Energy in laundry exhaust
Commercial laundries, tunnel washers, and industrial dryers exhaust large volumes of hot, moisture-laden air. That latent and sensible heat is a major utility cost; recovering it for make-up air or water preheat directly lowers gas and electricity use.
Suitable exchanger types and how they work
A sensible plate exchanger recovers heat from the dryer exhaust to preheat incoming air (or, via an air-to-water loop, the wash water). Where exhaust and make-up paths are separate, a run-around coil links them without mixing. A heat pipe core suits compact, vertical installations.
Design considerations for laundry
The exhaust is humid and can carry lint and detergent residue. Use washable, corrosion-resistant plates, fit lint filtration upstream, and provide condensate drainage. Keep pressure drop low for the dryer fans, and ensure the recovered heat has a clear use (air or water preheat) so savings are realized.
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 Commercial Laundry and Tunnel Drying 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.
