IBPSA2007

Cyclone purifier has been conventionally used for separating particles from exhaustion. This paper, however, tried to develop a cyclone purifier for fresh air treatment in ventilation. Simulations were carried out based on continuity equation, momentum equation, RNG k-epsilon turbulent flow equation and Discrete Phase Model; the discrete griddings were both structural and non-structural; the software used was FLUENT. The separation efficiencies, pressure drops and the flow patterns of air in the cyclone purifier were simulated.

According to the cold climate in winter, a new novel ventilation system was put forward based on the analysis of the heat distribution at the subway station in Harbin. There was no special heating system in winter for subway station with such a ventilation system. In this paper, three dimensional model of the subway station was built, a mathematical model of the novel ventilation system was developed based on the k-ε standard turbulence model, and computational fluid dynamics (CFD) simulations for the ventilation system were performed to clarify the conditions of the temperature fields.

As a comfortable and energy-efficient air conditioning system, the application of radiant floor heating system is increasing greatly used in the north of China. Now, more and more people begin to be aware of the problem of thermal comfort degree in radiant floor cooling room. This study aims at developing a radiant floor cooling system using the existing radiant floor heating system. Unlike an all-air cooling system, the radiant floor cooling system could remove the cooling by convection and radiation.

Urban issues to be resolved concerning building energy systems involve not only global warming but also the heat island phenomenon, the planning of urban infrastructures for electricity generation and distribution, and water purification.

A mathematical model has been developed for simulating the performance of small-scale fuel-cell cogeneration systems. An experimental programme has been conducted to calibrate the model (i.e. establish its inputs) to simulate the performance of a prototype solid-oxide fuel-cell system. Data from a disjunct set of experiments were used to empirically validate this model and its calibration.

The systematic numerical simulation program is developed to calculate the total energy efficiency of housing polymer electrolyte fuel cell co-generation system (PEFC-CGS) which is combined with hot water floor heating (HWFH). This simulation program can also predict actual building physics of heat transfer such as mutual radiant heat among interior surfaces and thermal strage relating with piping pitch of hot water and so on. The indoor temperature can be controlled by PMV (Predicted Mean Vote) to take account of thermal sensing affected radiant heat.

The air barrier technique is to apply the special airflow through window fan to improve the thermal environment near the windows in winter and summer, and especially in winter, to simplify the air conditioning system of perimeter zone of office building and avoid condensation on the surface of window. By using numerical simulation, the paper analyzed the thermal environment of the office building, both applied the air barrier technique or not. The paper also compared the two different methods in winter and summer respectably.

In this study, a new optimal design method for buildings and urban energy systems is proposed. Also its applicability is analyzed through a simple case study. Multi Island Genetic Algorithms (MIGA) are adopted for this optimization. This method has two optimization steps, selection of equipment capacity and selection of system operational planning. These optimization steps are calculated simultaneously. The results showed that the proposed method has the potential to be applied to very complex energy systems and achieve significant improvements.

Meteorological data set for China building thermal environment analysis has been developed by Climatic Data Center of China Meteorological Administration and Tsinghua University. The data set is based on observation meteorological data and provides hourly climate data for dynamic simulation. This paper introduces (1) source data of the data set; (2) the methodology used to get the hourly data based on the observation time-lapse data and daily data; (3) the select method of typical meteorological year and different typical years for design.

Using solar thermal energy is an interesting option for heat driven air conditioning e.g. desiccant cooling, but it is very important to know with which efficiency this renewable energy is used. In this paper a solar installation of direct flow vacuum tube collectors dedicated for desiccant cooling is investigated. First a model of the mentioned collectors is presented and implemented into the simulation environment SPARK then it is validated experimentally. After, simulations of autonomous operations are run and the global efficiency is calculated.