FUTURARC INTERVIEW
be high, and thermal transfer would skyrocket. To address this, and also to be able to minimise the size of air-conditioning devices, the selection of glass type is crucial. The glass selection is a DGU with U-value 1.57, SC 0.23, VLT 0.37, which results in a low OTTV. The glazing used is a 6-millimetre clear glass with 30 per cent white colour solid polka dots. The blue-grey double low-e glazing has a visible light transmission of 37 per cent, as well as a 24 per cent out-reflection and 12 per cent in-reflection. It has a solar energy transmission of 14 per cent and out-reflection of 29 per cent. Additionally, it has a shading coefficient (SC) of 0.23.
CONSTRUCTION & MATERIALS During construction, a recycling regimen was adopted via segregation of materials, implemented on each floor with accessibility from circulation zones. Aluminium off-form casting was used for at least 23 typical tower levels to limit material wastage and the reuse of concrete moulds. Half of the materials used are of recycled content, with 30 per cent of regional material sourced no more than 500 kilometres away from the site. On average, 60 per cent of sub-structure, superstructure and internal construction materials were locally sourced, the remainder of the external finishes such as glass and aluminium cladding were imported from China.
PERFORMANCE i. Wall OTTV: 40.26 W/m² ii. Roof RTTV: 22.08 W/m² iii. BEI: 112.68 kWh/m²/yr iv. LEED Gold v. GBI Certified vi. Lighting Fixtures Lighting Load: 7 W/m² (gross floor area)
vii. Building air-conditioner system and equipment Fresh Air Exchange Rate: 9m³/hour/person; 1.08 m³/hour/m²; 106,248.672 m³/hour Energy efficiency of air-con chiller: Chilled water is supplied from district cooling plant
viii. Occupancy rate: 85 per cent and the total number of occupants is 2,000 ix. Building indoor environment: Indoor air quality setting: temperature: 23 degrees celcius (average); relative humidity (RH): 68%
ENERGY CONSUMPTION i. Peak demand (monthly): 921 kWh (Average Jan – Dec 2020) ii. Energy used (monthly): 363,771 kWh (Average Jan – Dec 2020) iii. Typical Load curve (weekdays, weekends): Energy efficiency index: air-conditioned area 112.68 kWh/m²/yr (based on 2,000 operational hours/yr)
iv. Energy consumption:
Electricity @ Building Energy Intensity (BEI): 112.68 kWh/m²/yr (based on 2,000 operational hours/yr)
ENERGY-SAVING METHODS & APPLICATIONS a) Scheduled programme
CELCOM HQ is integrated with a Building Management System (BMS) to monitor energy consumptions. The equipment linked with the BMS are the chilled water central plant, variable air volume AHU, constant air volume AHU, dedicated outdoor air system, fan coil unit, split air unit and fans. The listed equipment in the whole building run on a scheduled programme that was set up by the facility management together with the BMS contractor. This helps to reduce losses from human error.
b) Duty cycle programme The BMS runs on a duty cycle, based on run hours to ensure both duty and standby equipment are utilised equally. This reduces the need for frequent maintenance.
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c) Optimum start/stop programme The HVAC system are set to start at a slow ramp to prevent overstressing the plant equipment.
d) Power demand programme
The chilled water setpoint is modulated by the BMS to improve efficiency of the chiller, reducing energy consumption. When the building load is less than the designed condition, chilled water setpoint increases to lessen the work by compressor, which means the system consumes less energy. In CELCOM, the primary heat exchanger maintains target secondary side CHW supply temperature at 8.2 degrees Celsius, while the secondary heat exchanger modulates to maintain target differential pressure and reduce pump energy consumption.
Air Handling Unit (AHU) and Fan Coil Unit (FCU) control the supply air temperature and supply air pressure, and carbon dioxide levels. • AHU CHW valves modulate to maintain a supply air temperature setpoint that is reset based on VAV demand to reduce pump energy consumption.
• AHU fan modulates to maintain a supply air pressure setpoint that is reset based on VAV demand to reduce fan energy consumption.
• AHU Fresh Air Damper modulates to maintain minimum fresh air supply while ensuring CO2 levels do not exceed 1,000ppm. This reduces energy while ensuring indoor air quality maintained.
Airflow controls the VAV Dampers modulate to maintain temperature setpoints, and consumption while ensuring Indoor air quality is maintained.
PROJECT DATA Project Name
Celcom Headquarters Location
Petaling Jaya, Selangor Darul Ehsan, Malaysia
Completion Date 19 February 2018 Site Area 2.06 acres Gross Floor Area 98,378 square metres Number of Rooms 288
Building Height 148 metres
Client/Owner Puncak Wangi Sdn Bhd Architecture Firm
Hijjas Kasturi Associates Sdn Bhd Principal Architect Muhamad Aris Bin Abdullah Main Contractor MRCB Builders Sdn Bhd Mechanical & Electrical Engineer
Perunding Eagle Sdn Bhd Civil & Structural Engineer Jurutera Perunding Meinhardt Sdn Bhd
6 Roof view 7 Exterior view
FUTURARC 47
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