000			03920cas|a2200421 a 4500
005			20260817162031.0
008			170399s1992 th uu|m rtt 0| a1eng d
035			_a.b10064643
099		9	_aAIT Thesis no. EV-92-12
100	1		_aNieh, Sheng-lin
245	1	0	_aAir quality control in tight office buildings
260			_aBangkok : _bAsian Institute of Technology, _c1992
300			_a141 p.
490	1		_aThesis ; _vno. EV-92-12
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1992
520			_aAfter working in tigh t buildings for several hours , many people suffer from headach e , fat i gu e or other discomfort . Th e causes of these symptoms are ambigu ous. Several typical air poll u tants were sel ected and studi ed to assess their accumul ation in tigh t buildings. A quantitative anal ysis of the h ou rly variation of indoor pollutants has been performed. The pollutants taken into account were carbon. diox ide from respiration , ozone from copying machines, s uspend e d particles from s moking, formalde hyde from furniture and carbon monoxide and nitrogen dioxide from gas appliances. Their hourly concentra tions under various conditi ons of room area, source strength and ventilation rates were found and tabulated . These tables can serve as a handbook in ventilation design . I n an offi ce with air inlet a nd outlet located adjacen tly each other at ceiling, the air change rate (ACR) should equal to 1.5 pe r hour to maintain t h e co2 concentration und e r 2500 ppm. Wh ile air inlet a nd outl e t are located far separately and the air mixin g is complete, the ACR can b e reduced to 1 per hour. I n a room with a n area o f 20 m2 h avi ng copy mach ine (s) operated 12 00 times per h o ur, t h e ozone concentration is within a llowable level after 4 ho urs continuo us operation. Local exhaust ventilation nearby the poll utant sou rce is more effective and e nergy efficient than dilution ventilation. The energy required for various conditions of air quality, ventil ation rates and mixing efficienci es have been calculated and tabulated . The most econ omical method for the indoor air qual ity improveme nt is to increase the mixin g efficiency i n a new building. For existing buildings , where the indoor air qu a lity is poor and the increasing of ventilation rate i s infeasible , re locating the a ir o u t l et to improve mixi n g effi c iency or starting ventilation before off ice-hour is a feasible method for the improvement of i nd oor air qu a lity.
650		0	_aAir quality management
650		0	_aAir _xPollution, Indoor
700	1		_aZhuang, Ya-Hui, _eChairperson
700	1		_aSchroder, Hans, _eExamination committee
700	0		_aSurapong Chiraratananon, _eExamination Committee
710	2		_aRetire-Service Engineering Agency (RSEA) Taiwan , Republic of China
810	2		_aAsian Institute of Technology. _tThesis ; _vno. EV-92-12
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B16643
907			_a.b10064643 _bmnait _cx
902			_a240409
998			_b2 _c951012 _dm _ea _fx _g0
945			_lmnait
945			_lmnait
945			_lmnarc
942			_c20
942			_c40
909			_aBarcode : 30050003046611 _bCREATED : 1994-05-16 _cRECORD # : i10061253 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
909			_aBarcode : 30050004535786 _bCREATED : 1994-05-16 _cRECORD # : i10061265 _dLPATRON : 1017407 _eLCHKIN : 2005-03-22 _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 6 _jTOT RENEW : 2
909			_aBarcode : 30050160056155 _bCREATED : 2016-11-05 _cRECORD # : i12974730 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
999			_c3596 _d3596