Study On Air Heat Exchanger In Communication Base Station

Communication base station is an important part of the communication system. Its internal temperature, humidity, degree of cleanliness and other environmental parameters not only have a direct impact on the communication equipment's reliability and service life, but also relate to the smooth operation and security of the communication process.Communication base station's heat dissipating capacity is big and concentrated. Its internal equipment operates uninterrupted all the year with a high loading, even in the winter, there may be heat dissipating, so the air-conditioning which bears the heat dissipating capacity needs to working continuously with a high loading, thus entaking a high electricity cost on the communication base station.So under the current tense energy circumstance, effectively energy-using and energy-saving are necessary in the design of the communication base station. Under this background, there is the energy saving alternatives of base station's air conditioning systems—air heat exchanger. The principle of energy saving of this equipment as follows: in intermediate season and winter, when the outdoor temperature is low, using the indoor and outdoor air temperature heat transferring to eliminate communication equipment plant's excess heat so as to substitute the air-conditioning, then realizing communication base station's energy saving.The dissertation can be divided into three parts:(1) The experimental study on the isolated plate air heat exchanger used in communication base station. The aim of experiment is to find the relationship between the heat transfer performance and air velocity, and to find the relationship between the pressure drop and air velocity. The cooling effects of the heat exchanger will also be studied. The results show that the heat transfer coefficient and pressure drop increase as the air velocity increases, and the change is in tends in steep. And the heat transfer efficiency decreases as the air velocity increases, but the trend is gentle.(2) The study on gravity heat pipe heat exchanger.According to the features of the communication base station, a gravity heat pipe exchanger has been designed using conventional calculation, and based on VB, the design and calculation is made. In addition, the calculation process is introduced by a project example, and its computation results are studied.(3) The applicability analysis on the two types of heat exchanger used in communication base station all over china.Whether the heat exchanger use or not is determined by the difference between indoor and outdoor air. And the performance of two types of heat exchanger is different. How about the economy of two types of heat exchanger in the national? And that result will directly affect the application in the national. The yearly load of a typical base station is calculated by DEST, and the calculation involves five climatic regions in the national. Then analysis the energy-saving of the two types of heat exchanger in different area. The result shows that, energy saving effect by using the technology was significant; in city of Kunming(warm region) the annual power saving rate is the highest, about 39% (plate heat exchanger); in city of Guangzhou(region of hot summer and warm winter) the annual power saving rate is the lowest about 14% (plate heat exchanger); the energy saving effect of plate heat exchanger is close to the effect of gravity heat pipe heat exchanger.