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Improving thermal and visual user comfort in very low energy buildings
Alexandra DANU Liviu Andrei NEGREAVladimir TANASIEVAdrian BADEAHoria NECULA
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Index
1. About Passive Houses
2. Passive House UPB: case study
3. HVAC system
4. Simulations
5. Measurements
6. Interior comfort
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About Passive Houses“Passivhaus” - energy-efficient standard for buildings
Passive house criteria :
• Specific space heating demand should not exceed 15 kWh/m2yr;
• Primary energy demand should not exceed 120 kWh/m2yr for all energy services (heating, cooling, hot water and electric appliances);
• Air exchange between the interior and the exterior of the building should not exceed 0.6 h-1 at a difference of 50 Pa.
Energy demand - 80% conventional buildings 75 % new buildings
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Passive House UPB: case study
Passive House, University Politehnica of Bucharest
• East Building – case study & laboratory research
• West Building– conferences
• W – geothermal HP• E - HVAC
• Occupancy – 40% living room , 3% kitchen
• U-value opaque elements 0.15 W/m2/K• U-value of the windows 0.6 W/m2/K
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Data acquisition and HVAC system
HVAC system
Earth-AirAir-Air
Electric air heater resitance of 2.4kW
Photovoltaic system of 3 kW
Data acquisition – Wire and wireless sensons
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Data acquisition and HVAC system
Wi-fi data acquisition
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Simulations and discussions
The variation of the energy demand and the indoor temperature for the Living room area with and without HVAC
system during one year
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Mesurements and discussions
Variation of inside average temperature in the passive house of UPB during one year
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Interior comfort
Evolution of the interior and exterior temperature on 22nd of
July 2014
Evolution of the HVAC temperatures on 22nd of July
2014
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Conclusions
• The purpose of simulations was to choose the right strategy for achieving thermal comfort with minimal energy consumption.
• Using the right amount of energy consumption for heating and ventilation, the house could be maintained in the winter in the imposed limits and consumed under 15 kWh/m2 . yr.
• Choosing the right scenario leads us to the desired interior comfort.
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References
• http://www.passivehouse-international.org/upload/ipha-brochure/• Plus Energy Houses - POLITEHNICA Plus Energy Building, A. Badea, CIEM
2011, Bucharest, 2011• EnergyPlus Documentation, version 7.0.• http://passiv.de/en/03_certification/01_certification_components/
02_certification_criteria/01_transparentcomponents/01_transparentcomponents.html
• G. E. Vlad, C. Ionescu, H. Necula, A. Badea, Simulation of an air heating/cooling system that uses the ground thermal potential and heat recovery, U.P.B. Sci. Bull., Series C, Vol. 75, Iss. 3, 2013 ISSN 2286-3540
• HVAC Solutions for the passive houses from University POLITEHNICA of Bucharest, C. IONESCU, CIEM 2011, 3-4 November 2011, Bucharest
• V Tanasiev., Contributions to the development of intelligent building concept with high energy efficiency, PhD thesis, 2012
• V. Tanasiev, B. Carutasiu, A. Badea, Dynamic simulation of energy consumption for a passive house in Romanian climate conditions,– CIEM 2013, Bucharest
• B. Carutasiu, V. Tanasiev, C. Ionescu, A. Badea, Nearly zero energy buildings in temperate continental climate, COFRET, 2014, Paris
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Acknowledgment• The work has been funded by the Sectorial
Operational Programme Human Resources Development 2007-2013 of the Ministry of European Funds through the Financial Agreement POSDRU/159/1.5/S/134398.
• This paper work was funded by program “Parteneriate” in priority areas – PN II carried out by MEN-UEFISCDI, project No. 47/2014 and Erasmus+ through financial agreement 2014-1-RO01-KA203-002986.
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Thank you for your attention !