Experimental analysis of the scroll compressor performances varying its speed
Experimental analysis of the scroll compressor performances varying its speed
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DOI：
10.1016/j.applthermaleng.2005.10.023
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发表时间：
2006-07
影响因子：
6.4
通讯作者：
C. Aprea;R. Mastrullo;C. Renno
中科院分区：
文献类型：
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作者：
C. Aprea;R. Mastrullo;C. Renno
针对能够同时作为冷水机组和热泵运行的蒸汽压缩设备，本文的目的是通过实验评估改变涡旋压缩机速度来控制制冷量而不是传统的恒温控制所获得的节能效果。压缩机速度通过模糊算法连续控制，该算法调节位于为压缩机电机供电的电线上的逆变器。相反，恒温器的控制对以 50Hz 标称频率工作的压缩机施加开/关循环。特别是，研究了通常用于需要供应冷冻水和再热水的工业加工或调节工厂的蒸汽压缩实验设备的性能。该实验装置由一台封闭式涡旋压缩机、一个插入水箱的板式水热交换器、一个翅片管空气热交换器、两个恒温膨胀阀组成，这些恒温膨胀阀取代了不适合快速负载变化的传统毛细管。与半封闭往复式压缩机相比，涡旋压缩机的使用允许压缩机电动机提供甚至 15Hz 的电流频率，半封闭往复式压缩机对于 30Hz 以下的频率值会出现相当大的振动和噪音增加，并且由于飞溅系统而导致润滑问题。对于不同的工况，采用基于模糊逻辑的涡旋压缩机速度控制算法，与传统的恒温控制相比，平均节能显着约20%。此外，本文的目的还在于通过实验确定与确定的加热（冷却）负载相对应的最佳频率，该频率通过逆变器施加到压缩机电动机上，以获得最高的节能效果。
Referring to a vapour compression plant able to operate both as water chiller and heat pump, the aim of this paper is to evaluate experimentally the energy saving obtainable varying the scroll compressor speed to control the refrigeration capacity instead of the classical thermostatic control. The compressor speed is continuously controlled by means of a fuzzy algorithm regulating an inverter located on the electric line supplying the compressor motor. On the contrary the control by thermostat imposes on/off cycles on the compressor that works at the nominal frequency of 50Hz. In particular, the performances of a vapour compression experimental plant, generally used in industrial processing or conditioning plants where a supply of refrigerated and reheated water is required, are studied. The experimental plant is made up of an hermetic scroll compressor, a plate-type water heat exchanger inserted in a water tank, a finned tube air heat exchanger, two thermostatic expansion valves that have substituted the classical capillaries not suitable for fast load variations. The use of a scroll compressor allows to have a compressor electric motor supply current frequency even of 15Hz in comparison with the semi-hermetic reciprocating compressor that for frequency values under 30Hz presents considerable vibrations and noise increase together with the lubrication troubles due to the splash system. For different working conditions a significant energy saving on average equal to about 20% has been obtained adopting a scroll compressor speed control algorithm, based on the fuzzy logic, in comparison with the classical thermostatic control. Moreover, in this paper the aim has been to determine also experimentally the optimum frequency, corresponding to a definite heating (cooling) load, to be imposed to a compressor electric motor by means of an inverter to obtain the highest energy saving.