Page 17 - Towards A Sustainable Future , Phase 3 2025, E-Book_Neat

Presentation of Data
Data collected on gym usage indicates that the average Furthermore, the gym achieves yearly cost savings of
user spends approximately 30 minutes on a cardio machine. $43, based on an electricity cost of $0.291 per kWh. The
Exercise durations vary, with warm-ups lasting between 5 and implementation of the spin bikes results in a 100% reduction
15 minutes and full cardio workouts extending up to an hour. in reliance on non-renewable energy sources for the
The energy-generating spin bike demonstrates the potential electricity generated by the bikes. This initiative showcases
to produce one watt-hour (Wh) of electricity every 3 to 5 the combined environmental and financial advantages of
minutes when the user maintains a pedalling power. adopting renewable energy solutions in fitness facilities.

A single spin bike is capable of generating one watt-hour Table 2 provides a detailed cost breakdown for the design
(Wh) of electricity every 3 to 5 minutes. Assuming an average and installation of the exercise bike power generation system,
duration of 4 minutes per Wh, the energy output equates to: including components such as the battery cell, phone charger,
and power meter. The total cost for implementing this eco-
Energy generation rate = (60 ÷ 4) × 1 = 15 Wh per hour. solution is $1,100.00.

If an average gym user utilises the spin bike for 30 minutes
per session, the energy generated per user per session is
calculated as:

Wh per session = (30 ÷ 4) × 1 = 7.5 Wh.

The gym operates with three spin bikes, and the average daily Table 1: Energy Generation, CO₂ Emissions Reduction, and Cost
Savings Achieved Through the Use of Energy-Generating Spin
usage is approximately 55 users across all bikes. The total Bikes.
energy generated daily is:

Daily energy output = 7.5 × 55 = 412.5 Wh.

Assuming the gym operates every day over a 30-day month,
the total energy generated in a year is:

Annual energy output = 412.5 × 365 = 150,562.5 Wh Table 2. Cost Breakdown for Eco-Solution
or 150.563 kWh
Eco-solution 2
Table 1 illustrates the projected impact of implementing Singapore's high density and focus on sustainability make
energy-generating spin bikes in a gym, comparing the baseline it an ideal location to pilot energy-harvesting and resource-
scenario ("Before") with the outcomes after the bikes have repurposing initiatives. Retrofitting spin bikes with energy-
been introduced ("After"). The gym generates an additional harvesting technology and promoting their reuse not only
150 kWh of electricity annually, which was previously zero. aligns with Singapore's Green Plan 2030 but also demonstrates
This initiative also leads to an annual reduction of 60.02 kg a tangible commitment to a circular economy. The
of CO₂ emissions, calculated using a conversion factor of environmental and economic benefits include reducing landfill
0.4057 kgCO₂/kWh, highlighting its environmental benefits. contributions from discarded gym equipment, minimising

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