The power saving of scroll air compressor and screw air compressor needs to be combined load rate, uptime, maintenance cost comprehensive judgment. The following is a detailed comparative analysis:
principle and Efficiency Characteristics of 1. Technology
1. Scroll air compressor
- principle: Through the meshing movement of the two scroll plates, the continuous compression of gas is realized without reciprocating parts.
- Advantage:
- low load efficient: The volumetric efficiency is as high as 98%, and the energy efficiency is still better than that of the screw machine at 25% load.
- Low noise: The operating noise is 20% lower than that of the screw machine, suitable for hospitals, laboratories and other scenes.
- Simple maintenance: Oil-free models are lubrication-free, reducing maintenance costs by 50%.
- Disadvantages:
- high load low energy efficiency: Energy consumption at full load is 25% higher than that of screw machines.
- high machining precision: The damage of the scroll requires professional maintenance, which is costly.
2. Screw air compressor
- principle: Realize gas compression through the engagement of yin and yang rotors, with strong adaptability.
- Advantage:
- high load energy saving: Energy consumption at full load is as low as 0.12 kWh/m & sup3;(8 bar pressure).
- High stability: Support wide temperature range operation (-20 ℃ ~ 45 ℃), low failure rate.
- Disadvantages:
- low load poor energy efficiency: When the load is less than 50%, the leakage increases and the energy consumption increases.
- Complex maintenance regular oil change and rotor clearance check are required, and the 10-year maintenance cost accounts for 35%.
Comparison of 2. Measured Energy Efficiency
| Load rate | scroll machine energy consumption (kWh/m & sup3;) | screw machine energy consumption (kWh/m & sup3;) | energy efficiency advantages |
|---|
| 100 percent | 0.15 | 0.12 | screw machine |
| 75% | 0.145 | 0.13 | screw machine |
| 50% | 0.14 | 0.14 | a flat hand |
| 25% | 0.135 | 0.15 | scroll machine |
3. selection decision model
- priority scroll machine:
- scene: Large load fluctuations, annual operation <4000 hours, noise sensitivity (such as hospitals, laboratories).
- Case: When a photovoltaic enterprise has 25% load, the annual energy saving cost of the scroll machine covers the equipment difference.
- Preferred screw machine:
- scene: Stable high load, annual operation> 6000 hours, wide temperature zone adaptation (e. g. factories, mines).
- Technology upgrade: Using frequency conversion screw machine, part of the load energy saving 40%, but requires additional investment.
4. long-term cost comparison
| Model | initial investment | 10 year maintenance costs | total cost ($million) |
|---|
| scroll machine | high 15% | <20% | 85 |
| screw machine | low | 35% | 92 |
conclusion:
- low load, short running time selective scroll machine: Power saving and low maintenance cost.
- High load, long running time screw machine: High energy efficiency at full load and lower long-term total cost.
- Dynamic adjustment demand selection frequency conversion screw machine: Partial load energy saving is significant, but the initial investment needs to be balanced.
