INDIRECT DIRECT EVAPORATIVE COOLING (IDEC) systems reportedly consume up to 80-85% less electricity than traditional compressor-based air conditioning. Since they use only fans and small pumps rather than power-intensive compressors, their advocates say they reduce the connected electrical load by 50-75%, significantly lowering utility demand charges.

Proponent say an appealing feature of IDEC systems is their Inverse Performance Curve. Unlike conventional air conditioning units that lose efficiency as outdoor temperatures rise, IDEC systems often provide increased cooling capacity as ambient air gets hotter, they add.

Speaking in the specific VRF context, proponents speak of “VRF and IDEC hybrid systems”. They say studies of integrated watercooled VRF and indirect evaporative chillers are demonstrating total energy reductions of approximately 15.8% compared to standard dehumidifier systems. They speak of using IDEC to handle up to 50% of the total cooling load in a hybrid setup, which reduces the required capacity and energy of the primary VRF compressor. They also highlight the role of high-efficiency VRF (with COPs exceeding 5.0) coupled with IDEC in meeting 2026 sustainability standards for schools, hospitals and high-rise residences.

And as the discussion intensifies for the HVACR industry to play its part in lowering the use of climate-damaging refrigerants, proponents of IDEC systems say they eliminate the need for high-GWP (Global Warming Potential) refrigerants. This, they add, ensures compliance with 2025 EPA regulations and the Kigali Amendment to the Montreal Protocol, which push for the phase-down of traditional HFCs.

By way of further ammunition, proponents of IDEC systems point to their role as a core, eco-friendly cooling technology that uses only water as a working fluid, significantly reducing the carbon footprint associated with traditional AC refrigerants.

And going with the clamour for smart systems integration, advocates of IDEC systems say they enable integrating with Building Automation Systems (BAS) for adaptive regulation based on real-time environmental data, thus optimising energy use.

Broadly speaking, (IDEC) is on a roll in Saudi Arabia, if proponents are to be believed. Adding heft to the “momentum” is regulation specific to IDEC in the Kingdom. The “IDEC Innovations” conference will spotlight the regulation and provide an opportunity to present case studies that indicate acceptance, progress and yet another peg in the sustainable cooling pole.

• IDEC-related regulation in the Kingdom
• Using solar energy (e.g., solar collectors or PV panels) to power the fans and pumps of IDEC systems, enabling off-grid or zero-energy operation
• Integration of IDEC with other cooling technologies like mechanical vapour compression (DX) systems, desiccant cooling systems or chilled water systems to enhance efficiency and break climate limitations
• IDEC in data centres: Using IDEC for low-carbon, energy-efficient cooling while maintaining low humidity to prevent equipment damage
• IDEC in commercial and industrial buildings: Application in large spaces, manufacturing facilities and offices to reduce energy costs and meet green building standards
• IDEC in humanitarian shelters: Providing thermal comfort in nontraditional structures, like emergency relief tents under harsh climate conditions
• Strategies for applying IDEC in diverse climates – hot-arid versus hot-humid regions – by adjusting operating modes (dry, wet, mixed) to maximise effectiveness
• Integrating advanced MERV-rated or HEPA filters and UV-C sterilisation within the IDEC air stream to minimise the spread of airborne viruses and particulates (PM2.5)
• Analysing the effectiveness of IDEC systems in maintaining the “optimal humidity zone” (40%–60%) towards reducing respiratory infections and improving skin comfort
• and more …

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