Introduction
Compressed air is widely used in manufacturing plants for automation, machine control, packaging, and pneumatic tools. Although it is essential for production, it is also one of the most expensive utilities if not managed properly.
One major reason for high energy consumption in compressed air systems is artificial demand. Artificial demand occurs when the system uses more compressed air than actually required because of high pressure settings, poor control, or improper system design.
Reducing artificial demand through proper air management can significantly lower electricity bills and improve overall system efficiency.
What Is Artificial Demand
Artificial demand happens when excess system pressure forces equipment to consume more compressed air than necessary.
For example, if a machine requires 6 bar pressure but the system operates at 8 bar, the higher pressure increases air flow through valves, leaks, and equipment. As a result, more compressed air is used even though production needs remain the same.
This extra consumption is not useful for production. It only increases energy costs and compressor load.
Why Artificial Demand Is a Problem
Artificial demand creates several problems in manufacturing plants:
Higher electricity consumption
Increased compressor running time
More air leakage
Greater equipment stress
Higher maintenance costs
Even a small increase in pressure can lead to a noticeable rise in energy usage. Studies show that every 1 bar increase in pressure can increase compressor energy consumption by around 6 to 8 percent.
Over time, this additional energy usage results in significant financial loss.
Main Causes of Artificial Demand
- Excessive System Pressure
Many plants operate compressors at higher pressure than required because operators believe higher pressure improves performance.
However, this practice increases air flow through gaps and control valves, creating unnecessary demand.
- Poor Pressure Control
Without proper pressure regulation and monitoring, system pressure fluctuates. When pressure drops, operators often increase compressor settings instead of fixing the root cause.
This cycle increases artificial demand and energy waste.
- Leaks in the System
Air leaks become worse at higher pressure. When pressure increases, leakage volume increases as well.
Instead of solving leak problems, some facilities compensate by raising pressure, which further increases waste.
- Improper Equipment Settings
Some pneumatic equipment and tools are not adjusted to operate at optimal pressure. Running them at higher pressure than required increases air consumption unnecessarily.
- Incorrect System Design
Undersized pipes, poor layout, and weak storage capacity can create pressure instability. To maintain stability, operators increase pressure — leading to artificial demand.
How Proper Air Management Reduces Artificial Demand
Proper air management focuses on controlling pressure, improving system efficiency, and eliminating unnecessary consumption.
- Optimize Pressure Settings
The first step is to determine the minimum pressure required for all equipment to function properly.
Conduct pressure testing at different production conditions and identify the lowest stable operating pressure. Then adjust compressor settings accordingly.
Reducing pressure even slightly can result in significant energy savings.
- Install Advanced Pressure Controls
Modern compressors and control systems allow automatic pressure adjustment based on demand.
Installing variable speed drives (VSD) or centralized control systems helps maintain stable pressure without unnecessary over-pressurization.
This reduces artificial demand and improves efficiency.
- Fix Air Leaks Regularly
Leak detection should be part of routine maintenance. Using ultrasonic leak detection tools helps identify hidden leaks quickly.
After repairing leaks, system pressure can often be reduced safely — leading to further savings.
- Improve System Design
Proper piping design reduces pressure drop and eliminates the need for excessive pressure compensation.
Use:
Larger diameter pipes where required
Looped piping systems
Properly sized air receivers
Efficient layout planning
Good design reduces artificial demand from the beginning.
- Install Proper Air Storage
Air receivers act as pressure buffers. They stabilize fluctuations and reduce compressor cycling.
With adequate storage, the system does not need to operate at high pressure to maintain stability. This helps control artificial demand effectively.
- Train Operators and Staff
Human behavior plays a major role in air management. Operators sometimes increase pressure without analyzing the impact.
Training staff about energy efficiency and proper pressure control creates awareness and reduces unnecessary adjustments.
Financial Benefits of Reducing Artificial Demand
Reducing artificial demand directly lowers electricity consumption.
Benefits include:
Lower power bills
Reduced compressor runtime
Less mechanical stress
Lower maintenance costs
Improved equipment life
In many manufacturing plants, optimizing pressure and controlling artificial demand can reduce compressed air energy usage by 10 to 20 percent.
The investment required for pressure optimization or system improvements usually has a short payback period because energy savings begin immediately after implementation.
Role of Energy Audits in Identifying Artificial Demand
A professional compressed air energy audit helps identify artificial demand by analyzing:
Actual pressure requirements
Flow measurements
Leak levels
Compressor operating patterns
System pressure fluctuations
Audit data shows where pressure is unnecessarily high and where improvements are possible.
Without measurement and data analysis, artificial demand often remains invisible. Audits make inefficiencies visible and measurable.
Conclusion
Artificial demand is one of the biggest hidden energy losses in manufacturing plants. It increases electricity consumption without providing any production benefit.
The main cause is operating compressed air systems at higher pressure than necessary due to poor control, leaks, or improper design.
Proper air management — including pressure optimization, leak control, improved system design, and monitoring — can significantly reduce artificial demand.
Reducing artificial demand improves energy efficiency, lowers operational costs, and increases system reliability.
For modern manufacturing plants, effective air management is not optional. It is a practical strategy to improve profitability and sustainability while maintaining stable production performance.