Industry
Real life example (Business name omitted for confidentiality)
Type of demand
Heating + Hot water + Electricity
Hot water demand
10,000 Liters per day
Electricity demand
200,000 kWh/year
Existing System
Gas boiler
Location
Brussels, Belgium
Gas price
EUR 0.15/kWh
Electricity price
EUR 0.20/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
121
39
Heat pump
60
Cost savings
61
28
Heat pump
80
CO2 savings
121
39
Heat pump
90
Solution details
Thermal capacity
(kWp)
Electrical capacity
(kWp)
Auxiliary system
Auxiliary system capacity (kWp)
Roof use / Energy savings
121
39
Heat pump
60
Thermal capacity
(kWp)
Electrical capacity
(kWp)
Auxiliary system
Auxiliary system capacity (kWp)
Cost savings
61
28
Existing system
80
Thermal capacity
(kWp)
Electrical capacity
(kWp)
Auxiliary system
Auxiliary system capacity (kWp)
CO2 savings
121
39
Heat pump
90
Solution details
Roof use / Energy savings
| Thermal capacity (kWp) | 121 |
| Solar Electrical capacity (kWp) | 39 |
| Auxiliary system | Heat pump |
| Auxiliary system capacity (kWp) | 60 |
Cost savings
| Thermal capacity (kWp) | 61 |
| Solar Electrical capacity (kWp) | 28 |
| Auxiliary system | Existing system |
| Auxiliary system capacity (kWp) | 80 |
CO2 savings
| Thermal capacity (kWp) | 121 |
| Solar Electrical capacity (kWp) | 39 |
| Auxiliary system | Heat pump |
| Auxiliary system capacity (kWp) | 90 |
Roof use optimization favors PVT panels and heat pumps because PVT panels generate the most energy per square meter.
Cost optimization favors PV+T+HP solution because it has the lowest CAPEX.
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
310%
48%
60%
1,092,501
643
Cost savings
476%
41%
54.38%
918,918
321
CO2 savings
280%
49%
61%
1,085,977
643
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
310%
48%
60%
1,092,501
643
Return on investment (ROI)
Renewable energy share (%)
CO2 Savings (%)
Total cost savings over life-span (EUR)
Total energy delivered (kWh/m2)
Cost savings
476%
41%
54.38%
918,918
321
Return on investment (ROI)
Renewable energy share (%)
CO2 Savings (%)
Total cost savings over life-span (EUR)
Total energy delivered (kWh/m2)
CO2 savings
280%
49%
61%
1,085,977
643
KPI’s
Roof use / Energy savings
| Return on investment (ROI) | 310% |
| Renewable energy share (%) | 48% |
| CO2 Savings (%) | 60% |
| Total cost savings over life-span (EUR) | 1,092,501 |
| Total energy delivered (kWh/m2) | 643 |
Cost savings
| Return on investment (ROI) | 476% |
| Renewable energy share (%) | 41% |
| CO2 Savings (%) | 54.38% |
| Total cost savings over life-span (EUR) | 918,918 |
| Total energy delivered (kWh/m2) | 321 |
CO2 savings
| Return on investment (ROI) | 280% |
| Renewable energy share (%) | 49% |
| CO2 Savings (%) | 61% |
| Total cost savings over life-span (EUR) | 1,085,977 |
| Total energy delivered (kWh/m2) | 643 |
Business users can choose their preferred energy solution which matches their environmental, economic and efficiency requirements.
In this example, the business user opted for the cost optimization solution, as it provided the highest ROI with a comparable share of renewable energy sources and CO2 savings vis-a-vis other options.
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 Accommodations
Accommodations
LInk naar:Case study Food industry
Food industry
LInk naar:Case study Other buildings
Other buildings
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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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