Improving thermal and visual user comfort in very low energy buildings Alexandra DANU Liviu Andrei NEGREA Vladimir TANASIEV Adrian BADEA Horia NECULA.

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 !