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KTU Institute Of Architecture And
Construction
Laboratory Of Building Thermal Physics
Renovation Effect on Building
Energy Perfornance Indicator
dr. Edmundas Monstvilas
RENOVATION EFFECT ON BUILDING ENERGY
PERFORMANCE INDICATOR

The estimation of possible energy saving measures is
included into the requirements The National Building
Code (NBC) Energy Performance Of Buildings.
Certification Of Buildings Energy Performance.

The building energy performance certification client is
given with certificate additionally the calculation results of
possible energy saving measures effect to the improvement
of the building energy performance. The special
calculation sub-section is included into The calculation
program, compiled to the NBC.
ENERGY PERFORMANCE
of 5 Stories, 3 Staircases 45 Apartment
Building
INPUT DATA :
 Heated area 2700 m2;
 Window area 15% from heated area;
 Ventilation natural;
 Domestic hot water supply from substation in
building with manual control;
 Temperature control in heating system is absent;
 Heat source: district heating (manual control).
Energy performance of 5 Stories, 3 Staircases 45 Apartment
Building, Existing state
SUM ENERGY CONSUMPTION IN BUILDING FOR 1M2 OF HEATED AREA
255,71
2,25
BUILDING CLASSIFICATION INDICATOR VALUE
E
BUILDING ENERGY PERFORMANCE CLASS
Air infiltration;
29,2
Thermal
bridges; 13,9
Walls; 63,7
Windows; 36,3
Ceiling over
crawl; 9,1
Roof; 21,8
If energy price is 0,15 Lt/kWh, average heating cost during the heating
season is 2,63 Lt/(m2.month.)
THE SAME BUILDING, CHANGED WINDOWS AND DOORS IN
ACCORDANCE WITH REQUIREMENTS OF 2006,
WALLS, ROOF AND CEILING OVER BASEMENT WITHOUT INSULATION
SUM ENERGY CONSUMPTION IN BUILDING FOR 1M2 OF HEATED
AREA
210,68
2,02
BUILDING CLASSIFICATION INDICATOR VALUE
E
BUILDING ENERGY PERFORMANCE CLASS
ThermalAir infiltration
bridges 13,9 4,7
Windows 23,2
Walls 63,7
Ceiling over
crawl 9,1
Roof 21,8
If energy price is 0,15 Lt/kWh, average heating cost during the heating
season is 2,06 Lt/(m2.month.)
THE SAME BUILDING,INSULATED WALLS AND ROOF
IN ACCORDANCE WITH REQUIREMENTS OF 2006,
UNCHANGED WINDOWS, CEILING OVER BASEMENT WITHOUT
INSULATION
SUM ENERGY CONSUMPTION IN BUILDING FOR 1M2 OF HEATED AREA
BUILDING CLASSIFICATION INDICATOR VALUE
165,65
1,58
BUILDING ENERGY PERFORMANCE CLASS
D
Walls 10
Air infiltration
29,2
Thermal
bridges 13,9
sienos
Roof 4,1
Ceiling over
crawl 9,1
Windows 36,3
If energy price is 0,15 Lt/kWh, average heating cost during the heating
season is 1,65 Lt/(m2.month.)
THE SAME BUILDING, IN ACCORDANCE WITH
REQUIREMENTS OF 2006
SUM ENERGY CONSUMPTION IN BUILDING FOR 1M2 OF HEATED AREA
BUILDING CLASSIFICATION INDICATOR VALUE
102,32
0,89
BUILDING ENERGY PERFORMANCE CLASS
B
Air infiltration
4,7
Thermal
bridges 3,9
Windows 23,2
Walls 10
Roof 4,1
Ceiling over
crawl 4,4
If energy price is 0,15 Lt/kWh, average heating cost during the heating
season is 0,71 Lt/(m2.month.)
Efficiency of energy saving measures at
implementation in big apartment buildings
with low energy performance
MEASURE WITH PARAMETERS IN ACCORDANCE
WITH RECENT REQUIREMENTS
Savings,
kWh/(m2. metai)
CHANGE OF WINDOWS
Energy savings due to improvement of thermal
insulation 36,3-23,2=13,1 kWh/(m2. year),
Energy saving due to air infiltration reduction
29,2-4,7 =24,5 kWh/(m2. year)
37,6
INSULATION OF WALLS AND ROOF
63,7+21,8-10-4,1=71,4 kWh/(m2. year)
71,4
INSULATION OF CEILING OVER BASEMENT
9,1-4,4=4,7 kWh/(m2. year)
4,7
SUM ENERGY CONSUMPTION IN BUILDING FOR 1M2 OF HEATED AREA
BEFORE IMPLEMENTATION 272,58 kWh/(m2.year)
ANALYSIS OF MOST POPULAR ENERGY SAVING
MEASURES IN MULTI-APARTMENT BUILDINGS

I-st building.

