tailieunhanh - Heat Analysis and Thermodynamic Effects Part 5

Tham khảo tài liệu 'heat analysis and thermodynamic effects part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | On the Thermal Transformer Performances 109 3. Hierarchical decomposition There are three technical system decomposition types. The first is a physical decomposition in equipment used for macroscopic conceptual investigations. The second method is a disciplinary decomposition in tasks and subtasks used for microscopic analysis of mass and heat transfer processes occurring in different components. The third method is a mathematical decomposition associated to the resolution procedure of the mathematical model governing the system operating mode Aoltola 2003 . The solar absorption refrigeration cycle presented on Fig. 1 Fellah et al. 2010 is one of many interesting cycles for which great efforts have been consecrated. The cycle is composed by a solar concentrator a thermal solar converter an intermediate source a cold source and four main elements a generator an absorber a condenser and an evaporator. The thermal solar converter constitutes a first thermal motor TM1 while the generator and the absorber constitute a second thermal motor TM2 and the condenser and the evaporator form a thermal receptor TR. The exchanged fluxes and powers that reign in the different compartments of the machine are also mentioned. The parameterization of the cycle comprises fluxes and powers as well as temperatures reigning in the different compartments of the machine. The refrigerant vapor stemmed from the generator is condensed and then expanded. The cooling load is extracted from the evaporator. The refrigerant vapor stemmed from the evaporator is absorbed by the week solution in the absorber. The rich solution is then decanted from the absorber into the generator through a pump. The number of the decomposition levels must be in conformity with the physical bases of the installation operating mode. The mathematical identification of the subsystem depends on the establishment of a mathematical system with nil degree of freedom DoF . Here the decomposition consists in a four levels .