The Experts below are selected from a list of 120996 Experts worldwide ranked by ideXlab platform

Yongqiang Feng - One of the best experts on this subject based on the ideXlab platform.

  • developing orc engineering simulator orces to investigate the working Fluid Mass flow rate control strategy and simulate long time operation
    Energy Conversion and Management, 2020
    Co-Authors: Kuocheng Pang, Yongqiang Feng, Tzuchen Hung, Chihhung Lin, Kinwah Wong
    Abstract:

    Abstract Based on the experimental data of R245fa, R123 and their mixtures, the engineering simulator for a 3 kW organic Rankine cycle (ORC) test rig by 3KeyMASTER (3KM) simulation platform is constructed. The simulation behaviors of the pump and expander are examined and validated with the experimental results, while the effect of Mass flow rate is addressed. Meanwhile, human machine interface (HMI) monitor system and superheat control system are developed. The system behaviors at three different control strategies are discussed, while a further investigation of long-time operation test under varying heat source temperature and environmental temperature is explored. Results demonstrated that an optimum operation condition could be obtained for the proposed superheat control strategy. The VFD control strategy is preferred for small-scale ORC. The superheat control methodology is a good approach to adjust the working Mass flow rate to reflect the heat source and sink temperature variation. The best operation is 0.67R245fa/0.33R123 at environmental temperature of 293 K with the net power of 1.78 kW and system efficiency of 5.14%. It indicates that the organic Rankine cycle engineering simulator (ORCES) is a good tool to predict the ORC operation characteristic, which could further guide advanced evaluation and the long time-varying cases.

  • operation characteristic of a r123 based organic rankine cycle depending on working Fluid Mass flow rates and heat source temperatures
    Energy Conversion and Management, 2017
    Co-Authors: Yongqiang Feng, Tzuchen Hung, Shanglun Wu, Bingxi Li, Kuochen Huang
    Abstract:

    Abstract The test and operation characteristic of an organic Rankine cycle using R123 and a scroll expander have been investigated. The steady-state operation characteristic is addressed with the varying working Fluid Mass flow rates ranging of 0.124–0.222 kg/s and heat source temperatures ranging of 383.15–413.15 K. The behaviors and detailed discussion for those four major components (pump, evaporator, expander and condenser) are examined. The experimental results show that the environmental temperature presents a higher influence on the pump behaviors. The range of pump power consumption, isentropic efficiency and back work ratio are 0.21–0.32 kW, 26.76–53.96%, and 14–32%, respectively. The expander isentropic efficiency presents a slight decrease first and then a sharp increase with Mass flow rate, while a degree of superheating more than 3 K is necessary to avoid expander cavitation. The expander isentropic and generator efficiencies are in range of 69.10–85.17% and 60–73%, respectively, while the respective heat transfer coefficients for evaporator and condenser are ranging of 200–400 and 450–2000 W/m2 K. The maximum expander shaft power and electrical power are 2.78 kW and 2.01 kW, respectively, while the maximum system generating efficiency is 3.25%. Moreover, the tested thermal efficiency presents a slight decrease trend with Mass flow rate.

Kuochen Huang - One of the best experts on this subject based on the ideXlab platform.

  • operation characteristic of a r123 based organic rankine cycle depending on working Fluid Mass flow rates and heat source temperatures
    Energy Conversion and Management, 2017
    Co-Authors: Yongqiang Feng, Tzuchen Hung, Shanglun Wu, Bingxi Li, Kuochen Huang
    Abstract:

