Practical Guide to Energy Management for Semiconductor Factory

Semiconductor manufacturing is a well-known "energy-consuming beast". For an advanced fab, the power cost of an advanced wafer factory may account for more than 30% of the total operating cost. Against the background of the "double carbon" goal, semiconductor companies located in areas with tight power supply such as South China and East China are facing huge pressure on energy conservation, consumption reduction and cost control. An intelligent and precise energy management system (EMS) is no longer a icing on the cake, but a core facility related to corporate competitiveness and sustainable development. However, the energy system of a semiconductor factory is extremely complex, involving many expensive and critical subsystems such as electricity, ultrapure water, special gas, vacuum, and cooling water. The construction of an energy management system is full of challenges. Based on many successful practices in the semiconductor and electronics industries, Shanghai Ruikongyuan Intelligent Technology Co., Ltd. provides you with practical guidelines for energy management system construction from recognition to implementation.

** Part 1: Recognize the unique complexity and core goals of semiconductor factory energy management **
Different from ordinary factories, the energy management of semiconductor factories must resolve three major contradictions:
1. ** Ultra-high energy consumption and extreme stability requirements **: Core equipment such as lithography machines and etching machines have almost strict requirements on power quality (voltage, frequency) and cooling water temperature and flow stability. Energy-saving measures must not be at the expense of stability.
2. ** Strong coupling and independent management of multiple energy subsystems **: Electricity, ultrapure water, process cooling water (PCW), exhaust gas treatment and other systems are interconnected, but traditionally they are often managed by different departments or suppliers, and data silos are serious., it is difficult to achieve global optimization.
3. ** The gap between massive data and actionable insights **: Factory Affairs Monitoring Systems (FMS) may collect tens of thousands of data points, but how to analyze effective energy-saving opportunities and implement them automatically is a huge challenge.
Therefore, the core goal of the semiconductor factory EMS should be to achieve transparency, refinement of management and intelligent control of energy consumption while ensuring absolute safety and stability of production, and ultimately reduce energy consumption per unit of product (UPW).

** Part 2: Key steps and common "deep pits" in energy management system construction ***
** Step 1: Top-level planning and demand focus (avoid "big and empty")**
Myth: We pursued a "big and comprehensive" platform from the beginning, hoping to solve all problems at once, resulting in long project cycles, large investment, and slow results.
Practical guide: Adopt the strategy of "overall planning, step-by-step implementation". First, a comprehensive energy audit is conducted to identify the links with the highest proportion of energy consumption and the greatest energy conservation potential (usually HVAC systems, PCW systems, air compressor groups, etc.). The first phase of the project focuses on these key links and clarifies specific and quantifiable KPIs, such as "improving the annual average refrigeration COP by X% by optimizing group control of chillers." In the early stages of the project, Ruikongyuan will use professional diagnostic tools and industry databases to help customers accurately locate the "energy black hole" and ensure that the return on investment of the project is clearly visible.

** Step 2: System architecture design and data integration (overcoming "information islands")**
Myth: Think that deploying a new EMS software can solve the problem, and ignore the problem of data docking with existing DCS, PLC, FMS, and various smart meters, water meters, and gas meters.
Practical guide: System architecture design is the key to success or failure. An excellent semiconductor factory EMS should have the following characteristics:
- ** Open data platform **: It must support multiple industrial protocols such as OPC UA, Modbus TCP/IP, and BACnet/IP, and can seamlessly integrate data from control systems of different brands such as Siemens, Rockwell, and Honeywell. Relying on its in-depth cooperation experience with mainstream automation brands, Ruikongyuan has unique advantages in complex system integration.
- ** Layered distributed architecture **: Deploy intelligent gateways or edge controllers at the edge layer (workshop, power station building) for local rapid control and data preprocessing; deploy central energy management servers at the factory level for big data analysis, report generation and advanced optimization strategy calculation. This architecture not only ensures real-time performance, but also reduces the load on the central system.
- ** High reliability and network security **: Adopt industrial-grade hardware and redundant network design to ensure stable operation of the system 7 x 24 hours a day. At the same time, it must comply with industrial network security standards such as ISO92.0 or IEC 62443.

