Variable-voltage variable-frequency drives have been widely adopted by building services engineers in the area of HVAC （heating, ventilation and air conditioning） applications and became the substantial energy consu...Variable-voltage variable-frequency drives have been widely adopted by building services engineers in the area of HVAC （heating, ventilation and air conditioning） applications and became the substantial energy consumption in both commercial and residential buildings. Since the speed of a compressor driven by a conventional TPIM （two-phase induction motor） is fixed, it is either switched ＂ON＂, working at maximum capacity or switched ＂OFF＂ by a thermostat. While the most recent VF （variable-frequency） reluctance motor driven compressor delivers an enhanced performance over TPIM drive, it also provides variable-speed operation as the temperature changes, while improving the overall energy efficiency. This paper aimed to evaluate the performance of both TPIM and VF compressor drives for single-phase residential air-conditioning applications. Their cooling performance and harmonic distortions will be investigated. International standards for harmonic limits will also be applied in evaluating the distortions created by the VF drive.展开更多
文摘最大化你的压缩驱动器 你知道DoubleSpace怎样为一个硬盘估计一个压缩率吗?不同的机器允许这种比率大小不同,并且磁盘上文件的可压缩性不会是一个决定性的因素。 我有一个425MB硬盘,其中422MB的空间用于压缩的卷文件。有170MB在压缩的驱动器上,DOS6.20的DoubleSpace报告说压缩率为2.0∶1,并且估计该压缩率是1.3∶1。DOS报告说共有512MB的磁盘空间。当我试着改变估计的压缩率时,提示为“Enter a num-
文摘Variable-voltage variable-frequency drives have been widely adopted by building services engineers in the area of HVAC （heating, ventilation and air conditioning） applications and became the substantial energy consumption in both commercial and residential buildings. Since the speed of a compressor driven by a conventional TPIM （two-phase induction motor） is fixed, it is either switched ＂ON＂, working at maximum capacity or switched ＂OFF＂ by a thermostat. While the most recent VF （variable-frequency） reluctance motor driven compressor delivers an enhanced performance over TPIM drive, it also provides variable-speed operation as the temperature changes, while improving the overall energy efficiency. This paper aimed to evaluate the performance of both TPIM and VF compressor drives for single-phase residential air-conditioning applications. Their cooling performance and harmonic distortions will be investigated. International standards for harmonic limits will also be applied in evaluating the distortions created by the VF drive.
