R407C를 사용한 확관후의 평활관에서의 응축 및 증발 열전달 실험

Condensing and evaporating heat transfer and pressure drop flow characteristics were measured using a ternary R407C which is a candidate of alternatives of HCFC22. Condenser and evaporator are subdivided into 3 parts, respectively : pre part, test part, after part. Pre part controls test part inlet quality and after part controls system pressure. Test parts has straight, horizontal tube with a length of 0.49m. The range of test part's conditions were : system pressure of 1.8 to 2.1 MPa in condenser and 0.47 to 0.67MPa in evaporator. Mass velocity of 170 to 270 ㎏/㎡s in condenser and 170 to 280 ㎏/㎡s in evaporator. The measured condensing and evaporating heat transfer and pressure drop of R407C are less than those of HCFC22 under similar conditions.