Transformity and Specific Emergy

Transformity and specific emergy are UEVs calculated as the total amount of emergy required to make a product or for service divided by the available energy of the product (resulting in a transformity) or divided by the mass of the product (resulting in a specific emergy). Figures 1 and 2 illustrate a static method of calculating a transformity first in equation form (Figure 1) and then with example numbers (Figure 2). The transformity of the product is the 'emergy' of the product divided by the 'energy' of the product (units are sej J-1). If the output flow is in mass, then the specific emergy of the product is the emergy of the output divided by the mass (units are sej g-1).

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