B/F형 냉장고 냉동실의 내부 유동해석 및 결빙최소화

Abstract

Recently, the customers satisfaction measurement is higher than the past because of improving the performance of home appliances and rising product prices. So, many companies are doing research for satisfy a customer satisfaction measurement. Among all of the freezing machines, refrigerator is the most famous. Refrigerator is supplied to each families and the number of refrigerator is higher than the past. From past to now, refrigerator have a some problem to frost formation. The frost formation in the refrigerator leave a bed impression behind to the customer and that is lower in quality. On this account, recently many researchers are study about the best way to solve frost formation. But, the problem of frost formation is very complex and that's solving method is very hard. In this study, the purposes are to find out main cause of frost formation and minimize the frost formation in the freezer. This study is about B/F refrigerator. B/F refrigerator mean to freezer is located to the under of refrigerator. In this paper, we have studied numerical stimulation and experiments. In experiments, we observed that the changes on temperature at the wall and amount of frost formation in the freezer. The experiment on frost formation according to the KS(Korea Standard) C 9305 and KS B 8561 level. We used to T-type thermocouple. In stimulation, we observed that the flow pattern and velocity field in the freezer. The stimulation use to FLUENT that was solved by K-? turbulence model. In this stimulation, we assumed that the air is incompressible and steady state. The result shown that the temperature variation is low at the each wall in freezer. But, changes on temperature is high at the each measure point. We can see that temperature is the lowest and changes on temperature is the highest at the inside wall(Grill) in the freezer. The temperature is lowest at the inside wall because of evaporator was located to back of inside wall and inlet of cool air was located to the inside wall. Also, in stimulation, we can see that the cool air tends to flow to the bottom. We represent to temperature fields by experimental temperature data at the freezer. In this temperature fields, we observed high temperature of over 0℃ to the inlet of cool air at the compressure was off and the process of defrosting. This changes on temperature make a frost formation because of over 0℃ temperature. In the velocity fields, we observed that two recirculating zone was made of air flow in the basket. And, recirculating zone was made of air flow at the space between wall of freezer and basket. Recirculating zone and the region of frost formation was identical. Also, we observed that the recirculating zone's temperature was low. As a results, the frost formation was created the region of temperature was increase over 0℃ and high changes on temperature. Also that was find out the recirculating zone. So, we need to methods about decrease the frost formation in freezer. First, decrease the changes on temperature in freezer. Second, optimize design for the flow in freezer. That is key points on this study.