• Title, Summary, Keyword: 부분부하 성능

Search Result 166, Processing Time 0.04 seconds

A Study on Partial Load Performance of Absorption Type Heat Pump for Waste Heat Recovery of Closed Cooling Water (기기냉각수 폐열회수용 흡수식 히트펌프의 부분부하 성능에 관한 연구)

  • Park, Byungchul;Kim, Taehyeong;Kim, Kwangsu
    • Journal of Energy Engineering
    • /
    • v.28 no.2
    • /
    • pp.47-54
    • /
    • 2019
  • As absorption type heat pump for waste heat recovery is installed in combined cycle power plant for Energy Service Company, performance test is implemented to confirm the operation data on partial load. The operation data changes according to the heat pump operation on partial load are as follows. Total heat output increases, because waste heat of closed cooling water and a portion of LP steam from HRSG is supplied. But electric power output of steam turbine is reduced, because LP steam to steam turbine is reduced. And heat output from HP district heater and LP district heater is reduced, because HP turbine exhaust steam to HP district heater and LP district heater is reduced. On partial load operation, turbine output reduction is higher than the base load operation. Therefore, on partial load, heat pump should be operated in consideration of the heat output increase and electric power output reduction.

Flow Control of a Centralized Cooling Plant for Energy Saving (중앙식 냉방 플랜트의 유량제어를 통한 에너지 절감에 관한 연구)

  • Lee, Jeong Nam;Kim, Young Il;Chung, Kwang Seop
    • Journal of Energy Engineering
    • /
    • v.24 no.3
    • /
    • pp.48-54
    • /
    • 2015
  • In a centralized cooling plant, precise mechanical design and control strategy are required for peak and partial cooling load management. Otherwise, it will lead to low efficiency of cooling system and energy loss due to low partial load efficiency. The purpose of this paper is to enhance energy performance of the centralized cooling plant by controlling flow system in an industrial building using measured data and energy performance simulation program. The simulation results show that the proposed flow control can cut down annual electric power consumption by about 17% compared with the conventional cooling system.

Effect on Thermal Performance of Superheater Module under Part Load Operation in HRSG (배열회수보일러의 부분부하 운전에 따른 유동불균일이 과열기의 성능에 미치는 영향)

  • Chong, Chae-Hon;Song, Jung-Il
    • Journal of Energy Engineering
    • /
    • v.17 no.3
    • /
    • pp.161-166
    • /
    • 2008
  • The purpose of this study is to apprehend the behavior of exhaust gas flow from gas turbine during part load operation in Heat Recovery Steam Generator. As a first step of this work, internal flow characteristics according to HRSG types were examined by CFD analysis. Next step, tube temperature according to gas turbine 53% and 100% load conditions were calculated by results of CFD and those were compared with temperature data gathered from real plant. Finally, thermal performance due to part load operation was calculated to estimate the influence of heat transfer in superheater. In addition, new type of device is suggested to eliminate the uneven temperature distribution of tubes during part load operation.

Performance Characteristics of a Variable Displacement Engine at Part-Load and Idle (부분부하와 무부하에서의 가변 배기량기관의 성능특성)

  • 한성빈;이성열
    • Transactions of the Korean Society of Mechanical Engineers
    • /
    • v.18 no.1
    • /
    • pp.232-239
    • /
    • 1994
  • This paper presents an effective way of improving fuel consumption for a variable displacement engine. The improvement of fuel consumption can be accomplished by means of deactivating inlet and exhaust valves, reducing the number of effective cylinders of a four-cylinder gasoline engine that is mounted on a domestic compact automobile.

Dynamic Marignal Load Balancing on Cluster System (클러스터 시스템에서의 동적 여분 부하 균등화)

  • 정훈진;최상방
    • Proceedings of the Korean Information Science Society Conference
    • /
    • /
    • pp.606-608
    • /
    • 2000
  • 네트워크의 속도가 빨라짐에 따라 저비용으로 고성능의 성능을 얻고자 하는 클러스터 시스템에 대한 연구가 많아지고 있다. Fast Ethernet, ATM, Myrient, SCI와 같은 고성능 네트워크 시스템이 많이 사용되고 있다. 기존 분산시스템에의 부하 불균등 문제가 이런 클러스터 시스템에서도 역시 문제시 되고 있다. 일반적인 동적 부하균등화 방법은 실행시간중에 노드들의 부하량에 대한 정보를 얻어 전체 노드들이 평균의 부하량에 수렴하도록 하는 것을 목적으로 한다. 그러나, 통신비용과 노드 복잡도에 따라 완벽한 부하균등화를 하는 것이 효율적인 부하균등화를 얻는 것이 아니다. 부하균등화 노드 복잡도에 따라 완벽한 부하듄등화를 하는 것이 효율적인 부하균등화를 얻는 것이 아니다. 부하균등화 비용이 클때는 완벽한 부하균등화보다는 이득률이 크도록 하는 부분적 부하 균등화가 더 효율적일 수 있다. 본 논문에서는 클러스터 시스템을 모델링하고 이에 적합한 부분적 동적 부하 균등화 모델을 제시한다.

