The index of thermo-ecological cost can be determined by solving the set of thermoecological cost balance equations: Methodology of the Thermoecological Cost Calculation (brief description) comparison of sustainability of different useful products.determination of pro-ecological tax replacing existing PIT and VAT taxes,.evaluation of the ecological harmfulness of particular useful goods in their whole life time (thermo-ecological life cycle analysis),.investigation of the influence of interregional exchange upon the depletion of domestic natural resources,.evaluation of harmful impacts of waste products,.optimisation of design and operational parameters to ensure minimum depletion of natural resources,.selection of the kind of technology that ensures minimal consumption of non-renewable natural resources,.influence of the operational parameters of energy and technological systems upon the depletion of non-renewable natural resources,.Generally, the thermo-ecological cost analysis can be applied to the solution of the following problems: It has to be stressed that the thermoecological cost is expressed in exergy (energy) units not in monetary ones. Moreover, the index of thermo-ecological cost should take into account the total life-time of the considered product or system. The thermo-ecological cost is defined as the cumulative consumption of non-renewable exergy connected with the fabrication of a particular product with inclusion of additional consumption resulting from the necessity of compensation of environmental losses caused by rejection of harmful substances to the environment (Fig 1.). The influence of human activities on the depletion of natural resources can be evaluated by means of cumulative exergy calculus. Exergy can be applied as a measure of the quality of natural resources. The depletion of non-renewable resources should be minimised to keep them for future humankind. These unfavourable effects can be divided into two groups: depletion of limited non-renewable resources and rejection of harmful substances. Industrial processes have an unfavourable influence upon the natural environment.
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