KTU Institute Of Architecture And Construction Laboratory Of

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 Ø 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. Ø 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 : Ø Heated area 2700 m 2; Ø Window area 15% from heated area; Ø Ventilation natural; Ø Domestic hot water supply from substation in building with manual control; Ø Temperature control in heating system is absent; Ø Heat source: district heating (manual control).

Energy performance of 5 Stories, 3 Staircases 45 Apartment Building, Existing state SUM ENERGY CONSUMPTION IN BUILDING FOR 1 M 2 OF HEATED AREA BUILDING CLASSIFICATION INDICATOR VALUE BUILDING ENERGY PERFORMANCE CLASS 255, 71 2, 25 E If energy price is 0, 15 Lt/k. Wh, average heating cost during the heating season is 2, 63 Lt/(m 2. 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 1 M 2 OF HEATED AREA BUILDING CLASSIFICATION INDICATOR VALUE BUILDING ENERGY PERFORMANCE CLASS 210, 68 2, 02 E If energy price is 0, 15 Lt/k. Wh, average heating cost during the heating season is 2, 06 Lt/(m 2. 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 1 M 2 OF HEATED AREA BUILDING CLASSIFICATION INDICATOR VALUE BUILDING ENERGY PERFORMANCE CLASS 165, 65 1, 58 D If energy price is 0, 15 Lt/k. Wh, average heating cost during the heating season is 1, 65 Lt/(m 2. month. )

THE SAME BUILDING, IN ACCORDANCE WITH REQUIREMENTS OF 2006 SUM ENERGY CONSUMPTION IN BUILDING FOR 1 M 2 OF HEATED AREA BUILDING CLASSIFICATION INDICATOR VALUE BUILDING ENERGY PERFORMANCE CLASS 102, 32 0, 89 B If energy price is 0, 15 Lt/k. Wh, average heating cost during the heating season is 0, 71 Lt/(m 2. 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, k. Wh/(m 2. metai) CHANGE OF WINDOWS Energy savings due to improvement of thermal insulation 36, 3 -23, 2=13, 1 k. Wh/(m 2. year), Energy saving due to air infiltration reduction 29, 2 -4, 7 =24, 5 k. Wh/(m 2. year) 37, 6 INSULATION OF WALLS AND ROOF 63, 7+21, 8 -10 -4, 1=71, 4 k. Wh/(m 2. year) 71, 4 INSULATION OF CEILING OVER BASEMENT 9, 1 -4, 4=4, 7 k. Wh/(m 2. year) 4, 7 SUM ENERGY CONSUMPTION IN BUILDING FOR 1 M 2 OF HEATED AREA BEFORE IMPLEMENTATION 272, 58 k. Wh/(m 2. year)

ANALYSIS OF MOST POPULAR ENERGY SAVING MEASURES IN MULTI-APARTMENT BUILDINGS Ø I-st building. Walls and roof un-insulated. Windows and doors old. DHW supply from heat substation, Ø Temperature control in heating systems is absent, Ø Heat supply from district heating pipelines (manual control) Ø ØII-d building. ØWalls and roof un-insulated. ØWindows and doors new. ØDHW supply from heat sub-station with automatic control, Øtemperature control in heating systems for the whole building with thermostatic valves on radiators and outdoor (indoor) temperature sensors, Øheat supply from district heating pipelines (automatic control) SUM ENERGY CONSUMPTION IN BUILDING FOR 1 M 2 OF HEATED AREA, 255, 71 k. Wh/(m 2. year) ANNUAL ENERGY CONSUMPTION FOR HEATING FOR 1 M 2 OF HEATED AREA, 209, 71 k. Wh/(m 2. year) IF ENERGY PRICE IS 0, 15 LT/KWh, AVERAGE HEATING COST DURING THE HEATING SEASON IS 2, 63 LT/(M 2. MONTH. ) SUM ENERGY CONSUMPTION IN BUILDING FOR 1 M 2 OF HEATED AREA, 187, 51 k. Wh/(m 2. year) ANNUAL ENERGY CONSUMPTION FOR HEATING FOR 1 M 2 OF HEATED AREA, 145, 46 k. Wh/(m 2. year) IF ENERGY PRICE IS 0, 15 LT/KWh, AVERAGE HEATING COST DURING THE HEATING SEASON IS 1, 82 LT/(M 2. MONTH. )

THE SAME BUILDING, IN ACCORDANCE WITH REQUIREMENTS OF 2006, All Possible energy saving measures, Without heat pump SUM ENERGY CONSUMPTION IN BUILDING FOR 1 M 2 OF HEATED AREA 85, 71 BUILDING CLASSIFICATION INDICATOR VALUE 0, 73 BUILDING ENERGY PERFORMANCE CLASS B If energy price is 0, 15 Lt/k. Wh, average heating cost during the heating season is 0, 55 Lt/(m 2. month. )

THE SAME BUILDING, IN ACCORDANCE WITH REQUIREMENTS OF 2006, All Possible energy saving measures, with heat pump SUM ENERGY CONSUMPTION IN BUILDING FOR 1 M 2 OF HEATED AREA 85, 71 BUILDING CLASSIFICATION INDICATOR VALUE 0, 73 BUILDING ENERGY PERFORMANCE CLASS B If energy price is 0, 15 Lt/k. Wh, average heating cost during the heating season is 0, 50 Lt/(m 2. month. )

Energy performance class and energy consumption level in respect to applied energy saving measures

COMPARISON OF THE ENERGY PERFORMACE INDICES FOR FAMILY AND APARTMENT BUILDINGS Under requirements of 2006 Family house, heated area: 175 m 2 SUM ENERGY CONSUMPTION IN BUILDING FOR 1 M 2 OF HEATED AREA 166, 31 BUILDING CLASSIFICATION INDICATOR VALUE BUILDING ENERGY PERFORMANCE CLASS 0, 76 B Annual heat losses for 1 m 2 of envelope area 37, 74 k. Wh/(m 2. year). If energy price 0, 15 Lt/k. Wh, average heating cost during heating season 1, 78 Lt/(m 2. month. ) Apartment building, heated area: 2700 m 2 SUM ENERGY CONSUMPTION IN BUILDING FOR 1 M 2 OF HEATED AREA 102. 32 BUILDING CLASSIFICATION INDICATOR VALUE 0, 89 BUILDING ENERGY PERFORMANCE CLASS B Annual heat losses for 1 m 2 of envelope area 37, 74 k. Wh/(m 2. year). If energy price 0, 15 Lt/k. Wh, average heating cost during heating season 1, 78 Lt/(m 2. month. )

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.

ENERGY CONSUMPTION FOR HEATING IN DEPENDENCE TO INDOOR TEMPERATURE

ENERGY PERFORMANCE CLASS AND ENERGY CONSUMPTION LEVEL ØBetter 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. ØImpact 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. Ø 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 !