An Experimental Study on the Performance of Diffusion Bonding Heat Exchangers

The objectives of this paper are to study the characteristics of heat transfer and pressure drop of the micro channel heat exchangers using diffusion bonding technology. Four types of heat exchangers are designed and manufactured, which are straight type, long dot type, splited wavy type and straight double side type. Heat transfer and pressure drop performance of each heat exchangers are measured in various operating conditions, and compared each other. The results show that the (j/f) 1/3 performance of splited wavy type and long dot type increases about 10.3% and 6.1% at the Reynolds number 470 compared to that of straight type, respectively. On the other hand, (j/f) 1/3 performance of straight double side type decreases 19.7%.기호설명A s : 열전달면적 [mm 2 ] C: 열용량 [W/℃]C p : 비열 [J/kg․℃]D h : 수력직경 [mm] ff: 인자 j j: 인자 : 질량유량 [kg/h]Nu : 누셀트수△ P: 압력강하 [kPa] Q: 열전달률 [kW]Re : 레이놀즈수 T: 온도 [℃]Δ T: 온도차 [℃] U: 총괄열전달계수 [kW/m 2 ․℃]e : 유용도 †책임저자, 회원, 한국생산기술연구원 에너지설비기술지원센터 E-mail : kwonok@kitech.re.kr TEL : (041)589-8528 FAX : (041)589-8330 * 회원, 한국생산기술연구원 에너지설비기술지원센터