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3 Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

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Vpliv povihtroobmezhnika na pihdvishhennja efektivnostih ventiljacihjjnogo zonta

100%

Dovbush O. , Zhukovskijj S.

2004

tom z. 37[211], cz.2

59-66

In this article the analysis of existing types of ventilating umbrellas and results of experimental researches of ventilating umbrella with airlimiter and cylindrical board are presented. Ventilating umbrella sucking zone increasing at airlimiter presence is marked.

Air distribution and air jet's acoustic properties

100%

Dovbush O. , Jelykh V.

2000

tom z. 32[180], cz.2

43-47

Relation between such factors as a noise level, air flow rate and incoming hole size were considered. The aim of investigations is to obtain the chart and analytic equations for determination of the necessary incoming hole size (diameter or width and height) under condition of the necessary amount of air satisfaction at the rated noise level. Experimental research of the acoustic phenomena at the air jets leakage from flat and round outlets was carried out in room 12,0x6,0x3,0 (h) m. Air was supplied at the various flow rate both through a flat incoming hole by variable width (200 - 600mm), height (10 - 60mm) and through a round outlet by various diameter (100 - 400mm). Air exhaust was realised through a side hole by diameter 250mm in a wall under a ceiling. Measurement of the air jet's velocity was made by thermoelectrical anemometer TA-9 at its numbers 0—5m/s. The noise level was measured by noisemeter SHM-1-MI and vibration of air pipes' metal walls - by vibrometer DN-3-MI. Three noise sources were taken into account, namely: fan, vibration of air pipes' metal walls and aerodynamic noise at the air jet's leakage. For obtaining universal calculating equations width, height and diameter of the outlets were expressed as sizeless. Air jet's initial velocity Vo at leakage from different size and shape incoming holes, noise level and vibration of air pipes' metal walls have been measured; the chart, that shows relation between such factors as a noise level, air flow rate and incoming hole's size of both shapes (flat and round), has been created; obtained chart has been approximated by equation for analytic calculation. Represented data gives a possibility to determine air distribution units' size under maintenance of the rated noise level, when necessary air amount is supplied, and is considered as a base for designing air conditioning system.

Influence of indoor climate on a person heat exchange in a room

100%

Vozniak O. , Dovbush O.

2000

tom z. 32[180], cz.2

441-447

In this article there are presented results of theoretical investigations, which concern relationship between a person heat exchange and microclimatic parameters in a room. By this metabolic heat (person work intensity), clothes heat isolation properties, room temperature and air velocity were taken into acount. On a base of this research an universal comfort diagram (3-factor's chart) has been created and calculating equation has been obtained. Presented diagram and equation give possibility to calculate an air velocity needed for a person comfort heat feeling, which is an input data for designing air conditioning system.