Study on real-gas equations of high pressure hydrogen

Chen, Honggang; Zheng, Jinyang; Xu, Ping; Li, Lei; Liu, Yanlei; Bie, Haiyan

doi:10.1016/j.ijhydene.2009.08.029

Cited by 52 publications

(13 citation statements)

References 2 publications

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“…The air pressure in the tank was set at 30 MPa to obtain a high power density and enough energy. According to the literature, 17 the gas can be approximated as an ideal gas if the pressure p \ 0.5p c or the temperature T . 5T c .…”

Section: System Simplificationmentioning

confidence: 99%

Fuzzy logic speed control for the engine of an air-powered vehicle

Shi

Cai

et al. 2016

Advances in Mechanical Engineering

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To improve the condition of air and eliminate exhaust gas pollution, this article proposes a compressed air power system. Instead of an internal combustion engine, the automobile is equipped with a compressed air engine, which transforms the energy of compressed air into mechanical motion energy. A prototype was built, and the compressed air engine was tested on an experimental platform. The output torque and energy efficiency were obtained from experimental results. When the supply pressure was set at 2 MPa and the speed was 420 r min 21 , the output torque, the output power, and the energy efficiency were 56 N m, 1.93 kW, and 25%, respectively. To improve the efficiency of the system, a fuzzy logic speed control strategy is proposed and simulated. The experimental study verified that the theoretical evaluation of the system was reasonable, and this research can be referred to as the design and control of airpowered vehicles.

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Section: System Simplificationmentioning

confidence: 99%

Fuzzy logic speed control for the engine of an air-powered vehicle

Shi

Cai

et al. 2016

Advances in Mechanical Engineering

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“…where Z E is the compressibility factor, B E is the total virial coefficient (see [29]), R is the gas constant, and M H2 is the molar mass of hydrogen. Using ε = d / r and inserting Eqn (2.3) into Eqn (2.2) give the gravimetric hydrogen storage density γ G as a function of the p E and T E for given sphere dimensions…”

Section: Hydrogen Storage Capacity Of Hgmsmentioning

confidence: 99%

A hybrid hydrolytic hydrogen storage system based on catalyst-coated hollow glass microspheres

Schmid

Bauer

Eder

et al. 2016

Int. J. Energy Res.

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Summary Hydrogen‐pressurized hollow glass microspheres (HGMs) in combination with a hydride bear the potential of storing hydrogen in feasible amounts. Therefore, the approximately 20‐µm diameter spheres are heated up and pressurized with hydrogen at a pressure of 85 MPa, so hydrogen diffuses into the spheres. After the spheres are cooled down, hydrogen can be stored at room temperature without excessive security measures. To release the stored hydrogen, heat has to be applied again to reach temperatures of about 250 °C (523.15 K). To reach this temperature, it is suggested in this work to use an exothermal chemical reaction, which produces hydrogen as a by‐product. In this case, an NaBH4–water reaction will be discussed, which has to be initialized by a catalyst deployed on the HGMs. It will be shown that hydrogen storage densities of up to 20 wt% and 50 kg/m3 can be theoretically achieved with the proposed hydrogen storage system consisting of hydrogen‐pressurized HGMs and a hydride, that is, NaBH4. Volumetric storage density and other aspects, such as water management, temperature restriction, stoichiometric restriction and hydrogen diffusion through glass, will be discussed. Due to resulting high water vapour pressures, a pressure vessel will still be needed in the concept. This paper shall give an overview of theoretically achievable storage densities with the proposed system. Experiments were carried out regarding catalytic promoted hydrolysis with HGMs, and resulting storage densities were determined. These experiments show good agreement with theory. However, they will be addressed only briefly in the outlook of the paper because a detailed discussion would go beyond the scope of this work. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Therefore, the accurate knowledge of the virial coefficients is of great significance. In order to improve the accuracy of calculation, most effort has been focused on obtaining the second [15,16] and third virial coefficients [17,18].…”

Section: Derivation and Determination Of Real Gas Equation Of State Fmentioning

confidence: 99%

Pneumatic Performance Study of a High Pressure Ejection Device Based on Real Specific Energy and Specific Enthalpy

Ren

Yang

et al. 2014

Entropy

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Abstract:In high-pressure dynamic thermodynamic processes, the pressure is much higher than the air critical pressure, and the temperature can deviate significantly from the Boyle temperature. In such situations, the thermo-physical properties and pneumatic performance can't be described accurately by the ideal gas law. This paper proposes an approach to evaluate the pneumatic performance of a high-pressure air catapult launch system, in which esidual functions are used to compensate the thermal physical property uncertainties of caused by real gas effects. Compared with the Nelson-Obert generalized compressibility charts, the precision of the improved virial equation of state is better than Soave-Redlich-Kwong (S-R-K) and Peng-Robinson (P-R) equations for high pressure air. In this paper, the improved virial equation of state is further used to establish a compressibility factor database which is applied to evaluate real gas effects. The specific residual thermodynamic energy and specific residual enthalpy of the high-pressure air are also derived using the modified corresponding state equation and improved virial equation of state which are truncated to the third virial coefficient. The pneumatic equations are established on the basis of the derived residual functions. The comparison of the numerical results shows that the real gas effects are strong, and the pneumatic performance analysis indicates that the real dynamic thermodynamic process is obviously different from the ideal one.

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Study on real-gas equations of high pressure hydrogen

Cited by 52 publications

References 2 publications

Fuzzy logic speed control for the engine of an air-powered vehicle

Fuzzy logic speed control for the engine of an air-powered vehicle

A hybrid hydrolytic hydrogen storage system based on catalyst-coated hollow glass microspheres

Pneumatic Performance Study of a High Pressure Ejection Device Based on Real Specific Energy and Specific Enthalpy

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