TL;DR:
• India’s growing AI ecosystem requires sustainable and energy-efficient digital infrastructure.
• Traditional cooling methods consume large amounts of water and energy, making them increasingly unsustainable for modern AI workloads.
• Varuna, RackBank’s patented single-phase immersion cooling technology, cools servers by submerging them in a non-conductive engineered fluid instead of relying on water-intensive cooling systems.
• The solution delivers up to 90% lower water consumption, 95% lower cooling OPEX, 45% lower carbon emissions, and a cooling PUE of less than 1.03.
• Beyond immersion cooling, RackBank is advancing sustainable AI infrastructure through renewable energy adoption, carbon offset programs, Smart DCIM monitoring, and strategic expansion into Tier-2 cities.
• Varuna represents the future of sustainable datacenter cooling and responsible AI infrastructure in India.
As India races to build the digital infrastructure needed to power its AI ambitions, the need for sustainable AI infrastructure and water conscious datacenters has never been greater. Traditional cooling systems consume significant amounts of water and energy, creating new challenges for the future of sustainable datacenter cooling. This is where Varuna immersion cooling technology is redefining how modern AI infrastructure is built and operated.
At RackBank, we believe this is a problem that demands a fundamental rethink, not just incremental improvement. That is why we’ve built Varuna, our patented immersion cooling system designed to support the next generation of green datacenters and high-performance AI workloads.
Scaling Sustainable AI Infrastructure with Varuna
Varuna immersion cooling is RackBank’s patented single-phase immersion cooling system. Rather than blasting cold air or relying on water-intensive cooling methods, Varuna submerges servers directly in a non-conductive, non-toxic engineered fluid. The liquid absorbs heat directly from the hardware, which is then transferred away efficiently through a heat exchanger, no cooling towers, no evaporation, and no water waste.
The fluid itself remains in a liquid state throughout the entire process, which is what defines it as single-phase immersion cooling. This makes it significantly more stable, reliable, and efficient than many conventional cooling systems and two-phase cooling technologies that require the coolant to boil during operation.
As organizations search for sustainable cooling solutions for AI infrastructure, immersion cooling is emerging as one of the most effective approaches available today. The benefits of single-phase immersion cooling technology extend beyond energy efficiency, delivering improved hardware performance, longer equipment lifespan, and significantly lower operational costs.
The Numbers That Matter
- 90% reduction in water consumption
- 95% reduction in cooling OPEX
- 45% reduction in carbon emissions
- <1.03 cooling PUE achieved
These results demonstrate how immersion cooling reduces water consumption in datacenters while simultaneously improving operational efficiency and sustainability.
Technical Specifications at a Glance
| Technical Parameter | Varuna Specification |
|---|---|
| IT Capacity | 24U / 48U |
| Electrical Capacity | 25kW and scalable |
| Cooling Capacity | 50kW |
| Power Supply Unit | 2-way (Server + CDU) |
| Dimensions | 1190 × 700 × 1000 mm |
| Water Consumption Reduction | 90% |
| IP Rating | IP55 & IP65 |
Sustainability Beyond the Cooling System
Varuna is the centerpiece of RackBank’s broader datacenter sustainability strategy, but it is far from the only pillar. We are actively pursuing 100% green power across our campuses through long-term renewable energy partnerships, ensuring carbon-neutral operations for upcoming GigaCampuses and advancing our vision of carbon-neutral datacenters.
We complement our energy-efficiency initiatives with active carbon offset programs, including reforestation projects and solar-credit initiatives. Additionally, RackBank deploys advanced Smart DCIM (Data Center Infrastructure Management) systems for real-time monitoring, predictive analytics, and optimization, ensuring that every watt of energy is utilized efficiently.
Together, these efforts create truly energy-efficient cooling environments that support sustainable digital growth.
Building Where It Matters Most
Our decision to build infrastructure in Tier-2 cities is itself a sustainability strategy. By locating facilities closer to emerging demand centers, we reduce transmission losses, minimize strain on overburdened metropolitan infrastructure, and create meaningful local employment opportunities.
This approach supports the development of water-efficient AI datacenters in India while demonstrating that responsible computing and regional economic growth can go hand in hand.
The Future of Sustainable Datacenters in India
The datacenter industry stands at an inflection point. As AI compute demands continue to rise, so does the responsibility to ensure that infrastructure is built sustainably. The future of sustainable datacenters in India will depend on innovative technologies that balance performance, efficiency, and environmental stewardship.
At RackBank, we are not waiting for the industry to catch up. With Varuna immersion cooling, we have already built the answer and are scaling it across India, one efficient, water-conscious rack at a time. Through advanced immersion cooling technology, we are helping shape a future powered by green datacenters, resilient AI infrastructure, and truly sustainable digital growth.
FAQs
Varuna is RackBank’s patented single-phase immersion cooling technology that cools servers by immersing them in a non-conductive liquid. This innovative approach delivers higher efficiency, improved thermal management, and significantly reduced water consumption compared to traditional cooling methods.
Immersion cooling technology improves datacenter sustainability by eliminating the need for water-intensive cooling methods, reducing energy consumption, lowering carbon emissions, and increasing overall operational efficiency.
Single-phase immersion cooling keeps the coolant in a liquid state throughout the entire process, making it more stable, reliable, and energy-efficient than conventional air cooling systems and many two-phase alternatives.
Varuna can reduce water consumption by up to 90%, making it one of the most water-efficient datacenter cooling solutions available today for AI and high-performance computing environments.
As AI adoption accelerates, sustainable AI infrastructure helps reduce environmental impact while ensuring scalable, high-performance, and cost-efficient computing resources. It enables organizations to innovate responsibly while supporting India’s long-term digital and sustainability goals.