• 한국음향학회지
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• 제33권2호
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• pp.111-117
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• 2014

본 논문은 전자장비의 구조기인소음 (structure-borne noise)의 실험적 저감방안 검토에 대한 내용을 다루었다. 수냉식 전자장비의 유일한 소음원인 냉각장치를 목업(mock-up)으로 제작하여 소음 특성을 파악하였으며, 전원에 의한 영향, 구조체 강성에 의한 영향, 팬 고정부위의 절연에 의한 효과, 마운트의 공진주파수가 미치는 영향 등에 대한 검토를 수행하였다. 이를 반영하여 제작된 전자장비 프로토타입의 소음 특성을 파악하였으며, 구조기인소음을 저감시키기 위하여 작동회전수(rpm) 조합, 마운트 종류 및 설치방법 등에 대하여 검토하였다. 냉각팬 작동 주파수의 1차, 4차 성분에 의하여 소음이 크게 발생하며, 구조체 강성증가, 팬 고정부위 절연, 마운트 공진주파수 저하, 작동회전수조합, 마운트 선정방법 등에 의하여 전자장비의 구조소음을 저감시킬 수 있음을 확인하였다.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2009년도 하계학술발표대회 논문집
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• pp.236-241
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• 2009

After analyzing the characteristics of the cooling dryer, the mixed cooling dryer was developed by adding the desiccant dryer which supplement the cooling dryer's demerits. Also, the hybrid desiccant cooling dryer was developed to use effectively the exhaust heat energy of the cooling dryer. It could make a more that 20 percent reduction in energy compared with the mixed desiccant cooling dryer. It has become essential to supply this equipment and search the suitable drying product.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2008년도 하계학술발표대회 논문집
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• pp.60-65
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• 2008

The near-optimal control algorithm for central cooling and heating system has been developed for minimizing energy consumption while maintaining the comfort of indoor thermal environment in terms of the environmental variables such as time varying indoor load and outdoor temperatures. The optimal set-points of control parameters with near-optimal control are supply air and chilled or hot water temperatures. The near optimal control algorithm has been implemented by using LabVIEW program in order to analyze energy performance for central cooling and heating control system.

• 한국지열·수열에너지학회논문집
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• 제6권1호
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• pp.1-7
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• 2010

In this paper, an experimental study on the cooling operation characteristics for different entering water temperatures in geothermal heat pump system are carried out by using Lab VIEW system program Set-point temperature controls for cooling water and supply air temperatures is applied to analyze the energy consumption and control performances. As a result, the system responses show that different entering water temperatures(EWT) effect greatly on the energy consumption and system COP.

• 한국지열·수열에너지학회논문집
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• 제15권4호
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• pp.39-45
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• 2019

The operational conditions such as cooling tower water pump flow rate, cooling tower fan flow rate, and chiller capacity in heat source equipment, and supply air temperature and chilled water temperature in air conditioner are considered to study the effects on energy consumption for central cooling system by using TRNSYS program. As a result, the optimal values of supply air temperature and chilled water temperature for minimal total energy consumption are 12℃ and 8℃. And if maximum values of cooling tower water pump and fan flow rate is decreased from 100% to 40%, energy consumptions are increased 170MJ/day and 63.2MJ/day, respectively.

• 설비공학논문집
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• 제18권1호
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• pp.24-30
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• 2006

Three liquid cooling heat exchangers for cooling of telecommunication equipment were designed and their cooling performances were tested. The liquid cooling heat exchangers had twelve rectangular channels $(5\times3 mm)$ with different flow paths of 1, 4, and 12. Silicon rubber heaters were used to provide heat flux to the test section. Heat input was varied from 75 to 400 W, while flow rate and inlet temperature of working fluid were altered from 1.2 to 4.0 liter/fin and from 15 to 3$30^{\circ}C$, respectively. The 4-path heat exchanger showed lower and more uniform average inner temperatures between heaters and the surface of heat exchanger than those of the others. To obtain optimal distribution of working fluid to each channels of liquid cooling heat exchangers, 2-3-2 and 4-3 type tube distributors were designed, and their distribution performances of working fluid were numerically and experimentally investigated. The distributor of the 2-3-2 type showed superior distribution performance compared with those of the 4-3 type distributor.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2006년도 하계학술발표대회 논문집
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• pp.506-511
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• 2006

To today with the acceleration due to the preference actual condition of high-class energy national income level it is together improving. It follows hereupon and it is convenient and the neat heat source is increasing a tendency where it is. It investigates the government offices building in commerce portion from the research which it sees and from the draft it analyzes a coat dosage. And comparison it analyzes the movable present condition of thread use dosage and the freezer. It presents the improvement direction against enemy conditions heat source equipment selecting. Also, currently it produces the dosage of heat source equipment and application it tries. The result, the various safety rate and the premium rate which it uses universally are considered above thread using. The reappraisal for enemy conditions heat source equipment selecting which it follows hereupon is necessary.

• 한국산학기술학회논문지
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• 제15권4호
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• pp.1879-1884
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• 2014

최근 미세접합 기술이 다양한 사회에서 주목받고 있다. 미세접합 기술은 레이저 접합 초음파 접합 등이 있다. 그러나 미세 접합의 연구가 많이 부족한 실정이다. 이에 본 논문에서는 초음파 접합장치 구동 시 열평형 상태에서 압전소자에 열영향을 최소화하기 위해 냉각관을 설계하였다. 또한 냉각관이 설계된 초음파 접합 장치를 이용하여 접합 실험을 실시하였다. 다꾸찌 실험계획법을 이용하여 실험을 실시하였으며, 기초실험을 통해 공정변수와 반응 변수를 설정하였다. 접합 실험의 신뢰도를 검증하기 위하여 접합 계면의 미세조직을 관찰하였고, 인장실험을 통해 접합 강도를 확인하였다.

• 동력기계공학회지
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• 제14권4호
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• pp.5-10
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• 2010

This study was investigated the effect on operating characteristics of apparatus according to frosting and defrosting to develop of new defrosting equipment. The results showed as following. Frost was almost removed using the defrosting equipment with roll brush type that defrosting is possible under operating condition. Also, the temperature of compressor inlet, evaporator inlet and outlet showed higher value because of heat transfer resistance of cooling pipe frost comparing with defrosting condition. And the compressor work showed 10% lower and COP was presented 24% higher values than defrosting condition. Therefore, defrosting for cooling coil of refrigeration and low temperature storage was effected on operation and performance characteristics of equipment. This highly effects on real refrigeration apparatus which is operated in year-around.

• 반도체디스플레이기술학회지
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• 제11권4호
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• pp.31-36
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• 2012

The high thrust of the linear motor in the exposer generates the high temperature heat by the friction and the electromagnetic forces on its coil. It can cause the thermal deformation and the accuracy of the equipment is finally decreased which has a bad effect on the productivity. In this research, the heat and flow on the linear motor of the exposer has been analyzed. The existing equipment is non-contact fluid refrigerant type. The numerical analysis data of the existing equipment have been acquired and the reliability of the data has been verified. The revised modeling for the next-generation is suggested for cooling the exposer effectively.