Case study
ITE College Central
Twelve PDC coils sized for a 91.2 kW load in a 456 m² sports studies lab.
View caseCooling that moves without fans, ducts or a plant room.
Passive displacement ventilation supplies chilled air at floor level and lets natural convection carry it through the occupied zone.
20%+
Energy saved against a conventional chilled water system
0.25 kW/RT
The airside load a conventional AHU/FCU carries — removed entirely
First
SGBC-certified PDV system in Singapore
10+ yrs
Largest installed PDV base in Singapore
How it works
Displacement, without the fan.
Passive displacement ventilation resembles conventional displacement ventilation: air is supplied at floor level and extracted at ceiling level. The difference is that no mechanical fans propel air into the room. PDV relies entirely on natural convection to deliver chilled air to the occupied zone.
Removing the fan removes the ductwork, the plant room and the airside energy that goes with them — which is where the saving comes from.
01
Supplied at floor level
Chilled air enters low and slow, so it pools in the zone people actually occupy.
02
Carried by natural convection
Occupants, lighting and equipment warm the air, which rises on its own. No fan, no vibration, no draft.
03
Extracted at ceiling level
Warm, stale air leaves at high level, so the coolest, freshest air stays where it is needed.
04
Pre-fabricated and tested off site
Coils arrive built and proven, so site time is installation rather than assembly.
Benefits
What you get instead of AHUs and FCUs.
The comparison below is against a traditional AHU / FCU installation serving the same space.
- Virtually maintenance free.
- Requires no plant room, and no overhead or under-floor ducting.
- Reduces building dead load.
- Eliminates undesirable draft.
- Vibration and noise free.
- Integrates easily into interior design.
- Can be completely pre-fabricated and tested off site.
- Saves at least 20% of required energy compared with a conventional chilled water system.
Photography: Twenty80 PDV coil installed at low level in an occupied space
The Twenty80 PDV coil
The Twenty80 coil is YITAC's own design, supplied with an integrated drain pan and insulation. Given correct design and installation, condensation should not occur.
Technical characteristics
Where the saving actually comes from.
A conventional system using AHUs or FCUs consumes approximately 0.25 kW/RT — between 10% and 20% of total building energy. PDV removes the airside component from the building altogether, saving capital cost upfront and electrical consumption for as long as the building runs.
- Airside consumption, conventional AHU / FCU
- ~0.25 kW/RT
- Airside share of total building energy, conventional
- 10–20%
- Airside component under PDV
- Removed
- Mechanical fans in the conditioned space
- None
- Coil
- Integrated drain pan & insulation
- Green label
- SGBC, 3 ticks
Dimensions and full technical data are issued on enquiry rather than published. Request the data sheet.
Applications
Where PDV is installed.
More than a decade of passive displacement work in Singapore, largely in education, institutional and sports facilities.
Education & campus
Nanyang Technological University, Singapore Institute of Technology Punggol, Temasek Polytechnic, INSEAD Asia Campus, Dulwich College.
Institutional
Maritime and Port Authority of Singapore.
Sports & recreation
Kallang Tennis Centre, and training and studio spaces with high occupant loads.
Certified
First SGBC-certified PDV system in Singapore, and AHRI certified
Connected work
The proof, the service and the next system.
Service
Energy Audit & OSE
Establish the baseline that tells you whether PDV is the right answer.
View service
Solution
Pre-insulated ducting
Where ductwork is unavoidable, PIRALU and PalDuct cut its weight and its install time.
View solutionTell us the space and the load, and we will size the coils.
Talk to an engineer