20801672 - ENVIRONMENTAL TECHNICAL PHYSICS

THE COURSE AIMS AT PROVIDING THE KNOWLEDGE NECESSARY TO EVALUATE HEAT TRANSFER PROCESSES (CONDUCTION, CONVECTION, RADIATION) BETWEEN BODIES AND INSIDE A BODY, AS WELL AS THE TEMPERATURE VARIATIONS THESE PROCESSES CAUSE. ANOTHER AREA IS THAT OF INDOOR THERMAL COMFORT.
teacher profile | teaching materials

Mutuazione: 20801672 FISICA TECNICA AMBIENTALE in Ingegneria civile L-7 N0 ASDRUBALI FRANCESCO

Programme

1. Heat transfer
Conduction. Thermal fields. Postulate and Fourier equation. Steady state wall. Fourier wall.
Convection. Phenomenological analysis. Boundary layer. Natural and forced convection. Dimensional analysis method. Reynolds, Prandtl, Grashof and Nusselt numbers.
Radiation. Radiant energy: definitions, properties, absorption coefficient. Emission and absorption properties of condensed bodies. Principle of Kirchhoff. Laws of the black body. Radiation properties of the bodies. Greenhouse effect. Heat exchange between facing flat surfaces. Radiation shields.
Applications. Adduction. Multi-layer flat wall between two fluids. Transmittance. Wall cavities. Circuits for heat distribution. Matt and glazed walls exposed to solar radiation. Insulating materials.
Solar Energy. Characteristics of solar radiation. Devices for solar energy capitation (flat panels and parabolic-cylindrical systems) and evaluation of their performance.

2. Thermodynamics
Definitions: thermodynamic systems, equilibrium, transformations. Clapeyron plan. Zero Principle. Temperature measurement. First Principle. Thermal machines. Second principle. Entropy and entropic plan. Reversibility. Entropy and irreversibility.
Properties of Matter. Aggregation states. State diagram of a pure substance. Properties of two-phase mixtures. Perfect gases. Van der Waals Fluid. Principle of corresponding states. State equations. Phase diagrams: entropic, enthalpic, refrigerating diagram.
Open thermodynamic systems. Energy equation and applications in steady state. Reversible work of an open system. Continuity equation and Bernoulli equation.
Thermal machines. Advantages and applications of steam machines. Rankine cycle. Rankine-Hirn cycle. Systems with turbine expanders. The regeneration of the heat and steam extractions.
Refrigerating machines. Vapour compression machines. Reverse Rankine cycle. Efficiency. Irreversibility. Refrigerants. Compression heat pumps. Absorption machines: operating principle.

Air conditioning. Atmospheric air. Psychrometric variables. The ASHRAE psychrometric chart. Thermal comfort. Psychrometric processes. Air treatments. Description of an air conditioner. Regulation. Installations


3. Acoustics
Physical Acoustics: acoustic parameters, sound fields, sources and spectra. Sound-absorbing materials. Sound insulating structures.
Psyco-acoustics. The hear: hearing physiology, hearing sensation; quality of sensation. Audiograms. The sound level meter. Noise and noise disturbance. Phonometric measurements.
Elements of room acoustics: Reverberation, Sabine theory. Room acoustics design and correction. Actions for noise mitigation.

4. Lighting Technique
Photometry. The eye. The quality of vision. The visible radiant energy. The visibility curve. Visibility curve construction. Definition of photometric quantities.
Artificial light sources. Features of a lighting source. Classification of lamps. Photometric curves.
Elements of lighting engineering. Indoors and outdoors artificial lighting. The total flux method. Applications. Daylighting.



Core Documentation

Recommended reading:
1) M. Felli: Lezioni di Fisica Tecnica 1: Termodinamica, Macchine, Impianti, Nuova edizione a cura di Francesco Asdrubali, Morlacchi editore, 2009.
2) M. Felli: Lezioni di Fisica Tecnica 2: Trasmissione del Calore, Acustica, Tecnica dell’Illuminazione, Nuova edizione a cura di Cinzia Buratti, Morlacchi editore, 2010.


Type of evaluation

The final evaluation includes a written test, with both questions with open answers and an exercise, and an oral test to follow.