italian version

Aims :

The aim of this module is to provide the student with a detailed knowledge of reverse thermodynamic cycles used in applications at temperatures below ambient. In order to achieve this aim the features of systems, plants and components will be described and evaluated.

Topics :

Basic Thermodynamics. Reverse Carnot cycle. First and second Law efficiency. Thermodynamic charts. Vapour compression refrigerating cycle. Refrigerant fluids. Functional and environmental requirements for the working fluids. Synthetic and natural refrigerants. Application domains for the specific refrigerants. Liquid subcooling and suction superheating. Liquid/suction heat exchanger. Applicative limits of single stage cycles. Two stages cycles. Assessment of optimal intermediate pressure. Dual temperature cycles. Cascade cycles.
Main components for the vapour compression cycles. Dynamic and volumetric compressors; volumetric and isentropic efficiency. Condensers and evaporators. Throttling valves.
Gas liquefaction. Linde cycle. Inversion temperature. Claude cycle. Collins cycle. Reverse Stirling cycle.

Textbooks :

Lecture notes (available at photocopies desk and on-line).
Cavallini, L. Mattarolo, Termodinamica applicata, CLEUP, Padova, 1992;
W.F. Stoecker, Industrial Refrigeration Handbook, McGraw-Hill, New York, 1998.

Exam :

Oral examination.

Tutorial Session :

In the hour following classes or by appointment (tel 0712204432)