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Scheda Riassuntiva
Anno Accademico 2023/2024
Scuola Scuola di Ingegneria Industriale e dell'Informazione
Insegnamento 097342 - HEATING AND COOLING SYSTEMS A
Docente Molinaroli Luca
Cfu 10.00 Tipo insegnamento Monodisciplinare

Corso di Studi Codice Piano di Studio preventivamente approvato Da (compreso) A (escluso) Insegnamento
Ing Ind - Inf (Mag.)(ord. 270) - BV (477) ENERGY ENGINEERING - INGEGNERIA ENERGETICA*AZZZZ097344 - HEATING AND COOLING SYSTEMS B
097342 - HEATING AND COOLING SYSTEMS A

Obiettivi dell'insegnamento

The course aims to provide advanced knowledge of the working principles, the most influential parameters and the sizing methods of devices used to supply heating or cooling power (e.g. heat pumps, chillers, boilers), to transfer or reject heat (e.g. heat exchangers, cooling towers) and to distribute heat transfer media (e.g. hydronic circuits).

The approach used in the course involves both the discussion of the fundamentals that regulate the operation of the abovementioned systems (theoretical lectures) and the presentation of the design and sizing criteria through numerical applications (practical lectures).


Risultati di apprendimento attesi

After taking the exam the student:

1. Knows the fundamentals of the devices used to supply heating or cooling power, to transfer or reject heat and to distribute heat transfer media.

2. Describes both qualitatively/graphically and in mathematical form the operation of the components and of the devices used for the production, distribution and use of thermal and/or cooling power.

3. Knows the methodologies needed to size a new system or required to analyze the operation of an existing system.


Argomenti trattati
  1. Vapour compression systems.  Operating principle and working cycle. I law and II law analysis. Standard and advanced configurations. Influence of working conditions on system performance. Sources and sinks for actual vapour compression systems. Seasonal performance. Working fluids for vapour compression systems. Classification and safety aspects. Thermodynamic properties of the fluids and their influence on system performance. Compressors for vapour compression systems. Classification and operating principle. Compressor envelope, volumetric efficiency, isentropic efficiency and built-in volume ratio. Influence of working conditions on compressor performance. Methods for sucked mass flow rate variation.
  2. Absorption systems. Operating principle and working cycle. I law and II law analysis. Working pairs for absorption systems. Single effect, double effect and triple effect H2O-LiBr systems. Single effect and GAX NH3-H2O systems. Half effect systems. Heat transformer.
  3. Boilers. Classification and operating principle. Heat losses in boiler systems during continuous and discontinuous operation. Seasonal performance. Standard boiler, sliding temperature boiler and condensing boiler.
  4. Heat exchangers. Classification. Counter-flow, parallel-flow and cross-flow heat exchangers. Overall heat transfer coefficient and finned surfaces. LMTD method for thermal design of heat exchanger. Cross flow factor. Fouling. Effectiveness-NTU method for thermal analysis of heat exchanger in off-design conditions. Evaporators and condensers. Cooling towers. Classification. Heat and mass transfer in cooling towers. Merkel’s theory. Influence of air wet bulb temperature, approach temperature difference and range temperature difference on cooling tower performance. Water mass balance in a cooling tower. Plume formation.
  5. Hydronic systems. Open and closed systems. Components of hydronic systems. Parallel and series systems. Capacity control in hydronic systems. Primary pumping and primary-secondary pumping. Balancing of complex systems.

N.B.

Topics 1-5 are compulsory for students that attend the “Heating and Cooling Systems A” course (10 credits).

Topics 1, 2 and 4 are compulsory for students that attend the “Heating and Cooling Systems B” course (8 credits).

The evaluation method is the same for both courses.


Obiettivi di sviluppo sostenibile - SDGs
Questo insegnamento contribuisce al raggiungimento dei seguenti Obiettivi di Sviluppo Sostenibile dell'Agenda ONU 2030:
  • SDG7 - AFFORDABLE AND CLEAN ENERGY

In the heating sector, heat pumps are largely recognised as a reliable and modern technology to be used to improve energy efficiency and reduce the environmental impact of heat generation systems.

In the course, the working principles and the typical performance of advanced and cleaner technologies for the heating power production, i.e. heat pumps, are discussed. A comparison with baseline technology for heat generation, i.e. boiler, is also provided with the aim of highlighting the differences from the energy, economic and environmental perspectives.


Prerequisiti

A basic knowledge of Thermodynamics and Heat Transfer is required.


Modalità di valutazione

The final examination consists of a written test and an oral test.

The written test consists of two exercises and is aimed to evaluate the ability of the student in solving numerical problems.

The oral test aims to evaluate the student’s knowledge of the theoretical background both from the fundamentals point of view and from the analysis of the operation of a system point of view. Only students who obtained a "passed" grade in the written test may take the oral test.


Bibliografia
Risorsa bibliografica facoltativaS.K. Wang, Handbook of Air Conditioning and Refrigeration, Editore: McGraw-Hill, Anno edizione: 2001, ISBN: 0070681678
Risorsa bibliografica facoltativaK. Herold, R. Radermacher, S.A. Klein, Absorption Chillers and Heat Pumps, Editore: CRC Press, Anno edizione: 1996, ISBN: 0849394270
Risorsa bibliografica facoltativaS. Kakaç, H. Liu, Heat Exchangers - Selection, Rating and Thermal Design, Editore: CRC Press, Anno edizione: 2002, ISBN: 0849309021

Software utilizzato
Nessun software richiesto

Forme didattiche
Tipo Forma Didattica Ore di attività svolte in aula
(hh:mm)
Ore di studio autonome
(hh:mm)
Lezione
70:00
105:00
Esercitazione
30:00
45:00
Laboratorio Informatico
0:00
0:00
Laboratorio Sperimentale
0:00
0:00
Laboratorio Di Progetto
0:00
0:00
Totale 100:00 150:00

Informazioni in lingua inglese a supporto dell'internazionalizzazione
Insegnamento erogato in lingua Inglese
Disponibilità di materiale didattico/slides in lingua inglese
Disponibilità di libri di testo/bibliografia in lingua inglese
Possibilità di sostenere l'esame in lingua inglese
Disponibilità di supporto didattico in lingua inglese
schedaincarico v. 1.8.3 / 1.8.3
Area Servizi ICT
02/03/2024