Page 89 - Towards A Sustainable Future 2024

The team’s proposal included installing three sets of
PIR sensors positioned at different locations within the
warehouse to gather representative usage data. Before
implementing the solution, warehouse lighting was
continuously activated for 24 hours. Post-implementation,
the lights were activated based on sensor detection, with
each light remaining illuminated for 15 minutes upon
activation. Four sensors were strategically installed to cover
the entirety of the warehouse, comprising three individual
rooms. Under the new system, lights are exclusively activated
when staff members enter the warehouse, specifically at
level 8. A circuit diagram of the PIR system is shown in Figure
3a and 3b. Figure 3b: Circuit diagram and simulation of the PIR
system.
Before proposing the solution to ForeFront Medical, the
team tested the PIR prototype on the ITE campus.

• Cost of implementation (Warehouse): $1,410(approx.) for
three sets.

• Potential Carbon Saving(Extrapolated): 60% (Warehouse
environment).
The average daily usage of lighting with the PIR system
amounts to 1.5 hours. The estimated annual power usage
after implementation of eco-solution 1 is shown in Table 5.
Figure 3a: Circuit diagram

Table 5: Estimated annual power consumption and CO2 equivalent of lighting after
installation of PIR system, eco-solution 1.

Total savings: $559.10 - $34.94 = $524.16. Equivalent CO2 Emission reduction: 2430.89 – 151.93
= 2278.96 Kg/ CO2/yr.

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