| Title |
An Analysis of Heat Transfer and Pressure Drop Characteristics for Optimum Design of Cryogenic Heat Exchanger used for Liquid Nitrogen Cooling |
| Authors |
Ji Woon Ko ; Doong Soon Jeon |
| DOI |
http://dx.doi.org/10.6110/KJACR.2018.30.1.024 |
| Keywords |
극저온열교환기 ; 열전달 ; 액체질소 ; 압력강하 Cryogenic heat exchanger ; Heat transfer ; Liquid nitrogen ; Pressure drop |
| Abstract |
In this paper, analytical studies were conducted to obtain optimal design factors and analysis parameters of liquid nitrogen cooling exchanger applied in cryogenic refrigerator. The target value of heat transfer rate was more than 1 kW and pressure drop was less than 40 kPa. Design factors of cryogenic heat exchanger included width of channel and configuration of paths. Analytical factors of liquid nitrogen cooling exchanger included temperatures of coolant header surface and inlet liquid nitrogen. The width and number of channels in the design parameters were 0.0050~0.0150 m and 4~8, respectively. The configuration of channel path was 4 ways. Temperatures of coolant header surface and inlet liquid nitrogen in analytical parameters were 74 to 78K and 82 to 86K, respectively. As result, the design factor and analysis parameter satisfying the target values were obtained. The biggest heat transfer rate was 1.36 kW with pressure drop of 32.26 kPa. |