Johnson Controls has launched an Absorption Chiller Reference Design Guide aimed at data centers running on on-site power generation, with the goal of converting generator waste heat into useful cooling and freeing up electrical capacity for AI workloads.
The company frames the guide as a repeatable blueprint for pairing on-site generation with absorption cooling so that heat that would otherwise be rejected can offset electrically driven cooling load. Johnson Controls cites a modeled “AI Factory” case in which “57% of energy” is typically lost as waste heat from on-site power generation, and says using that waste heat for absorption chilling can reduce cooling-related electric demand by up to 44%.
In the same modeled 1 GW-scale facility scenario, Johnson Controls says those efficiency gains can support up to 97 MW of additional AI computing capacity without increasing on-site power generation. The company also ties that modeled capacity uplift to a revenue figure—“up to $18 billion” over the life of the facility—based on what it calls a typical US AI Factory model.
On facility metrics, Johnson Controls says the reference design “can achieve” a PUE as low as 1.23 with zero on-site water use, and that potential outcomes include up to 43% lower CO₂ emissions from the cooling system. These figures are presented as modeled, illustrative results, with outcomes dependent on site-specific conditions.
The guide is intended to scale as a modular architecture “from 100 MW campuses to gigawatt-scale AI Factories” without redesign, which Johnson Controls says can help operators bring new capacity online faster. Practically, the big engineering bet here is that recovering heat from on-site generation can shift a meaningful chunk of cooling energy away from the electrical side of the house, which is exactly where many AI buildouts are running into hard limits.
“One of the biggest untapped opportunities in data centers is the heat they generate,” said Austin Domenici, president, Global Data Center Solutions, Johnson Controls. Katie McGinty, vice president and Chief Sustainability and External Relations Officer, Johnson Controls, added: “By converting waste heat into useful cooling, we’re turning a resource already bought and paid for into an asset rather than a disposal liability.”
Source: Johnson Controls
