1. IEA.Energy Technology Perspectives 2017—Executive Summary;2017.http://www.iea.org/publications/freepublications/publication/EnergyTechnologyPerspectives2017ExecutiveSummaryEnglishversion.pdf.
2. European Parliament.Directive 2010/31/EU of the European Parliament and of the Council of 19 May 2010 on the energy performance of buildings (recast). Off J Eur Union.2010:13‐35.
3. Directive 2018/844 of the European Parliament and of the Council of 30 May 2018 amending Directive 2010/31/EU on the energy performance of buildings and Directive 2012/27/EU on energy efficiency;Parliament E;Off J Eur Union,2018
4. A review of micro combined heat and power systems for residential applications