How to calculate electricity bills for variable frequency and industrial frequency air compressors

To calculate the electricity charges of variable frequency and industrial frequency air compressors, you first need to understand their power consumption, and then calculate them in combination with the local electricity price. The following is a detailed calculation method:

1. Calculation of power consumption

1. calculation of power consumption of power compressors

   • Formula: Power consumption (kWh) = working time (hours) × Rated power (kW)
   • Example: Suppose a company uses a 75kW industrial frequency compressor and works 24 hours a day.
   • Calculation: Power consumption = 24 hours × 75kW = 1800kWh

2. Calculation of power consumption of variable frequency air compressors

   • The power consumption of variable frequency air compressors is related to factors such as its operating efficiency, load rate, etc., and the operating efficiency is usually higher than that of industrial frequency air compressors.
   • Formula (approximate): Power consumption (kWh) = working time (hours) × Rated power (kW) × Operating efficiency
   • Example: Assume that the operating efficiency of the inverter air compressor is 80%, the rated power is 75kW, and it works 24 hours a day.
   • calculation: Power consumption = 24 hours × 75kW × 80% = 1440kWh

2. Electricity calculation

1. Formula: Electricity bill (yuan) = Power consumption (kWh) × Electricity price (yuan/kWh)
2. Example: Suppose the local electricity price is 0.7 yuan/kWh.
   • Electricity charge for industrial frequency air compressor: 1800kWh × 0.7 yuan/kWh = 1260 yuan/day
   • Electricity charge for variable frequency air compressor: 1440kWh × 0.7 yuan/kWh = 1008 yuan/day

III. Analysis of electricity bill savings

• Electricity charge saved every day: 1260 yuan – 1008 yuan = 252 yuan
• Electricity charge saved every year (calculated based on 365 days): 252 yuan/day × 365 days= 92,180 yuan

4. Other considerations

• Load rate: In actual use, the load rate of the air compressor may be less than 100%, which will affect the power consumption. During calculation, the load rate can be adjusted according to the actual situation.
• Equipment Efficiency: The efficiency of air compressors of different brands and models may vary. Choosing highly efficient and energy-saving equipment will help reduce electricity bills.
• Electricity price fluctuations: Electricity prices may fluctuate due to factors such as regions and seasons. The latest electricity price data should be used when calculating.

Summary

Through the above calculations, it can be seen that the frequency converter has significant advantages in electricity bill expenditure compared to the industrial frequency air compressor. In practical applications, enterprises should choose the appropriate type and model of air compressors based on their own needs and budgets to achieve the goal of saving energy and reducing consumption and improving economic benefits. At the same time, strengthening the operation management and maintenance of air compressors will also help reduce energy consumption and extend the service life of the equipment.