R600a를 이용한 소형 멀티형 냉장고 시스템의

안지훈(Jihoon Ahn),장용희(Yonghee Jang),김용찬(Yongchan Kim),장의영(Uiyoung Jang),박용종(Yongjong Park) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2

Various types of refrigerators become popular in the market such as a common refrigerator, kimchi refrigerator and wine cellar. It is required to develop a multi function refrigerator which has different purposes in each evaporator. In this study, the performance of a multi type refrigerator system, which consists of one machine room and three evaporators, was measured in a bench type multi refrigerator. The multi type refrigerator system was tested by varying the number of refrigerator cabinet, refrigerant charge amount, temperature condition. Based on experimental data, the multi type refrigerator showed better performance than the conventional refrigerator(single type) At the same external load condition, the COP of the multi type refrigerator was 1.22~1.29, but the COP of the single type refrigerator was 1.0.

R600a를 이용한 소형 멀티형 냉장고 시스템의 성능특성에 대한 실험적 연구

안지훈(Jihoon Ahn),장용희(Yonghee Jang),김용찬(Yongchan Kim),김용한(Yonghan Kim),장의영(Uiyoung Jang),박용종(Yongjong Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5

Various types of refrigerators become popular in the market such as a common refrigerator, kimchi refrigerator and wine cellar. It is required to develop a multi function refrigerator which has different purposes in each evaporator. In this study, the performance of a multi type refrigerator system, which consists of one machine room and three evaporators, was measured in a bench type multi refrigerator. The multi type refrigerator system was tested by varying the number of refrigerator cabinet, refrigerant charge amount, compressor frequency and temperature condition. Based on experimental data, the multi type refrigerator showed better performance than the conventional refrigerator (single type). At the same external load condition, the COP of the multi type refrigerator was 1.2~1.5, but the COP of the single type refrigerator was 0.8. The single and multi type refrigerator cycles were optimized at -30.0℃ and -25.0℃, respectively. Therefore, the multi type refrigerator may show low compression ratio than the single type refrigerator.

R600a를 이용한 소형 멀티형 냉장고 시스템의 성능특성에 대한 실험적 연구

안지훈(Jihoon Ahn),장용희(Yonghee Jang),김용찬(Yongchan Kim),최원섭(Wonseop Choi),오승환(Seungwhan Oh),김창년(Changnyeun Kim),이재승(Jaeseung Lee) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.4

Various types of refrigerators become popular in the market such as a common refrigerator, kimchi refrigerator and wine cellar. It is required to develop a multi type refrigerator combining these refrigerators to save space and energy consumption. In this study. the performance of a multi type refrigerator, which consists of one machine room and three evaporators, was measured in a bench type multi refrigerator. The multi type refrigerator was tested by varying the number of refrigerator cabinet, refrigerant charge, and temperature conditions. In addition, the multi type refrigerator with a suction line heat exchanger(SLHX) was tested to improve system performance. Based on the experimental data, the multi type refrigerator showed better performance than the conventional refrigerator (single type system). Besides. the COP of the single system increased from 1.0 to 1.37, and those of the dual and triple system increased from 1.29 to 1.39, and 1.22 to 1.51, respectively, by applying the SLHX.

냉장고 발화가능성에 대한 연구

정경만,정기신 한국화재감식학회 2014 한국화재감식학회 학회지 Vol.5 No.1

One of the necessary home appliances is a refrigerator. As it is used extensively, the number of refrigerator fire is increasing. This paper has investigated the causes of refrigerator fire and we want this paper is used the references in time of fire investigation. Refrigerator compresses the refrigerant by compressor and transfers liquified refrigerant to the freezer and vaporize it in this place. Refrigerator drops the temperature when the liquified refrigerants are vaporized. There are many kind of refrigerators according to usage, type, capacity. But, the basic structures are two, one is compressor circulating the refrigerant and the other is heating circuit eliminating the frost. There is a motor inside the compressor and the motor generates heat when the refrigerants are compressed. Also heating circuit generates the heat until going up to setting temperature. There are top 4 fire causes in refrigerator. The first is the inside coil short of compressor. The second is the fire of electrical wiring. The third is the insulation deterioration in condenser. The forth is the fire in start relay. Fire investigation should carry out scientifically considering these 4 causes.

