• Title, Summary, Keyword: Part Load Performance

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Performance Simulation of Part Load Operation for 2MWe Circulating Fluidized Bed Boiler (2MWe 순환유동상 보일러의 부분 부하 운전 성능 모사)

  • Kim, Taehyun;Choi, Sangmin;Hyun, Ju-soo
    • 한국연소학회:학술대회논문집
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    • pp.35-36
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    • 2012
  • Part load operation usually covers large periods of the total operation time on the economic ground and electricity demand in small-scale boilers. Performance analysis of part load behavior is very important for the purpose of boiler operation optimization. A simple thermal calculation approach is applied to predict performance of a pilot-scale circulating fluidized bed (CFB) boiler at part load operation. Verification has been carried out by comparing between calculation results an operation data of the boiler.

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An Experimental Study on the Part-Load Performance of a River Water Source 2-Stage Heat Pump (하천수 열원 2단 압축 열펌프시스템의 부분부하 운전특성에 관한 실험적 연구)

  • Kim, Ji-Young;Baik, Young-Jin;Lee, Young-Soo;Ra, Ho-Sang
    • Proceedings of the KSME Conference
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    • pp.1964-1968
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    • 2007
  • The river water heat source heat pump has the advantage in the performance compared to air source heat pump. Although its better performance, the large temperature difference between load and source makes system performance worse by nature. In this study, 2-stage compression is considered as the solution of this problem. Generally, heat pump is designed for maximum capacity rate, but it actually operates at part load condition in many cases. Therefore, an information on the part-load character is very important in view of the system overall performance. In this study, part-load performance tests of a R134a 2-stage compression heat pump were carried out over the river water and supply heating water temperature changes. The experimental results show that the system performance is influenced by the part load rates, river water temperature, load temperature, etc.

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Comparative Part Load Performance Analysis of Gas Turbine Power Generation Systems Considering Exhaust Heat Utilization (배열 이용도를 고려한 가스터빈 발전시스템의 부분부하 성능 비교분석)

  • Kim, T. S.
    • 유체기계공업학회:학술대회논문집
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    • pp.290-297
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    • 2002
  • This paper presents analysis results for the effect of power control strategies on the part load performance of gas turbine based power generation systems utilizing exhaust heat of the gas turbine such as cumbined cycle power plants and regenerative gas turbines. For the combined cycle, part load efficiency variations were compared among different single shaft gas turbines representing various technology levels. Power control strategies considered were fuel only control and IGV control. It has been observed that gas turbines with higher design performances exhibit superior part load performances. Improvement of part load efficiency by adopting air flow modulation was analyzed and it is concluded that since the average combined cycle performance is affected by the range of IGV control as well as its temperature control principle, a control strategy appropriate for the load characteristics of the individual plant should be adopted. For the regenerative gas turbine, it is likewise concluded that maintaining exhaust temperature as high as possible by air flow rate modulation is required to increase part load efficiency.

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Part-load Performance Characteristics of a Solid Oxide Fuel Cell/Gas Turbine Hybrid Power System Operating with Various Load-following Operation Modes (부하추종 운전방법에 따른 고체산화물 연료전지/가스터빈 하이브리드 동력 시스템의 부분부하 성능특성)

  • Kim Jae-Hoon;Yang Jin-Sik;Ro Sung-Tack;Sohn Jeong-Lak
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.30 no.3
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    • pp.193-200
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    • 2006
  • The purpose of this study is to compare the part-load performance of a SOFC/GT hybrid power system with three different kinds of load-following operation modes. The primary mode for the part load operation of a hybrid power system is the reduction of supplied fuel (e.g., fuel control mode) to the hybrid system. The other two options, i.e., variable speed and VIGV controls, are related to the reduction of supplied air simultaneously with the reduction of supplied fuel to the system. With the performance analysis of a SOFC/GT hybrid power system, it is concluded that the variable speed con佐ol mode Provides the best performance for the part-load operations. It is also found that the VIGV control mode, with its better performance behavior than the fuel control mode, can be used as an important option for the part-load operation especially in case that the variable speed control mode can not be adopted.

