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Buchberger, Elena (2008) Using task ambient system to improve comfort and productivity in office buildings. [Ph.D. thesis]

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Abstract (english)

Ventilation and thermal conditions inside a building are among the primary factors determining human health, comfort and well-being.
They cause different effects on the human body through the physiological effect of air purity and motion, and indirect effect through their influence on the temperature and humidity.
Uniform, stable and neutral indoor thermal environments are the purposes of heating, ventilating, and air-conditioning (HVAC) systems.
The aim is to assure neutral sensation in order to achieve thermal comfort for the occupants.
In the last six decades many researches have demonstrated how the thermal environment and the air quality in buildings affect occupants'health, comfort and productivity.
As well known thermal dissatisfaction is the major complaint in office buildings, mainly caused by local discomfort.
Building occupants are a rich source of information about indoor environmental quality, its effect on comfort and productivity as confirmed by the results of a survey developed by the Center for the Built Environment at the University of California, Berkeley. [Zagreus L. , 2004] The result of this survey confirmed how the almost homogenous environment does not take into account individual preferences in terms of air temperatures, movement and thermal sensation.
Cool hands and feet, and warm head discomforts are common complaints in office environments.
These localized discomforts of the extremities dictate the overall thermal comfort felt by the occupant, and removing discomfort in these body parts is essential in maintaining whole body thermal comfort.
The extremities are vulnerable to discomfort in part because they are uninsulated or relatively uninsulated.
However the low clothing levels make it possible to locally heat or cool the extremities in an energy-efficient manner, thereby restoring comfort.
The air that reaches the occupant's breathing zone may be of poor quality because has already been mixed with the room air, gaining heat and humidity and being polluted due to emissions of building materials and the occupants themselves.
Recent evidence from laboratory researches suggested that diversified environments could produce higher levels of thermal comfort than is possible for the best-controlled neutral and uniform environments. [Zhang, H., 2003] Personalized Ventilation System (PVS) is a development of the HVAC system that has the potential to improve occupants' comfort with the possibility of generating and controlling their own preferred microenvironment, decrease Sick Building Syndrome (SBS) symptoms and reduce the risk of transmission of contagious agents between occupants.
PVS systems aim to avoid the undesirable effects of the traditional HVAC system by supplying treated outdoor air directly to the breathing zone of each occupant.
In order to perform efficiently in room practice, the design of PVS should take into consideration the occupants' activity and the airflow interaction with the thermal plume around the human body. [Melikov A. K. , 2004] The use of PVS systems could allow a large range of environmental temperature by introducing local cooling/heating asymmetries.
In this way the energy needed for ambient conditioning could be optimized while the individual is empowered to adjust the immediate environment to his or her personal preferences.
The purpose of this study was to evaluate whether it is possible to provide comfort to the occupants by PVS in cool and warm environments, and whether the productivity of people is enhanced.
We also compared the efficiency of PVS vs. traditional HVAC system by the use of different computational tools.

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EPrint type:Ph.D. thesis
Tutor:Peron, Fabio
Ph.D. course:Ciclo 19 > Corsi per il 19simo ciclo > FISICA TECNICA
Data di deposito della tesi:January 2008
Anno di Pubblicazione:January 2008
Key Words:thermal comfort, productivity, laboratory test
Settori scientifico-disciplinari MIUR:Area 08 - Ingegneria civile e Architettura > ICAR/10 Architettura tecnica
Struttura di riferimento:Dipartimenti > pre 2012 - Dipartimento di Fisica Tecnica
Codice ID:562
Depositato il:12 Sep 2008
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Le url contenute in alcuni riferimenti sono raggiungibili cliccando sul link alla fine della citazione (Vai!) e tramite Google (Ricerca con Google). Il risultato dipende dalla formattazione della citazione.

1. Arens E., Zhang H., (2006). The skin’s role in human thermoregulation and comfort, from Thermal and Moisture Transport in Fibrous Materials, edited by N. Pan and P. Gibson Cerca con Google

2. Arens, E., Zhang H., Huizenga C., (2006). Partial- and whole body thermal sensation and comfort Part II: non-uniform environmental conditions. Journal of Thermal Biology, Vol. 31, 60- 66. Cerca con Google

3. ASHRAE (2004). ASHRAE Standard 55-2004, Thermal Environmental Conditions for Human Occupancy. Atlanta, ASHRAE, Inc. Cerca con Google

4. Attia, M. and P. Engel (1981). Thermal Alliesthesial Response in Man Is Independent of SkinLocation Stimulated Physiology & Behavior 27(3): 439 - 444. Cerca con Google

5. Bauman F., Carter T., Baughman A., (1998). Field Study of the Impact of a Desktop Task/Ambient Conditioning System in Office Buildings, eScholarship Repository, University of California Cerca con Google

6. Brager G., de Dear R., (2000). A Standard for Natural Ventilation, ASHRAE Journal. Cerca con Google

7. Cabanac, M. (1971). The Physiological Role of Pleasure. Science 173: 1103 - 1107. Cerca con Google

8. Chen Q., Moser A., & Suter P. (1992). A numerical study of indoor air quality and thermal comfort under six kinds of air diffusion. ASHRAE Transactions, 98(1), 203-217. Cerca con Google

9. Fang L., Wyon D.P., Clausen G., Fanger P.O. (2004). Impact of indoor air temperature and humidity in an office on perceived air quality, SBS symptoms and performance, Indoor Air 2004; 14 (Suppl 7): 74–81 Cerca con Google

10. Fanger, P.O., Melikov A. K., et al. (1988). Air Turbulence and Sensation of Draught. Energy and Buildings 12: 21 - 39. Cerca con Google

