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수치해석을 이용한 Fan Filter Unit (FFU)용 가이드 베인 설계
장준환(J.H. Jang),안준(J. Ahn) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.11
Fan filter unit is an air conditioning device for a clean room to provide positive indoor pressure by supplying air. A uniform velocity at the exit of the unit is required to have high productivity at the clean room, while higher flow rate is desired to save the energy. To find a guide vane to achieve these requirements, a series of numerical simulation has been conducted while changing the angle and length of the guide vane. By changing the geometry, velocity uniformity has been enhanced up to 3.7%, whilst the flow rate decreases by 1.5%. The flow rate can be increased by 2.6%, with the 2.1% penalty of the uniformity.
수치해석을 이용한 Fan Filter Unit (FFU)용 가이드 베인 형상 최적화
장준환(J.H. Jang),안준(J. Ahn),명현국(H.K. Myong) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
Fan Filter Unit(FFU) is a device which supplies clean air from ceiling in a clean room. When a big sized FFU is installed, the velocity variation between center and side of the FFU can decrease products’ quality or productivity. Therefore, a guide vane is installed inside the device in order to increase the velocity uniformity. Since the vane reduces the flow rate for a given pumping power, an optimum design is required to increase velocity uniformity and minimize flow rate reduction at the same time. To find a guide vane to achieve these requirements, a series of numerical simulation has been conducted while changing the angle and length of the center and side guide vane. By changing the geometry of the side guide vane, the velocity uniformity increased by 3.7%, and the flow rate decreased by 1.5%. With the change in the geometry of center guide vane, the velocity uniformity increased by 2.9%, and the flow rate decreased by 0.7%.
목재 펠릿 보일러 연소실 내부의 부하별 연소 및 열전달 특성
장준환(J.H. Jang),안준(J. Ahn) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
The goal of the present study is to develop a 200,000 kcal/h-class wood pellet boiler. A series of numerical simulations regarding combustion load and heat transfer characteristics inside the combustion chamber of a wood pellet boiler has been conducted. We have considered the load from 56% to 130%. The results show that a high temperature zone is at the entrance of the 2nd chamber for all combustion loads considered. The flame is stretched to the top of the 2nd chamber. The high temperature zone at the 2nd chamber becomes wider and strong for a higher load. The flow is along the partition. The high velocity region is at the exit of chamber for all combustion loads considered. Compared to experimental data, numerical simulations predict the temperature distribution for partial load operation.
13단 화격자 목재 펠릿 보일러 연소실 내부의 연소 및 열전달 특성
장준환(J.H. Jang),안준(J. Ahn),김종진(J.J. Kim) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
Present study is to develop a 200,000 kcal/h class 13-step-grate wood pellet firing boiler. A series of numerical simulations regarding combustion load and heat transfer characteristics inside the combustion chamber of a wood pellet boiler has been conducted. We have considered combustion load ranging from 56% to 130%. The results show that a high temperature zone exists at the exit of the 1st chamber for all combustion loads considered. The flame is stretched to the exit of the 2nd chamber. Combustion gas is flowing along the partition, and a recirculation zone is formed at the top of partition. Compared to experimental data, numerical simulations predict the temperature distribution for partial load operation.
장준환(J.H. Jang),안준(J. Ahn) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
The goal of the present study is to develop a 200,000 ㎉/h-class wood pellet boiler. A series of numerical simulations regarding combustion load and heat transfer characteristics inside the combustion chamber of a wood pellet boiler has been conducted. We have considered the load from 56% to 130 %. The results show that a strong recirculation zone is at the upstream corner of the chamber for all combustion loads considered. The flame is stretched to the exit of chamber. The high temperature zone near the exit of chamber becomes wider for a higher load. Compared to experimental data, numerical simulations predict the temperature distribution for partial load operation.
체인스토커 방식 목재펠릿 증기보일러의 부하 별 연소 특성
장준환(J.H. Jang),김종진(J.J. Kim),최규성(K.S. Choi),강새별(S.B. Kang),심봉석(B.S. Sim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The goal of the present study is to develop a 1 ton/h-class chain stoker type wood pellet steam boiler. A series of investigations regarding combustion load characteristics of chain stoker type wood pellet steam boiler has been conducted. We have considered the load from 60% to 120%. The results show that a high temperature zone is at the entrance of the 2nd chamber for all combustion loads considered. The flame is stretched to the top of the 2nd chamber. The maximum efficiency is 85.1% at 100% load. The CO concentration in this case is 234 ppm. The exhaust gas oxygen concentration, the higher the exhaust gas temperature tends increased.