    Abstract The test and operation characteristic of an organic Rankine cycle using R123 and a scroll expander have been investigated. The steady-state operation characteristic is addressed with the varying working Fluid Mass flow rates ranging of 0.124–0.222 kg/s and heat source temperatures ranging of 383.15–413.15 K. The behaviors and detailed discussion for those four major components (pump, evaporator, expander and condenser) are examined. The experimental results show that the environmental temperature presents a higher influence on the pump behaviors. The range of pump power consumption, isentropic efficiency and back work ratio are 0.21–0.32 kW, 26.76–53.96%, and 14–32%, respectively. The expander isentropic efficiency presents a slight decrease first and then a sharp increase with Mass flow rate, while a degree of superheating more than 3 K is necessary to avoid expander cavitation. The expander isentropic and generator efficiencies are in range of 69.10–85.17% and 60–73%, respectively, while the respective heat transfer coefficients for evaporator and condenser are ranging of 200–400 and 450–2000 W/m2 K. The maximum expander shaft power and electrical power are 2.78 kW and 2.01 kW, respectively, while the maximum system generating efficiency is 3.25%. Moreover, the tested thermal efficiency presents a slight decrease trend with Mass flow rate.

Tzuchen Hung - One of the best experts on this subject based on the ideXlab platform.

  • developing orc engineering simulator orces to investigate the working Fluid Mass flow rate control strategy and simulate long time operation
    Energy Conversion and Management, 2020
    Co-Authors: Kuocheng Pang, Yongqiang Feng, Tzuchen Hung, Chihhung Lin, Kinwah Wong
    Abstract:

    Abstract Based on the experimental data of R245fa, R123 and their mixtures, the engineering simulator for a 3 kW organic Rankine cycle (ORC) test rig by 3KeyMASTER (3KM) simulation platform is constructed. The simulation behaviors of the pump and expander are examined and validated with the experimental results, while the effect of Mass flow rate is addressed. Meanwhile, human machine interface (HMI) monitor system and superheat control system are developed. The system behaviors at three different control strategies are discussed, while a further investigation of long-time operation test under varying heat source temperature and environmental temperature is explored. Results demonstrated that an optimum operation condition could be obtained for the proposed superheat control strategy. The VFD control strategy is preferred for small-scale ORC. The superheat control methodology is a good approach to adjust the working Mass flow rate to reflect the heat source and sink temperature variation. The best operation is 0.67R245fa/0.33R123 at environmental temperature of 293 K with the net power of 1.78 kW and system efficiency of 5.14%. It indicates that the organic Rankine cycle engineering simulator (ORCES) is a good tool to predict the ORC operation characteristic, which could further guide advanced evaluation and the long time-varying cases.

  • operation characteristic of a r123 based organic rankine cycle depending on working Fluid Mass flow rates and heat source temperatures
    Energy Conversion and Management, 2017
    Co-Authors: Yongqiang Feng, Tzuchen Hung, Shanglun Wu, Bingxi Li, Kuochen Huang
    Abstract:

    Abstract The test and operation characteristic of an organic Rankine cycle using R123 and a scroll expander have been investigated. The steady-state operation characteristic is addressed with the varying working Fluid Mass flow rates ranging of 0.124–0.222 kg/s and heat source temperatures ranging of 383.15–413.15 K. The behaviors and detailed discussion for those four major components (pump, evaporator, expander and condenser) are examined. The experimental results show that the environmental temperature presents a higher influence on the pump behaviors. The range of pump power consumption, isentropic efficiency and back work ratio are 0.21–0.32 kW, 26.76–53.96%, and 14–32%, respectively. The expander isentropic efficiency presents a slight decrease first and then a sharp increase with Mass flow rate, while a degree of superheating more than 3 K is necessary to avoid expander cavitation. The expander isentropic and generator efficiencies are in range of 69.10–85.17% and 60–73%, respectively, while the respective heat transfer coefficients for evaporator and condenser are ranging of 200–400 and 450–2000 W/m2 K. The maximum expander shaft power and electrical power are 2.78 kW and 2.01 kW, respectively, while the maximum system generating efficiency is 3.25%. Moreover, the tested thermal efficiency presents a slight decrease trend with Mass flow rate.

Ya Zheng - One of the best experts on this subject based on the ideXlab platform.

