The Building

An older office, 10,000 m3/h constant-volume exhaust, heated winters, no recovery. Goal: cut the ventilation heating load cheaply.

Step 1 - Duty

Supply and exhaust both 10,000 m3/h, outdoor winter -5 C, indoor 21 C, desired supply at least 16 C.

Step 2 - Technology

Choose a crossflow plate core: simple, low maintenance, no humidity need in this climate.

Step 3 - Size

Target 70 percent effectiveness. At 20 K difference that recovers about 46 kW of heating load.

Step 4 - Fan Check

Confirm the existing fan can handle the added ~120 Pa. If not, plan a fan upgrade.

Step 5 - Result

Ventilation heating load cut by roughly two-thirds; payback within a few heating seasons.