Building Energy Efficiecny

As we know buildings in Hong Kong account for a significant amount of energy consumption. According to Hong Kong's Electrical and Mechanical Service Department's (EMSD) study, over 90% of electricity is consumed by buildings.

In 2012, the Hong Kong SAR government enacted the Building Energy Efficiency Ordinance (BEEO) to enhance building energy efficiency and reduce greenhouse gas emissions. We have prepared some references on the concept of energy saving and how to achieve those goals:

Example of energy saving using inverter control
  • As the speed of the fan or pump is reduced, the flow will reduce proportionally, while the power required by the fan or the pump will reduce with the cube of the speed. This level of potential energy saving makes the use of Variable Speed Drive (VSD) a cost-effective investments in energy efficiency which can be considered for motors.

  • [Energy saving effect and amount of CO2 reduction by inverter drive]
    - Capacity of fan, pump: 30kW
    - Control speed by inverters: 60%

    * Efficiency of fan, pump at 100% operation: 92%

    * Necessary power of damper control: (60% speed = 84% power)
        30kW / 0.92 x 0.84 x 24h x 365days = 239,948kWh

    * Necessary power of inverter control: (60% speed = 21% power)
        30kW / 0.92 x 0.21 x 24h x 365days = 59,987kWh

    * Energy saving effect
        239,948?- 59,987 = 179,961kWh

    * Amount of CO2 reduction
        0.555kg / kWh x 179,961kWh = 99,878kg/year

Application samples
Toshiba Inverter Supporting the social infrastructure systems and industrial systems.

Energy Savings Estimator Program
  • Try using this software program to estimate the electrical engeryfor fan and pump applications when using an AC motor in combination with an inverter drive. The software compares the use of an inverter drive against conventional control methods such as outlet dampers, inlet vanes, throttling valves, etc.... and instantly see the benefits.




© 2019 Sunnice Supplies Co., Ltd all rights reserved.