温度传感器测量制冷系统蒸发与冷凝压力的新方法  

A New Method to Measure Condensation and Evaporation Pressures of Refrigeration Systems with Temperature Sensors

作　　者：邵双全[1] 石文星[1] 李先庭[1] 彦启森[1] 

机构地区：[1]清华大学建筑技术科学系,北京100084

出　　处：《仪器仪表学报》2002年第6期625-628,共4页Chinese Journal of Scientific Instrument

摘　　要：在制冷、空调系统自动控制中 ,通常以蒸发和冷凝压力作为被控对象 ,故压力传感器被广泛采用。为降低传感器成本 ,在小型房间空调器系统中采用冷凝器和蒸发器两相区的温度来反映系统的冷凝、蒸发压力 ;对于较大容量的多室内机直接膨胀式空调系统 (VRV空调系统 ) ,如今一般采用两个压力传感器来分别检测压缩机的吸、排气压力。这里利用制冷循环特性提出了一种用 2只温度传感器来代替两个压力传感器检测压缩机吸、排气压力的“压缩机吸、排气压力检测回路”,实验结果表明 ,该回路在压缩机吸气过热度为 2～ 15℃范围内 ,其动、静态特性均能较好地检测压缩机吸、排气压力条件下的饱和温度 。In refrigeration systems,the condensation and evaporation pressures represent the system states and external disturbances.When the refrigerant is in two phase state,to every saturation pressure corresponds saturation temperature.Therefore,a new method is presented to measure condenser and evaporator pressures based on the characteristics of the refrigeration system with two temperature sensors instead of two pressure sensors.The experimental results show this method has excellent static and dynamic performance especially in dynamic systems when the superheat temperature is between 2℃ and 15℃.This method can be used not only in room air conditioners but also in large and medium size refrigeration systems and can be easily installed.

关 键 词：温度传感器 制冷系统 制冷压缩机 蒸发压力 冷凝压力 测量 

分 类 号：TB663[一般工业技术—制冷工程] TP212.[自动化与计算机技术—检测技术与自动化装置]