• Korean Journal of Air-Conditioning and Refrigeration Engineering
• /
• v.15 no.2
• /
• pp.116-125
• /
• 2003

The new HVAC system to lower the conveyance energy and building height using IAV (Increasing Air Volume) technique is developed. IAV units which are equipped in each zone carry out air-conditioning and supply fresh air by induction of outdoor air in main duct. The design program which decides size of OAHU and IAV unit according to air conditioning load and fresh air demand of each zone is presented. The control system is developed to operate efficiently HVAC system and IAV unit, so that individual zone operation and well-deal with partial load and IAQ problem are possible. The new system is investigated in model building and makes more profit in conveyance energy, size of air conditioning facilities room and building height than VAV system. But in construction cost it is worse by about 15 per-centage.

• Proceedings of the SAREK Conference
• /
• 2007.11a
• /
• pp.58-63
• /
• 2007

Lots of needs are being paid for how to design HVAC system in large-scale buildings. Increasing awareness of energy use is main point of this research. HVAC systems' energy characteristics are not clearly identified and understood, so the optimal design of HVAC system is very important. The energy parameters of HVAC design that are system input energy, water/air moving equipments (pumps/fans) energy and outdoor air conditioning energy for IAQ are important. The purpose of this study is to provide the basic data for energy conservational HVAC design strategies.

• Journal of the Korean Society for Marine Environment & Energy
• /
• v.12 no.1
• /
• pp.1-8
• /
• 2009

EMMC(Entrapped Mixed Microbial Cell) process which is a kind of active cell immobilizing method was applied to treat fisheries processing wastewater biologically. Kinetic constants were calculated for organic and nitrogen removal and effect of effluent recycling on system performance was evaluated also. Yield coefficient, Y showed relatively low value compared with Y value obtained from conventional activated sludge process. It means that EMMC process can reduce amount of excess sludge significantly compared with conventional activated sludge process. Endogenous respiration coefficient $k_e$ of EMMC process also showed relatively low value compared with that of conventional activated sludge process. Yield coefficient Y, endogenous respiration coefficient $k_e$ and half saturation constant $k_s$ obtained from EMMC process in terms of nitrification were compared with reported value from literature based on suspended growth nitrification system. The value of Y obtained from this study has no difference compared with values obtained from literature review and $k_e$ of this study was low but $k_s$ of this study was high compared than values obtained from suspended growth nitrification system. To evaluate the effect of internal recycling on system performance, system was operated with internal recycling ratio of 1.5Q, 2.0Q, 2.5Q and 3.0Q. increase of internal recycling ratio effect more greatly on improvement of denitrification efficiency than that of nitrification efficiency. Accordingly, optimization of internal recycling ratio has to be based on improvement of anoxic reactor performance.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
• /
• v.25 no.5
• /
• pp.255-260
• /
• 2013

Since a chilled beam system can reduce the conveyance energy for air conditioning and has many advantages in terms of constructability and indoor environment, its supply has been rapidly expanding mainly in Europe. For this chilled beam system to be effectively available in Korea, a product suitable for the domestic climatic environment and HVAC system operating conditions needs to be developed. Also, domestic products need to have an edge in cost competitiveness compared to overseas products. In this study, the induction structure of a chilled beam is deduced and an analysis on the induction performance is carried out while the chilled beam system that meets domestic situations is in the process of development.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
• /
• v.31 no.1
• /
• pp.9-14
• /
• 2002

산업의 발전에 따른 도시화의 영향으로 대도시에서는 가용공간을 확보하기 위하여 건물의 고층화와 지하공간의 개발이 활발하게 이루어지고 있다. 최근 증가추세에 있는 초고층주상복합건물, 초고층아파트는 건물의 높이가 증가함으로 인하여 건축공사비의 증가는 물론 설비적인 측면에서는 저층부의 수압이 상승 하여 높은 수압과 수격작용(water hammer)에 대한 배관 및 기기의 내압강도와 안전대책이 요구된다. 또한 건물의 초고층화로 인하여 열원에서 공조기까지, 공조기에서 실내기기까지의 수직거리 (vertical distance)가 길어지게 되어 연장된 공조덕트 및 배관 의 길이로 인해 반송동력비의 상승에도 큰 영향을 미치게된다. 이러한 문제점을 해결하기 위하여 기기 및 재료의 선정시 내압을 고려하거나 기기의 적정배치와 조닝(zoning)을 통해 상기의 문제점을 해결하는 방법을 적극 채용하고 있다. 하지만 보다 근본적인 문제해결 방법으로 건물의 층고저감에 의한 건축공사비 및 연 간운전비의 절감을 통한 건물에서의 소비에너지량 감소로 부존자원이 부족한 우리나라의 에너지수급정책에 기여하여야 할 것이다. 본 고에서는 건축물의 층고저감 효과를 얻을 수 있는 공조시스템에 대해 전반적으로 기술하고자 한다.

• Proceedings of the KIPE Conference
• /
• 2006.06a
• /
• pp.104-106
• /
• 2006

LCD 원판이 세대별로 대형, 중량화됨에 따라 제조 공정라인의 자동 반송장비도 대형화 되어 가고 있는 추세다. 기존 스토커는 주행축에 회전형 모터와 기계적 동력변환 장치를 사용하고 있어, 복잡한 구조와 기계적 마찰에 의한 잦은 유지, 보수가 필요하게 되고 파티클 발생을 최소화 시켜야 하는 문제점을 안고 있다. 따라서 이런 문제점들을 해결하기 위해, 본 논문에서는 횡자속 선형전동기를 적용하고 제안된 제어 알고리즘 및 제어기, 전력변환장치를 제작해서 대형, 고출력, 장거리화 되고 있는 스토커의 주행축에 실험, 검증하였다.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.11 no.5
• /
• pp.471-479
• /
• 2006

Automatic transfer equipments of manufacturing and process line trend toward big size as LCD glass is big size, heavy weight. The conventional stocker uses rotational motor and mechanical power converter device as travel axis of stocker crane and then frequent maintenances by complex structure and mechanical friction are required. Also it has problem to minimize the particle generation. To solve these problems, this paper verified the performance of permanent magnet(PM) excited transverse flux linear motor(TFLM) that is big power density per unit volume applied for travel axis of 7 generation stocker that is being big size, high power, long distance by the experiment based on proposed control algorithm, controller and power converter device.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.10 no.3
• /
• pp.463-469
• /
• 2009

We performed the experimental study on the control of suspended dust in a cement packaging process for various ventilation systems. To effectively remove the dust generated in the cement packaging process, three different kinds of ventilation system, such as local exhaust ventilation, electrostatic scrubber, and local air supply system, were adopted. Dust concentrations in the packaging process were measured with the variation of the airflow rate of the ventilation systems and then their ventilation performance were evaluated. From the results, we knew that the ventilation performance was the best when the local exhaust ventilation and the electrostatic scrubber were simultaneously operated in the packaging process. In the electrostatic scrubber system, the effect of the airflow rate on the indoor dust removal efficiency was negligible so hat he system ust be operated at $2,700m^3/h$ for saving power consumption.