Thermodynamic and economic analysis and multi-objective optimization of a novel transcritical CO2 Rankine cycle with an ejector driven by low grade heat source

Xia, Jiaxi; Wang, Jiangfeng; Zhou, Kehan; Zhao, Pan; Dai, Yiping

doi:10.1016/j.energy.2018.07.161

Cited by 49 publications

(4 citation statements)

References 43 publications

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“…Owing to the low critical temperature, CO 2 cycles cover sub-critical, trans-critical and supercritical conditions, making the use of ejectors attractive to reduce the exergy losses; unfortunately, this topic is still poorly addressed in the literature. Xia et al [32] proposed an ejector-based transcritical CO 2 cycle, to exploit low-grade heat sources; a parametric analysis was performed to assess the effects of "component-scale" parameters on the "systemscale" performances. Palacz et al [33] investigated the design criteria and performances of ejector for a supercritical Brayton CO 2 cycle, as a follow-up of Padilla et al [34].…”

mentioning

confidence: 99%

Ejectors on the cutting edge: The past, the present and the perspective

Besagni

2019

Energy

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mentioning

confidence: 99%

Ejectors on the cutting edge: The past, the present and the perspective

Besagni

2019

Energy

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“…For low-temperature heat sources, the efficiency of ORC power generation systems has to be improved. 28–31 The preheater and superheater adopt plate heat exchangers, and the evaporator and condenser adopt full liquid types. The specific parameters of the evaporator are shown in Table 2.…”

Section: Orc Power Generation Systemmentioning

confidence: 99%

Experimental analysis of organic Rankine cycle power generation system with radial inflow turbine and R245fa

Lei

Liu

2014

Advances in Mechanical Engineering

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Small turbines must operate at high rotational speeds to generate adequate output power. In this study, a radial inflow turbine using R245fa as the working fluid is miniaturised and is designed to have a rotational speed of 30,000 r/min. The organic Rankine cycle system is not simplified, and a preheater and a superheater are installed. The turbine is experimentally analysed in the organic Rankine cycle system. The experimental results show that with an increase in the inlet pressure, the turbine output power and system efficiency increase; moreover, the turbine efficiency first decreases and then increases slightly after the pressure exceeds 1.5 MPa. The turbine efficiency decreases first and then increases and attains the minimum value at an inlet temperature of 100°C–105°C. When the flow rate is 0.82 m3/s, the speed reaches its maximum value of 28,000 r/min, and a maximum output power of 17.37 kW is generated. The maximum efficiency of the turbine is 0.885 and that of the system is 0.1625. The experimental data and design parameters of the turbine provide a reference for further design optimization.

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“…Although the thermodynamic performance of the CO 2 cycle is better than the ORC, it is difficult to condense CO 2 into liquid at ambient temperatures, which hinders its popularization and application. One novel t-CO 2 with an ejector can solve the condensation problem of CO 2 ; hence, the novel t-CO 2 cycle is applicable at higher ambient temperatures [21]. However, the most common and practical approach is to add a second organic compound with a higher critical temperature to CO 2 to form a mixture.…”

Section: Introductionmentioning

confidence: 99%

A Theoretical Study on the Thermal Performance of an Increasing Pressure Endothermic Cycle for Geothermal Power Generation

Yu,

Lu,

Zhang

et al. 2024

Energies

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In this study, a power cycle (IPEC), with an increasing pressure endothermic process in a downhole heat exchanger (DHE) and a CO2-based working fluid mixture, was developed for geothermal power generation. The increasing pressure endothermic process, which cannot be achieved in a conventional evaporator on the ground, was realized using the gravitational potential energy in the DHE. The parameters of the power cycle and the structural size of the DHE were optimized simultaneously. Using CO2-R32 as the working fluid of the IPEC provides the highest net power output. The net power generated with the IPEC was compared with a single-flash (SF) system, a trans-critical CO2 (t-CO2) system, and an organic Rankine cycle (ORC) under the same heat source and sink conditions. Six selection maps were generated for choosing the optimum power cycle for electricity production, in which four power generation systems (ORC, t-CO2, IPEC, and SF) were included, and two DHE diameters (0.155 m and 0.22 m) were investigated. It was found that the IPEC system had more net power output than the other three systems (ORC, t-CO2, and SF) under the conditions that the geofluid’s mass flow rate was less than 10 kg/s and its temperature was lower than 180 °C.

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Thermodynamic and economic analysis and multi-objective optimization of a novel transcritical CO2 Rankine cycle with an ejector driven by low grade heat source

Cited by 49 publications

References 43 publications

Ejectors on the cutting edge: The past, the present and the perspective

Ejectors on the cutting edge: The past, the present and the perspective

Experimental analysis of organic Rankine cycle power generation system with radial inflow turbine and R245fa

A Theoretical Study on the Thermal Performance of an Increasing Pressure Endothermic Cycle for Geothermal Power Generation

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