냉장 중 품질변화 측정 지표 개발을 위한 냉장고 형태별(개방형 및 도어형) 저장 중 주요 냉장 식품의 품질변화 측정

장아라,송현지,정현우,추의진,이선영,A-Ra Jang,Hyunji Song,Hyunwoo Joung,Euijin Choo,Sun-Young Lee 한국급식외식위생학회 2023 급식외식위생학회지 Vol.4 No.1

This study was conducted to investigate the impact of refrigerator type and temperature fluctuations on the quality changes of refrigerated foods. Phycochemical and sensory quality, as well as microbial growth, were measured for various foods stored in open- or door-type refrigerators set at 5℃ during storage. The average temperatures recorded were 11.50±1.14℃ in an open refrigerator, and 6.34±0.97℃ in a closed refrigerator. The average surface temperatures of the food items were 9.60±1.20 and 6.00±0.80℃ for open and closed refrigerators, respectively. Significant changes in color and appearance quality were observed in lettuce, mackerel, ground beef, and cut pineapples when stored in open refrigerators. Ready-to-Eat foods such as gimbap and sandwiches exhibited higher levels of microbiological proliferation when stored in open refrigerators compared to closed refrigerators. Processed foods, such as sterilized milk and packaged tofu, did not show significant differences in quality among various types of refrigerators. The installation of refrigerator doors can effectively minimize temperature fluctuations caused by external factors, thereby reducing variations in food quality. These findings provide essential insights into the quality changes associated with the implementation of refrigerator doors, serving as fundamental data for ensuring optimal food preservation.

냉장고 식재료 관리 시스템 '포켓스캐너' 디자인 및 구현

정혜경,Chung, HaeKyung 한국반도체디스플레이기술학회 2021 반도체디스플레이기술학회지 Vol.20 No.1

In this study, we developed an application that can efficiently store and manage food ingredients in refrigerators. Rather than purchasing a new smart refrigerator, a small 'pocket scanner' is inserted inside the refrigerator using an existing refrigerator to track the location of food entering and leaving the refrigerator to efficiently organize the refrigerator and save time searching for ingredients. In addition, since it can automatically record the distribution period and purchase date, it notifies users through an alarm when the distribution period expires or is shortly left. As for the research method, after discovering the needs of users through in-depth interviews, the reactions of users were investigated by adding functions that fit those needs. Users felt satisfied with managing food efficiently through the 'pocket scanner' attached to the refrigerator and answered that it was very economical because various smart functions could be used without changing to a smart refrigerator. In the next study, we will also examine the usability of the application through usability evaluation.

김치냉장고 화재분석 및 발화원인에 관한 연구

이종인,최지훈,최돈묵 한국방재학회 2016 한국방재학회논문집 Vol.16 No.6

A kimchi refrigerator is becoming one of daily necessaries in modern times. Due to the significant increase of use, the risk of ignition and combustion is also significantly increased. As a kimchi refrigerator is one of electronic goods that is operated twenty-four hours per day, 365 days per year, there is a strong chance for potential fire. In addition, a kimchi refrigerator is located at the limited space along with continuous operation that will increased the chance of ignition at the refrigerator. The purpose of this study is to investigate the fundamental structural principle of kimchi refrigerator and its fire initiation mechanism. The study investigated previous fire cases associated with a kimchi refrigerator for setting the experimental study of kimchi refrigerator. The study finally conducted the experimental study to investigate the causes of fire ignition when the kimchi refrigerator was situated at the limited space and heavy operation situation. This study will be a fundamental source and material that can help a fire investigator to find out and prove the cause of a fire. 현대 생활에서 필수품으로 자리 잡은 김치냉장고의 사용은 꾸준히 증가하였으며, 그에 따라 해마다 화재건수 역시 증가하고 있는 추세이다. 김치냉장고는 전기, 전자부품을 이용하여 구동되는 기계 결합체로 한번 설치가 되면 1년 365일 통전되는 제품으로써 잠재적인 화재위험성이 높은 제품이다. 또한 설치 사용상 필요한 공간적 부분을 잊고 사용하였을 때 발열 개연성은 충분하다. 본 연구에서는 김치냉장고에 대한 구조원리 및 화재발생 메커니즘을 이해하려한다. 화재사례를 기초로 하여 실험을 진행하였고, 이를 바탕으로 정확한 화재원인 판정에 기초자료로 활용하고자 한다.

