A building automation system or BAS is a network of controlling and monitoring devices mainly responsible for the heating, ventilation, and air conditioning (HVAC) control system in large facilities and commercial buildings. Building automation systems are most commonly implemented in large facilities such as healthcare facilities, schools, universities, hotels, residential buildings, and data centers. A BAS network allows building operators to supervise and control the HVAC systems from a centralized location known as the Building Management System or BMS. VAV system, the air handling unit (AHU) and the VAV boxes are physically separated from each other, and each one has its own controller, also distanced from one another. However, for a VAV system to operate effectively, the VAV Boxes and the AHU have to talk to each other; in other words, they need to share information to properly adjust their setpoints based on zone heating or cooling demand.
Why DOAS (Dedicated Outdoor Air Systems) are a Must-Have—Especially in Humid Climates
If you're designing or operating buildings in high-humidity areas like Dubai or Basrah, a DOAS isn't just a nice-to-have—it’s essential.
DOAS handles one job extremely well: ventilating and dehumidifying 100% fresh outdoor air before it enters your space. This helps prevent excess moisture from sneaking in and creating comfort, mold, or maintenance problems. That fresh air is conditioned separately and then distributed to spaces through ceiling diffusers or directly into systems like:
✅ Water Source Heat Pumps (WSHP)
✅ Variable Refrigerant Flow (VRF) Systems
✅ Air Handling Units (AHUs)
✅ Chilled Beams
✅ Fan Coil Units, and more.
So why not just let the AHU handle everything, including dehumidification?
Good question. While an AHU can technically handle fresh air and space conditioning together, splitting the duties between a DOAS and other systems ensures each one performs better. DOAS focuses on treating outdoor air efficiently, while your VRF, WSHP, or AHU can fine-tune the space conditions like temperature and humidity inside. This separation leads to better comfort control, lower energy consumption, and a cleaner, healthier indoor environment.
Plus, having a dedicated system for outdoor air makes it easier to meet modern building codes (ASHRAE 62.1 ventilation standard) and decouple ventilation from thermal loads, which is critical in energy-efficient design.
If you're planning your next commercial project—mall, hospital, hotel, or office tower—don’t overlook the power of a properly designed DOAS. It's one of those systems that pays for itself in performance, compliance, and occupant satisfaction. 👷♂️🏢
DOAS handles one job extremely well: ventilating and dehumidifying 100% fresh outdoor air before it enters your space. This helps prevent excess moisture from sneaking in and creating comfort, mold, or maintenance problems. That fresh air is conditioned separately and then distributed to spaces through ceiling diffusers or directly into systems like:
✅ Water Source Heat Pumps (WSHP)
✅ Variable Refrigerant Flow (VRF) Systems
✅ Air Handling Units (AHUs)
✅ Chilled Beams
✅ Fan Coil Units, and more.
So why not just let the AHU handle everything, including dehumidification?
Good question. While an AHU can technically handle fresh air and space conditioning together, splitting the duties between a DOAS and other systems ensures each one performs better. DOAS focuses on treating outdoor air efficiently, while your VRF, WSHP, or AHU can fine-tune the space conditions like temperature and humidity inside. This separation leads to better comfort control, lower energy consumption, and a cleaner, healthier indoor environment.
Plus, having a dedicated system for outdoor air makes it easier to meet modern building codes (ASHRAE 62.1 ventilation standard) and decouple ventilation from thermal loads, which is critical in energy-efficient design.
If you're planning your next commercial project—mall, hospital, hotel, or office tower—don’t overlook the power of a properly designed DOAS. It's one of those systems that pays for itself in performance, compliance, and occupant satisfaction. 👷♂️🏢
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