The industrial sector, accounting for 65% of energy consumption and over 70% of carbon emissions, is navigating a period of transitional pains. Traditional PCB factories rely heavily on gas boilers to provide heat for wet processes and Air Handling Units (AHU), resulting in high Scope 1 direct carbon emissions. Simultaneously, low-grade waste heat from cooling water used in chillers and air compressors is often lost through cooling towers, representing a form of "invisible carbon" waste.

How can decarbonization be achieved without halting production or undergoing massive structural overhauls? The collaboration between Delta and a landmark manufacturing plant in Zhuhai provides the answer: activating existing resources through intelligence to turn waste heat into a "green energy engine." This project has achieved an annual reduction of 1,200 tons in Scope 1 emissions and over 2 million RMB in annual fuel cost savings.

Precise extraction of "waste heat potential"
This landmark manufacturing facility faced two primary challenges:
1. Decarbonization Goals: The need to reduce and eventually eliminate Scope 1 direct carbon emissions.
2. Economic Efficiency: The desire to transform wasted residual heat into usable energy to lower operational costs.

Adhering to the principle of "optimizing decarbonization at the energy supply side with minimal disruption to production," the Delta team conducted a deep investigation and identified a key breakthrough: the cooling water from the plant’s chillers and air compressors had long been dissipating heat through cooling towers. This massive volume of low-grade waste heat was essentially "invisible carbon" being released into the atmosphere. The total energy from these sources was sufficient to replace the steam provided by gas boilers; all that was needed was a customized renovation solution.

A zero-carbon heating network via cascaded heat pumps
The Delta team recognized the "dual-source heterogeneous" nature of the waste heat, while the cooling water from chillers and air compressors are both low-grade heat sources, their temperature differences meant they could not directly meet the specific requirements for 50°C hot water for air conditioning and 140°C steam for production lines. To solve this, the team utilized high-efficiency heat pump technology (with a COP 3–5 times that of electric heating) to design a "cascaded heating" solution:
- High-temperature heat pump A: Directly upgrades the low-temperature waste heat from the chiller cooling water to the temperature required for the AHU system.
- High-temperature heat pump B & steam heat pump: Incrementally raises the air compressor unit's residual heat to 140°C for use on the production lines.

Three-layer control system ensures production stability

To ensure stable system operation, Delta leveraged its strengths as a smart manufacturing provider to build an "Information-Control-Decision" three-layer architecture:
- Information layer: A high-level thermal energy management platform provides real-time monitoring of thermal flows across the plant and dynamically optimizes distribution strategies.
- Control layer: Deep integration between heat pump units and sensors ensures millisecond-level response times for temperature, pressure, and flow data.
- Decision layer: Built-in carbon conversion algorithms automatically generate emission reduction reports to support ESG management.

A model for industrial thermal decarbonization: Breakthroughs in economy and environment
Since the project's official launch, it has achieved a "double breakthrough" in energy efficiency and environmental benefit:
1. Carbon Reduction: An estimated annual reduction of 1,200 tons of Scope 1 emissions, lowering the plant’s overall carbon footprint by 8.7%. Overall thermal efficiency has improved by 3%, replacing over 65% of the original boiler heating load.
2. Economic Benefits: Based on a steam cost of 300 RMB/ton, the project is expected to save over 2 million RMB in annual fuel costs.

As the project manager evaluated: "There was zero downtime for the production lines during the renovation—employees didn't even notice a change. However, the carbon fees and energy expenses on our monthly bills have quietly 'slimmed down'." This practice of turning waste heat into green energy proves that true low-carbon transformation is not about sacrificing production for the environment, but using intelligence to ensure every unit of energy is utilized to its full potential.