Volume 14, Issue 15 (2015)                   Modares Mechanical Engineering 2015, 14(15): 103-110 | Back to browse issues page

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Maboudi M, Zia Bashrhagh M. Applicability of fundamental equations of state in Simulation of Cryogenic Systems; Case Study: Reverse Brayton cryocooler for HTS cable. Modares Mechanical Engineering. 2015; 14 (15) :103-110
URL: http://mme.modares.ac.ir/article-15-3951-en.html
1- MSc. student/K.N. Toosi University of Technology
2- Associate Professor
Abstract:   (3306 Views)
Abstract The lack of an accurate equation of state for predicting the thermodynamic properties of materials in a wide range of temperature and pressure caused the researchers study on new equations. . In this investigation, a reverse Brayton cryocooler was simulated as a system that prepares the sub-cooled liquid nitrogen supplying the operation condition for high temperature superconductor cables. A computational code was developed for predicting thermodynamic properties of Helium and Neon using fundamental equation of state. Comparing the results with experimental data validate the accuracy of these equations in predicting the thermodynamic properties. Then, using the developed computational code, a reverse Brayton cycle with 10 kW cooling capacity, was designed and simulated and the effect of various parameters on its performance was evaluated. Performance characteristic curves were plotted to illustrate the sensitivity analysis under different operation conditions, and the influence of various parameters such as compression ratio in compressor, maximum pressure, working fluid, efficiency of the heat recovery exchanger and efficiency of expander on the performance of the cycle was addressed. The results showed that the use of neon as a refrigerant gives a better performance than helium. Efficiency of heat recovery exchanger has a significant effect on the performance of cycle, so that 3 percent increase of this parameter increases 11 percent figure of merit (FOM) of the cycle.
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Article Type: Research Article | Subject: Thermodynamics|Micro & Nano Systems|Environment
Received: 2014/08/3 | Accepted: 2014/09/7 | Published: 2014/10/20

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