oThe European Alliance of Companies for Energy Efficiency in Buildings
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Overview

Assessing the Situation
• Current potential *
• Wider benefits

Finding a Way Forward
• Opportunities and barriers
• Case studies
• Recommendations

Downloads

Index of links

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High-Rise project >> Assessing the Situation > Current potential >

Refurbishment measures Results      
• For each base building Overall            

Warm climate EU15 countries (base building A)

Headline facts and figures

• Broadly representative of France, Greece, Italy, Portugal and Spain
• 19.5 million dwellings
• 650,000 buildings (theoretical)
• 24% of dwellings in the region
• Energy-saving potential in stock: 25%, equivalent to 1.3% of region’s final energy demand or 10 MtCO2 emissions

Predominant construction and heating features

• In situ concrete walls, flat concrete roof and concrete floor, single-glazed, metal frame windows
• Dwelling based electric systems or appliances

Cost effectiveness of energy efficiency investment

Energy savings, investment costs and cost of conserved energy

 

U-value before

U-value after

Energy saved [kWh/m2a]

Annual investment cost [€/m2a]

Cost of conserved energy [€cent/kWh]

Simple payback [a]

Walls

2.37

0.46

66.6

35.7%

1.32

2.0

2.8

Roof

3.00

0.39

22.5

12.1%

0.17

0.8

1.1

Floor

2.93

0.47

21.3

11.4%

0.18

0.9

1.2

Windows

4.56

2.64

22.2

11.9%

0.93

4.2

5.8

Package

2.93

0.85

132.6

71.0%

2.61

2.0

2.7

Energy savings, costs of energy and of CO2 mitigation

 

Energy saved [kWh/m2a]

Cost of supplied energy [€cent/kWh]

Cost of conserved energy [€cent/kWh]

Net cost of conserved energy [€cent/kWh]

Cost of CO2 mitigation [€/tCO2]

Net cost of CO2 mitigation [€/tCO2]

Walls

66.6

35.7%

12.4

2.0

-10.4

95

-496

Roof

22.5

12.1%

0.8

-11.6

36

-554

Floor

21.3

11.4%

0.9

-11.6

40

-550

Windows

22.2

11.9%

4.2

-8.2

199

-391

Package

132.6

71.0%

12.4

2.0

-10.4

93

-497

Issues

• Second lowest heating demand region.
• France is a borderline case between a warm and a moderate climate country. As a result the characteristics of its high-rise building stock can be expected to vary widely, but it has been categorised as warm climate because it is believed the majority of its high-rise stock is in the southern regions.
• The cost-effectiveness of RUE investment in this region appears to be amongst the best. This is due to the low initial thermal quality of a refurbishable building, the relatively low investment cost and higher-priced energy carriers. But the difference between theoretical heating demand based on heating degree days and actual energy used for heating is likely to be large because temperatures don’t drop as far, nor as quickly as in colder climes.
 

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T: +32 (0)2 639 10 10 F: +32 (0)2 639 10 15 E: info at euroace dot org

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