When calculating energy consumption, should equipment that uses electricity also account for compressed air?

I. The Role of Compressed Air in Energy Consumption Calculations

In industrial production, electrical energy is typically regarded as a directly supplied form of energy, while…Compressed air is a typical secondary energy source.It is a power source generated by the electrical energy consumed by the air compressor. Therefore, when assessing the energy consumption of a single piece of equipment, if that equipment uses compressed air, calculating only the electricity directly drawn by it would be incomplete.

II. Why Compressed Air Must Be Included in Energy Consumption Calculations

Incorporating compressed air into equipment energy‑consumption accounting is primarily based on the following key reasons:

• Revealing the True Cost of Energy: The production of compressed air consumes substantial amounts of electrical energy. If only the direct electricity consumption at the equipment’s point of use is accounted for, the energy costs associated with compressor operation will be overlooked, leading to an underestimation of the equipment’s true energy footprint.
• Covers transmission and conversion losses.Compressed air experiences pressure losses during transmission through the pipeline network, and the efficiency with which an air compressor converts electrical energy into pneumatic energy is not 100%. These losses at each intermediate stage must ultimately be allocated to the equipment that uses compressed air.
• Meet the requirements of the energy management system.In a standard energy management system, it is required to conduct full‑life‑cycle accounting for all energy inputs and outputs. As an important power‑transmission medium, compressed air must be included in the overall energy balance calculation.

III. How to Scientifically Calculate the Total Energy Consumption of Equipment Containing Compressed Air

To accurately calculate the energy consumption of equipment containing compressed air, it is necessary to establish a sound conversion and allocation mechanism:

• Determine the conversion factor.Based on the actual operational energy efficiency of air compressor units, calculate the standard electricity or standard coal consumption per unit volume of compressed air produced, and establish a scientifically sound energy conversion model.
• Accurate measurement of usageInstall a flow meter at the equipment end that uses compressed air to accurately record the equipment’s compressed air consumption over a specified period.
• Cumulative total energy consumption: Add the equipment’s direct consumption of other energy sources to the converted energy consumption of compressed air to obtain the equipment’s total energy consumption.

IV. The Significance of Incorporating Compressed Air Energy Consumption into Enterprise Management

Comprehensive accounting of compressed air energy consumption plays a positive role in helping enterprises enhance their energy management. First, it enables managers to identify high‑consumption equipment, allowing for targeted modifications to air‑distribution systems or upgrades to machinery. Second, by monitoring the ratio of compressed air input to output, it becomes possible to promptly detect hidden sources of energy waste, such as leaks in the piping network. Finally, precise, integrated energy‑consumption data provides a more reliable basis for product cost accounting and process optimization.