微通道蒸发器在不同R404A充注量下的运行特性  

Performance charateritics of microchannel evaporator with different R404A charge quantities

作　　者：殷辉[1] 刘斌[1] 申志远[1] 董小勇[1] 

机构地区：[1]天津商业大学天津市制冷技术重点实验室,天津300134

出　　处：《低温工程》2013年第3期58-62,共5页Cryogenics

基　　金：十二五国家科技支撑计划重点项目(2011BAD24B01)资助

摘　　要：以微通道换热器作为蒸发器,研究800、1 000、1 100、1 200、1 300和1 400 g R404A充注量下冷库内温度的变化及蒸发器的蒸发温度和压降变化。研究表明:在上述工况下,制冷剂的充注量越大,冷库的温度越低,降温速率越大,1 300 g和1 400 g库温降到最低,保持在-22℃;800、1 000和1 400 g充注量下,所对应的蒸发器内制冷剂分别以气态、气液两相及液态为主,相对应的压降为0.07、0.08和0.04 MPa,工质充注量超过1 300 g时,回气管端的温度明显低于进液管端的温度,出现蒸发温度漂移现象。The temperature of cold storage was studied with different R404A charge quantity of 8 00,1 000,1 100,1 200,1 300 and 1 400 g,and the evaporation temperature and pressure-drop of evaporator were especially researched with charge quantity of 800,1 000 and 1 400 g when the microchannel heat exchanger was used as evaporator.The results show that the temperature of cold storage was declined and the temperature drop ratio of cold storage was becoming faster and faster with the increase of the refrigerant charge quantity from 800 to 1 400 g.When the charge quantity was over 1 300 g,the temperature of cold storage was kept at a constant temperature of -22 ℃.If the system was stable,the state of R404A in the microchannel was gas,liquid-gas and liquid respectively when the charge was 800 g,1 000 g and 1 400 g.Under this condition,the pressure-drop was 0.07,0.08 and 0.04 MPa.It must be paid attention that the outlet temperature of the microchannel was lower than the inlet temperature of the mirochannel,which means that there is a temperature drift in the microchannel evaporator.

关 键 词：充注量 微通道蒸发器 温度漂移 

分 类 号：TB657[一般工业技术—制冷工程]