Saving and improving electrical equipment
The energy-saving measures and strategies of the power system can start from the aspects of improving efficiency, optimizing management, intelligent application, and promoting alternative energy sources. Improving efficiency includes replacing old equipment, improving motor efficiency, improving air conditioning and lighting systems, etc.; Optimizing management includes intelligent control, power factor adjustment, transformer load balancing, etc.; Intelligent applications can use data analysis, remote monitoring and other technologies to accurately manage electricity consumption; and promoting alternative energy sources includes developmentRenewable energy, improving the power supply structure, etc.
1. Assessment of energy-saving benefits
(1) Load management
The focus of the application of power monitoring and energy-saving technology to load management is to suppress and reduce peak loads. Most of the methods for evaluating benefits use engineering methods to use actual on-site measurements as the basis for calculation. Its evaluation indicators are briefly described as follows：
- 1. Suppress and reduce peak load：Calculate the original peak load capacity value (kW) due to the implementation of power monitoring and compare it with the peak load capacity value (kW) after the implementation. The gap is the suppressed low peak load.
- 2. Load rate improvement analysis The load rate is the ratio of the average load to the peak load. The higher the load rate, the higher the equipment utilization rate. The gap between the peak load and the off-peak load is small, which can significantly reduce the cost of electricity. Compare the load rate before and after the implementation.
- 3. Load curve change analysis Since the user's electrical load system changes at any time, it is possible to draw a load curve graph, compare the changes in the load curve before and after the implementation, and evaluate its performance.
- 4. Cost-benefit analysis
(1) The benefit-to-cost ratio>1 The Benefit-to-cost ratio is the comparison of benefits and costs. The benefits are the reduced electricity bill expenditures, and the costs are the equipment, manpower, etc. costs paid for the implementation of power monitoring. The benefit-to-cost ratio must be greater than 1 to have the value of investment.
(2) After the return-to-cost ratio of the investment recovery period is greater than 1, the return-to-investment period will be calculated. The shorter the return-to-investment period, the more worthwhile it is to invest.
(2) Save electricity
The evaluation method of the efficiency of electricity conservation obtained from the implementation of the power monitoring plan can generally be divided into several systems according to the functional characteristics of the electricity used in the plant, individually evaluated according to the energy-saving work project, and then summarize the benefits of the whole plant, for example, as follows：
- 1. Power system：Power system improvement projects such as transformer load rate improvement, power factor improvement, high-efficiency transformer or motor renewal, etc.
- 2. Lighting system：Lighting system improvement projects such as lighting control, replacement of high-efficiency lamps, etc.
- 3. Air conditioning system：Air-conditioning system improvement projects such as air-conditioning host operation, operating mode improvement, air-conditioning bellows operation, operating mode improvement, temperature control operation mode improvement, ice water host efficiency improvement, etc.
- 4. Air compressor system：Air compressor system improvement items such as air compressor operation, operating mode improvement, air leakage detection improvement, air compressor efficiency improvement, etc.
- 5. Public facilities：Public facility improvement projects such as lighting control in public areas, exhaust control in parking lots, etc.