Passive Displacement Ventilation (PDV) System
Passive displacement ventilation, or PDV, is an innovative air distribution system that closely resembles the displacement ventilation system. In both systems, air is supplied at the floor level and extracted from the room at the ceiling level. However, with PDV, no mechanical fans are used to propel air into the room. PDV systems rely completely on the process of natural convection to deliver the chilled air to the end user.
How It Works
PDV relies on the natural convection of heat transfer without the need for mechanical fans to deliver the chilled air to the end user. The PDV coil supplies cold air supply directly to the occupants or heat load within the indoor space at very low velocity. The cold air will spread across the rooms until it comes into contact with heat sources. Upon contact with the heat source, the cold air will slowly rise as it picks up heat from the occupants or heat load. The warm stale air will rise towards the ceiling where it will be exhausted from the space, by taking advantage of the natural buoyancy of warm air, stratification is achieved across the height of the room.
Twenty80 PDV Coil
Twenty80 PDV Coil copyright design comes with integrated drain pan and insulation, condensation issue should not happened given proper design and installation.
Using PDV System conventional over traditional AHUs/FCUs system will yield the following benefits:
• Virtually maintenance free
• Requires no plant room or over-head or under-floor ducting
• Reduces building dead load
• Elimination of undesirable draft
• Vibration and noise free
• Integrates easily into interior design
• Can be completely pre-fabricated and tested off site
• Consumes absolutely zero airside energy, thus savings up to 20% of a building energy.