Heat recovery in food production
Food lines — sausage curing, noodle and vermicelli drying, casing (intestine) processing, and snack baking — run warm air that is then exhausted. Recovering that heat for incoming make-up air reduces steam or electric heating cost while keeping the process stable.
Suitable exchanger types and how they work
Hygienic plate air-to-air exchangers are preferred because the two airstreams never mix, so no product odor or particulate reaches the supply air. A counterflow plate maximizes recovery; an enthalpy wheel can also manage humidity in humid products. See our plate selection guide for sizing.
Design considerations for food duty
Hygiene dominates: choose washable, food-grade aluminum or stainless plates, provide clean-in-place access and condensate drains, and avoid crevices. Size face velocity for low pressure drop and plan a summer bypass. Because food air can carry grease or flour dust, schedule cleaning per our maintenance SOP.
Typical Application Environments
Heat recovery is valuable wherever a building or process expels warm, stale air while drawing in cold or hot fresh air. Common sites include factory make-up air systems, commercial kitchens, paint booths, drying rooms, laboratories, and cleanrooms. In each case the exhausted air still holds usable thermal energy, and capturing it reduces the heating or cooling demand placed on the primary plant.
Matching the Unit to the Duty
The right selection starts with the air volume, the temperature difference between streams, and the cleanliness of the exhaust. Clean, steady flows suit plate exchangers; humid or dusty exhaust may need a rotary wheel with purge or a unit arranged for easy wash-down. Pressure drop must stay within the fan curve, and the core material must resist any contaminants present in the airstream.
Integration Tips
For the Heat Exchanger for Food Processing Lines duty, position the exchanger so the exhaust is filtered before it reaches the core, and provide condensate drainage where the supply side may drop below the dew point. Balanced supply and exhaust fans keep the building neutral in pressure, which protects indoor air quality and process control. A bypass damper lets the system free-cool in mild weather.
Frequently Asked Questions
Can it handle greasy kitchen air? Yes, with a rotary wheel and a wash cycle, though the exhaust should first pass a grease filter. Will it cause condensation? Some condensate is normal in winter; provide a drain or a defrost strategy on the supply side.