Part-Load Performance Test of a Screw Chiller with Economizer using R22 and R407C (이코노마이저를 채용한 스크류 냉동기에서 R22와 R407C의 부분부하 성능실험)

  • 장영수;이용철;김영일
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.15 no.11
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    • pp.902-909
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    • 2003
  • Screw compressor type chillers are widely used in refrigeration for capacity over 30 RT. In general, chillers operate under part-load conditions. Therefore, information on characteristics at part-load is very important in view of chiller performance and energy economy. In this study, performance tests of part-load and economizer system using R22 and R407C have been performed for various secondary fluid temperatures. Adoption of an economizer system increased the cooling capacity and improved COP except for lower part-load condition when injection volume ratio is 1.01. For the same cooling capacity condition at part-load, COP of both non-economizer and economizer system showed similar values.

Part-load Performance of a Screw Chiller with Economizer using R22 and R407C

  • Chang, Young-Soo;Kim, Young-Il;Lee, Yong-Chul
    • International Journal of Air-Conditioning and Refrigeration
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    • v.13 no.1
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    • pp.1-10
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    • 2005
  • Screw compressor chillers are widely used in refrigeration for capacity over 30 RT. In general, chillers operate under part-load conditions during most of the time. Therefore, information on the characteristics of part-load is very important for better chiller performance and energy economy. In this study, performance tests of screw chiller with economizer using R22 and R407C under part-load conditions have been performed for various secondary fluid temperatures. Adoption of an economizer system increased the cooling capacity and improved COP except for lower part-load condition when economizer volume ratio is 1.01. For the same cooling capacity condition at part-load, COP's of both non-economizer and economizer system showed similar values.

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
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    • v.26 no.8
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    • pp.1164-1171
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    • 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.

A study on the part-load performance of 2-stage water source heat pump (2단 압축 수열원 열펌프 시스템의 부분부하 운전특성에 관한 연구)

  • Lee, Young-Soo;Baik, Young-Jin
    • Transactions of the Korea Society of Geothermal Energy Engineers
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    • v.5 no.1
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    • pp.13-17
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    • 2009
  • The river water heat source heat pump has the advantage in the performance compared to air source heat pump. In this study, an experimental study on a 2-stage heat pump, which is designed to utilize a river water heat source, were carried out. Generally, a heat pump is designed for maximum capacity rate, but it actually operates at part load condition in most cases. Therefore, an information on the part-load characteristic is very important in view of the system overall performance. In this study, part-load performance tests of a R134a 2-stage compression heat pump were carried out over the river water and supply heating water temperature changes.

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Comparative Part Load Performance Analysis of Gas Turbine Power Generation Systems Considering Exhaust Heat Utilization (배열 이용도를 고려한 가스터빈 발전시스템의 부분부하 성능 비교분석)

  • Kim, T.S.
    • The KSFM Journal of Fluid Machinery
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    • v.6 no.3
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    • pp.28-35
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    • 2003
  • This paper presents analysis results for the effect of power control strategies on the part load performance of gas turbine based power generation systems utilizing exhaust heat of the gas turbine such as combined cycle power plants and regenerative gas turbines. For the combined cycle, part load efficiency variations were compared among different single shaft gas turbines representing various technology levels. Power control strategies considered were fuel only control and IGV control. It has been observed that gas turbines with higher design performances exhibit superior part load performances. Improvement of part load efficiency of the combined cycle by adopting air flow modulation was analyzed and it was concluded that since the average combined cycle performance is affected by the range of IGV control as well as its temperature control principle, a control strategy appropriate for the load characteristics of the individual plant should be adopted. For the regenerative gas turbine, it is likewise concluded that maintaining exhaust temperature as high as possible by air flow rate modulation is required to increase part load efficiency.

Program Development for Design and Part Load Performance Analysis of Single-Shaft Gas Turbines (단축가스터빈의 설계점 및 부분부하 성능해석 프로그램 개발)

  • Kim, Dong-Seop;No, Seung-Tak
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.20 no.7
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    • pp.2409-2420
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    • 1996
  • This paper describes the development of a general program for the design and part load performance analysis of single-shaft-heavy-duty gas turbines. Efforts are made to fully represent the real component features by the characteristic models and special emphasis is put on the modeling of cooled turbine stages. The design analysis routine is applied to simulate the performance of current gas turbines and its appropriateness for system analysis is validated. Meanwhile, the component parameters of real engines which describe the technology level are obtained. The program is extended to predicting the part load operation of gas turbines with the aid of models for the off-design characteristics of compressor, turbine and other main components. Part load simulation can be carried out only with limited numbers of input data. It is demonstrated that the program accurately estimates the part load characteristics of real turbines.