IBPSA2009

Design of different energy-efficient office buildings in Norway with different energy concepts were studied with a number of different simulation tools. With the help of dynamic computer simulations of energy and indoor environment the impact on energy use and indoor environment was analyzed. A focus was put on a comparison of different simulation tools and their accuracy in predicting the performance in terms of thermal comfort and energy consumption of various cases.  The results show that significant differences in output of the various tools make an objective evaluation difficult.

It is necessary to do research on the heat and moisture transfer in the earth-sheltered building for getting a better underground environment. Based on Philips and De Vries’ and Zhang’s theory (Philip et al., 1957; Zhang et al., 2006), this paper establishes a detailed 2-D transient mathematical model to understand the heat and moisture transfer exactly in the earth-sheltered building envelope and the surrounding soils. A general FEM (Finite Element Method) software is adopted to solve the highly nonlinear governing equations.

Increasing insulation thickness may reduce the energy consumption and environmental load in building operation phase, but may also increase those in insulation production phase. Therefore, the life cycle energy consumption and environmental load of insulation design for a typical residential building were analyzed in this paper. Cases in four typical cities -Harbin, Beijing, Shanghai and Guangzhou- in four different climate zones in China were compared.

Establishing the appropriate measure for estimating and improving the energy performance of a new building is very important at Schematic Design. As an initial attempt toward this end, this research sought to determine at Schematic Design if the designed apartment envelop structure ensured proper energy conservation performance and to develop a support system that could suggest for the envelop structure an improvement measure meeting the targeted energy conservation performance depending on whether or not the calculated value was satisfactory.

The purpose of this study is to propose an optimal design method for the energy system in apartment house using a genetic algorithm and to examine the possibility for the energy conservation of a designed energy system. The energy demand for cooling and heating in apartment house is determined by using TRNSYS. By a modified genetic algorithm called multi-island genetic algorithm, the optimal running pattern of building equipment systems is decided to minimize the energy consumption.

In this paper, the hygrothermal controll material, the interior finishing material with moisture sorption and desorption characteristics containing PCM (Phase Change Material utilizing latent heat), is developed to provide the function of constant temperature and humidity in buildings. The model experiments and the numerical simulation have examined the influence of the hygrothermal controll materials on the indoor environment.

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.