Walls and roof un-insulated.
Windows and doors old.
DHW supply from heat substation,
Temperature control in heating
systems is absent,
Heat supply from district heating
pipelines (manual control)




SUM ENERGY CONSUMPTION IN BUILDING
FOR 1M2 OF HEATED AREA, 255,71
kWh/(m2.year)
ANNUAL ENERGY CONSUMPTION FOR
HEATING FOR 1M2 OF HEATED AREA, 209,71
kWh/(m2.year)
IF ENERGY PRICE IS 0,15 LT/KWh, AVERAGE
HEATING COST DURING THE HEATING
SEASON IS 2,63 LT/(M2.MONTH.)
II-d
building.
Walls and roof un-insulated.
Windows and doors new.
DHW supply from heat sub-station
with automatic control,
temperature control in heating
systems for the whole building with
thermostatic valves on radiators and
outdoor (indoor) temperature
sensors,
heat supply from district heating
pipelines (automatic control)
SUM ENERGY CONSUMPTION IN BUILDING
FOR 1M2 OF HEATED AREA, 187,51
kWh/(m2.year)
ANNUAL ENERGY CONSUMPTION FOR
HEATING FOR 1M2 OF HEATED AREA,
145,46 kWh/(m2.year)
IF ENERGY PRICE IS 0,15 LT/KWh, AVERAGE
HEATING COST DURING THE HEATING
SEASON IS 1,82 LT/(M2.MONTH.)
THE SAME BUILDING, IN ACCORDANCE WITH
REQUIREMENTS OF 2006,
All Possible energy saving measures, Without heat pump
SUM ENERGY CONSUMPTION IN BUILDING FOR 1M2 OF HEATED AREA
85,71
BUILDING CLASSIFICATION INDICATOR VALUE
0,73
BUILDING ENERGY PERFORMANCE CLASS
Ventilation
24,04
B
Walls 10,03
Roof 4,1
Ceiling over
crawl 4,36
Thermal
bridges 3,88
Windows
17,41
If energy price is 0,15 Lt/kWh, average heating cost during the heating
season is 0,55 Lt/(m2.month.)
THE SAME BUILDING, IN ACCORDANCE WITH
REQUIREMENTS OF 2006,
All Possible energy saving measures, with heat pump
SUM ENERGY CONSUMPTION IN BUILDING FOR 1M2 OF HEATED AREA
85,71
BUILDING CLASSIFICATION INDICATOR VALUE
0,73
BUILDING ENERGY PERFORMANCE CLASS
B
Walls 10,03
Ventilation 24
Thermal
bridges 3,88
Roof 4,1
Ceiling over
basement
4,36
Windows
17,41
If energy price is 0,15 Lt/kWh, average heating cost during the heating
season is 0,50 Lt/(m2.month.)
Energy performance class and energy
consumption level in respect to applied energy
saving measures
E-2,25, Existing building, quality of 1192
255,71
E-2,02, Existing building, changed
windows and doors
D-1,58, Existing building, insulated roof
and walls
B-0,89, Middle quality building,
requirements of 2006
B-0,73, Ideal building, requirements of
2006
B-0,70, Heat pump and requirements of
2006
210,58
165,66
102,32
85,71
81,74
0
50
100
150
200
2
250
300
SUM ENERGY CONSUMPTION IN BUILDING FOR 1M OF HEATED AREA
COMPARISON OF THE ENERGY PERFORMACE INDICES
FOR FAMILY AND APARTMENT BUILDINGS
Under requirements of 2006
SUM ENERGY CONSUMPTION IN BUILDING
FOR 1M2 OF HEATED AREA
Air infiltration
30,5
166,31
Walls 25,7
Roof 17,4
BUILDING CLASSIFICATION INDICATOR
VALUE
Thermal
bridges 13,9
0,76
Floor on
ground 21,4
Windows 30,2
BUILDING ENERGY PERFORMANCE CLASS
B
Annual heat losses for 1m2 of envelope area 37,74 kWh/(m2.year).
If energy price 0,15 Lt/kWh, average heating cost during heating season 1,78 Lt/(m2.month.)
Apartment building, heated area: 2700 m2
Walls 10
SUM ENERGY CONSUMPTION IN
BUILDING FOR 1M2 OF HEATED AREA
102.32
BUILDING CLASSIFICATION INDICATOR
VALUE
0,89
BUILDING ENERGY PERFORMANCE
CLASS
Air infiltration
29,2
Thermal
bridges 13,9
sienos
Roof 4,1
Ceiling over
crawl 9,1
Windows 36,3
B
Annual heat losses for 1m2 of envelope area 37,74 kWh/(m2.year).
If energy price 0,15 Lt/kWh, average heating cost during heating season 1,78 Lt/(m2.month.)
