| Energy plays a vital role in economic development and social progress around the world. To achieve sustainable development of human society, on the one hand natural energy must be made full use, and actively develop new energy; on the other hand the best way to save energy must be seek through technological innovation, improving efficiency of energy. Building energy occupy a certain share of the total energy consumption, because of their special characteristics of the communication station represented by the high heat buildings, the heat dissipation of the building internal the equipment is so much that required cooling year round in order to control the indoor temperature environments. The consumption of air-conditioning system accounted for more than 45% of the total power consumption of the base station as a communication station indoor work environment to maintain important equipment. Therefore, energy-saving air-conditioning system for communication base building energy efficiency is of great significance.There are two main ways to use natural outdoor cold source (cold air in this paper) in traditional communication base stations:the direct introduction of new wind and the isolated heat exchange method. Phase change energy storage technology can solve the mismatch in time and space for energy supply and demand, and optimize energy allocation and improve energy actual utilization. The peak and valley energy-saving technology has been relatively mature in our country. This paper will couple the peak and valley electric charges, outdoor natural cooling source and phase change energy storage to develop a new type of ternary two-way phase change heat transfer model. According to the special climatic zoning and environmental requirements of communication base station, this paper selects the mixture of organic phase change materials capric and lauric acid, when capric acid content is about 70%, the phase transition temperature of mixture of is 19.8 ℃, which belongs room temperature phase change material, and latent heat is 126.6J/g. To study heat conduction technology of this new phase-change thermal storage heat exchanger module. First, to analyze two way heat transfer including PCM by means of numerical simulation, one-way heat transfer of the phase change material and a separate refrigerant (chilled water) and two-way heat transfer of phase change material and the carrier refrigerant (cold air). Determine the best structure form and size. Then couple two heat exchanger structure, proposing a new and efficient ternary two-way phase change heat transfer module. To analyze of the heat transfer process and the heat storage and release time by the mean of numerical simulation. And compared with the low price storage alone and separate outdoor cold source storage methods, verify its advantages. Couple the ternary phase change heat transfer module with a new air unit, introduces the calculation method of heat transfer unit number, presents a way to comprehensive consideration of the phase change material utilization satisfaction rates of air condition and operating costs of air handling savings rate to determine the best method of phase change storage units storage capacity and run the program, and put forward the concept of critical additional initial investment. Verify the feasibility of a new type of heat exchanger from the operation cost and heat transfer performance.In some areas the outdoor winter cold source can be taken advantage for communication base instead of air conditioning refrigeration. Supply cold of the room during the day, outdoor cold air and low price can simultaneously be used to cool the PCM at night and released the cold in the day in some areas of large temperature during the transitional season, it saves energy, but also reduce the cooling capacity of the units, to improve efficiency of refrigeration units. There is great application prospect in terms of energy saving. |
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