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Energy Performance of Buildings: A Comparison of Standard Assessment Methods

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Nearly Zero Energy Building Refurbishment

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Abstract

Regarding energy performance assessment of existing building, the European Standards EN ISO 13790 and EN 15316, adopted at national level in Italy by Technical Standards UNI/TS 11300 (part 1 and 2), allow different approaches and simplification levels for defining some representative input parameters determining uncertainties in the results. Therefore, the reliability of calculated energy performance could be affected. The analysis has been supported applying a set of refurbishment actions on some representative cases of common national residential building stock, comparing the energy performance obtained with different calculation methods allowed by National Technical Standards and laws. The results show how these differences can lead to uncertainties about the class definition.

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Abbreviations

A f :

Internal floor area of the conditioned space [m2]

b tr,x :

Temperature correction factor [−]

EP gl :

Global energy performance index (EP H  + EP w ) [kWh/(m2 year)]

EP H :

Energy performance index in the heating season [kWh/(m2 year)]

EP H, env :

Energy performance index in the heating season for building envelope [kWh/(m2 year)]

EP H, L(2010) :

Energy performance index target for the new construction from 2010

EP w :

Energy performance index for domestic hot water production [kWh/(m2 year)]

Q l,e :

Emission subsystem thermal losses [MJ]

Q H, gn :

Total heat gains for the heating mode [MJ]

Q H, ht :

Total heat transfer for the heating mode [MJ]

Q H, nd :

Building energy need for continuous heating [MJ]

Q int :

Sum of internal heat gains [MJ]

Q sol :

Sum of solar heat gains over the given period [MJ]

Q tr :

Total heat transfer by transmission [MJ]

Q ve :

Total heat transfer by ventilation [MJ]

U :

Thermal transmittance [W/(m2 K)]

U g_floor :

Thermal transmittance of the ground floor [W/(m2 K)]

U u_floor :

Thermal transmittance of the upper floor [W/(m2 K)]

U wall :

Thermal transmittance of wall [W/(m2 K)]

U window :

Thermal transmittance of window [W/(m2 K)]

ϕ int :

Heat gains from internal heat sources [W]

η e :

Emission subsystem efficiency [−]

η H,gn :

Gain utilization factor [-]

η γλ :

Heating system global efficiency [−].

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Authors and Affiliations

  1. University of Pavia, Via Ferrata 1, 27100, Pavia, Italy

    R. Pernetti, L. Magnani & A. Magrini

Authors
  1. R. Pernetti
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  2. L. Magnani
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  3. A. Magrini
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Correspondence to R. Pernetti .

Editor information

Editors and Affiliations

  1. C-TAC Research Unit, University of Minho, Guimarães, Portugal

    Fernando Pacheco Torgal

  2. Dipartimento Patrimonio Architettonico e Urbanistico, Università degli Studi Mediterranea di Reggio Calabria, Salita Melissari, Reggio Calabria, Italy

    Marina Mistretta

  3. Vilnius Gediminas Technical University, Vilnius, Lithuania

    Artūras Kaklauskas

  4. Department of Engineering Sciences, Uppsala University The Ångström Laboratory, Uppsala, Sweden

    Claes G. Granqvist

  5. GREA Innovació Concurrent, Universitat de Lleida Edifici CREA, Lleida, Spain

    Luisa F. Cabeza

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Pernetti, R., Magnani, L., Magrini, A. (2013). Energy Performance of Buildings: A Comparison of Standard Assessment Methods. In: Pacheco Torgal, F., Mistretta, M., Kaklauskas, A., Granqvist, C., Cabeza, L. (eds) Nearly Zero Energy Building Refurbishment. Springer, London. https://doi.org/10.1007/978-1-4471-5523-2_7

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  • DOI: https://doi.org/10.1007/978-1-4471-5523-2_7

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  • Online ISBN: 978-1-4471-5523-2

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