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| Displacement Ventilation |
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| mixing ventlation |
Dis.ment ventitation |
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| Introduction |
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Displacement Ventilation (DV) originated in industrial facilities in Europe as an effective way to remove contaminants from the occupied zone. It has since gained popularity in a variety of applications in both Europe and North America due to its superior air quality, thermal comfort, and energy efficiency DV provides high temperature, low velocity supply air, relying on the buoyancy forces of air to drive air motion. The result is high ventilation effectiveness and improved thermal comfort delivered in an energy efficient manner
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| Displacement differs from traditional overhead mixing systems in several fundamental ways: |
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| Advantages of Displacement Ventilation |
| Superior Air Quality |
In DV systems, the supply air must pass through the breathing zone before being exhausted, because it travels from a low level to ceiling mounted returns. As it does this, it carries contaminants away from the occupant, leading to a high Ventilation Effectiveness compared to mixing systems. |
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| Energy Efficiency |
 The lower pressure drop associated with displacement ventilation outlets, along with the selection of smaller fan components, may allow for a reduction in fan energy.
Since supply air temperatures are higher with DV systems than with overhead air distribution systems, economizer operating hours can be increased to take advantage of free cooling.
There is also the potential for a reduction in the air volume required to satisfy room loads, depending on the room type and location. |
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| Thermal Comfort |
DV delivers supply air at an average of 40 fpm and at a temperature no more than 10°F cooler than the room air. This high temperature, low velocity supply air results in less draft and a lower percentage of people dissatisfied per ASHRAE Standard 55-2004. |
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| Quiet Operation |
| Displacement diffusers distribute supply air into a room at a very low velocity, resulting in whisper quiet operation. |
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| Mechanical Flexibility |
DV diffusers are often floor or wall mounted, accommodating applications where overhead space is limited, or where space for ducting along the walls and ceiling is limited. |
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| Schools: |
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Indoor air quality, silent operation, and thermal comfort are all important design considerations for schools. Displacement ventilation provides all three, resulting in many school districts mandating the use of DV in schools.
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| Large Public Spaces: |
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Large public spaces often have large, open areas, high ceilings, and varying occupancy levels. Since displacement systems only condition the first six feet of a space, there is potential for large energy savings in spaces with high ceilings. Additionally, many large public spaces – such as theatres, airports, and places of worship – can have specific architectural designs that the air distribution must accommodate. Price has the custom design capability to provide diffusers that integrate seamlessly into architectural features.
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| Health Care: |
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DV has become an accepted technology in hospital patient rooms and can provide a cleaner, safer, environment for patients, health care providers, and visitors while providing energy savings through a lower air-change requirement. Price offers several proven configurations for DV in health care, including stainless steel construction and provisions for ease of maintenance.
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| Industrial Facilities: |
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Displacement ventilation was originally introduced in Europe to manage the pollutants found in industrial facilities, and is ideally suited for this application.
Displacement systems can carry harmful contaminants such as welding and adhesive fumes (when they are lighter than air) up and out of the breathing zone, leaving employees with safe, healthy breathing air..
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| Product List |
| DF Series |
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| Industrial Displacement Diffusers |
Floor Mounted Diffusers |
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