• 한국산학기술학회논문지
• /
• 제15권6호
• /
• pp.3363-3369
• /
• 2014

최근에 건축물의 실내환경을 쾌적하고 안전하게 유지하는 데 많은 노력이 일어나고 있다. 이러한 가운데 주방에서 주로 사용되는 렌지후드에 따른 환기방식은 많이 채택되고 있다. 이에 따라 다양한 디자인의 렌지후드가 적용되고 있다. 렌지후드는 여러 가지 여건상 프레스 금형으로 제작되어 지는데 중,소량의 생산에는 경제성이 떨어진다. 이러한 문제점을 보완하는 방안이 검토되고 있는 상황에서 코어 변환에 따른 금형개발은 매우 유용하리라 판단된다. 본 연구는 금형의 core를 change core 공법으로 설계하였고, 총 4공정으로 금형제작을 수행하였다. 이런 결과로 생산기간 단축 및 모델변경이 용이한 프레스 금형을 개발하였다. 또한 시제품은 3차원 측정결과 제품 표면의 모든 영역에서 허용오차 범위(${\pm}2.00mm$)로 합격하였다.

• 한국전산유체공학회지
• /
• 제13권4호
• /
• pp.72-79
• /
• 2008

This study is to investigate the air flow around a sirocco fan which is used in a range hood. The main object of the study is to improve the flow rate of the fan by analysis of unsteady 3-dimensional incompressible flow. Overall analysis is carried out using CFD method. For this, we used a commercial code, SC/Tetra, and used a sliding mesh method to give the same condition as an actual state. First, verification of the CFD results is done by comparing the experimental data with the numerical data for the suction flow rate. It is confirmed that two results are well consistent. Then for the improvent of flow rate, the effect of shape factors such as diameter ratio of fan, geometry of case, cut-off aperture and guide angle of case exit on the suction flow rate was considered. Especially, for a new design of housing, the principle of Archimedes spiral was used. The overall analysis was applied to a new design of housing, and the result showed an increase of flow rate by 10.7%.

• 한국전산유체공학회:학술대회논문집
• /
• 한국전산유체공학회 2008년도 학술대회
• /
• pp.159-165
• /
• 2008

A sirocco fan is widely used for discharging pollutants of a kitchen space since it is able to generate a relatively high air flow rate considering its small size and makes less noise than a axial fan or a centrifugal fan. However, it has a problem because its efficiency is low, and power consumption is larger. Performance of a sirocco fan is influenced by various factors such as number of the fan blades, diameter of the fan, geometry of the fan, geometry of its housing, revolution frequency, static pressure condition, and etc. This research investigated the effect on the performance of geometry of the housing. For CFD analysis, we used a commercial code, SC/Tetra, and used a sliding mesh method to give the same condition as an actual state. Verification of the CFD results is done by comparison of experimental data and numerical one about the suction flow rate, and it is confirmed that two results are well consistent. After we changed the shape of housing according to Archimedes' screw, we observed that suction efficiency is improved by 10.7% maximum.

• 유체기계공업학회:학술대회논문집
• /
• 유체기계공업학회 2002년도 유체기계 연구개발 발표회 논문집
• /
• pp.123-128
• /
• 2002

Over the range(OTR) has been applied for cooking and ventilation functions especially in northern Amarica. Because flow rate and operating rpm of the double sided sirocco fan for ventilation are much higher and than the microwave oven system, the major noise source is the sirocco fm. Recently, the quiet fan development is one of very important issues for amenity. In this study, the noise source identification using multi-microphone array system was carefully carried out and numerical simulations for understanding the aerodynamic and aeroacoustic of the fan were peformed. The sound level of tonal noise is predicted with a good accuracy but that of the broadband shows some discrepancy. In order to reduce the broadband noise, the inlet region of sirocco fan have to be modified that the secondary flow should be suppressed. Based on these results, new low noise fan and OTR is now developing.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2004년도 춘계학술대회논문집
• /
• pp.848-851
• /
• 2004

This paper studied a method for minimizing the noise level emitted from range hoods. Range hoods were used for discharging various hazardous materials generated during household cooking to the outdoors, thus preventing them from being diffused through rooms in the house since they are the main cause of air pollution within dwellings. This study assumed that static pressure was not applied at the discharge outlet of the range hood. As such, the range hood was installed on the wall without the use of a connecting duct or other connectors attached to its discharge outlet. The vibration having the greatest influence on the noise level was determined by measuring the vibration at the front side of the hood where the acoustic omission was at its maximum. A method was then proposed to reduce the noise by simply suppressing the vibration at the vibrating part.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2005년도 춘계학술대회논문집
• /
• pp.209-212
• /
• 2005

Recently, since structures have become extremely airtight with the development of high-rise apartments, mixed use residential and commercial buildings and offices, large capacity range hoods have become commonly implemented. However, the high noise level caused by this range hood system made of thin plate is the cause of increased complaints among users. In this study, the level of noise emitted from this type of range hood was measured by height at the user's location in the kitchen. It was confirmed that a great deal of noise was emitted in the downward direction of the hood. In order to minimize the noise emitted from this type of range hood, a new type of fan was manufactured. This was done by changing only the material and shape of the fan, since it was determined to be the primary source of noise emission. Then a comparison and evaluation were carried out regarding the noise characteristics between the new type of fan and the existing type of fan. As a result, it was confirmed that the noise from the new fan was reduced by more than 2 dB compared to the existing fan without noise interference at the discharge end.

• 한국조리학회지
• /
• 제22권8호
• /
• pp.149-156
• /
• 2016

본 연구의 목적은 조리과정에서 발생한 총휘발성 유기화합물질, 미세먼지, 악취, 총부유세균 등의 오염물질들이 조리실내로 분산되어 실내공간이나 조리업 종사자에게는 나쁜 냄새나 작업환경 및 건강피해를 감소하고자 하는 것이다. 이를 위해 기존 공기청정기의 단점을 보완하고, 반영구적이며, 각종 오염물질을 효율적으로 제거하기 위하여 활성탄과 황토를 결합한 바이오세라믹 필터를 bar type으로 제작한 실내용 소형 공기청정기 개발에 중점을 두었다. 측정항목은 총휘발성 유기화합물, 미세먼지, 복합악취, 총부유세균 등 모두 4가지 항목으로 개발된 공기청정기 가동 전과 일정시간 가동 후를 비교하여 측정하였다. 측정결과, 총휘발성 유기화합물의 농도는 평균 $2,500{\mu}g/m^3$에서 $223{\mu}g/m^3$으로 약 91.02%의 높은 제거효율을 보였으며, 미세먼지의 제거율은 평균 농도가 $26.68{\mu}g/m^3$로서 97.51%의 우수한 제거효과가 나타났으며, 복합악취의 희석배수를 측정한 결과 평균 144로 평균 95.20% 감소하였다. 또 총부유세균은 초기 농도가 $787{\sim}814CFU/m^3$에서 $47{\sim}40CFU/m^3$로 약 94% 이상 제거되는 것을 확인하였다. 결론적으로 개발되어진 공기청정기의 바이오세라믹 필터는 오염물질을 제거하는데 우수한 제거효과를 나타냈다. 따라서 공기청정기를 조리실내에서 환기장치와 렌지후드를 병행하여 사용하면 기존의 열악한 조리실 내의 환경이 크게 개선되어질 것으로 사료된다.