Renovation Effect on Building Energy Perfornance Indicator

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Renovation Effect on Building Energy Perfornance
Indicator
KTU Institute Of Architecture And
Construction Laboratory Of Building Thermal
Physics
dr. Edmundas Monstvilas
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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.

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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).

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Energy performance of 5 Stories, 3 Staircases 45
Apartment Building, Existing state
If energy price is 0,15 Lt/kWh, average heating
cost during the heating season is 2,63
Lt/(m2.month.)
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THE SAME BUILDING, CHANGED WINDOWS AND DOORS IN
ACCORDANCE WITH REQUIREMENTS OF 2006, WALLS,
ROOF AND CEILING OVER BASEMENT WITHOUT INSULATION
If energy price is 0,15 Lt/kWh, average heating
cost during the heating season is 2,06
Lt/(m2.month.)
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THE SAME BUILDING,INSULATED WALLS AND ROOFIN
ACCORDANCE WITH REQUIREMENTS OF 2006, UNCHANGED
WINDOWS, CEILING OVER BASEMENT WITHOUT INSULATION
If energy price is 0,15 Lt/kWh, average heating
cost during the heating season is 1,65
Lt/(m2.month.)
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THE SAME BUILDING, IN ACCORDANCE WITH
REQUIREMENTS OF 2006
If energy price is 0,15 Lt/kWh, average heating
cost during the heating season is 0,71
Lt/(m2.month.)
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Efficiency of energy saving measures at
implementation in big apartment buildingswith
low energy performance
SUM ENERGY CONSUMPTION IN BUILDING FOR 1M2 OF
HEATED AREA BEFORE IMPLEMENTATION 272,58
kWh/(m2.year)
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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 sub-station,
• Temperature control in heating systems is absent,
  
• Heat supply from district heating pipelines
  (manual control)

• 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)

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THE SAME BUILDING, IN ACCORDANCE WITH
REQUIREMENTS OF 2006, All Possible energy saving
measures, Without heat pump
If energy price is 0,15 Lt/kWh, average heating
cost during the heating season is 0,55
Lt/(m2.month.)
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THE SAME BUILDING, IN ACCORDANCE WITH
REQUIREMENTS OF 2006, All Possible energy saving
measures, with heat pump
If energy price is 0,15 Lt/kWh, average heating
cost during the heating season is 0,50
Lt/(m2.month.)
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Energy performance class and energy consumption
level in respect to applied energy saving
measures
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COMPARISON OF THE ENERGY PERFORMACE INDICES FOR
FAMILY AND APARTMENT BUILDINGSUnder requirements
of 2006
Family house, heated area 175 m2
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
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.)
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ENERGY CONSUMPTION FOR HEATING IN DEPENDENCE TO
INDOOR TEMPERATURE
Real energy savings are closely related to the
indoor climate conditions before renovation. The
values indicated in the certificate as energy
savings may be not achieved after the
implementation.
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ENERGY CONSUMPTION FOR HEATING IN DEPENDENCE TO
INDOOR TEMPERATURE
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ENERGY CONSUMPTION FOR HEATING IN DEPENDENCE TO
INDOOR TEMPERATURE
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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 !