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China's building energy use has exceeded the country's total energy consumption of 1/4, and with the improvement of people's living standards gradually increased to 1/3. A huge number of public buildings energy use, waste. Public building contains office buildings (including office buildings, office buildings and other government departments), commercial buildings (such as shopping malls, financial buildings, etc.), tourism construction (such as hotel restaurants, entertainment, etc.), science, education buildings (including cultural, educational, scientific research, medical, health, sports buildings, etc.), communications architecture (such as telecommunication, broadcasting space) and transportation space (such as airports, railway stations and construction). Currently in China each year about 20 billion completed GFA m2, of which there are about 400 million of public buildings m2. In public buildings (especially large-scale shopping malls, luxury hotels hotel, upscale office buildings, etc.) the annual energy consumption, about 50% to 60% of consumption in air conditioning and refrigeration and heating systems, 20% to 30% for lighting. Including heating and air conditioning energy consumption is particularly high, the greatest potential for energy saving heating and air conditioning. In this paper, the energy efficiency of existing evaluation index, based on the proposed energy efficiency air conditioning system (OEER) concept, which is defined as the actual cooling load divided by the air conditioning system air-conditioning system of each device and the actual power consumption. Made for the purpose of OEER evaluate the actual operation of the air conditioning system energy efficiency, which can represent a time efficient case could also represent a period of time the efficiency of the case, and even the efficiency can reflect a season conditions. OEER larger, air-conditioning system, the higher the efficiency of energy use. In this paper, two engineering examples, analyzes the status of energy efficiency air conditioning system and its influencing factors, draw power consumption of host and host COP air conditioning systems account the proportion of the total power consumption of air-conditioning system is to determine the energy efficiency of x fundamental factor. Host load rate, the host water temperature, water system operation plan, the cooling tower operation programs and other factors are affecting the host through the COP and the ratio x of these two basic factors which have an impact on OEER. In this paper, mechanism analysis, to establish energy efficiency air conditioning system optimization model. According optimization model, calculated using MATLAB mathematical software under partial load optimization parameters, analyze the existing system does not make a big change, based on the system by changing some of the running and management measures, as well as re-set operating parameters, energy efficiency of air conditioning systems can impact. And with OEER as the objective function, using the direct derivation method OEER the sensitivity analysis, the objective function of several independent variables with the trends and the degree of change. Reconfigure the operating parameters on the basis of, this paper analyzes the application of some of the existing, viable energy-saving technological transformation of energy efficiency measures on the impact of air conditioning systems, and make an economic analysis for the renovation of public buildings provide air conditioning systems reference.
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