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Effect of the climatic conditions in energy efficiency of Spanish existing dwellings

  • Juan Carlos Ríos FernándezEmail author
  • Juan M. González-Caballín
  • Antonio José Gutiérrez-Trashorras
Original Paper
  • 23 Downloads

Abstract

The member states of the European Union must increase the energy efficiency in residential buildings within the plan to reduce the external energy dependence and energy shortage. In the present work, a standard building representative of the existing buildings in Spain built before 1980 was used. An evaluation of the energy rating of that building in each climatic zone of Spain was carried out to assess the influence of these climatic conditions on energy consumption and greenhouse gas emissions. This analysis was carried out with Cerma software according to the calculation procedure demanded by the Spanish Building Technical Code. Results show that E or F energy score was obtained for the different climatic zones and with significant differences in CO2 emissions, even for climatic zones with the same energy rating. A sensitivity study of the necessary enhancements in each climatic zone was carried out to analyze the influence of most common energy demand and thermal system improvements, and combinations of them. Also, the minimum requirements to obtain D qualification in each Spanish climatic zone were obtained. As a result, it is possible to reduce emissions in Spain by over 3.5 Mt CO2 per year. In climatic zones with initial qualification E, it is possible to reach a D label, avoiding 40% of the initial CO2 emissions and reducing primary energy consumption to about 50 kWh/m2 year (over 60% reduction). For the climatic zones with initial qualification F, over 53% of the initial CO2 emissions are avoided by reaching D label. Zones with the highest heating demand (over 230 kWh/m2 year) and very low cooling demand need to improve thermal systems by means of a heat pump. Finally, some policy measures to create lines of financial aids or subsidies for the implementation of actions to reduce energy demand in Spanish homes are proposed.

Graphic abstract

Keywords

Spanish climatic zones Residential building Existing dwellings Energy efficiency Energy performance certificate Greenhouse gas emission reduction 

List of symbols

I0

CO2 emissions generated by the building (kg CO2/m2 year)

Ir

Average CO2 emissions from residential buildings strictly meeting CTE requirements (kg CO2/m2 year)

IS

Average CO2 emissions from existing residential buildings in 2006 (kg CO2/m2 year)

nr

Air renewals

R

Ratio between CO2 emissions of 50th and 10th percentiles in residential buildings strictly meeting BTC requirements

R

Ratio between CO2 emissions of 50th and 10th percentiles in existing residential building stock

U

Thermal transmittance (W/m2 K)

λ

Thermal conductivity (W/m2 K)

σ1

First energy efficiency rating index

σ2

Second energy efficiency rating index

Abbreviations

Bio

Biomass

BREEAM

Building Research Establishment Environmental Assessment Method

BTC

Building Technical Code

COP

Coefficient of performance

DHW

Domestic hot water

EEOnt

Energy efficiency ontology

EER

Energy efficiency ratio

EESs

Energy efficiency services

EU

European Union

GHG

Greenhouse gases

HP

Heat pump

IDAE

Institute for Energy Diversification and Saving

IEA

International Energy Agency

INE

National Statistics Institute

LEED

Leadership in Energy and Environmental Design

LPG

Liquefied petroleum gas

MINETUR

Ministry of Industry, Energy and Tourism

MSF

Modified solar factor

NBC

National Building Code

NEEAP

National Energy Efficiency Action Plan

NG

Natural gas

RBHI

Regulations on Building Heating Installations

RD

Royal decree

SB

Standard building

SF

Solar factor

TI

Thermal insulation

Chemical symbol

CO2

Carbon dioxide

Notes

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of EnergyUniversity of OviedoOviedoSpain

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