Design of complete central heating, ventilating and air-conditioning systems in buildings (dwellings, office buildings, hospitals, hotels, etc). Methods for load assessment and calculation procedures either manual or by software. Hardware of air-conditioning plants and elements of their maintenance. 

Course Description  

Theory: Thermal comfort, indoor air quality, Psychrometry, sensible and latent heat, psychrometric chart, psychrometric processes and relevant calculations on the chart. Types of air-conditioning systems, characteristics, advantages and disadvantages. Building orientation, solar irradiance, climate data. Thermal (winter) and cooling (summer) load assessment, external cooling loads (direct solar gains, heat gain through building envelope, thermal inertia of the building, time lag, air infiltration gains), internal cooling loads (due to people, lighting and electrical equipment). Complete design of air-conditioning systems, calculations for the design of air and water networks, pumps and fans, air ducts, humidifiers, cooling coils. Automatic control systems, energy efficiency of air-conditioning systems. Heat pumps, principles of operation of basic refrigeration cycles (standard compression cycle, absorption cycle), description of the corresponding refrigeration plants and relevant hardware, environmental issues, use of renewable sources of energy, reference to non-conventional refrigeration cycles and current research.

Laboratory: By means of laboratory exercises demonstrated on a semi-central air-conditioning educational plant device, the students recognize the basic components and control systems, perform measurements of the psychrometric variables, velocity and mass flowrate of air, realize the basic psychrometric processes and make relevant calculations (sensible heating, heating with humidification, mixing of fresh air with return air, cooling with dehumidification), check and assess the satisfactory loading and effective operation of the unit. In addition, they perform cooling load computations by means of available commercial software, as well as air ducts and fan calculations. 

Expected Course Outcome

By the end of the course the students should: 

• Understand the types, basic characteristics, structure and operation of air-conditioning systems and refrigeration plants for various applications.
• Possess the required knowledge to make calculations for the design and dimensioning of the basic components of an air-conditioning system 

Bibliography

Greek:

 

1.  ΘΕΡΜΑΝΣΗ-ΨΥΞΗ-ΑΕΡΙΣΜΟΣ, Σ.Ν.Χαλικιά, Εκδοση Ο.Ε.Δ.Β., 1998

 

English:

1. ASHRAE HANDBOOK OF FUNDAMENTALS, ASHRAE 1997.
2. Jones W P, “Air Conditioning Engineering”, 4th Edition, Edward Arnold, 1994
3. Legg R, “Air Conditioning Systems”, Batsford, 1991.
4. Eastop T D & Watson W E, Mechanical Services for Buildings, Longmans, 1992.
5. Chadderton D V,”Air Conditioning – A Practical Introduction”, Spon Press.
6. Jones W P, “Air Conditioning Applications and Design”, 2nd Edition, Edward Arnold, 1997.
7. Awbi H, “Ventilation of Buildings”, Taylor & Francis, 2003.
8. CIBSE Guide Book “A” and “B”.