The authors of the main thermoeconomic methodologies developed in the last two decades have recentlyfocused their efforts on the analysis of dissipative devices, i.e. those components whose productive purposeis neither intuitive nor easy to define. Coherent and unanimously accepted cost structures have beenidentified for dissipative components, while ambiguities still exist as concerns the cost allocation principlesto be adopted. Being this aspect evidently cost-influencing, accurate analyses focused on the subjectivityof results are needed. This paper is structured in two parts. In the Part I an in-depth study of somecritical issues arising from the thermoeconomic analysis of a 1.5 MWc industrial chiller is presented. Theattention is focused on the role of the condenser and the throttling valve (considered as a limit conditionfor an expander with very low isentropic efficiency); marginal analyses performed on the condensationpressure and the isentropic efficiency of the expander provided elements to assess the rational of the costallocation principles. Attempting to refugee any cost allocation criterion based on postulates, the conceptof Scope is identified as a possible non-arbitrary basis for cost allocation in dissipative devices; consequently,a new topology is defined, abandoning the conventional classification between dissipative andproductive units, toward a new distinction between Product Makers and Product Takers functions. Theproposed approach is applied to the cost accounting of the examined chiller, revealing inadequate andless explicative than the conventional thermoeconomic approaches due to its ‘‘intrinsically differential”nature. In the Part II of this paper the proposed approach will be applied to an Optimization problem,revealing very flexible and insightful.
|Numero di pagine||14|
|Stato di pubblicazione||Published - 2010|
All Science Journal Classification (ASJC) codes
- Building and Construction
- Mechanical Engineering
- Management, Monitoring, Policy and Law