| Title |
Optimization of Spray Nozzle, R-404A Charge Amount and Visualization of Ice Formation in a Residential Built-in Ice Maker |
| Authors |
Nae-Hyun Kim ; Hyun-Jin Kim |
| DOI |
https://doi.org/10.6110/KJACR.2017.29.8.437 |
| Keywords |
제빙기 ; 가정용 ; 빌트인 ; 최적화 ; R-404A Ice maker ; Residential ; Built-in ; Optimization ; R-404A |
| Abstract |
Because of improvement of living standards and increased use of ice at home, built-in ice makers are of interest. In this study, refrigeration cycle of a unitary ice maker for residential usage was optimized using R-404A. Optimization was achieved through a search for proper refrigerant charge amount. For the present ice maker producing ice for 24 cups, the optimum charge amount was 200 g. In this configuration, the ice making cycle time was 17 minutes 53 seconds, ice production was 1.27 kg/h and COP was 0.310. After initial start-up, condensation and evaporation temperatures gradually decreased with time. As ice builds in the cup, heat transfer performance of the evaporator decreases, that results in decrease of evaporation and condensation temperatures. Replacement of existing slit nozzles with individual circular hole nozzles improved ice production capacity by 10 percent. Through visualization of ice formation in the ice cup, growth rate of the ice in the cup was relatively uniform. |