공기 순환제상법의 성능향상을 위한 제상 로직 개선

Abstract

본 연구에서는 증발기 제상에 사용되는 공기 순환제상법의 제상 로직 상 문제점을 파악하고, 제상의 성능을 향상하기 위해 제상 로직을 개선하였다. 연구에서 찾은 문제점은, 첫번째 제상사이클이 융해수가 배출되는 도중에 종료되며 압축기가 작동되기 때문에 배출되지 못한 융해수가 두번째 제상사이클의 제상부하로 작용한다는 것이다. 또한 첫번째 제상사이클의 신뢰성이 확보되었음에도 추가적인 제상사이클(두번째 제상사이클) 설정으로 일반사이클로 냉장 운전이 복귀하는 시간을 지연하는 문제점이 있었다. 이런 문제점을 해결하기 위하여 첫번째 제상사이클 종료온도를 높게 설정(4℃)하여 제상시간을 연장하고, 두번째 제상사이클을 삭제하여 1회의 제상사이클만 갖도록 제상 로직을 개선하였다. 개선된 제상 로직을 적용한 결과 첫번째 제상사이클에서 융해수를 완전히 배출시킬 수 있었으며, 총 제상시간을 기존제상에 비해 106분 단축시켜 기존제상에 비해 성능이 향상됨을 확인할 수 있었다.|In this study, the problems of the defrost logic the air circulating defrost method used in defrosting were identified and the defrost logic was improved to improve the defrost performance. The problems found in the study were that the first defrost cycle is terminated during the discharge of the melted water, and the melted water that was not discharged acts as the defrost load of the second defrost cycle. So, it lengthened the total defrost time. In addition, although the reliability of the first defrost cycle was secured, there was a problem

of delaying the time for returning the refrigeration normal operation cycle by setting an additional defrost cycle (second defrost cycle). In order to solve these problems, the defrost time was extended by setting the first defrost cycle end temperature Tdef,1 higher than now, and the defrost logic is improved to have only one defrost cycle by deleting the second defrost cycle. As a result of applying the defrosting logic, it was possible to discharge the

molten water completely in the first defrosting cycle, and to shorten the total defrosting time by 106 minutes.; In this study, the problems of the defrost logic the air circulating defrost method used in defrosting were identified and the defrost logic was improved to improve the defrost performance. The problems found in the study were that the first defrost cycle is terminated during the discharge of the melted water, and the melted water that was not discharged acts as the defrost load of the second defrost cycle. So, it lengthened the total defrost time. In addition, although the reliability of the first defrost cycle was secured, there was a problem

of delaying the time for returning the refrigeration normal operation cycle by setting an additional defrost cycle (second defrost cycle). In order to solve these problems, the defrost time was extended by setting the first defrost cycle end temperature Tdef,1 higher than now, and the defrost logic is improved to have only one defrost cycle by deleting the second defrost cycle. As a result of applying the defrosting logic, it was possible to discharge the

molten water completely in the first defrosting cycle, and to shorten the total defrosting time by 106 minutes.