1. Tech. Rep.;Plan Climate 2004 (France),2004
2. Energy in Figures-Statistical Pocketbook, Tech. Rep.;EU,2012
3. Household Energy Consumption by End-Use in the EU-27, Tech. Rep., European Environment Agency, 2012.
4. Thermal Energy Storage – Systems and Applications;Dincer,2002
5. A review on packed bed solar energy storage systems;Singh;Renew. Sustain. Energy Rev.,2010