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%