  • PDF

A Dynamic Simulation and Real-Time Linear Simulation for Mid-Class Civil Aircraft Turbofan Engine (중형항공기용 터보팬 엔진의 동적모사 및 실시간 선형모사)

  • 공창덕;기자영;고광웅
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • /
    • pp.6-6
    • /
    • 1998
  • 중형항공기용 터보팬 엔진의 정상상태 및 천이상태 성능을 해석하고 제어기 설계를 위한 선형모델을 구하였다. 정상상태 성능해석은 설계점으로 선정한 지상정지조건과 최대상승조건(Mach=0.78, 고도=36000ft) 및 순항조건(Mach=0.78, 고도=39000ft)을 고려하였으며, 저압압축기의 공회전 상태에서 최대 회전속도까지의 부분부하성능해석을 수행하였다. 부분부하 성능해석 결과 90% RPM 조건에서 가장 연료소모율이 적어 경제적임을 알 수 있다. 동적 성능모사는 각각의 대기조건에서 연료가 Step 증가, Ramp 증가 및 감소, Step 증가 후 Ramp 감소하는 경우에 대해 수행하였다. 모사결과 고려된 모든 조건에서 연료의 Step 증가시 고압압축기의 터빈입구온도가 제한온도를 초과하여, 보다 빠른 가속과 최적의 성능을 위해서는 적절한 제어가 필요함을 알 수 있었다. 또한 최대상승조건에서 연료를 Step 증가시킬 경우 고압압축기에서 실속이 발생하여 이에 대한 대책도 필요함을 알 수 있었다.

  • PDF

Analysis of Operating Characteristics of 200kW Class Micro Gas Turbine (200kW 급 마이크로 가스터빈의 운전특성 분석)

  • Kim, Jeong Ho;Kang, Do Won;Kim, Tong Seop
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.37 no.11
    • /
    • pp.1015-1022
    • /
    • 2013
  • This study simulates the operation of a 200 kW class micro gas turbine that is currently under development. The performance and operating characteristics depending on the load control scheme (constant turbine inlet temperature versus constant turbine exit temperature) and ambient condition were investigated using detailed component performance data. The sensitivities of operating parameters, such as the compressor surge margin and flow path temperatures, according to unit fuel flow change were predicted for a wide load range. The sensitivity analysis showed that the steady state calculation provided useful information about the maximum surge margin reduction during load change.

空氣調和機 및 熱펌프에 對한 斷續運轉性能 및 季節의 表示方法

  • 민만기
    • Journal of the KSME
    • /
    • v.22 no.5
    • /
    • pp.341-349
    • /
    • 1982
  • 소비자에게 이러한 마침표에 대한 사전지식을 주는 공기조화. 냉동기계의 성능평가방법에서는 쉴 사이없이 변동하는 외기온도에서의 성능과 부분부하의 단속운전(cyclic operation)에서의 성능을 밝혀주고 이를 기초로 해서 공조기 또는 열펌프의 계절성능을 밝혀주여야 될 것이다. 여기서는 그러한 새로운 계절성능의 평가절차 및 방법 중에서 계절성능을 표시하는 방법과 용어에 대해서 만 해설을 하고자 한다.

  • PDF

Part Load Performance Characteristics according to Inlet Valve Angle (흡입 밸브 각도에 따른 엔진 부분부하 성능 특성)

  • Lee, Jung-Man;Lee, Jae-Won;Kim, Hyeong-Sig;Kwon, Soon-Tai;Park, Chan-Jun;Ohm, In-Yong
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
    • /
    • /
    • pp.161-166
    • /
    • 2008
  • This paper searched through mixture ratio response test whether exert effect that is some in part load performance of engine according to inlet valve angle in gasoline engine. Engines that inlet valve angle is narrow decreased quantity of NOx among exhaust gas than engine that inlet valve angle is wide, and ignition timing was retard, and fuel consumption improved a little. That quantity of NOx among exhaust gas decreases and ignition timing was retard can judge that fast burning occurred. Fast burning can decrease output decline and misfire that can happen at lean burning. Can be judged by thing which engine's combustion performance improves if inlet valve angle is narrow if examine test result.

  • PDF

Analysis of Relationship Between Design and Part Load Performance of Gas Turbines (가스터빈의 설계 성능과 부분부하 성능 사이의 상관관계 분석)

  • Kim, Dong-Seop
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.26 no.8
    • /
    • pp.1164-1171
    • /
    • 2002
  • This study analyzed the dependence of part load performance of simple cycle gas turbines on their design performance. Various parametric calculations were carried out to examine effects of design temperature ratio, pressure ratio and component efficiencies using a simplified analysis. In addition, a more practical analysis was done for realistic design conditions with the aid of a comprehensive performance analysis program. The results show that gas turbines with higher design performance exhibit less efficiency degradation during part load operation. The influence of power control method (fuel only centre) and air flow control) on part load performance was examined as well.