Building Services Engineering 5th Edition Handbook

5 Ventilation and air
conditioning
Learning objectives
Study of this chapter will enable the reader to:
1. recognize the physiological reasons for fresh air ventilation of buildings;
2. calculate fresh air requirement;
3. understand the basic design criteria for air movement control;
4. describe the four combinations of natural and mechanical ventilation;
5. describe the working principles of air-conditioning systems;
6. calculate ventilation air quantities;
7. understand psychrometric cycles for humid air;
8. calculate air-conditioning heating and cooling plant loads;
9. describe the various forms of air-conditioning system;
10. state where reciprocating piston, screw and centrifugal compressors are suits;
11. understand the coefficient of performance;
12. explain the states of refrigerant occurring within a vapour-compression refrigeration
cycle;
13. explain the operation of refrigeration equipment serving an air-conditioning system;
14. comprehend the absorption refrigeration cycle;
15. explain how ventilation rates are measured;
16. choose suitable materials for air-conditioning ductwork;
17. understand the relationship between CFCs and the environment;
18. know the uses of CFCs, and good practice and handling procedures;
19. be able to discuss the problem of SBS;
20. know the symptoms, causes and possible cures for SBS;
21. relate the daily cyclic variation of air temperatures to the need for air conditioning.
Key terms and concepts
absorption 154; air change 127; air-conditioning systems 147; air flow rate 127; air
temperature variation 161; air velocity 127; anemometer 156; biocide treatment 160;