Heat Recovery for Industrial Drying and Agriculture

Industrial drying accounts for a large share of energy consumption in food processing, wood, textiles, ceramics, and agriculture. Most of that energy leaves the dryer as hot, humid exhaust air. A well-designed heat recovery system can recapture much of that energy and pre-heat the incoming drying air.

Why Drying Exhaust Is Ideal for Heat Recovery

• High and stable exhaust temperatures
• Large airflow rates
• Continuous operation, giving fast payback
• Reduced demand on burners, boilers, or electric heaters

Plate Exchangers for Dehumidification

Counter-flow plate heat exchangers are often the best choice for drying applications because they recover sensible heat without adding moisture back into the supply air. This is especially important in processes such as:

• Grain, fruit, and vegetable drying
• Wood and paper drying
• Textile finishing
• Powder and chemical drying

System Design Tips

• Protect the exchanger with filters to prevent dust and fiber buildup.
• Choose stainless steel or coated plates if the exhaust contains acids, oils, or solvents.
• Install bypass dampers for summer or high-humidity conditions.
• Use variable-speed fans to match production rate.

Expected Savings

Depending on exhaust temperature, airflow, and operating hours, industrial drying heat recovery systems often reduce heating energy by 30–60 %. Payback periods of 1–3 years are common.

Reliable operation in drying duty depends on keeping the core clean and the airstream balanced. Fit pre-filters sized to the dust load and schedule cleaning before pressure drop rises above the design margin. Where the exhaust carries fibers or sticky particulates, choose wide-spaced plate channels or a heat-pipe bank that is easy to wash. A variable-frequency drive on the supply fan lets throughput follow the production rate, so recovery scales with demand instead of running flat out. Condensate from the cooled exhaust must drain safely and clear of the product zone. For continuous lines, consider N plus one fan redundancy so a single fault does not stop the dryer. Our plate heat exchangers are offered in stainless and coated versions for aggressive drying exhaust.

Frequently Asked Questions

Can recovered heat handle the full drying load?
Usually not. It pre-heats the air, reducing the primary heater’s workload.

Is humidity recovery useful in drying?
Generally no. Adding moisture back into drying air would hurt efficiency, so sensible-only plate exchangers are preferred.

Frequently Asked Questions

Can recovered heat handle the full drying load?

Usually not. It pre-heats the air, reducing the primary heater’s workload.

Is humidity recovery useful in drying?

Generally no. Adding moisture back into drying air would hurt efficiency, so sensible-only plate exchangers are preferred.