Energy consumption and energy saving in purification workshop/dust-free workshop

Main energy consumption of purification workshop/dust-free workshop:
     To maintain the temperature and relative humidity required in the dust-free workshop, necessary heat and moisture treatment (cooling, dehumidification, heating, humidification) must be performed on the air supply in the dust-free workshop, which requires cooling and heating to the air-conditioning purification system. , supplying steam consumes a lot of energy.
     To ensure the cleanliness, temperature, humidity, and other parameters of the dust-free workshop, a large amount of air must be sent into the dust-free workshop, and power equipment such as fans for air supply and water pumps for water supply also consume considerable energy.
    According to the energy consumption of cooling, heating, and steam supply as mentioned above, as well as the electricity consumption of air supply and water supply equipment, the higher the cleanliness level, the greater the energy consumption.
    The main load in the cooling load of the dust-free workshop is the fresh air cooling load, the cooling load that eliminates the heat generated by process equipment and process, and the cooling load that offsets the heat generated by fans and water pumps. These three loads account for more than 90% of the total cooling load. ; However, the three cooling loads of the building envelope, lighting, and workers account for less than 10% of the total cooling load.
Reasons for high energy consumption in purification workshops/dust-free workshops:
     Large purification air supply volume. The air supply volume of dust-free workshops with different purification levels is 1.5 to 55 times that of a comfortable air conditioner of the same area, and the supply air pressure is also 2 or 3 times, so the temperature rise of the air blower consumes a lot of cooling capacity. big.
     The fresh air volume of the air-conditioning purification system of the dust-free workshop is large. Generally, the fresh air volume is equal to the sum of the exhaust air volume and the positive pressure air leakage volume. Therefore, the production process has a large exhaust air volume, so the fresh air volume is large. Therefore, the heat and moisture treatment of fresh air consumes a lot of energy.
    The process equipment and processes in the dust-free workshop generate a lot of heat and operate continuously in two or three shifts. Therefore, the energy consumption is also large.
    The temperature, humidity, and accuracy of the production process in the dust-free workshop have very high and strict requirements. It is also the reason for high energy consumption.
What are the energy-saving techniques in a purification workshop/dust-free workshop:
    There are numerous areas where energy can be saved in a clean way, such as heating, ventilation, air conditioning (HVAC), process cooling, compressed air, and other facilities.
The following introduces the environmental protection and energy-saving aspects of large clean rooms:
    At the beginning of the design and construction of clean rooms, it was largely because shortcuts were taken when designing and building factories, and the initial investment was compressed as much as possible, regardless of the later operating costs. Efficient design and high-efficiency equipment require significant upfront investment. The so-called shortcuts and cost-cutting of "saving small things and wasting big things" will cause the factory's operating performance to decrease and energy consumption to increase.
    Renovations of established factories often spiral into pointless economic vortexes. The payback for an upgrade is usually much higher than purchasing new equipment outright. The investment payback period for most factory equipment renovations does not exceed two years - that is to say, the investment recovery rate is usually at least 50%, compared with investing in new fixed assets, it is only 10% to 15% (that is, the investment payback period takes seven years). These conditions reduce the competitiveness of enterprises and the interest of investing shareholders. In today's highly developed industry, clean room operation needs reform as much as product design.
    There are many examples of efficient use of energy. Uncovering wasted energy increases profits more than selling products because the savings are immediately reflected in the bottom line. Although energy costs account for less than 2% of the cost of chip products, electricity is the largest operating expense for chip manufacturers. Each factory consumes millions of dollars in electricity every year. When building a new factory, energy-saving measures can save capital and construction time. Although preliminary design quotes are expensive, the possibility of economical renovations remains. The investment recovery period for equipment refurbishment does not exceed two years. Generally speaking, the investment recovery rate is relatively high to some extent.
     Strictly control the design parameters (cleanliness, temperature, and humidity) and the area of the dust-free workshop, especially the area of high-level one-way flow dust-free workshops such as level 10 and level 100. Because the higher the cleanliness level, the higher the temperature and humidity accuracy requirements, and the greater the energy consumption per unit area. Therefore, seek truth from facts do as high as you should, and do not raise requirements unprincipled. Do not leave too much room for the area of the dust-free workshop. Especially for high-level dust-free workshop areas, try to use mixed flow to replace high-level dust-free workshops with low-level ones. Try to reduce the area of level 10 and level 100 one-way dust-free workshops.
     Strictly control the purification air supply volume in the dust-free workshop, and do not leave too large a safety factor. Control and supervise construction quality, reduce air leakage in clean rooms and ducts, strengthen insulation to reduce cold losses, improve equipment efficiency, and make full use of frequency conversion measures to save energy.
    Strictly control the amount of fresh air. Try to reduce the exhaust air volume as much as possible, take measures to improve the exhaust effect, and reduce the exhaust air volume to reduce the energy consumption of fresh air conditioning.
     Strengthen management. Reduce running, popping, dripping, and leaking. Make full use of heat recovery and natural energy as pre-cooling and pre-heating of the air conditioning system.