Analysis | Discussion of results and evaluation |
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According to the energy performance of the building, the demand for usable energy for heating and ventilation developed for this project was calculated at 1.41 kWh/m2 [ |
The criterion of warmth demand for heating ≤ 15 kWh/m2a or thermal load of the building ≤ 10 W/m2 was met. |
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According to the energy performance of the building, primary energy was calculated at 165.86 kWh/m2 year. The increase in the value of this criterion was influenced by the decision to use the air-conditioning in the facility. | The admissible value of primary energy for the building has been exceeded. The criterion assumes primary energy demand of ≤ 120 kWh/m2a |
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Tightness of the building in accordance with the construction project was established at the level of 0.6 / h. After commissioning the facility, an air tightness test was carried out in accordance with PN-EN 13829. The test showed that the air exchange rate is n50 = 0.39 h-1 [ |
The Blower-Door-Test leak study showed much better results than the required building integrity n50 < = 0.6 h-1. |
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A special freestanding frames for external blinds has been used. Blinds protect the kindergarten from overheating. A cooling system was designed to eliminate the possibility of excessive temperatures, which increased the demand for primary energy in the building. | No measurements or calculations have been made regarding the frequency of excessive temperature. Both shading and air conditioning were used. The use of air conditioning will not allow rooms to overheat. The criterion of the occurrence of excessive temperatures 10% has been met. However, it has not been achieved in a passive way, and in an active way, i.e. using air conditioning, which increased the demand for primary energy. |
Analysis | Discussion of results and evaluation |
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Location of the object relative to the sides of the world, heat gains from solar energy [ north-west is 0.87 at the glazing area of 15.99 m2; north-eastern 0.94 at the glazing area of 9.03 m2, south-west 0.71 at 46.50 m2 of glazing area, south-eastern 0.84 at the glazing area of 14.90 m2 |
The object was correctly located in relation to the sides of the world. The rooms were arranged in accordance with the rules of passive construction. Technical rooms from the north and east, rooms with large glazing from the south and west. The location of the rooms favourable to the sides of the world and the appropriate selection of the size of the window joinery made it possible to obtain solar profits and reduce heat losses [ |
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The object has been designed taking into account the following values of the parameters of the heat transfer coefficient through the partition U: floor on a foundation slab with XPS insulation (λ = 0.038 W/mK) with a thickness of 40 cm, has a U-value of 0.093 W/(m2K) external reinforced concrete walls, with mineral wool insulation (λ = 0.036 W/mK) 30 cm thick, has a U-value of 0.151 W/(m2K) reinforced concrete roof, with a mineral wool insulation (λ = 0.037 W/mK), 40 cm thick, has a U-value of 0.09 W/(m2K) |
All building compartments meet the requirement U ≤ 0.15 W/(m2K). |
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According to the project, the kindergarten’s air tightness was assumed to be 0.6 h-1. After commissioning the facility, an air tightness test was carried out in accordance with PN-EN 13829. The test showed that the air exchange rate is n50 = 0.39 h-1[ |
The Blower-Door-Test tightness test showed much better results than the required building air tightness n50 < = 0.6 h-1. |
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The object has windows with a coefficient of: from the north side on the level Ug = 0.5 W/(m2K), from the south side on the level Ug = 0.7 W/(m2K) |
Worse glass parameters were obtained due to the necessity of using fire and technical joinery in the building. |
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Continuous thermal insulation of the object was used, under the foundation slab, on the walls and roof. The attic of the main cause of thermal bridges has been abandoned. The building is simple and compact. Thermal bridges connected with overhanging, balconies, concave corners, etc. were excluded due to this. Window joinery was installed in the insulation layer creating a uniform insulation. A freestanding steel structure was used for the installation of the shutter. In this way, thermal bridges created during the installation of blinds in insulation were eliminated (Fig. |
The facility is efficient, with the elimination of most thermal bridges (Fig. |