Mono Ethylene glycol (MEG) is a versatile chemical compound with a wide range of industrial applications. Its properties as a heat transfer fluid make it particularly valuable in the HVAC industry, where it plays a critical role in thermal energy storage (TES) systems.
Understanding MEG and its Role in Thermal Energy Storage
MEG, also known as ethylene glycol, is a clear, colourless liquid with a sweet taste. Its ability to mix with both water and other organic compounds makes it an ideal base for various industrial fluids. One of its primary uses is as a coolant in automotive engines, but its applications extend far beyond this.
In the realm of HVAC, MEG is employed in two primary ways:
- Burst Protection: Protecting piping systems from freezing during cold weather is essential. MEG-based antifreeze solutions prevent pipe damage by lowering the freezing point of water.
- Heat Transfer Fluid: MEG is a key component in thermal energy storage (TES) systems. These systems store excess heat for later use, improving energy efficiency and reducing peak load demands.
TES systems, particularly those utilising latent heat storage, rely on MEG as a heat transfer fluid. These systems consist of a tank filled with nodules and MEG. The nodules store thermal energy, while the MEG facilitates heat transfer between the nodules and the system. The result is a significant reduction in chiller capacity and energy consumption.
Rolfes Water’s Expertise in MEG Handling and Management
Recently, Rolfes Water successfully completed a top-up of an existing thermal energy system in Menlyn. This project involved several critical steps:
- Safe Removal: The team carefully extracted 12,000 litres of the existing system water, taking precautions to prevent damage to the Cristopia nodules.
- Responsible Disposal: The removed water was transported back to the Rolfes Water plant for proper disposal, ensuring environmental compliance.
- MEG Reintroduction: The final step involved introducing 11,000 kilograms of high-quality MEG into the ice tanks, restoring the system’s efficiency.
This project highlights Rolfes Water’s expertise in handling hazardous chemicals like MEG, as well as its commitment to environmental responsibility.
The Benefits of Thermal Energy Storage
By utilising MEG in TES systems, building owners and operators can enjoy several advantages:
- Energy Cost Reduction: By storing excess heat for later use, TES systems can significantly reduce peak energy consumption and associated costs.
- Improved System Efficiency: Smaller chillers and other equipment can be installed, leading to lower initial investment and operating expenses.
- Enhanced Sustainability: TES systems contribute to reduced carbon emissions by optimising energy use.
- Increased Comfort: Consistent temperature control can be achieved, enhancing occupant comfort.
MEG is an indispensable component in modern HVAC systems, particularly in the context of thermal energy storage. Our successful completion of the Menlyn project demonstrates our capabilities in handling and managing this critical chemical. As energy efficiency and sustainability become increasingly important, TES systems with MEG as a heat transfer fluid will likely play a growing role in the HVAC industry.
