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            

Moderate climate EU15 countries (base building D)

Headline facts and figures

• Broadly representative of the Belgium, Ireland, Luxembourg, the Netherlands and the United Kingdom
• 1.2 million dwellings
• 38,000 buildings (theoretical)
• 6.4% of dwellings in the region
• Energy-saving potential in stock: 30%, equivalent to 0.5% of region’s final energy demand or 5.3 MtCO2 emissions

Predominant construction and heating features

• Prefabricated concrete panel walls, flat concrete roof and concrete floor over unheated basement, double-glazed, wood frame windows
• Building-based gas central heating, allowing installation of TRVs and balancing valves and replacement of existing boiler with condensing boiler

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

1.61

0.46

77.7

32.7%

1.70

2.2

4.3

Roof

1.46

0.27

17.2

7.3%

0.26

1.5

3.0

Floor

1.79

0.51

18.4

7.8%

0.18

1.0

2.0

Windows

3.38

1.77

39.2

16.5%

1.56

4.0

7.8

Package

1.97

0.71

152.6

64.2%

3.70

2.4

4.8

TRVs

71.3

30.0%

0.24

0.3

0.8

All of the above combined

178.1

74.9%

3.94

2.2

4.5

+ boiler replacement

191.2

80.5%

3.99

1.9

4.0

DHW effect

17.3

22.1%

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

77.7

32.7%

8.8

2.2

-6.6

95

-287

Roof

17.2

7.3%

1.5

-7.3

65

-317

Floor

18.4

7.8%

1.0

-7.8

43

-340

Windows

39.2

16.5%

4.0

-4.8

174

-209

Package

152.6

64.2%

8.8

2.4

-6.3

106

-277

TRVs

71.3

30.0%

0.3

-5.5

15

-240

All above

178.1

74.9%

2.2

-6.1

97

-268

+ boiler

191.2

80.5%

8.8

1.9

-6.2

84

-271

DHW effect

17.3

22.1%

Issues

• Lowest dwellings proportion. High heterogeneity (between and within countries), both in terms construction type and heating system type. Ireland has mainly dwelling-based electric heating.
• The cost-effectiveness of measures for Ireland, because of the use of electricity as the main heating energy carrier, is higher than the figures in the data table for the region as a whole suggest.
 

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