怎么洗保暖內(nèi)衣(參考版)
2025-01-03 04:45本頁面
【正文】 UNEP 2023 ? 48 169。 UNEP 2023 Energy Efficiency Opportunities ? Variable speed drives (VSDs) ? Also called inverters ? Several kW to 750 kW ? Change speed of induction motors ? Can be installed in existing system ? Reduce electricity by 50% in fans and pumps ? Convert 50Hz ining power to variable frequency and voltage: change speed ? Three types 8. Speed Control of Induction Motor 46 169。 UNEP 2023 Energy Efficiency Opportunities Checklist to maintain motor efficiency ? Inspect motors regularly for wear, dirt/dust ? Checking motor loads for over/under loading ? Lubricate appropriately ? Check alignment of motor and equipment ? Ensure supply wiring and terminal box and properly sized and installed ? Provide adequate ventilation 7. Maintenance 44 169。 UNEP 2023 Energy Efficiency Opportunities ? Rewinding: sometimes 50% of motors ? Can reduce motor efficiency ? Maintain efficiency after rewinding by ? Using qualified/certified firm ? Maintain original motor design ? Replace 40HP, 15 year old motors instead of rewinding ? Buy new motor if costs are less than 5065% of rewinding costs 5. Rewinding 42 169。 UNEP 2023 Energy Efficiency Opportunities Motor performance affected by ? Poor power quality: too high fluctuations in voltage and frequency ? Voltage unbalance: unequal voltages to three phases of motor 4. Improve Power Quality Example 1 Example 2 Example 3 Voltage unbalance (%) Unbalance in current (%) Temperature increase (oC) 0 30 40 40 169。 UNEP 2023 Energy Efficiency Opportunities ? Replace with smaller motor ? If motor operates at 50% ? Not if motor operates at 6070% ? Operate in star mode ? If motors consistently operate at 40% ? Inexpensive and effective ? Motor electrically downsized by wire reconfiguration ? Motor speed and voltage reduction but unchanged performance 2. Reduce Underloading 38 169。 UNEP 2023 Power Loss Area Efficiency Improvement 1. Fixed loss (iron) Use of thinner gauge, lower loss core steel reduces eddy current losses. Longer core adds more steel to the design, which reduces losses due to lower operating flux densities. 2. Stator I2R Use of more copper larger conductors increases cross sectional area of stator windings. This lower resistance (R) of the windings reduces losses due to current flow (I) 3 Rotor I2R Use of larger rotor conductor bars increases size of cross section, lowering conductor resistance (R) losses due to current flow (I) 4 Friction Winding Use of low loss fan design reduces losses due to air movement 5. Stray Load Loss Use of optimized design strict quality control procedures minimizes stray load losses (BEE India, 2023) Use Energy Efficient Motors Energy Efficiency Opportunities 36 169。 UNEP 2023 1. Use energy efficient motors 2. Reduce underloading (and avoid oversized motors) 3. Size to variable load 4. Improve power quality 5. Rewinding 6. Power factor correction by capacitors 7. Improve maintenance 8. Speed control of induction motor Energy Efficiency Opportunities 34 169。 UNEP
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