11. Fisk W.J., Faulkner D., Pih’ D., McNeel, Bauman F., Arens E., (1991) Indoor Air Flow and Pollutant Removal in a Room with Task Ventilation, Indoor Air, 3, 247-262 Cerca con Google

12. Givoni B., (1969). Man, climate, and architecture, Amsterdam, New York, Elsevier. Cerca con Google

13. Goto, T., J. Toftum, et al. (2002). Thermal Sensation and Comfort with Transient Metabolic Rates. Proceedings of Indoor Air Conference, Monterye, USA. Cerca con Google

14. Hagino, M. and J. Hara (1992). Development of a Method for Predicting Comfortable Airflow in the Passenger Compartment. SAE Technical Paper Series 922131: 1 - 10. Cerca con Google

15. Hedge A. (2004). Chilly Offices Up Errors. ASHRAE e-News Oct. 21. Cerca con Google

16. Heschong L., (1979). Thermal Delight in Architecture, The MIT press. Cerca con Google

17. Holmberg, I. and D.P. Wyon (1969). The Dependence of Performance in School on Classroom Temperature. Educational and Psychological Interaction 31. Cerca con Google

18. Humphreys M.A., Nicol J.F., McCartney K.J., (2002). An analysis of some subjective assessments of indoor air-quality in five European countries. Indoor Air 2002 Vol. 5, 86-91 Cerca con Google

19. Huizenga C., Abbaszadeh S., Zagreus L., Arens E., (2006). Air Quality and Thermal Comfort in Office Buildings: Results of a Large Indoor Environmental Quality Surve. Proceedings of Healthy Buildings, Lisbon, Vol. III, 393-397 Cerca con Google

20. Lechner R., (2001). Heating, Cooling and Lighting, John Wiley & sons, inc Cerca con Google

21. Marston Fitch J., (1972). American Building: The Environmental Forces That Shapes It, Boston MA: Huoghton Miffin Co. Cerca con Google

22. Melikov A.K., (2004). Personalized Ventilation Indoor Air 2004; 14 (suppl.7): 157-167 Cerca con Google

23. Melikov A.K., Knudsen G.L., (2007). Human Response to an Individually Controlled Microenvironment, vol.13, n.4 HVAC&R RESEARCH. Cerca con Google

24. Niemela, R., M. Hinnula, K. Reijula, and J. Railio, (2002). The effect of air temperature on labour productivity in call centers – A case study. Energy and Buildings, Vol. 34 (8): 759 – 764. Cerca con Google

25. Parsons, K. (1983) Human Thermal Environment, London, UK: Taylor & Francis, 199-217. Cerca con Google

26. Pepler, R.D., R.E. Warner (1968). Temperature and Learning: An Experimental Study. ASHRAE Transactions 74, 211 – 219 Cerca con Google

27. Persily A., (2005). What we think we know about ventilation Preceedings of Indoor Air 2005. Bejiin Cerca con Google

28. Seppänen O., Fisk W., (2006). Some Quantitative Relations between Indoor Environmental Quality and Work Performance or Health. Vol. 12, n.4 HVAC&R RESEARCH. October 2006 Cerca con Google

29. Tanabe, S. and N. Nishihara, (2004). Productivity and fatigue. Indoor Air, Vol. 14 (suppl 7): 126–133. Cerca con Google

30. Tham KW and HC Willem, (2004). Temperature and ventilation effects on performance and neurobehavioral-related symptoms of tropically acclimatized call center operators near thermal neutrality. ASHRAE Transactions. Cerca con Google

31. Toftum J. (2004). Air movement-good or bad? Indoor Air 2004; 14 (Suppl 7): 40–45 Cerca con Google

32. Tse W.L., So A.T.P., (2007). The Importance of Human Productivity to Air-Conditioning Control in Office Environments vol.13, n.4 HVAC&R RESEARCH Cerca con Google

33. Yi-Fu Tuan, (1974). Topophilia: A Study of Environmental Perception, Attitudes, and Values, Englewood Cliff NJ: Prentice-Hall Cerca con Google

34. Wang D., Zhang H., Arens E., Huizenga C., (2005). Time Series Observations of Upper- Extremity Skin Temperature and Corresponding Thermal Sensation. Proceedings: Indoor Air 2005 Cerca con Google

35. Zagreus L., Huizenga C., Arens E. and Lehrer D., (2004) Listening to the occupants: a Webbased indoor environmental quality survey, Indoor Air, 14, Issue s8, Page 65-74 Cerca con Google

36. Zhang, H., (2003) Human Thermal Sensation and Comfort in Transient and Non-Uniform Thermal Environments. Ph.D. Thesis, CEDR, University of California at Berkeley, pp 415 Cerca con Google

37. Zhang H., Arens E., Abbaszadeh Fard S., Huizenga C., Paliaga G., Brager G., Zagreus L., (2007) Air Movement Preferences Observed in Office Buildings International Journal of Biometeorology 51: 349-360 Cerca con Google

38. Wargocki P., Seppänen O., Andersson J., Boerstra A., Clements–Croome D., Fitzner K., Hanssen S., (2006) Indoor climate and productivity in office. How to integrate productivity in life–cycle cost analysis of building service, Rehva, Federation of European Heating and Air–conditioning Associations. Cerca con Google

39. Witterseh, T., Wyon D.P., Clausen G., (2004). The Effects of Moderate Heat Stress and Openplan Office Noise Distraction on SBS Symptoms and the Performance of Office Work. Indoor Air 14 (Suppl 8): 30 – 40.ù Cerca con Google

40. Zhang H., Kim D., Arens E., Buchberger E., Bauman E., Huizenga C., (2008) Study of comfort, perceived air quality and productivity with a highly-efficient task-ambient conditioning (TAC) system. Internal report, Center for the built environment Cerca con Google

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