  • Preliminary design and off-design performance analysis of an Organic Rankine Cycle for geothermal sources
    Energy Conversion and Management, 2015
    Co-Authors: Ya Zheng, Jiangfeng Wang, Yiping Dai
    Abstract:

    Abstract Geothermal Fluid of 90 °C and 10 kg/s can be exploited together with oil in Huabei Oilfield of China. Organic Rankine Cycle is regarded as a reasonable method to utilize these geothermal sources. This study conducts a detailed design and off-design performance analysis based on the preliminary design of turbines and heat exchangers. The radial inflow turbine and plate heat exchanger are selected in this paper. Sliding pressure operation is applied in the simulation and three parameters are considered: geothermal Fluid Mass flow rate, geothermal Fluid temperature and condensing pressure. The results indicate that in all considered conditions the designed radial inflow turbine has smooth off-design performance and no choke or supersonic flow are found at the nozzle and rotor exit. The lager geothermal Fluid Mass flow rate, the higher geothermal Fluid temperature and the lower condensing pressure contribute to the increase of cycle efficiency and net power. Performance maps are illustrated to make system meet different load requirements especially when the geothermal Fluid temperature and condensing pressure deviate from the design condition. This model can be used to provide basic data for future detailed design, and predict off-design performance in the initial design phase.

  • Off-design performance comparison of an organic Rankine cycle under different control strategies
    Applied Energy, 2015
    Co-Authors: Ya Zheng
    Abstract:

    This paper presents the off-design performance analysis of an organic Rankine cycle system in the view of control strategies. Variable inlet guide vanes and evaporating pressure are considered as control variables to adapt the system to the variable geothermal Fluid Mass flow rate and temperature. The optimal control strategy is studied to maximize the net power under the given geothermal source conditions. The constant pressure operation, the sliding pressure operation and the optimal control strategy are compared in order to analyze their differences. The results indicate that the constant pressure operation with variable inlet guide vanes generates more net power than the sliding pressure operation when the geothermal Fluid Mass flow rate is relative low. The optimal control strategy is determined by the off-design performance of evaporator and turbine. With fixed geothermal Fluid temperature and variable geothermal Fluid Mass flow rate, the potential increase of the net power under the optimal operation can reach 4.7% and 11.0% for the constant and sliding pressure operation, respectively. When the geothermal Fluid temperature decreases, the curve of net power tends to shift to the direction of larger geothermal Fluid Mass flow rate in all control strategies.

Kinwah Wong - One of the best experts on this subject based on the ideXlab platform.

  • developing orc engineering simulator orces to investigate the working Fluid Mass flow rate control strategy and simulate long time operation
    Energy Conversion and Management, 2020
    Co-Authors: Kuocheng Pang, Yongqiang Feng, Tzuchen Hung, Chihhung Lin, Kinwah Wong
    Abstract:

    Abstract Based on the experimental data of R245fa, R123 and their mixtures, the engineering simulator for a 3 kW organic Rankine cycle (ORC) test rig by 3KeyMASTER (3KM) simulation platform is constructed. The simulation behaviors of the pump and expander are examined and validated with the experimental results, while the effect of Mass flow rate is addressed. Meanwhile, human machine interface (HMI) monitor system and superheat control system are developed. The system behaviors at three different control strategies are discussed, while a further investigation of long-time operation test under varying heat source temperature and environmental temperature is explored. Results demonstrated that an optimum operation condition could be obtained for the proposed superheat control strategy. The VFD control strategy is preferred for small-scale ORC. The superheat control methodology is a good approach to adjust the working Mass flow rate to reflect the heat source and sink temperature variation. The best operation is 0.67R245fa/0.33R123 at environmental temperature of 293 K with the net power of 1.78 kW and system efficiency of 5.14%. It indicates that the organic Rankine cycle engineering simulator (ORCES) is a good tool to predict the ORC operation characteristic, which could further guide advanced evaluation and the long time-varying cases.