The Experts below are selected from a list of 8205 Experts worldwide ranked by ideXlab platform

Jincan Chen - One of the best experts on this subject based on the ideXlab platform.

  • Performance evaluation and parametric optimization strategy of a thermocapacitive heat engine to harvest low-grade heat
    Energy Conversion and Management, 2019
    Co-Authors: Zhihui Zhang, Jincan Chen, Chao Meng, Ning Li, Yingru Zhao
    Abstract:

    Abstract A novel Stirling-like irreversible electrochemical thermo-capacitive regenerative cycle operating between a heat reservoir and a heat sink for harvesting low-grade heat is proposed, in which the main irreversible losses are considered. Expressions for the efficiency and Power Output of the cycle are derived. The inherent regenerative heat loss of the cycle is revealed. The influences of several important parameters, such as the capacitance of the supercapacitor, charge ratio, endpoint voltage of the charging process on the Power Output of the cycle are discussed. The Maximum Power Output and corresponding efficiency are calculated. The results show that when the charging endpoint voltage of the electrochemical thermo-capacitive regenerative cycle is 10 V, the Maximum Power Output is 31.9 W and the efficiency at the Maximum Power Output can reach 12.8%, which is 51.2% of the Carnot efficiency. The optimal values for several parameters at the Maximum Power Output are determined. The parametric optimum selection criteria of the cycle are provided. The results obtained can ensure the cycle to operate in the optimum states.

  • Maximum Power Output and parametric choice criteria of a thermophotovoltaic cell driven by automobile exhaust
    Renewable Energy, 2018
    Co-Authors: Zhimin Yang, Yanchao Zhang, Qingchun Dong, Jincan Chen
    Abstract:

    Abstract An unreported model of the cylindrical thermophotovoltaic cell (TPVC) composed of an emitter and a photovoltaic (PV) cell is proposed and used to recycle the waste heat released by the automobile exhaust pipe to generate electricity. To theoretically analyze the performance of this system, expressions of the Power Output and the conversion efficiency of the thermophotovoltaic cell driven by the automobile exhaust are derived analytically. The optimal functions of the temperature distributions of the automobile exhaust pipe and TPVC are obtained by the variational method and the modified Lagrangian formulation. The Maximum Power Output is calculated. The performance characteristics of the whole system at the Maximum Power Output are represented. The optimal regions of the voltage Output of the PV cell, the energy gap of the material in the PV cell, and the inlet heat flow of the gas pipe are determined. The effects of the size of the gas pipe on the performance of the TPVC are discussed. The theoretical efficiencies of the TPVC and thermoelectric generator driven by the automobile exhaust are compared. The advantages of the TPVC are revealed. The results obtained show that the optimally designed TPVC can significantly harvest the waste heat of the automobile exhaust.

  • Maximal continuous Power Output and parametric optimum design of an electrochemical system driven by low-grade heat
    Energy Conversion and Management, 2017
    Co-Authors: Yuan Wang, Yinghui Zhou, Wanli Peng, Jincan Chen
    Abstract:

    Abstract A new model of the electrochemical system consisting of multiple thermally regenerative electrochemical cycles (TRECs) working in different states is proposed to solve the problem of discontinuous Power Output. This system can efficiently harvest low-temperature waste heat and realize the continuous Power Output. Based on the performance of a single TREC, the Power Output and efficiency of the system are analytically derived. The effects of the electric current on the Power Output and the upper and lower boundaries of the efficiency are discussed. The general performance characteristics of the system at the Maximum Power Output are revealed. Moreover, it is expounded that when the system is operated at the state of the Maximum efficiency-Power product, the systemic performance relative to the state of the Maximum Power Output may have an obvious improvement. For example, when the Carnot efficiency of the system is smaller than 0.2, the improvement ratio of the systemic performance is larger than 16%. The results obtained here show that the system should be operated between the Maximum Power Output and the Maximum efficiency-Power product. Consequently, the optimal criteria of the parametric design are provided and the rationally operating region of the system is determined.

  • Thermoelectric performance and optimization of three-terminal quantum dot nano-devices
    Energy, 2016
    Co-Authors: Yanchao Zhang, Yuan Wang, Chuankun Huang, Jincan Chen
    Abstract:

    The thermodynamic performance and optimization of a three-terminal quantum dot nano-device consisting of two capacitively coupled quantum dots connected to electron reservoirs in the Coulomb-blockade regime are investigated. Based on the master equation, the existing model with configuration A and a previously unreported model with configuration B of the device are studied and compared systematically. The Maximum Power Output and efficiency of the two configurations under different given conditions are analyzed. The results obtained indicate that the working regions of the Output voltage and Coulomb interaction of configuration B are significantly larger than those of configuration A. Moreover, the optimum ranges of the Output voltage and Coulomb interaction of both configuration A and B are determined. A key measure of performance, i.e. the efficiency at the Maximum Power Output, is further studied. It is found that the efficiency at the Maximum Power Output is approximately equal to 0.035 for configuration A and 0.058 for configuration B. When the temperature difference between the two electron reservoirs is large enough, the Maximum Power Output and efficiency at the Maximum Power Output of configuration B are significantly larger than those of configuration A.

