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Analitična določitev srednje sevalne temperature zapletene geometrijske oblike prostora
Prek, Matjaž (Author), Novak, Peter (Author)

URLURL - Presentation file, Visit http://www.dlib.si/details/URN:NBN:SI:doc-RUADGM8X This link opens in a new window

Abstract
Sevalne toplotne izgube pomenijo sestavni del toplotnega ravnotežja človeka v prostoru. Pravilna določitev sevalnega toplotnega toka je potrebna za oceno vpliva tega parametra na toplotno ugodje. Toplotno ravnotežje je odvisno predvsem od površinskih temperatur in kotnega faktorja med človekom in površinami prostora. Ker so notranje površine sestavljene iz različnih elementov, je izračun kotnega faktorja zahteven. V tem primeru pomeni računalniški program primerno orodje za izračun sevalnih toplotnih tokov, predvsem za zapleteno sestavljene površine, kakršne so v dejanskih razmerah. Predstavljeni algoritem temelji na izračunu kotnih faktorjev, pri čemer je upoštevan zakon seštevnosti. Postopek izračuna omogoča določitev kotnih faktorjev za sestavljene površine in s tem upoštevanje zapletenega vpliva kotnih faktorjev na sevalni toplotni tok, kakršen je npr. pri sedeči osebi in znani usmeritvi. Matrično zasnovan postopek omogoča določitev vpliva različnih parametrov na srednjo sevalno temperaturo.

Language:Slovenian
Work type:Not categorized (r6)
Tipology:1.02 - Review Article
Organization:FS - Faculty of Mechanical Engineering
Year:2000
Publisher:Association of Mechanical Engineers and Technicians of Slovenia et al.
Number of pages:str. 494-502
Numbering:Letn. 46, št. 8
UDC:536.3:536.2:697.97
ISSN on article:0039-2480
COBISS.SI-ID:4093211 Link is opened in a new window
Views:414
Downloads:95
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Record is a part of a journal

Title:Strojniški vestnik
Shortened title:Stroj. vestn.
Publisher:Zveza strojnih inženirjev in tehnikov Slovenije [et al.], = Association of Mechanical Engineers and Technicians of Slovenia [et al.]
ISSN:0039-2480
COBISS.SI-ID:762116 This link opens in a new window

Secondary language

Language:English
Title:An analytical determination of the mean radiant temperature for a complex room geometry
Abstract:
Radiative heat losses represent a substantial part of the total balance of the human body in a closed space. The correct determination of this contribution is necessary in order to gain an insight into the influence of this parameter on human thermal comfort. The thermal balance is strongly affected bysurface temperatures and by the angle factor between a body and a wall surface. Since a room's internal surfaces are composed of various parts, the calculation of view factors becomes more complex. Therefore, a computer algorithm is a useful tool for determining the radiant heat exchange, particularly for the complex surface compositions, encountered in practical situations. The proposed algorithm is based on the computation of view factors, which are additive. This algorithm enables the computation of view factors for composite surfaces, thus allowing for the complex impact of view factors on thermal radiative heat exchange, as is the case for the seated posture and other orientations of the human body. The matrix-based approach makes it possible to determine the influence of various parameters on the mean radiant temperature.

Keywords:thermal comfort, heat transfer, radiation, radiant temperature

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