ENERGY CONSUMPTION FOR HEATING IN
DEPENDENCE TO INDOOR TEMPERATURE
Apartment building of 2700 m2 heated area. Existing state. Energy
consumption for heating at different average indoor temperature
2
Apartment building of 2700 m heated area, built up to1992. New windows
and doors, U-value 1,6 . Energy consumption for heating at different
average indoor temperature
209,71
Existing state, average indoor temperature 20C
Average indoor
temperature 20C
164,68
183,85
Existing state, average indoor temperature 18C
Average indoor
temperature 18C
Existing state, average indoor temperature16C
Nerenovuotas pastatas, average indoor temperature
14C
158,00
Insulated roof and w alls, average indoor temperature
20C
0,00
Average indoor
temperature 16C
132,15
Changed w indow s and doors, vidutinė patalpų
temperatūra žiemą 20C
143,76
122,85
Average indoor
temperature 14C
164,68
0,00
101,94
20,00
40,00
60,00
80,00
100,00 120,00 140,00 160,00 180,00
Energy consumption for heating, kWh/(m2. year)
119,66
50,00
100,00
150,00
200,00
250,00
Energy consumption for heating, kWh/(m2. year)
Real energy savings are closely
related to the indoor climate
conditions before renovation.
Apartment building of 2700 m2 heated area, built up to1992. Insulated roof
and walls. Energy consumption for heating at different average indoor
temperature
Average indoor
temperature 20C
119,66
Average indoor
temperature 18C
103,09
Average indoor
temperature 16C
86,52
Average indoor
temperature 14C
The values indicated in the certificate
as energy savings may be not
achieved after the implementation.
0,00
69,95
20,00
40,00
60,00
80,00
100,00
2
Energy consumption for heating, kWh/(m . year)
120,00
140,00
ENERGY CONSUMPTION FOR HEATING IN
DEPENDENCE TO INDOOR TEMPERATURE
Apartment building of 2700 m2 heated area. Energy
consumption for heating at different average indoor temperature
New windows
and doors
20C / 20C
Existing state /
45,03
18C / 20C
19,18
16C / 20C
6,68-
14C / 20C
32,53-
20C / 18C
65,94
18C / 18C
40,09
16C / 18C
14,24
14C / 18C
11,62-
20C / 16C
86,86
18C / 16C
61,00
16C / 16C
35,15
14C / 16C
9,30
20C / 14C
107,77
18C / 14C
81,92
16C / 14C
56,06
14C / 14C
30,21
-40
-20
0
20
40
2
60
Saved energy, kWh/(m . year)
80
100
120
ENERGY CONSUMPTION FOR HEATING IN
DEPENDENCE TO INDOOR TEMPERATURE
Apartment building of 2700 m2 heated area. Energy
consumption for heating at different average indoor temperature
Existing state /
Insulated roof
and walls
20C / 20C
90,04
18C / 20C
64,19
16C / 20C
38,34
14C / 20C 12,48
20C / 18C
106,61
18C / 18C
80,76
16C / 18C
54,91
14C / 18C
29,05
20C / 16C
123,18
18C / 16C
97,33
16C / 16C
71,48
14C / 16C
45,62
20C / 14C
139,75
18C / 14C
113,90
16C / 14C
88,05
14C / 14C
62,19
0
20
40
60
80
100
Saved energy, kWh/(m2. year)
120
140
160
ENERGY PERFORMANCE CLASS AND ENERGY
CONSUMPTION LEVEL
Better
insulation of roof and walls in big apartment
buildings provides significant energy savings, as well as
energy performance indicator value growth up by the
class.
Impact of better windows and door in energy
performance is less significant, in most of cases this
measure do not change the energy performance class of
the building, both for family houses or apartment
buildings.
 The designers and investors shall be immediately
introduced to the energy performance certification and
the impact of various energy saving measures on energy
consumption.
Thanks for attention !