Optimization of a closed Brayton cycle for space power systems

Liu, Haiqing; Chi, Zhongran; Zang, Shusheng

doi:10.1016/j.applthermaleng.2020.115611

Cited by 33 publications

(13 citation statements)

References 14 publications

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“…The radiator panel radiates the heat from the cold HEX to the space environment. According to Reference [44], the heat flux rate of the radiation HT is…”

Section: Cycle Model and Performance Indicatorsmentioning

confidence: 99%

“…For example, due to the relatively low temperature of the space environment, the waste heat generated by a low-temperature heat sink (LTHS) must be dissipated to the environment through a special radiator panel to increase the POW of the plant. Many scholars have studied space power plants with classical thermodynamics [40][41][42][43][44]. The mass and size of the heat exchangers (HEXs) of space power plants have major impacts on the feasibility of the devices.…”

Section: Introductionmentioning

confidence: 99%

“…Toro and Lior [43] analyzed the effects of the main operating parameters of the CBC for space power plants on the relationships among the POW and TEF and the radiator panel area ratio under different working fluid (WF) space conditions. Liu et al [44] optimized the CBC for space power plants and found that the overall mass of the power plant could be reduced by optimizing the core parameters of the plant components.…”

Section: Introductionmentioning

confidence: 99%

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Optimal Heat Exchanger Area Distribution and Low-Temperature Heat Sink Temperature for Power Optimization of an Endoreversible Space Carnot Cycle

Wang

Chen

et al. 2021

Entropy

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Using finite-time thermodynamics, a model of an endoreversible Carnot cycle for a space power plant is established in this paper. The expressions of the cycle power output and thermal efficiency are derived. Using numerical calculations and taking the cycle power output as the optimization objective, the surface area distributions of three heat exchangers are optimized, and the maximum power output is obtained when the total heat transfer area of the three heat exchangers of the whole plant is fixed. Furthermore, the double-maximum power output is obtained by optimizing the temperature of a low-temperature heat sink. Finally, the influences of fixed plant parameters on the maximum power output performance are analyzed. The results show that there is an optimal temperature of the low-temperature heat sink and a couple of optimal area distributions that allow one to obtain the double-maximum power output. The results obtained have some guidelines for the design and optimization of actual space power plants.

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“…The radiator panel radiates the heat from the cold HEX to the space environment. According to Reference [44], the heat flux rate of the radiation HT is…”

Section: Cycle Model and Performance Indicatorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimal Heat Exchanger Area Distribution and Low-Temperature Heat Sink Temperature for Power Optimization of an Endoreversible Space Carnot Cycle

Wang

Chen

et al. 2021

Entropy

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“…They pointed out that the pressure drop had a significant impact on the design of the recuperator and the thermoeconomic of the system. Dedicated to the study of the Brayton cycle for space power systems, researchers, such as Ribeiro et al, 32 Sondelski and Nellis, 33 and Liu et al, 34 used different methods to characterize the size of a heat exchanger to optimize the system mass.…”

Section: Introductionmentioning

confidence: 99%

Multi‐objective optimization of thermoeconomic and component size of supercritical carbon dioxide recompression cycle based on small‐scale lead‐cooled fast reactor

Wang

et al. 2022

Intl J of Energy Research

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Summary When the supercritical CO2 power cycle is employed in confined spaces, such as nuclear‐powered ships and spacecraft, its size should be given priority. To estimate the component size, the one‐dimensional heat exchanger model developed in this study is used in a recompression supercritical CO2 cycle integrated on a small‐scale lead‐cooled fast reactor. A parameter analysis was performed to study the influence of several key parameters on the levelized cost of electricity, thermal efficiency, and system size. Moreover, four types of multi‐objective optimizations were conducted to provide optimization schemes for different scenarios. Results indicated that the increased turbine inlet temperature improved the thermoeconomic but augmented the system volume. The size of the low‐temperature recuperator was observably enlarged near the optimal flow split ratio, thereby increasing the system volume. Pareto optimal solution of bi‐objective optimization based on the levelized cost of electricity and system size reached the lowest system volume of 3.71 m3. Additionally, the best trade‐off result of three‐objective optimization was a thermal efficiency of 42.14%, a levelized cost of electricity of 56.30 $∙MWh−1, and a system volume of 4.43 m3. Meanwhile, maximal and minimal pressure drops of CO2 appeared in the cooler and intermediate heat exchanger, respectively.

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“…In order to increase the efficiency, closed cycle power plants are modified [28]. The parameters of the working medium are optimized [29] and regenerators [30] and intercoolers [31] can sometimes be applied.…”

Section: Introductionmentioning

confidence: 99%

Design Analysis of Micro Gas Turbines in Closed Cycles

Kosowski

Piwowarski

2020

Energies

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The problems faced by designers of micro-turbines are connected with a very small volume flow rate of working media which leads to small blade heights and a high rotor speed. In the case of gas turbines this limitation can be overcome by the application of a closed cycle with very low pressure at the compressor inlet (lower than atmospheric pressure). In this way we may apply a micro gas turbine unit of accepted efficiency to work in a similar range of temperatures and the same pressure ratios, but in the range of smaller pressure values and smaller mass flow rate. Thus, we can obtain a gas turbine of a very small output but of the efficiency typical of gas turbines with a much higher power. In this paper, the results of the thermodynamic calculations of the turbine cycles are discussed and the designed gas turbine flow parts are presented. Suggestions of the design solutions of micro gas turbines for different values of power output are proposed. This new approach to gas turbine arrangement makes it possible to build a gas turbine unit of a very small output and a high efficiency. The calculations of cycle and gas turbine design were performed for different cycle parameters and different working media (air, nitrogen, hydrogen, helium, xenon and carbon dioxide).

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Optimization of a closed Brayton cycle for space power systems

Cited by 33 publications

References 14 publications

Optimal Heat Exchanger Area Distribution and Low-Temperature Heat Sink Temperature for Power Optimization of an Endoreversible Space Carnot Cycle

Optimal Heat Exchanger Area Distribution and Low-Temperature Heat Sink Temperature for Power Optimization of an Endoreversible Space Carnot Cycle

Multi‐objective optimization of thermoeconomic and component size of supercritical carbon dioxide recompression cycle based on small‐scale lead‐cooled fast reactor

Design Analysis of Micro Gas Turbines in Closed Cycles

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