Manage the Outdoor Air Moisture Load
Outdoor air represents the largest source of moisture in most buildings. On hot and humid days, Airxchange® energy recovery components dehumidify outdoor air without condensation. On cold and dry days, Airxchange® energy recovery components humidify the outdoor air minimizing the need for additional building humidification.
Combined Systems Can Achieve Humidity Control
An Airxchange® energy recovery component combined with standard HVAC systems is likely to control humidity in even the most humid climates. A Tiax, LLC report provides further details. By avoiding the expense of additional mechanical dehumidification helps pay for the Airxchange® energy recovery component.
Moisture Removal Capacity Comparison
| OA Conditions | OA Moisture Load | DX System (20 Tons DX) | DX/ERV System (15 Tons DX, 5 Tons ERV |
| 95ºDB,78ºWB | 7.1 gals/hour | 6.3 gals/hour | 9.6 gals/hour (4.9 from ERV) |
| 87ºDB,80ºWB | 10.8 gals/hour | 7.6 gals/hour | 13.3 gals/hour (13.3 from ERV) |
| 75ºDB, 72ºWB | 7.2 gals/hour | 9.1 gals/hour | 11.5 gals/hour (4.7 from ERV) |
Calculations assume a 20 ton load with 2000 cfm of outdoor air with indoor design condition of 75/63.. SHR of DX was assumed to be .75 for 95/78 condition, .70 for 87/80 condition, and .65 for 75/72 condition. Airxchange® energy recovery components assumed effectiveness of 70%.
Airxchange® Humidification Examples:
| OA Conditions | Moisture Loss Due To Outdoor Air | Airxchange® Humidification |
| 26ºDB, 25ºWB | 7.3 gals/hour | 5.3 gals/hour |
| -4ºDB, -5ºWB | 9.8 gals/hour | 7.2 gals/hour |
| -16ºDB, -17ºWB | 10.1 gals/hour | 7.5 gals/hour |
Calculations assume 2000 cfm of outdoor air with indoor design condition of 72/54. Airxchange® energy recovery components assumed to have effectiveness of 70%