变频器在中央空调系统的应用.doc

××××学院毕业设计（论文） 变频器在中央空调系统节能改造中的应用研究 学 生：××× 学 号： 专 业：电气工程及其自动化 班 级： 指导教师： ××××学院自动化与电子信息学院 二00九年六月摘 要 中央空调系统已广泛应用于工业与民用领域，在宾馆、酒店、写字楼、商场、住院部大楼、工业厂房中的中央空调系统，在没有使用具备负载随动调节特性的控制系统中，无论季节、昼夜和用户负荷怎样变化，各电机都长期固定在工频状态下全速运行，能量的浪费是显而易见的。近年来由于电价的不断上涨，造成中央空调系统运行费用急剧上升。据统计，中央空调的用电量占各类总用电量的70%以上，其中中央空调水泵的耗电量约占总空调系统耗电量的2040%，故节约低负荷时压缩机系统和水系统的消耗的能量，具有很重要的意义。近年来随着IC产业的迅猛发展，变频器的价格大幅下降，采用变频器对风机、水泵类机械进行调速来调节风量、流量，已变得越来越现实，其对节约能源、提高经济效益具有重要意义。 ABSTRACT The central air-conditioning system has widely applied in the industry and the civil domain, in the guesthouse, the hotel, the office, the market, in-patient department building, the industry workshop central air-conditioning system, in does not have the use to have in the load follow-up adjustment characteristic control system, regardless of the season, how the day and night and the user do shoulder change, various electrical machinery all for a long time fix under the power frequency condition the full speed movement, the energy waste are obvious. In recent years as a result of the electrovalence unceasing rise, created the central air-conditioning system operating cost to rise suddenly. Statistics have indicated, the central air conditioning electricity consumption occupies each kind of building building total electricity consumption above 70%, in which central air conditioning water pump power consumption approximately composes the total air-conditioning system power consumption 20%~40%, when saves the low load the compressor system and the aqueous system consumption energy, has the very vital significance. In recent years along with the IC industry swift and violent development, the frequency changer price large drop, used the frequency changer to the air blower, the water pump class machinery carries on the velocity modulation to adjust the amount of wind, the current capacity, has become more and more realistic, it to saved the energy, enhances the economic efficiency to have the vital significance.