** Step 3: Deployment of advanced application functions (achieve "intelligence")**
Myth: The system only implements data monitoring and historical recording, becoming an "advanced Kanban" and does not produce actual energy-saving benefits.
Practical guide: The real value lies in advanced applications. Practical intelligent functions should be deployed based on the needs focused on in the first phase:
1. ** Equipment-level energy efficiency monitoring and warning **: Calculate the instantaneous efficiency of key energy-using equipment (such as chillers, air compressors, and water pumps) in real time, and immediately alarm once it deviates from the efficient range, changing "scheduled maintenance" to "predictive maintenance".
2. ** System-level optimization control **: This is the "main battlefield" for energy conservation. For example:
- ** Chiller group control optimization **: dynamically adjust the combination and load of operating units based on cooling load demand, outdoor temperature and humidity, and electricity price periods to achieve the highest COP of the entire refrigeration station system. In a semiconductor factory project along the coast of East China, Ruikongyuan applied this strategy to reduce annual cooling power consumption by 12%.
- ** Intelligent joint control of air compressor group **: Automatic start, stop and adjust multiple air compressors according to the main pipe pressure to avoid "big carriages" and frequent loading and unloading.
- ** Demand-side response (DR) preparation **: When the power supply is tight, the system can automatically identify and safely reduce non-critical loads, helping customers participate in the grid demand response and gain additional benefits.
3. ** Energy cost allocation and benchmarking **: The total energy consumption is apportioned according to product lines, workshops and even machines to provide an accurate basis for internal cost accounting and energy conservation assessment. And benchmark against industry benchmarks to find gaps.

** Step 4: Continuous operation and maintenance and optimization iteration (ensure "long-term effectiveness")**
Myth: Project acceptance ends immediately, lack of continuous data analysis and strategy optimization, and the system effect declines over time.
Practical guide: Energy management is a process of continuous improvement. Suppliers should provide long-term technical support services:
- ** Regular energy efficiency reports and analysis **: Ruikongyuan can provide monthly/quarterly energy efficiency analysis reports, which not only show the amount of energy conservation, but also provide in-depth analysis of the reasons for energy conservation/energy consumption and propose improvement suggestions.
- ** Algorithm model optimization **: As production conditions change and equipment ages, the original optimization model parameters may need to be adjusted. Ruikongyuan's technical team can conduct model retraining and parameter optimization remotely or on-site.
- ** System expansion and upgrade **: When enterprises expand production capacity or transform process, the EMS system should be able to easily expand the monitoring scope and integrate new energy systems.

** Ruikongyuan's differentiated value and regional services **
The semiconductor industry is highly concentrated in South China, Yangtze River Delta and other regions, which are also the core of Ruikongyuan's domestic market development. Our differentiated advantages are:
1. ** Energy management experts who understand process **: We not only understand automation, but also have a deeper understanding of the dependence of special process systems such as special gas and ultrapure water for semiconductor manufacturing on energy, and can design energy-saving strategies that are more suitable for process requirements.
2. ** Full-process technology implementation capabilities **: From energy audit, plan design, system integration, advanced application development to long-term operation and maintenance, we provide one-stop services to ensure that solutions are perfectly implemented from drawings to actual energy-saving effects.
3. ** Rapid response of localization **: In semiconductor factories, the loss of production is huge. Our service network in key industrial areas ensures quick arrival when needed and ensures continuous production.

** Conclusion **
Building an energy management system for a semiconductor factory is a systematic project that involves multiple disciplines and requires deep industry knowledge. When selecting partners, you should go beyond the simple perspective of software and hardware suppliers and look for strategic partners like Shanghai Ruikongyuan who have process understanding, complex system integration capabilities and willingness to continue service. Through scientific planning, robust architecture, intelligent application and continuous optimization, the energy management system can truly become the smart brain for your semiconductor factory to reduce costs, increase efficiency, and green manufacturing.