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Improving thermal and visual user comfort in very low energy buildings
Alexandra DANU Liviu Andrei NEGREAVladimir TANASIEVAdrian BADEAHoria NECULA
Index
1. About Passive Houses
2. Passive House UPB: case study
3. HVAC system
4. Simulations
5. Measurements
6. Interior comfort
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
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
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
Data acquisition and HVAC system
Wi-fi data acquisition
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
Mesurements and discussions
Variation of inside average temperature in the passive house of UPB during one year
Interior comfort
Evolution of the interior and exterior temperature on 22nd of
July 2014
Evolution of the HVAC temperatures on 22nd of July
2014
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.
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
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.
Thank you for your attention !
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