


Politecnico di Torino  
Academic Year 2009/10  
02CXFAX, 01CXFDR Heat transfer, acoustics and lighting engineering 

1st degree and Bachelorlevel of the Bologna process in Civil Engineering  Vercelli 1st degree and Bachelorlevel of the Bologna process in Mechanical Engineering  Vercelli 





Objectives of the course
The problems about heat transfer and heat loads control is one of the many problems that the engineer has to face both in civil and industrial design.. The first part of teaching is devoted to the study of heat transfer mechanisms and laws running them in order to give the student, from a theoretical point of view, necessary knowledge to solve problems of heat exchange in steadystate and / or in unsteady state condition for relatively complex cases, and, from application point of view, the knowledge of equipment, tools and plants used to accumulate and transfer heat efficiently. The second part of teaching aims to provide some hints on basic tools and calculus of lighting plans and of environmental and industrial acoustics protection.

Expected skills
Recognizing the mechanisms of heat transfer in various situations and know how to combine and model them for solving application problems occurring in engineering practice. Basic knowledge of lighting and acoustics elements useful to perform first approximation calculus on plans and components performance.

Prerequisites
Calculus I and II, Mechanics.

Syllabus
Heat transfer:
Steady conduction in solids, Fourier law, plan and cylindrical case. Unsteady conduction in solids with very high conductivity. Thermal radiation transfer. Definitions and fundamental laws. The black body Kirchoff laws. The real bodies and gray model. View factor. Radiation exchange between blacks and gray bodies. Equivalent electrical grids. Natural and forced convection, coefficient of heat transfer for fluidwall exchange. Dimensional analysis. Reynolds analogy. Technical applications: overall heat transfer coefficient. Thermal insulation. Steady conduction with internal heat generation. Finned surfaces; heat exchangers. Lighting: Photometric quantities, visibility factor and its Purkyné effect. Glare. Artificial sources and their performance. Artificial lighting in closed environment : total light flows method and light flow utilization coefficient method. Open spaces lighting. Natural lighting in closed environment and daylight factor. Acoustics: Overview of physical and physiological acoustics; normal audiogram. Acoustic properties of materials. Acoustic behavior of closed environment and evaluation methods according to their use . Environmental policy design . Acoustic waves transfer through walls and their soundproofing power, mass low. Noise control emitted by technological plants. Machinery acoustical insulation. Measuring noise methods. 
Laboratories and/or exercises
The calculus practice will be developed in classroom or in laboratory.
through measures flow, temperature, pressure and humidity useful to run mass and energy balance or to tracking thermodynamics cycles. In particular, are foreseen lessons about: In classroom Example Problems: ' Overall heat transfer coefficient for plan and cylindrical walls in series and parallel. ' Finned surface ' Pressure loss in simple networks ' Natural and forced convection on plan and cylindrical surfaces ' Heat exchange for radiation between gray bodies and equivalent electrical networks In laboratory ' Temperature measurements, velocity, relative humidity and mass and energy balances on a conditioning device. ' Temperature, mass flow rate and pressure losses measurements for an heat exchanger operating in parallel or in counter flow feature. ' Outdoor lighting system design ' Noise environmental measure. 
Bibliography
a) Reference texts
1) Notes of lectures and educational materials distributed during the course. 2) G.V. Fracastoro, Fondamenti a applicazioni di termidinamica, Otto Editore, Torino 3) Y. A. Çengel, Termodinamica e Trasmissione del calore McGrawHill, New York, 1998 b) For further explanation and consultation: 4) C. Bonacina  A. Cavallini  L. Mattarolo, Trasmissione del calore, CLEUP Editore, Padova. 5) A. Bejan, Heat transfer, Ed. J. Wiley & Sons, Inc. New York 6) Kreith, principi di trasmissione del calore, Liguori, Napoli, 1974. 
Revisions / Exam
The examination includes a written and an oral test. The written test, two hours lasting will focus on the settlement of three typical problems developed during the course. The pass mark achievement allows the student to sit the oral exam, where the written total mark will be discussed. On average the oral examination will last approximately 20 minutes.
A positive mark must be registered in the same session in which it is claimed, otherwise the mark obtained will decay. 
