Currently, the cutting oil supply device is not equipped to cool the cutting oil. Therefore, additional cooling device should be connected to cool the cutting oil. This has the disadvantage of increasing the size of the device and reducing its cooling capability. To overcome these shortcomings, cooling coils are applied to the outside of the cutting oil filtering device to develop a heat exchanger filter for simultaneous coolant filtering and cooling to improve the compactness of the cutting oil supply device and cooling capability of the cutting oil. For the development of heat exchanger filter, flow and heat transfer analysis were performed. Due to the small heat transfer area of 10 cooling coils, less heat exchange occurred. In the 20 cooling coils, the coolant cooling coils prevented smooth flow of the cooling oil in the heat exchanger filter. The cooling efficiency of the 15 cooling coils were best, and the cooling temperature decreased non-linearly as the supply flow rate of the cutting oil increased.

Warpage of injection molded product is caused by non-uniform shrinkage and residual stress. A method of removing uneven molding shrinkage and residual stress is to remove the defective factor to Uniform cooling of products. Warpages for part designs have been investigated in this study according to the injection molding conditions for amorphous ABS and crystalline PP by the rapid cooling and heating system. Experimental results showed that the crystalline resin was more warped than amorphous resin, Warpages have been observed in the regions of the part, near gate region and flow direction region.

This study was developed the rapid heating and cooling device using peltier module for uniform cooling. make the rapid heating and cooling device(RCHD), for traditional water cooling device(TWCD) method and the rapid heating and cooling method warpage were compared and were analyzed and the materials used crystalline PP polymer. various warpage were compared for the process parameters such as packing pressure, packing time, mold temperature. in the crystalline PP polymer, TWCD method has higher warpage than RCHD method and show the result to be a bit more uniform cooling. RCHD method has higher warpage than TWCD method as cooling time and packing time increases and TWCD method has higher warpage than RCHD method as mold temperature increases.

A cooling system that applies impinging jet is studied. To create a jet, a square edge type nozzle is used as its shape. The impinging jet that composes a cooling system which applies impinging jet is created in the nozzle plate that correspond to each LED where the cooling area exists. The distance(d) between the nozzle plate and LED plate with heat sink is where the LED light is established. The main variation and the standard is examined for four different cases through the way out diameter of nozzle plate exit(D). The examined velocity distribution and temperature distribution about the impinging jet cooling system consisted of nozzle plate. It was found that an individual LED consisting of nozzle plate was efficient.

여름철 고온기 온실 내 효율적 증발냉방을 위하여 다량 포그 분무가 가능하고 설치비용이 저렴하도록 한 터보팬 2류체 노즐로 포그 분무장치를 구성하고 소형 유리온실에 2.2 m 높이로 설치하여 냉방시험을 실시하였다. 이 장치의 분무시험 결과 평균분무입경이 29 ㎛이고 1대당 포그 분무량은 160 ㎖/min로 비산반경 2 m이내에서 입자들이 모두 증발하는 것으로 나타났다. 이 장치를 평면적 228 ㎡인 단동 유리온실에 2대를 설치하여 냉방실험한 결과, 외기의 온도 30.2℃, 상대습도 81.2%인 때 온실 내 공기의 온도 28.8℃, 상대습도 87.5%의 낮은 냉각효과를 나타내었다. 문헌 조사와 냉방실험 결과로부터 여름철 우리나라 남부지역의 외기온 35℃를 기준으로 단동온실은 50% 차광에서 증발냉각에 의해 온실 내 공기온도를 외기온보다 2∼3℃ 낮추려면 환기회수 1회/분, 물분무량은 10 ㎖/min/㎡인 것으로 추정되었다.

이 연구에서는 선박용 팬일유니트의 엇갈림 냉각관 주위 유동특성을 실험적으로 고찰하였다. 입자영상유속계를 이용하여 입구유속기준 레이놀즈수 Re = 1.5×103에서 Re = 2.5×103까지 계측결과를 얻었다. 그 곁과 유동은 흐름방향으로 빠른 속도로 발달하여 비교적 짧은 거리 후방에 공간적인 주기성을 나타내었다. 유동이 발달하는 영역에서는 레이놀즈수에 의존하는 경향이 크게 나타났으나 공간적 주기성에 미치는 레이놀즈수의 영향은 크지 않았다.

Recently, it was a very interesting subject to reduce the weight of the parts in the whole industry. A number of manufacturers have tried to reduce the weight as making light material alloy like aluminium and magnesium alloys. Agitation system can maximize the density of melted metal alloy and improve the mechanical property. Ultrasonic agitation system is considered as the method of agitation for making aluminium alloy product. In this study, I've designed the cooling unit of the ultrasonic agitation system. The design of the cooling unit was made through the analysis of the thermal behavior and thermal stress of the agitation system. The results of analysis showed that the cooling units must be applied to the agitation system. They also showed the flux of the cooling water and the effects of the cooling system.

별도의 엔진 구동형 소형 패키지 해수냉각시스템을 개발하기 위하여 압축기 회전수와 냉각수 유량 및 온도, 냉수 유량을 파라미터로 장치의 운전 특성을 파악한 결과 다음과 같은 결론을 얻었다. (1) 압축기 회전수와 증발기의 냉수 및 응축기의 냉각수 유량이 증가할수록 장치의 냉동능력은 증가하였으며, 압축기 회전수 및 냉각수 온도가 증가할수록 구동엔진의 연료소비량도 증가하였다. (2) 압축기 회전수와 냉각수 및 냉수의 유량이 증가할수록 냉각시스템의 성능계수는 증가하였으며, 냉각수 온도 및 압축기 회전수가 감소함에 따라서는 감소하였다. (3) 별도 엔진 구동용 소형 해수냉각장치 개발 및 운전조건 변화에 따른 시스템의 특성과 운전조건변화의 상관 관계를 파악할 수 있었으며, 시스템의 상용화 설계를 위한 기초자료를 얻을 수 있었다.

The objective of this study was to manufacture the sea water cooling apparatus for fish hold storage to extend the freshness of fish. Using the sea water cooling apparatus manufactured, it makes observations on the physicochemical and sensual properties of mackerel such as ATP and its related compounds, K-value, VBN, TMA, TBA, salt-concentration and skin color through storage. The results of this investigation showed that the values of physicochemical properties such as ATP and its related compounds, K-value, VBN, TMA, TBA increased gradually during storage in sea water cooling apparatus manufactured and the changes of skin color was inhibited also. From these results, it could be suggested that developed sea water cooling apparatus is effective in shelf-life extension of fishes.

산업체에서 사용하고 있는 칠러 냉각 장치에는 침전물이나 부유물이 많이 발생한다. 칠러 냉각장치에 마그네슘을 적용시켰을 때 나타나는 냉각수와 침전물 및 부유물의 변화를 연구하기 위하여 ICP-AES, IC, XRD, SEM 분석을 실시하였다. 칠러 냉각장치에 Mg를 적용할 경우 대부분의 용해 성분이 감소하는 경향을 보여주고 있어 냉각수의 수질이 상당히 개선되었다. 또한 유기물 형태로 존재하던 부유물이나 침전물이 거의 생성되지 않아 유기물 생성을 억제시키는 효과도 있는 것으로 판단된다.