Food and beverage plants, with their dual appetite for heat and cold, are emerging as ideal candidates for waste-heat-driven absorption chilling. By using thermal energy that would otherwise be rejected, these facilities are displacing electric compression cooling and trimming peak demand charges.
The model is straightforward: high-grade waste heat from pasteurization, sterilization, or boiler flue gas drives a lithium bromide absorption chiller that produces chilled water for process and storage. Where heat is available at 90°C or above, single-effect units deliver COPs competitive with electric chillers on a primary-energy basis.
Dairy, brewing, and ready-meal producers report the largest gains, often integrating recovery heat exchangers upstream of the chiller to stabilize supply temperature. The result is a self-reinforcing loop: less grid electricity, lower carbon intensity, and steadier production costs.
Engineers caution that successful deployment depends on matching heat-grade to chiller type and ensuring year-round cooling load. Hybrid systems that blend absorption and mechanical cooling provide the flexibility needed for seasonal demand swings.
With refrigeration accounting for a large share of food-sector electricity, heat-driven cooling is positioned to become a standard efficiency measure rather than a showcase project.
Matching Heat Grade to Chiller Type
Success hinges on pairing the available waste-heat temperature to the right absorption machine. Single-effect lithium bromide units suit heat at 90 degrees C and above and are the workhorse for dairy, brewing, and ready-meal lines. Below that, consider double-effect or a hybrid with mechanical cooling to cover shoulder seasons. Size the chiller to the steady cooling load, not the peak, and stabilize the supply temperature with an upstream recovery exchanger so the chiller sees a constant inlet. That steadiness is what protects both COP and the payback case.