A Novel Isothermal Compression Method for Energy Conservation in Fluid Power Systems
<p>Electricity consumption statistics of compressors in China.</p> "> Figure 2
<p>Composition and energy distribution of a pneumatic system.</p> "> Figure 3
<p><span class="html-italic">p–V</span> diagram for gas compression.</p> "> Figure 4
<p>Principle of isothermal piston.</p> "> Figure 5
<p>Porous medium.</p> "> Figure 6
<p>The scheme of the compression system. (<b>a</b>) Resistance measurement (<b>b</b>) configuration of the isothermal piston.</p> "> Figure 7
<p>Dissolution rate of the isothermal experiment.</p> "> Figure 8
<p>Pressure drop by leakage in the adiabatic experiment.</p> "> Figure 9
<p>Leakage rate of the isothermal experiment.</p> "> Figure 10
<p>Piston velocity.</p> "> Figure 11
<p>Resistance between porous media and water.</p> "> Figure 12
<p>Temperature of the air as a function of piston travel.</p> "> Figure 13
<p>Air pressure in the chamber during the compression process.</p> "> Figure 14
<p>Compression work done on the air as a function of piston travel. This plot includes the work to overcome the frictional forces.</p> ">
Abstract
:1. Introduction
2. Concept of the Isothermal Piston
3. Mathematical Model and Experimental Setup
4. Results and Discussion
4.1. Compensation for Dissolution
4.2. Compensation for Leakage
4.3. Friction Analysis
4.4. Validation of Effectiveness
4.5. Discussion
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
Abbreviations
c | molarity (mol/L) | Greek symbols | |
Cc | Inertia coefficient of porous medium | ε | Porosity (%) |
d | Hydraulic radius of a porous medium (m) | ρ | Density of fluids (kg/m3) |
H | Enthalpy (J) | μ | Dynamic viscosity (Pa∙s) |
Hcp | Henry’s Law constant (mol/L∙atm) | Subscripts & Superscripts | |
K | Permeability of porous medium (%) | 0 | Initial condition |
m | Mass (kg) | adi | Adiabatic condition |
p | Pressure (Pa) | dis | Dissolution |
R | Gas constant (J/kg·K−1) | exp | Experiment |
T | Temperature (K) | f | friction |
u | Relative velocity between a fluid and a porous medium (m/s) | iso | Isothermal condition |
U | Internal energy (J) | lea | Leakage |
V | Volume (m3) | sim | Simulation |
W | Work (J) |
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Parameter Name | Symbol | Parameter |
---|---|---|
Porosity of the foam copper | ε/% | 0.92 |
Hole density | ppi | 40 |
Specific surface area of the foam copper | Sv/m−1 | 2980 |
Volume of the foam copper | Vpor/cm3 | 30 |
Equipment | Company/Serial No. | Parameter |
---|---|---|
Compression chamber | - | Φ100 mm, L200 mm |
Drive cylinder | SMC/CDQ2B100-100D | Φ100 mm, L120 mm |
Pressure regulator | SMC/AF30-03 | 0.1–1.0 MPa |
Solenoid valve | SMC/SY5140-5L-02 <0.15–0.7 MPa> | Frequency < 20 Hz |
Displacement sensor | SiFang | Resolution: 40 μm/pulse Range: 0–1 m |
Pressure sensor | KELLER/PR-25 | Range: −1–10 bar Accuracy: ±0.2% FS Frequency < 5 kHz |
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Ren, T.; Xu, W.; Jia, G.-W.; Cai, M. A Novel Isothermal Compression Method for Energy Conservation in Fluid Power Systems. Entropy 2020, 22, 1015. https://doi.org/10.3390/e22091015
Ren T, Xu W, Jia G-W, Cai M. A Novel Isothermal Compression Method for Energy Conservation in Fluid Power Systems. Entropy. 2020; 22(9):1015. https://doi.org/10.3390/e22091015
Chicago/Turabian StyleRen, Teng, Weiqing Xu, Guan-Wei Jia, and Maolin Cai. 2020. "A Novel Isothermal Compression Method for Energy Conservation in Fluid Power Systems" Entropy 22, no. 9: 1015. https://doi.org/10.3390/e22091015