Which of scroll air compressor and screw air compressor saves electricity

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

3. selection decision model

1. 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.
2. 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

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.