Eksperimentalno-numerička analiza toplinske ugodnosti kod korištenja podnih konvektora

Tomorad, Jura (2017) Eksperimentalno-numerička analiza toplinske ugodnosti kod korištenja podnih konvektora. = Experimental and numerical analysis of the thermal comfort using the floor standing convector. Master's thesis (Bologna) , Sveučilište u Zagrebu, Fakultet strojarstva i brodogradnje, UNSPECIFIED. Mentor: Dović, Damir.

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Abstract (Croatian)

Novi standardi za računanje energetskih performansi zgrada temeljeni su na sobnoj operativnoj temperaturi umjesto temperaturi zraka u računanju energetskih potreba. Operativna temperatura kao reprezent toplinske ugodnosti funkcija je temperature zraka, srednje temperature zračenja i brzine strujanja zraka u prostoriji. Postupak proračuna operativne temperature opisan je u normi EN ISO 7726:1998. U ovom radu, temperatura zraka i zidova u prostoriji određena je eksperimentalno za konvektor i radijator u kontroliranim uvjetima. Temperatura zraka mjerena je u nekoliko točaka u prostoru na visinama 0,75 m te 1,5 m od poda koristeći termoparove tipa T. Temperature zidova određene su iz termograma snimljenih infracrvenom termokamerom. Svaki od zidova podijeljen je u manje sekcije s približno istim temperaturama. Za te sekcije, vidni faktori korišteni za proračun srednje temperature zračenja određivani su numerički. Toplinski učin testiranih ogrjevnih tijela određen je prema HRN EN 442-2:2014. Dobiveni rezultati su uspoređivani te su doneseni zaključci o toplinskoj ugodnosti.

Abstract

The new standards, for calculation of energy performance of buildings, which are under public enquiry, deal with the room operative temperature instead of the indoor air temperature in calculations of building energy needs. The operative temperature, as a representative of thermal comfort, is a function of the air temperature, the mean radiant temperature and the relative air velocity. Calculation of operative temperature is described in EN ISO 7726:1998. In this paper, the room air and wall temperature distribution was determined experimentally for floor-standing convector and conventional radiator at controlled room conditions. The room air was continuously measured at several positions and heights (0,75 m and 1,5 m) using calibrated T-type thermocouples. The wall temperatures were obtained from thermograms captured by the IR thermal camera. Each wall was divided into several sections with approximately similar temperatures. For these sections, the view factors used in determination of the mean radiant temperature were obtained numerically. The thermal capacity of the tested heat emitters is determined according to HRN EN 442-2:2014. Obtained results were analysed and conclusions about the achieved thermal comfort were made accordingly.

Item Type: Thesis (Master's thesis (Bologna))
Uncontrolled Keywords: Srednja temperatura zračenja; operativna temperatura; toplinska ugodnost; termografija; ogrjevna tijela
Keywords (Croatian): Mean radiant temperature; operative temperature; thermal comfort; thermography; heat emitters
Subjects: TECHNICAL SCIENCE > Mechanical Engineering > process energy engineering
Divisions: 300 Department of Thermodynamics, Thermal and Process Engineering > 320 Chair of Thermal and Process Engineering
Date Deposited: 13 Jul 2017 10:53
Last Modified: 26 Jul 2017 12:30
URI: http://repozitorij.fsb.hr/id/eprint/7844

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