Study On Building Distributed Energy Systems

With the development of social economy,the energy structure is constantly being adjusted,demand for energy is increasing and environmental problems are increasingly.To solve the problem of environment and energy,China government encourages energy conservation and emissions reduction.On the basis of saving energy,distributed energy system can satisfy the user's different demand for cold hot and electricity load.The system can not only realize the ‘cascade utilization of energy',but also improve the energy efficiency.First of all,the paper takes four kinds of typical building style buildings in colder regions for instance.Buildings' load characteristics and effect of thermoelectric ratio on energy saving rate are analyzed.The applicability of distributed energy system to typical buildings is studied.Influence of natural gas price and electricity price on the feasibility of the system is discussed.Results show that office buildings and hotel buildings in cold regions are more suitable to adopt distributed energy system in winter and summer,but are not suitable to use this system in the transition season.Hospital buildings are suitable to use the distributed energy systems throughout the year,and shopping malls are not suitable to use the system.Secondly,the commonly used equipment configuration of distributed energy system is studied.The minimum life cycle cost is taken as the goal to establish the system operation optimization model.According to the load characteristics of the building,the best equipment configuration is determined.It was found that the more economical and energy-saving scheme is the one with gas turbine,flue gas absorption heat pump,electric refrigerator and gas boiler.Lastly,the simulation models of gas turbine and flue gas absorption chiller are created.Main factors affecting the operation of the equipment(such as ambient temperature,natural gas,flue gas temperature and flow rate,inlet temperature and flow rate of hot and cold water,etc.)are discussed.At the same time,the intelligent theory is applied to the distributed energy system to realize the intelligent operation and control of the system.