The Building

A refrigerated warehouse, -25 C inside, frequent door traffic, warm make-up air needed for defrost and personnel doors.

Step 1 - Duty

Make-up air 6,000 m3/h, outdoor summer 30 C, indoor -25 C; the load is refrigeration, not heating.

Step 2 - Technology

Plate core sized for low face velocity, with a defrost strategy for the cold intake.

Step 3 - Frost

Below -2 C exhaust dewpoint, add a preheat coil or timed bypass set from the coldest week, not the average.

Step 4 - Result

Pre-cooling incoming air trims refrigeration energy by 10 to 25 percent depending on door traffic and climate.