| Building energy consumption amounts to about one third of our nation's primary energy. Generally, about 30% to 60% of the building energy is consumed in air-conditioning systems. Building energy simulation, especially for air-conditioning systems has great contribution to building energy conservation.The concept of integrated building energy simulation is described, the function of each module in the integrated system is presented, and the PP (primitive parts)-based dynamic simulation technique for air-conditioning system is discussed. The combined simulation matrix of a finite number of primitive parts is deduced by the finite difference control volume conservation method and interaction principle, based on the fundamental physical laws. By primitive parts and auto-connection technique, appropriate combinations can be constructed to meet different simulation tasks. A program is developed and the simulation results were compared with that from TRNSYS. The results verify that the use of primitive parts and auto-connection technique can improve on the accuracy and flexibility on system simulation.The energy consumption of heater/chiller plant amounts to about 70% of the total energy in air-conditioning system. It is important for the selection of heater/chiller plant. The heater/chiller plant selection and decision-making based on web is discuss and a program based on AHP method is developed to facilitate the decision-making process. The results show that decision-making system based on web can contribute to information source sharing and reduce the cost of getting the information. Collaboration among the designers may be achieved and the quality of design may be improved and the design period may be shorten.Macro and auto-conversion techniques are also discussed and future development for next generation simulation software is briefly described. It is possible that tomorrow's energy simulation system will be the web-based collaboration system. |
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