Page 113 - Towards A Sustainable Future 2024

Figure 3 compares the output power characteristics and the Figure 4 shows the standing air fans, Euroace EBF-Z3 Fans,
fan speed of the AHU fan that runs on an alternating current deployed at the SGH One Campus.
(AC)—following the Affinity Law of fans. As the frequency
is proportional to speed, i.e. rpm = 120f/p, reducing the
frequency to 40Hz, i.e. 80%, reduces the power output to
50%.

Picture 3 shows Wei Hao and RuiQi Picture 4 shows the VSD
installing the EBF-Z3 Fans at the SGH for AHU305, with the
Specialist Outpatient Clinic. frequency for its AHU
Fan reduced to 40 Hz.
Figure 3 Output power and fan speed characteristics of the
AHU fan.
A summary of electrical power and data calculations are
summarised below.
By reducing the frequency of alternating current supplied to
the 30kW fan motor driving the AHU to 40Hz using a variable Current setting Proposed
speed drive (VSD), we cut energy consumption by 50%. This AHU’s VSD EuropAce Air Purifying Bladeless
adjustment significantly enhances energy efficiency without Operation: 12 Fan (EBF Z3) x 4
compromising the operational effectiveness of the AHU. hours Operation: 12 hours
Frequency: 50Hz Power: 35w
Each EuroAce EBF-Z3 energy-efficient fan consumes 35W Speed: 1500rpm
of electrical power, a fraction of the energy required by
the AHU’s 30kW fan. These energy-efficient fans mitigate
potential CO2 and heat issues associated with fluctuations in
the AHU fan by circulating indoor air efficiently. In addition, AHU power/speed calculation after AHU’s VSD frequency
a SwitchBot and a 24-hour timer were used to ensure that reduced from 50Hz to 40Hz
each EBF-Z3 Fan was turned on and off automatically every
12 hours to save electrical power.

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