Review: Recent advances in household refrigerator cycle technologies

Choi, Seyoung,Han, Ukmin,Cho, Honghyun,Lee, Hoseong Pergamon 2018 Applied Thermal Engineering Vol. No.

<P><B>Abstract</B></P> <P>This paper comprehensively reviews household refrigerator technologies including current cycle options and future not-in-kind options. Most of the refrigerators are based on a vapor compression cycle (VCC), so that its options are reviewed and compared. The refrigerator cycles based on the VCC are categorized in three groups: dual evaporator cycles, expansion loss recovery cycles, and multi-stage cycles. For dual evaporator cycles, several methods of applying two evaporators are presented. For the expansion loss recovery cycle, ejector and expander cycles are explained. For multi-stage cycles, two-stage cycle and dual-loop cycle are mainly discussed. Moreover, refrigerants as a working fluid are reviewed. Lastly, not-in-kind technologies that are not based on the VCC, such as an absorption, thermoelectric, magnetic, thermoacoustic, and thermoelastic are presented for the application of domestic refrigerators. Even though they have not been widely used for household refrigerators due to insufficient reliability and lower performance, their potential is discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Recent studies on household refrigerator technologies are reviewed. </LI> <LI> Current household refrigerator cycle options are categorized and explained. </LI> <LI> Refrigerants for the refrigerator are comprehensively reviewed. </LI> <LI> Not-in-kind technologies for household refrigerators are introduced. </LI> </UL> </P>

폐일반냉장고에서의 HFC-134a 탈루배출 특성에 대한 연구

김승도,김의건,김혜림,이영표,변석호,박준호,이지애,서형주 한국폐기물자원순환학회 2013 한국폐기물자원순환학회지 Vol.30 No.2

Although scrap domestic refrigerator is regarded as a major source of HFC-134a, little information is available for its emission characteristics of HFC-134a. This paper addresses the fugitive emission factors of domestic refrigerator at usephase and disposal-phase. The residual quantities of Korean-made forty three scrap domestic refrigerators were weighed using a commercial recover of refrigerants to determine the emission factors at the disposal-phase. On the other hand, the emission factors at use-phase were estimated from the residual quantities and operating times. The average residual rate of forty three scarp domestic refrigerators is determined to be 75.1 ± 5.2%. The emission factor at the use-phase is estimated to be 2.4 ± 0.5%/yr as a result of using average age of 12.3 years and the average residual rate determined here. The emission factor at the disposal-phase is determined to be 31.9% after adopting 38% of the recycling rate of refrigerant reported by Recycling Center. We estimate 2.9 g/yr for the average emission quantity of HFC-134a per operating refrigerator, while 33.5 g for that per scrap domestic refrigerator. Since the chemical compositions of refrigerant of scrap domestic refrigerator were the same as those of new refrigerant, it is expected that the HFC-134a recovered from scrap domestic refrigerator can be reused for refrigerant.

10kW 냉동유닛의 냉동사이클 성능에 대한 실험연구

최연성,권영철 한국기계기술학회 2019 한국기계기술학회지 Vol.21 No.1

This experimental study was conducted to investigate the refrigeration cycle performance of a 10kW refrigerator unit using R404A refrigerant. The capacity, COP, and refrigeration cycle of the refrigerator unit were confirmed by changes in refrigerant charging amount and degree of superheat. The cooling capacity and COP of the refrigerator unit showed different tendency according to changes in refrigerant charging amount and degree of superheat. It was confirmed that the performance changes of the refrigerator unit were more dependent on the change in degree of superheat than the refrigerant charging amount. From the capacity, COP, pressure, and p-h diagram, the refrigeration cycle of the refrigerator unit showed the greatest capacity and COP at 4℃ for degree of superheat and 7,400g for the refrigerant charging amount.