Industry
Real life example (Business name omitted for confidentiality)
Type of demand
Hot water + Electricity
Number of occupants
128
Electricity demand
190,000 kWh/year
Existing System
Heat pump with electric boilers as backup
Location
Cape Town, South Africa
Heat price
R 1.5/kWh
Electricity price
R 2.5/kWh
Maximum panels on given roof
100
Solution details
Thermal capacity (kWp)
Solar Electrical capacity (kWp)
Auxiliary system
Auxiliary system capacity (kWp)
Roof use / Energy savings
137.2
38.0
Existing system
Cost savings
0
44.5
Existing system
CO2 savings
137.2
38.0
Existing system
Solution details
Thermal capacity
(kWp)
Electrical capacity
(kWp)
Auxiliary system
Roof use / Energy savings
137.2
38.0
Existing system
Thermal capacity
(kWp)
Electrical capacity
(kWp)
Auxiliary system
Cost savings
0
44.5
Existing system
Thermal capacity
(kWp)
Electrical capacity
(kWp)
Auxiliary system
CO2 savings
137.2
38.0
Existing system
Solution details
Roof use / Energy savings
| Thermal capacity (kWp) | 137.2 |
| Solar Electrical capacity (kWp) | 38.0 |
| Auxiliary system | Existing system |
Cost savings
| Thermal capacity (kWp) | 0 |
| Solar Electrical capacity (kWp) | 44.5 |
| Auxiliary system | Existing system |
CO2 savings
| Thermal capacity (kWp) | 137.2 |
| Solar Electrical capacity (kWp) | 38.0 |
| Auxiliary system | Existing system |
Roof use optimization favors PVT panels and heat pumps because PVT panels generate the most energy per square meter.
Cost optimization results in a PV and heat pump solution, as they have the lowest CAPEX and higher returns compared to other solutions, given that electricity prices are much higher than heat prices.
CO2 savings and roof use optimizations often yield similar results due to their closely related metrics.
KPI’s
Return on investment (ROI)
Renewable energy share (%)
CO2 Savings (%)
Total cost savings over life-span (EUR)
Total energy delivered (kWh/m2)
Roof use / Energy savings
393%
57%
47%
1,156,505
1203
Cost savings
621.6%
18%
28%
457,300
379
CO2 savings
393%
57%
47%
1,156,505
1203
KPI’s
Return on investment (ROI)
Renewable energy share (%)
CO2 Savings (%)
Total cost savings over life-span (EUR)
Total energy delivered (kWh/m2)
Roof use / Energy savings
393%
57%
47%
1,156,505
1203
Return on investment (ROI)
Renewable energy share (%)
CO2 Savings (%)
Total cost savings over life-span (EUR)
Total energy delivered (kWh/m2)
Cost savings
621.6%
18%
28%
457,300
379
Return on investment (ROI)
Renewable energy share (%)
CO2 Savings (%)
Total cost savings over life-span (EUR)
Total energy delivered (kWh/m2)
CO2 savings
393%
57%
47%
1,156,505
1203
KPI’s
Roof use / Energy savings
| Return on investment (ROI) | 393% |
| Renewable energy share (%) | 57% |
| CO2 Savings (%) | 47% |
| Total cost savings over life-span (EUR) | 1,156,505 |
| Total energy delivered (kWh/m2) | 1203 |
Cost savings
| Return on investment (ROI) | 621.6% |
| Renewable energy share (%) | 18% |
| CO2 Savings (%) | 28% |
| Total cost savings over life-span (EUR) | 457,300 |
| Total energy delivered (kWh/m2) | 379 |
CO2 savings
| Return on investment (ROI) | 393% |
| Renewable energy share (%) | 57% |
| CO2 Savings (%) | 47% |
| Total cost savings over life-span (EUR) | 1,156,505 |
| Total energy delivered (kWh/m2) | 1203 |
Business users can choose their preferred energy solution which matches their environmental, economic and efficiency requirements.
In this case, the business user chose CO2 savings to balance a favorable business case and maximizing energy generation from limited roof space while also achieving significant CO2 savings. Furthermore, the preferred solution also meets a considerable amount of savings.
Total Cost Savings: Net difference between the current energy system costs and costs from renewable energy sources after O&M costs over the system’s lifespan.
Return on Investment: (Total cost savings – Initial investment)/Initial investment)
Renewable Energy Share (RES): The percentage of total energy demand met by renewable sources e.g. heat and electricity.
CO2 Savings: Reduction in CO2 emissions due to renewable energy use.
Total Energy Delivered (kWh/m²): The amount of solar energy produced per square meter of useable/panel area.
Other case studies
LInk naar:Case study Food industry
Food industry
LInk naar:Case study Other buildings
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LInk naar:Case study Other industries
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Tess Broos
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Tess Broos
Renewable energy engineer with a MSc in Building Physics and Services.
tess@makt.tech
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