CAJ | 학술논문

以R404A为工质,用热平衡法测试结霜工况下直接膨胀供液制冷系统以及重力供液制冷系统在不同蒸发器供液高度时的系统的运行特性,并进行比较.研究表明:在重力供液制冷系统中,蒸发温度和压力高于直接膨胀供液制冷系统,且受供液高度和环境温度影响;在不同供液高度时,重力供液制冷系统压缩机吸气压力高于直接膨胀供液制冷系统压缩机吸气压力,供液高度的增加,吸气压力升高,压缩机的排气压力的变化趋势与蒸发压力相似;重力供液制冷系统制冷量高于直接膨胀供液制冷系统制冷量,且随蒸发温度升高而增大,但制冷量的增加幅度却有着相反的变化趋势.供液高度为1200mm时,制冷量最大增幅达到35.59%;重力供液制冷系统COP大于直接膨胀供液制冷系统COP,重力供液制冷系统存在最佳供液高度.
이R404A위공질,용열평형법측시결상공황하직접팽창공액제랭계통이급중력공액제랭계통재불동증발기공액고도시적계통적운행특성,병진행비교.연구표명:재중력공액제랭계통중,증발온도화압력고우직접팽창공액제랭계통,차수공액고도화배경온도영향;재불동공액고도시,중력공액제랭계통압축궤흡기압력고우직접팽창공액제랭계통압축궤흡기압력,공액고도적증가,흡기압력승고,압축궤적배기압력적변화추세여증발압력상사;중력공액제랭계통제랭량고우직접팽창공액제랭계통제랭량,차수증발온도승고이증대,단제랭량적증가폭도각유착상반적변화추세.공액고도위1200mm시,제랭량최대증폭체도35.59%;중력공액제랭계통COP대우직접팽창공액제랭계통COP,중력공액제랭계통존재최가공액고도.
Using thermal balance method and R404A as refrigerant, the operating characteristics of refrigeration system with supply liquid refrigerant by gravity (RSSLRG) and direct expansion have been analyzed by experimental method in frost formation operating mode. The experiments indicate that the evaporating temperature and pressure of RSSLRG are higher than that of direct expansion system and affected by evaporating temperature and supplying height. In different supplying height of RSSLRG, the suction pressure and discharge pressure are higher than that of direct expansion system and changed with supplying height and environment temperature. The refrigerating capacity of RSSLRG is larger than that of direct expansion system and increasing with evaporating temperature, but the additional magnitude has opposite change trends. When supplying height is h1=1200mm, the max additional magnitude is 35.59%. In addition, the COP of RSSLRG is higher than that of direct expansion system, and it remarks that the RSSLRG exits an optimal supplying height.