  • efficiencies of two level weak dissipation quantum carnot engines at the Maximum Power Output
    Journal of Applied Physics, 2013
    Co-Authors: Junyi Wang, Yuan Wang, Jincan Chen
    Abstract:

    A weak-dissipation cycle model of two-level quantum Carnot engines is proposed by adopting a generic energy spectrum and the superposition effect of quantum systems. Expressions for the Power Output and efficiency of the cycle are derived. The optimal relation between the Power Output and the efficiency is obtained and the optimally operating region of the cycle is determined. Moreover, analytical expression for the efficiency of the cycle at the Maximum Power Output is deduced and the lower and upper bounds of the efficiency at the Maximum Power Output are given. The results obtained are general and can be directly used to discuss the optimal performance characteristics of several types of two-level quantum Carnot engines.

Sanjeev Kumar Metya - One of the best experts on this subject based on the ideXlab platform.

  • Mathematical model to estimate the Maximum Power Output of a total cross tied connected PV array during partial shading condition
    Iet Renewable Power Generation, 2019
    Co-Authors: Papul Changmai, Sisir Kumar Nayak, Sanjeev Kumar Metya
    Abstract:

    Estimation of the Output Power of a solar photovoltaic (PV) system during partial shading condition (PSC) is an interest of PV installers. Owing to the inclusion of a bypass diode, the occurrence of local and global Maximum peak creates more difficulty in the calculation of Maximum Power Output from a PV array. In this study, a mathematical model is established to estimate the percentage of degradation of a square total cross tied (TCT) connected PV array at different PSCs. By employing the proposed algorithm, it will be easier to estimate the Maximum Power point of a m × n ( m = n ) TCT connected PV array during PSC without using any measuring instrument except for the measurement of irradiance and temperature. A better correlation is obtained when the Output of the proposed model is compared with MATLAB simulated Output. The Output of the proposed model is compared with the experimental Output performed on an array comprises of 3 W PV modules and the comparison shows the satisfactory result.

  • Mathematical model to estimate the Maximum Power Output of a total cross tied connected PV array during partial shading condition
    IET Renewable Power Generation, 2019
    Co-Authors: Papul Changmai, Sisir Kumar Nayak, Sanjeev Kumar Metya
    Abstract:

    Estimation of the Output Power of a solar photovoltaic (PV) system during partial shading condition (PSC) is an interest of PV installers. Owing to the inclusion of a bypass diode, the occurrence of local and global Maximum peak creates more difficulty in the calculation of Maximum Power Output from a PV array. In this study, a mathematical model is established to estimate the percentage of degradation of a square total cross tied (TCT) connected PV array at different PSCs. By employing the proposed algorithm, it will be easier to estimate the Maximum Power point of a $m \times n$m×n ($m = n$m=n) TCT connected PV array during PSC without using any measuring instrument except for the measurement of irradiance and temperature. A better correlation is obtained when the Output of the proposed model is compared with MATLAB simulated Output. The Output of the proposed model is compared with the experimental Output performed on an array comprises of 3 W PV modules and the comparison shows the satisfactory result.

Liqing Wu - One of the best experts on this subject based on the ideXlab platform.

Papul Changmai - One of the best experts on this subject based on the ideXlab platform.

  • Mathematical model to estimate the Maximum Power Output of a total cross tied connected PV array during partial shading condition
    Iet Renewable Power Generation, 2019
    Co-Authors: Papul Changmai, Sisir Kumar Nayak, Sanjeev Kumar Metya
    Abstract:

    Estimation of the Output Power of a solar photovoltaic (PV) system during partial shading condition (PSC) is an interest of PV installers. Owing to the inclusion of a bypass diode, the occurrence of local and global Maximum peak creates more difficulty in the calculation of Maximum Power Output from a PV array. In this study, a mathematical model is established to estimate the percentage of degradation of a square total cross tied (TCT) connected PV array at different PSCs. By employing the proposed algorithm, it will be easier to estimate the Maximum Power point of a m × n ( m = n ) TCT connected PV array during PSC without using any measuring instrument except for the measurement of irradiance and temperature. A better correlation is obtained when the Output of the proposed model is compared with MATLAB simulated Output. The Output of the proposed model is compared with the experimental Output performed on an array comprises of 3 W PV modules and the comparison shows the satisfactory result.

  • Mathematical model to estimate the Maximum Power Output of a total cross tied connected PV array during partial shading condition
    IET Renewable Power Generation, 2019
    Co-Authors: Papul Changmai, Sisir Kumar Nayak, Sanjeev Kumar Metya
    Abstract:

    Estimation of the Output Power of a solar photovoltaic (PV) system during partial shading condition (PSC) is an interest of PV installers. Owing to the inclusion of a bypass diode, the occurrence of local and global Maximum peak creates more difficulty in the calculation of Maximum Power Output from a PV array. In this study, a mathematical model is established to estimate the percentage of degradation of a square total cross tied (TCT) connected PV array at different PSCs. By employing the proposed algorithm, it will be easier to estimate the Maximum Power point of a $m \times n$m×n ($m = n$m=n) TCT connected PV array during PSC without using any measuring instrument except for the measurement of irradiance and temperature. A better correlation is obtained when the Output of the proposed model is compared with MATLAB simulated Output. The Output of the proposed model is compared with the experimental Output performed on an array comprises of 3 W PV modules and the comparison shows the satisfactory result.

Milan H Cobble - One of the best experts on this subject based on the ideXlab platform.

  • Calculations of Generator Performance
    CRC Handbook of Thermoelectrics, 1995
    Co-Authors: Milan H Cobble
    Abstract:

    An analysis of a thermoelectric generator is presented and expressions derived for the thermoelectric efficiency, optimum efficiency, Maximum Power Output, and Maximum Power Output per unit area. Important parameters are computed for both a single-couple thermoeletric generator (TEG) and a multicouple device (MTEG). The effect of thermoelectric contact resistance is discussed.