Design and performance analysis of a radial inflow turbogenerator with the aerostatic bearings for organic Rankine cycle system

Wu, Tan; Meng, Xiangrui; Wei, Xinli; Han, Jizhong; Ma, Xiaoxun; Han, Jiangtao; Shao, Liwei

doi:10.1016/j.enconman.2020.112910

Cited by 9 publications

(2 citation statements)

References 38 publications

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“…7,8 Another hotspot is the optimization of expanders, which also captures the attention of scholars. [9][10][11] Other researchers have aroused the widespread concern of optimizing system structure, 12,13 thermo-economic optimization, 14 etc.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the characteristics of heat exchangers based on organic Rankine cycle system under different operating conditions

Meng

Lian

et al. 2021

Int J Energy Res

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Heat exchangers are crucial equipment, and the research related to organic Rankine cycle system is also of paramount importance. Experiments were carried out in a self-built test rig with the radial inflow turbine as the expander under three operating conditions. By analyzing UA values, the heat transfer area in different stages of evaporation or condensation was roughly calculated, so as to understand the operation performance of heat exchangers and its influence on system. Experimental results show that the heat transfer area in gas-phase region accounts for a great proportion of evaporator at the beginning with the rising flow rate of R245fa, and finally insufficient heat transfer area is preferentially provided for the preheating and superheating sections. The turning point occurs when the flow rate of R245fa is 800 kg/h, where the distribution of heat transfer area is relatively balanced with optimum system performance. Excessive heat transfer oil flow rate also results in disequilibrium distribution of heat transfer area in the evaporation process. Meanwhile, the optimal flow rate of heat transfer oil is 4 m 3 /h with maximum thermal efficiencies. Besides, through the comparative analysis of the UA values, the stability of the condenser in the ORC system is better than that of the evaporator under different operating conditions. Highlights 1. The characteristics of the heat exchangers based on ORC system are investigated.2. The distribution of heat transfer area in each stage of evaporation is analyzed.3. The stability of the condenser is better than that of evaporator in experiments.4. The performance of the system is optimal under suitable operating conditions.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation on the characteristics of heat exchangers based on organic Rankine cycle system under different operating conditions

Meng

Lian

et al. 2021

Int J Energy Res

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“…Compared to a liquid lubricated bearing, it has the advantages of low friction, limited heat generation and long life, which is due to the absence of contact between moving and stationary parts [2]. Moreover, no additional lubricant or coolant is required in the system with aerostatic bearings, since the air or the working medium are used for lubrication [3]. Therefore, theoretical research on gas bearings and their application has developed rapidly [4].…”

Section: Introductionmentioning

confidence: 99%

New Start-up Method for a Closed-Cycle Compression System with Gas Bearings and Its Characteristics

Lian

Hong

et al. 2020

Chin. J. Mech. Eng.

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Gas bearings, which have the advantages of low frictional resistance and power loss, high rotational speed and high temperature operation, and long life, are more suitable than are traditional liquid lubricated bearings because of their high precision, high rotational speed, and special condition support. However, the problem of starting a closed-cycle compression system with gas bearings still needs to be solved for practical application. Thus, a new start-up method for a closed-cycle compression system with aerostatic gas bearings is proposed in this paper. Further, this paper presents a numerical simulation and experimental investigation of the method’s feasibility and characteristics during the start-up process when the gas tank’s initial pressure is fixed. The results show that the gas tank volume is approximately directly proportional to the start-up time allowable, and a gas tank volume sufficiently small, which not only ensures the feasibility of start-up, but also affects other components only slightly, can be obtained. A perfect combination of radial and axial loads also can be achieved to make the start-up time allowable as long as possible. R134a is a better choice for the working medium than is air, as the start-up time allowable is longer, which leads to a smaller gas tank. This research proposes a new start-up method for a closed-cycle compression system with aerostatic gas bearings which has sufficient load capacity to support system during the start-up method.

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Design and optimization of the radial inflow turbogenerator for organic Rankine cycle system based on the Genetic Algorithm

Wu,

Cai,

Yao

et al. 2024

Applied Thermal Engineering

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Design and performance analysis of a radial inflow turbogenerator with the aerostatic bearings for organic Rankine cycle system

Cited by 9 publications

References 38 publications

Experimental investigation on the characteristics of heat exchangers based on organic Rankine cycle system under different operating conditions

Experimental investigation on the characteristics of heat exchangers based on organic Rankine cycle system under different operating conditions

New Start-up Method for a Closed-Cycle Compression System with Gas Bearings and Its Characteristics

Design and optimization of the radial inflow turbogenerator for organic Rankine cycle system based on the Genetic Algorithm

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