An- Najah National University Faculty of Engineering Department Of Mechanical Engineering

1. An-Najah National University • Faculty of Engineering • Department Of Mechanical Engineering Hydraulic lift with the aid of energy storage (accumulators)

2. Submitted by: • Ahmad Qasem • Nidal Khalil • Numan Shahrour • Raya Khateeb • Submitted to : • Dr. Luqman Hirzallah

3. Outline • Introduction . • Objectives . • Methodology • Practical Side • Result and analysis . • Recommendation and Conclusions

4. Introduction • Hydraulics is a branch of science and engineering concerned with the mechanical properties of liquids. • Hydraulic accumulator is used to store hydraulic energy.

5. Objectives • Design and build a hydraulic lift to raise a heavy weight like cars up to four tons by hydraulic fluid power system. • Reducing the capacity of the pump, lowering energy consumption, and producing more efficiency, therefore less expensive.

6. Methodology • The mechanism of the system starts with the hydraulic pump which pumps hydraulic fluid into the accumulator, where the gas which is contained in the bladder will be compressed. The gas volume is reduced and pressure is increased, Which accumulates energy in the accumulator to be used fully at ones, and when we open the valve to allow the bladder in accumulator push the fluid to flow in pipes pushing piston up and so to lift the weight; we predict that this amount of energy if collected will be able to raise heavier loads.

7. Practical side

8. Components • 1 – three gate valves

9. 2- Electrical motor

10. 3-Hydrolic pump(Trumpa)

11. 4- Two accumulators

12. 5- Reservoir tank • 6- Two hoses • 7- Piston

13. Final Shape

14. Result and analysis • Calculations • Column of the Piston • Material: Low carbon steel #1018 steel • We used Euler Equation to find the diameter of the arm of the piston to avoid buckling. • D = 60 mm

15. 2. Piston • Assume outer diameter of piston is 30 cm • We used pressurized vessel theory to find the thickness of the piston vessel to prevent failure. • t = 0.75 cm

16. 3. Fluid Calculation • Pump model [H H LF 1.5] • Max flow (14 gpm) • Max pressure 130 psi = 8.96 bar • SAE oil [10 W] • Depending on the flow of the pump and selected hose • V = 0.784 m/s • By Bernoulli Equation, Reynolds Number, and Moody Chart : • hp = 8.04 m

17. 4. Accumulator • Using ideal gas theory, we find the volume of the bladder before and after compression. • P1 = 101 Kpa V1 = 10 L • P2 = 896 Kpa V2 = 1.12 L • Power of the Accumulator = 4.22 KJ • Power of the Pump = 0.681 KJ

18. Recommendation and Conclusions • Increase the number of accumulators and increase their size in order to increase its effect. • Add sensors to control the charging automatically not manually, this will save time to the user.