Circular Economy in Practice: Building a Simple Greenhouse from Recycled Plastic
Abstract
:1. Introduction
2. Materials
3. Methods
- Step #1
- Design the geometries of rods and fasteners.
- Step #2
- Run static stress analyses.
- Step #3
- Check is the results fit the safety requirements or not. If the safety requirements are not satisfied, return to Step #1.
- Step #4
- Run dynamic force analyses.
- Step #5
- Check if the results fit safety requirements or not. If the safety requirements are not satisfied, return to Step #1.
- Step #6
- Build the simple greenhouse.
4. Results
4.1. Static Force Analysis
4.2. Dynamic Force Analysis
4.3. On-Site Construction of the Greenhouse
5. Discussion
6. Conclusions
- (1)
- Recycled composite plastic rods made by mixing discarded fishing nets and car bumpers were successfully used in the design and construction of a simple greenhouse. The safety of the design was ensured through static and dynamic force analysis, and it was verified by on-site construction.
- (2)
- The static force analysis (axial tensile force, x-axis bending moment, and y-axis bending moment) showed that the bolt hole of the rod would be enlarged during an encounter with force 11 strength winds, but that this deformation would not affect the overall structural safety.
- (3)
- The dynamic force analysis results show that no resonance will occur at the joint under typical earthquake and exhaust fan frequencies and, thus, that the greenhouse design is safe.
- (4)
- Finally, the design was further verified by construction of a greenhouse covering an area of 60 m2.
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Characteristic | Value |
---|---|
melting point (°C) | 230 |
glass transition temperature (°C) | 72 |
heat resistance temperature (°C) | 210 |
maximum tensile strength (MPa) | 71.7847 |
elongation (%) | 6.5 |
maximum bending strength (MPa) | 122.5831 |
flexural modulus of elasticity (GPa) | 4.4130 |
hardness (Shore D) ASTM D2240 | 80 |
density (g/cm3) | 1.43 |
Fastener | Axial Tension (N) | X-Axis Bending Moment (N mm) | Y-Axis Bending Moment (N mm) |
---|---|---|---|
A | 2169.23 | 249,932.28 | 208,126.53 |
B | 1737.10 | 249,932.30 | 208,126.50 |
C | 1941.72 | 59,085.10 | 226,268.80 |
D | 2004.48 | 164,339.80 | 649,484.60 |
E | 2144.71 | 399,503.31 | 646,375.91 |
F | 2004.48 | 201,193.23 | 190,347.08 |
G1 | 2156.48 | 189,895.97 | 189,895.97 |
G2 | 2156.48 | 189,895.97 | 189,895.97 |
H | 1796.58 | 201,193.23 | 91,417.59 |
Axial Tension Force | X-Axis Bending Force | Y-Axis Bending Force | ||||
---|---|---|---|---|---|---|
Fastener | von Mises (MPa) | Safety Factor (μL) | von Mises (MPa) | Safety Factor (μL) | von Mises (MPa) | Safety Factor (μL) |
A | 16.33 | 8.15 | 117.5 | 1.93 | 139.6 | 1.37 |
B | 316.7 | 1.2 | 526.3 | 0.71 | 261.4 | 1.25 |
C | 56.23 | 3.65 | 51.58 | 4.43 | 198.5 | 1.84 |
D | 37.9 | 5.99 | 99.93 | 1.91 | 336.5 | 0.53 |
E | 139.3 | 2.06 | 274.2 | 0.93 | 540.3 | 0.47 |
F | 15.27 | 9.16 | 98.82 | 1.57 | 319.5 | 0.94 |
G1 | 14.59 | 10.03 | 158.4 | 1.84 | 83.57 | 1.71 |
G2 | 23.47 | 6.79 | 182.4 | 1.82 | 78.89 | 1.86 |
H | 12.92 | 11.65 | 97.4 | 1.74 | 68.35 | 4.14 |
Fastener | |||||||||
---|---|---|---|---|---|---|---|---|---|
Frequency (Hz) | A | B | C | D | E | F | G1 | G2 | H |
F1 | 219.57 | 187 | 217.28 | 179.9 | 194.82 | 215.73 | 214.64 | 194.92 | 202.84 |
F2 | 220.07 | 199.01 | 220.45 | 181.1 | 196.17 | 264.2 | 216.31 | 209.31 | 204.81 |
F3 | 224.59 | 224.76 | 234.38 | 212.19 | 223.53 | 264.52 | 253.71 | 222.44 | 222.58 |
F4 | 278.8 | 586.76 | 277.51 | 220.23 | 249.13 | 683.12 | 257.22 | 257.38 | 249.18 |
F5 | 280.34 | 598.12 | 280.45 | 236.46 | 261.19 | 686.03 | 272.97 | 267.17 | 264.43 |
F6 | 1037.22 | 638.96 | 592.46 | 606.93 | 655.45 | 689.34 | 692.2 | 604.44 | 659.33 |
F7 | 1109.22 | 942.11 | 627.35 | 649.66 | 671.46 | 1072.69 | 705.02 | 627.11 | 662.78 |
F8 | 1125.7 | 970.63 | 636.89 | 678.37 | 716.4 | 1243.86 | 705.42 | 699.79 | 679.57 |
F9 | 1153.65 | 1076.54 | 966.17 | 839.54 | 923.45 | 1274.13 | 1056.12 | 993.8 | 1005.71 |
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Yang, C.-J.; Lin, M.-J.; Chen, P.-T.; Chiu, H.-L. Circular Economy in Practice: Building a Simple Greenhouse from Recycled Plastic. Machines 2022, 10, 1207. https://doi.org/10.3390/machines10121207
Yang C-J, Lin M-J, Chen P-T, Chiu H-L. Circular Economy in Practice: Building a Simple Greenhouse from Recycled Plastic. Machines. 2022; 10(12):1207. https://doi.org/10.3390/machines10121207
Chicago/Turabian StyleYang, Cheng-Jung, Mei-Jyun Lin, Po-Tuan Chen, and Hsin-Lin Chiu. 2022. "Circular Economy in Practice: Building a Simple Greenhouse from Recycled Plastic" Machines 10, no. 12: 1207. https://doi.org/10.3390/machines10121207