| Title |
A Study on the Performance Characteristics of a Falling Film Type Absorber for Use in an Absorption Chiller |
| Authors |
Seong Pil Son ; Seong Min Kim ; Ji Sung Kim ; Eun Seok Wang ; Sang Jun Park ; Sung Min Woo ; In Gwan Kim ; Min Soo Kim ; Chan Woo Park |
| DOI |
http://dx.doi.org/10.6110/KJACR.2018.30.6.266 |
| Keywords |
흡수식 냉온수기 ; 유하액막 흡수기 ; 전열관 ; 열전달 Absorption chiller ; Falling film absorber ; Heating tube ; Heat transfer |
| Abstract |
In this study, the basic performance characteristics of a falling film type absorber for use in an absorption chiller were investigated. In order to improve the performance of the absorber, newly-designed heating pipes were tested. End Cross 38, End Cross 40, End Cross 26-2V, End Dimple, and NF tubes were tested, as well as conventional tubes (Floral tube and End Cross 26 tube). If the falling film absorber is theoretically divided into an upper part that covers the top 35%, a middle part that covers the middle 35% below the upper part, and a lower part that covers the bottom 30%, a high heat transfer and vapor absorption process occurs in the upper region, with successively lower heat transfer and vapor absorption processes in the middle and lower parts. In the case of a low liquid film flow rate of less than 20 liquid film Re, the EC 26 tube has a high overall heat transfer coefficient, and at high liquid film flow rates of 20 to 30 liquid film Re, which are the operating conditions of actual absorption refrigerator commercial equipment, the EC 40 tube has the highest overall heat transfer coefficient. It was also found that the EC 2 V heat transfer tube has a high overall heat transfer coefficient. Finally, it was found that the Floral tube had a generally low heat transfer coefficient. |