Molecular dynamics simulation of non-azeotropic refrigerants separation in auto-cascading refrigeration [PDF]
E3S Web of Conferences, 2019 The core problem of auto-cascading refrigeration is the separation of non-azeotropic refrigerants. The separation effect of mixed refrigerant directly determines the refrigeration effect of auto-cascading refrigeration system and the value of COP. The microscopic molecular dynamics simulation method is applied to the refrigeration system, and the ...
Zheng Dayu +3 more
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Auto-tuning for cascade PID height position controller of rotorcraft [PDF]
MATEC Web of Conferences, 2019 In this article, we present a method for tuning controller parameters for cascade PID based on the step response performance characteristics of a closed loop system with application to an unmanned aerial vehicle(UAV).
Liao Guiqiu, Zhao Jiankang
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Thermodynamic analysis of auto-cascade refrigeration cycles, with and without ejector, for ultra low temperature freezing using a mixture of refrigerants R600a and R1150 [PDF]
, 2022 The temperatures required by ultra-low temperature applications, ranging from 50 ◦ C to 100 ◦ C, cannot be reached economically with single stage systems because of the limitation of the compression ratio.
Expósito Carrillo, Jose Antonio +3 more
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Experimental Study of the effects of Throttle valve on Auto-cascade Refrigeration System [PDF]
Proceedings of the 3rd International Conference on Material, Mechanical and Manufacturing Engineering, 2015 The objection of this article is to optimize auto-cascade refrigeration system. This refrigeration system use multiple mixture (R22/R23/R14) as the refrigerant, which is driven by the single-stage compressor. Throttle is an important composition of auto-cascade refrigerant system, which impact on evaporation temperature and refrigeration efficiency ...
Li Xiang +6 more
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Evaluación exergética de un ciclo de autocascada con eyector para aplicaciones de ultrabaja temperatura [PDF]
, 2022 El uso de ciclos eyectores en sistemas con R744 ha sido estudiado en los últimos años mostrando su potencial de mejora, siendo una tecnología implementada a nivel comercial.
Gutiérrez, Mario A. +2 more
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Research on control method of active disturbance quadrotor aircraf
Dianzi Jishu Yingyong, 2019 In order to solve the problem that the classical PID control algorithm can not adapt to the nonlinear controlled system,the robustness is weak and the anti-interference ability is poor,a control method was designed based on classical PID control and auto
Zhang Xiaoming, Yu Jiyan, Wang Kunkun
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Performance assessment of a novel auto-cascade heat pump using low-GWP refrigerant for obtaining high-temperature water [PDF]
International Journal of Fluid EngineeringWith the aim of developing a high-temperature heat pump with a large temperature lift, a novel auto-cascade heat pump using low global warming potential (GWP) refrigerant is proposed. Owing to the large exergy destruction between the refrigerant and heat
Gang Yan, Yuqing Yang, Yinlong Li
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Theoretical gas phase compressibility factor of mixed refrigerants in auto-cascade refrigeration system [PDF]
Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering, 2015 KEYWORD: auto -cascade; mixed refrigerants; gas phase compressibility factor; ratio of refrigerant ABSTRACT: The compressibility factor is solved using the RKS equation and the corresponding calculation program. Redlich-kwongSoave the numerical calculation method for solving the compressibility factor, R22 and CO2 is calculated and compare it with ...
Jie Li +7 more
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The Relation of Performance Parameters for a 150K Auto-Cascade Refrigeration System
Research Journal of Applied Sciences, Engineering and Technology, 2013 The performance parameters of a single compressed and four-stage segregating auto-cascade refrigeration system were developed in this study. The temperature of the cryogenic tank went down relatively slow with the evaporating temperature and the refrigerant temperature for W. When the state of system is steady, the suction pressure of the compressor is
XueLi Nie +3 more
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, 2016 The aim of this work is to study heat pump cycles, using CO 2 based mixtures as working fluids. Since adding other chemicals to CO 2 moves the critical point and generally equilibrium lines, it is expected that lower operating pressures as well as higher
Bouteiller, Paul +2 more
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