Page 215 - Towards A Sustainable Future , Phase 3 2025, E-Book_Neat

The graph above highlights the device's operational hours • Water Dispenser on Level 2
outside the standard working hours. This equates to an
additional 8 hours daily on weekdays (including a 30-minute
preheating period) and a total of 30 hours over the weekend.
To assess the impact of this extended operation, we calculated
the device's energy consumption during these hours and the
potential savings achievable by eliminating or reducing this
excess usage.

Energy Consumption Calculation:
Given that the device consumes 2.5 at a voltage of 230V, the
energy consumption per hour is: Figure 7. Data monitored for water dispenser level 2
kWh/hour=(2.5×230×1)/1000 = 0.575 kWh
For 1 week:
kWh(Weekdays) = 0.575 kWh x 8 hours x 5 days =23kWh The graph above highlights the device's operational hours
kWh(Weekends) = 0.575 kWh x 15 hours x 2 days =17.25kWh outside the standard working hours. This equates to an
Total per week = 23kWh + 17.25 kWh = 40.25kWh additional 8 hours daily on weekdays (including a 30-minute
For 1 Year: preheating period) and a total of 30 hours over the weekend.
Total kWh/year = 40.25kWh x 52 weeks = 2093 kWh To assess the impact of this extended operation, we calculated
the device's energy consumption during these hours and the
Percentage Reduction: potential savings achievable by eliminating or reducing this
Assuming the device operates for 15 hours (based on the data excess usage.
above), 7 days a week, its total annual energy consumption is:
Energy Consumption Calculation:
Total kWh/year= 0.575 kWh x 15 hours per day x 365 days Given that the device consumes 2.7 at a voltage of 230V, the
= 3148.125 kWh energy consumption per hour is:
kWh/hour=(2.7×230×1)/1000 = 0.621 kWh
If the 8 excess hours on weekdays and 15 excess hours on For 1 week:
weekends were eliminated, the annual energy savings would kWh(Weekdays) = 0.621 kWh x 8 hours x 5 days =24.84kWh
be: kWh(Weekends) = 0.621 kWh x 15 hours x 2 days =18.63 kWh
Reduction (%) = 2093k Wh / 3148.125 kWh = 66% Total per week = 24.84 kWh + 18.63 kWh = 43.47 kWh
For 1 Year:
By eliminating the extra 8 additional hours daily on weekdays Total kWh/year = 43.47kWh x 52 weeks = 2260.44kWh
and 30 hours over the weekend, the device could save Percentage Reduction:
approximately 2093 kWh annually, resulting in a 66 % reduction
in energy consumption. This emphasises the importance of Assuming the device operates for 15 hours (based on the data
optimising operational hours for better energy efficiency and above), 7 days a week, its total annual energy consumption is:
cost savings.
Total kWh/year= 0.621 kWh x 15 hours per day x 365 days
= 3399.975kWh

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