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Sdn. Bhd. · Kuala Lumpur Request a study

Reference case

A 40-storey mixed-use tower in Kuala Lumpur.

380 serviced-apartment keys above eight floors of office and retail. 55,000 m² gross floor area, central chilled-water plant, centralised hot water, eight traction lifts, 8,800 MWh of electricity a year on Medium Voltage General.

0 50 100 150 200 MWh RECOVERED PER YEAR Thermal recovery CONDENSER + GREYWATER 200 Lift regeneration 8 MACHINES 66 In-conduit hydro 4 TURBINE SETS 13
Recovered energy by pathway. Total 279 MWh/yr — 3.2% of the tower's electricity, and 206 tCO₂e at the Peninsular grid emission factor of 0.740 kgCO₂e/kWh. The distribution is the point: thermal recovery carries the volume, lift regeneration carries the timing.
ANNUAL OPERATING SAVING · REFERENCE TOWER RM 341,000 PER YEAR RM 241,000 Maximum demand avoided RM 93,000 Energy recovered RM 7,000 · time-of-use shifting 225 kW × RM89.27/kW/MONTH · 279 MWh × RM0.334/kWh · 180 MWh SHIFTED × 4.09 sen/kWh
Where the money actually comes from. Seventy per cent of the operating saving is demand charge the building never incurs. This is why HERS is sold as one integrated system rather than three separate retrofits — the recovery pathways make the storage worth installing, and the storage makes the recovery worth paying for.
Reference tower — annual performance summary
Pathway Mechanism MWh/yr tCO₂e/yr RM/yr
Thermal Condenser desuperheater for DHW; greywater pre-cooling of condenser return 20014866,800
Kinetic Four-quadrant regenerative drives on eight traction lifts 664922,000
Hydraulic Turbine-generators replacing PRV stations on potable, greywater and rainwater lines 13104,300
Storage & control 500 kWh BESS, peak shaving and time-of-use shifting — shifts energy, does not create it ——248,000
TotalIntegrated HERS package 279206341,000

How these numbers were produced

Every figure on this page is a design estimate for a defined reference building, not a measured result from an installed system. They are published so they can be checked.

  • Hydraulic output from P = ρgQHη at average design flow; 0.60 overall efficiency on potable downfeed, 0.55 on gravity drainage lines.
  • Lift regeneration at 30% of lift drive energy, within the 20–40% range reported for four-quadrant drives under intensive duty; lift energy taken as 10% of common-area consumption.
  • Thermal recovery assumes 70% of a 22 m³/day domestic hot water load at 29→55 °C is met by condenser heat, displacing electric resistance heating; chiller uplift at 2.5% for a 1.5 K reduction in condensing temperature.
  • Carbon at 0.740 kgCO₂e/kWh — Peninsular Malaysia grid emission factor, 2024 provisional, Suruhanjaya Tenaga.
  • Tariff at Medium Voltage General under RP4: energy 29.83 sen/kWh, capacity RM29.43/kW, network RM59.84/kW, AFA taken at 3.59 sen/kWh. AFA is reviewed monthly and will move.
  • Building energy intensity of 160 kWh/m²/yr and a 1,500 kW maximum demand are assumptions of the reference model. Real buildings differ by a wide margin, which is why the first stage of any engagement is measurement.