A heat-rich sector
Food plants bake, cook, pasteurize, and chill around the clock. Both the process air and the building exhaust carry large amounts of recoverable energy – often with moisture, grease, or particulates that demand a cleanable, robust exchanger.
Technology fit
- Enthalpic plate or rotary wheels recover both heat and moisture from humid exhaust (ovens, cookers, wash areas).
- Sensible plate units suit dry, particle-heavy streams where simplicity and wash-down matter.
- Run-around coils link distant process exhaust to incoming make-up air.
Where the recovered energy goes
Preheat incoming fresh air in winter, pre-heat process water, or feed space heating. In cold climates, watch frost protection on the exhaust side.
Hygiene and maintenance
Choose cores rated for frequent wash-down (stainless or coated aluminum) and plan a cleaning rhythm using our cleaning & maintenance guide. Track effectiveness and pressure drop to catch fouling early.
Payback
With continuous thermal loads, food plants often recover capital in 2-4 years. Validate with a payback calculation.
Recover heat in grade order
Food plants produce heat at several grades: hot oven and cooker exhaust, warm wash-water, and tempered building air. The most economic scheme captures the highest-grade streams first for the most valuable uses, preheating process water or space heating, and routes lower-grade ventilation air to make-up air preheat. Following the heat ladder avoids bolting on recovery where passive methods would do.
Grease, particulates, and cleanability
Process exhaust in food plants often carries grease, moisture, and food particulates, so the core must be cleanable on a routine schedule without disassembly headaches. Stainless or coated aluminum cores that tolerate wash-down, plus accessible drainage, keep hygiene audits straightforward. A fouled core not only loses effectiveness but also becomes a contamination and fire-risk point if neglected.
Control and verification
Tie recovery to production schedules where possible, since many lines run in shifts, so part-load behavior matters. Track effectiveness and pressure drop from commissioning so fouling shows as a trend rather than an unplanned stop. In cold climates, watch the exhaust side for frost when preheating incoming air. Validate savings with a payback calculation before committing capital.
Frequently Asked Questions
Which recovery type suits food plants?
Enthalpic plate or rotary wheels for humid exhaust, sensible plate for dry particle-heavy streams, and run-around coils for distant process exhaust.
How should the recovered energy be used?
Preheat incoming fresh air in winter, preheat process water, or serve space heating. Capture the highest grade first.
What hygiene issues matter most?
Choose wash-down-rated cores, stainless or coated, plan a cleaning rhythm, and watch grease and fouling for contamination and fire risk.
What payback do food plants see?
With continuous thermal loads, many recover capital in 2 to 4 years. Validate with a payback calculation.