These systems use natural convection
principles to provide a comfortable temperature indoors. The hot is allowed to
rise to the ceiling in this process. The air is allowed to diffuse in the floor
level at the occupied space. When the air rises eventually, the heat gets
collected from the equipment and people in the room. So ultimately the occupied
space becomes a pool of cool air which doesn’t interfere with the heat gains,
occupant CO2 and smells.
The Displacement Ventilations systems
are a major type of cooling system that is served by central AHUs or air
handling units and chillers. Unlike mix flow ventilation systems aiming at
diluting the entire airspace, displacement ventilation systems directly remove the heat by consolidating it at the top
space. It supplies air from various outlets at a low velocity close to the
floor. The cool air gets heated and rises to the top for extraction. This air
doesn’t re-enter the occupied space.
Advantages
- Have the potential for good energy efficiency.
- The quality of air produced is better compared to FCUs (fan coil units) or VAV (variable air volume) systems as the air doesn’t get mixed up.
- They can also be used in larger floors.
- Less expensive than most cooling systems.
- They use less ductwork and fewer diffusers.
- They improve quality of indoor air and reduce the CO2 accumulation.
- Unlike mix flow systems, DVs have higher effective ventilation.
- For most time of the year, free cooling can be available.
- The heat gains from roof and lights can be eliminated by building cooling loads like exhaust and 100% use of outdoor air.
- Compared to AHUs the maintenance level of DV is low.
Cost
comparison
These are less costly than the
refrigerant systems or conventional fan coil units. They are mostly preferred
in areas with normal cooling requirements like IT rooms over localized cooling
systems.
Applicable
Buildings
These are best suited for building with
high ceilings and offices with low-density space. The system has been improving
as it is being applied in many areas like schools and offices.
Comfort
and temperature control
They provide a very comfortable
environment for working as the level of outside air is higher in DVs and also
less return air mixing. It avoids creating uncomfortable air drafts by
supplying air at higher temperatures most likely above 63 F and also at a lower
velocity reducing pressure requirements. This makes the environment more
comfortable for occupants.
Cooling
process pipework
A Process Cooling Pipe work system includes industrial cooling, process cooling systems
and many more process with applications in areas like chemical, pharmaceutical,
gas and food industries. It is one of the main systems in the building and
construction industry. It is a very comfortable and reliable cooling system.
Its services include:
- Condensate and steam pipework.
- Thermal fluid pipework.
- Cooling water pipework.
- Compressed air pipework.
- Hot water flow return and low-temperature pipework.
