Hi Anda! Cumulative energy demand may be lower or higher than

gross energy intensity, so they are not the same.

Dear Anda ,

Cumulative energy demand of a product (also called ‘primary energy consumption’) represents the direct and indirect energy use throughout the life cycle (or a part of the life cycle), including the energy consumed during the extraction , manufacturing, and disposal of the raw and auxiliary materials.

gross energy intensity represents total consumption of a particular energy source(s) or fuel(s) divided by unit level. so the gross energy intensity is a ratio (energy/....) but CED not.

those are not same.

Both are not exactly same but close

Ehsan Khalili Muntasir Murshed Vitalii Nitsenko

Thank you for your answers. Still not quite sure I get this.

The case is following. In two separate papers the energy demand for a production of one specifical chemical ir reported like this:

1) as cumulative energy demnad MJ/kg produkt

2) gross energy intensity MJ/kg product.

So where there is a difference?

Thank you very much! I appreciate.

Intensity is probably measured in terms of the total amount of energy used to produce the economic output whereas energy demand is measured in terms of conventional energy units. That's the basic difference.