To be super energy efficient, the office of the future adopts an integrated design approach that encompasses general principles to reduce energy consumption:

  1. Passive Design – Light Pipes and Light Shelves
  2. Active Solutions – Personalized Ventilation, Displacement Cooling etc.
  3. Active Controls – Motion sensors, CO2 sensors etc.

 

 

Air-Conditioning System

Efficient Chiller Plants & Cooling Towers

 
Chillers – 21% improvement in efficiency compared to baseline values in SS 530: 2006   Cooling Towers – 33% improvement in efficiency compared to baseline values in SS 530: 2006


Variable Speed Drive to Control the Fresh Air Fan

Conventional drives only functions in uniform speed even during the periods when less air-conditioning is required. Thus, such systems are not energy efficient

Variable speed drive controls in air fan in the way that, when there is sufficient ventilation, the drive will switch to a slower mode and vice versa


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Single Coil Twin Fan Air Handling Units (AHU) & Fan Coil Units (FCU)

Location: L1 visitor centre, L1 multi purpose room, L2 library, L3 offices

Patented by the National University of Singapore, the Single Coil Twin Fan system is an innovative air-conditioning and air distribution system that improves occupants’ thermal comfort and indoor air quality in tropical buildings whilst significantly saving energy.

Energy is conserved because the fresh air fan and the re-circulated cooling air fan are controlled independently to optimize their respective airflow requirements based on the individual, localized demand for ventilation or cooling.

This differs from conventional systems where the fresh air and re-circulated air are controlled together.

The use of the Single Coil Twin Fan can possibly lead to improved air quality, thermal comfort and humidity control.


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Personalized Ventilation

Location: L3 Experimental office

Air-conditioning load can be reduced as ambient environment can be kept at slightly warmer condition (e.g. 26 degree C).

Dedicated individual cool fresh air supply duct with adjustable air volume is installed at each desk. This approach improves the air quality in the immediate breathing zone of the occupants.

As a result, the surrounding air conditioning can be set at a lower air supply rate without compromising occupant comfort, health and productivity, as this is already directly controlled via the personalized ventilation system.


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Displacement Cooling

Location: L3 Experimental office

Air is supplied at low velocity to the occupied zone, usually near the floor (pictured left). This new air is slightly cooler than the ambient air and thus has a strong tendency to fall and spread out over the floor uniformly due to gravity, without mixing with the warmer air above.

As air in the occupied zone becomes heated and polluted by occupants etc., it rises upwards due to natural convection. This continuous process leads to an upward displacement of air in the room, akin to filling a bathtub with water. Air is then extracted from the room at ceiling level.

This system can be enhanced if it is coupled with personalized ventilation system.


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T5 Lights

Location: All locations

26 % reduction in lamp operating wattage while producing the same luminous flux 90% of the area served by fluorescent light uses high frequency blast

Electronic ballasts used in T5 lamps operate in the high frequency range (40 – 100 kHz). This increases the luminous flux of the lamp by approximately 26% (In other words, reduces 26% in wattage).

The energy consumption of fluorescent lamps decreases from 43W for T8 lamps including electromagnetic ballast, to 22W for T5 lamps including electronic ballast without any compromise in the luminance.

The technology is still evolving and the direction is toward the application of advanced technologies such as Light Emitting Diode (LED) systems.


Task Lights

Location: L3 experimental office

LED tubes (more energy efficient and more lasting) are used in table lamps to provide sufficient lighting at workstations so that ambient lighting can be reduced


Dimmers

Location: All locations

Conventional lighting only has “On” and “Off” modes. A dimming feature allows reducing the amount of artificial lighting automatically when there is sufficient daylight in the space


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Sensors & Monitoring

CO2 Sensors

  These are used in areas where the air-conditioning system is served by the Single Coil Twin Fan AHUs and Single Coil Twin Fan FCUs.

The sensors are mounted in rooms and will be used to regulate the amount of fresh air provision by triggering the speed control of the fresh air fan (via Variable Speed Drives)

Motion Sensors

  Activation of light and fans based on detection of movement (indication of occupant activity)

 

Daylight Sensors

  Detection of sufficient daylight will result in automatic reduction of artificial lighting to optimize energy usage

 


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Building Management System

The Building Management System controls, monitors and manages all the equipment installed in the building.

ZEB will be monitored in real time through the installation of different types of sensors throughout the building.

Data collected in the centralized database will be used to produce audit reports as well as other knowledge that enhances the understanding of the building. It will also be used as feedback to the actively control the system.

This minimizes the energy consumption by effectively reducing wastage through the optimizing all energy usage.

It will show whether ZEB has achieved “zero energy” within the first few months of occupancy.

Examples of Building Management System applications could be the refrigeration plan control, air-conditioning fresh air flow rate control, lighting management and building energy monitoring.

Building Management Systems are prerequisite components of advance low/zero energy buildings or intelligent buildings.


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With funding support from: In partnership with: