The ventilation heat-loss problem

Pig, poultry, and rabbit barns need continuous ventilation to remove ammonia, CO2, moisture, and pathogens — but in winter that ventilation throws away heated indoor air. Cold-climate barns can lose most of their heating energy through the exhaust stream alone. An air-to-air heat-recovery ventilator captures heat from the outgoing barn air and transfers it to the incoming fresh air while keeping the two streams separate.

Suitable exchanger types and how they work

Plate-type heat-recovery ventilators suit most livestock buildings. In cold climates a counterflow plate maximizes recovery and reaches the lowest supply temperature, while a built-in bypass handles summer. Where humidity control matters, an energy-recovery ventilator (ERV) also transfers moisture between streams.

Design considerations for barns

Barn air is corrosive (ammonia) and dusty. Specify epoxy-coated or stainless cores and washable plates, plan condensate management, and add a defrost strategy (bypass or preheat) for freezing nights. Size the unit to the required ventilation rate rather than total airflow, and provide easy access for regular cleaning of the core and drains to keep pressure drop and ammonia exposure under control.