12. As part of the mandatory energy audit (transposition of European Directive 2012/27/EU on energy efficiency), the scope of the audit for a company is 124 buildings housing similar car garages + a head office social (office activity). What is the minimum number of sites where the company must carry out an energy audit? 

The EU ETS Directive 2009/29/EC establishes the principle of 'cap and trade', how does it work? (multiple answers) 

How to calculate the overall efficiency of a boiler? 

What does reaching factor 4 means? 

What is the purpose of the EN 16247-1 standard? (many possible responses)

What is the unit of thermal resistance? 

Standard NF EN 16247 refers to:

How can the flow rate of a hot dust-loaded gas at the outlet of an industrial dryer be measured?

The steam boiler has an annual consumption of 4.3GWh of gas with an efficiency of 0.87, what would be the energy savings in MWh realized on this annual consumption if we implement heat recovery by an economizer with an efficiency of exchange of 0.6? what financial savings if the cost of the kWh is 5.5€cts excluding VAT? What is the return on investment time if the operation costs €28,000?