were used as boundary conditions and the air temperature distributions were simulated. Surface temperatures of the wooden and soil walls were measured in another district those building materials were similar to those in 1917.

The knowledge of the local loss coefficients is important for the accurate calculation of ventilation duct pressure loss. In practice, the pressure loss of ventilation duct is very often forecasted, what causes the wrong design of the ventilating fan. A large number of local loss coefficients exist, but the published data are different. The local loss coefficient can be estimated experimentally by the measurement on the real model, or with using of numerical simulation.

Cooling energy refurbishment of buildings can be achieved by coating the outdoor walls with paints that have high solar reflectance (0.3-2.5µm) and high thermal emittance (4-80µm). In this presentation, the thermal performance of some paints is studied through an outdoor experiment. In a second part, the inwards conductive flux for a non-insulated wall is modelled with a premise energy budget’s module.

Presented work is devoted to numerical analysis of wind flow in vicinity of recently renovated historical building. The analysed building is a part of larger old post industrial complex transformed into cultural centre. The original building was completely exposed to external climatic factors. During the recent modernization, the new buildings were built around the existing one forming external, narrow corridors.