Eksperimentalna analiza slobodne konvekcije iznad čovjeka

undergraduate thesis

• Title (english): Experimental analysis of human thermal plume
• Author: Dora Helena Špiljar
• Mentor: Tea Žakula (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2023-03, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

Čovjek svojim metabolizmom generira toplinski tok uslijed kojeg nastaje uzgonsko gibanje zraka (eng. thermal plume), a koje utječe na raspodjelu temperature i strujanje zraka u zatvorenom prostoru. Ovaj se efekt najčešće analizira računalnim metodama, dok se točnost simulacijskih modela može ocijeniti usporedbom s eksperimentalnim mjerenjima. Svrha ovog rada je provesti eksperimentalno mjerenje u prostoriji na Fakultetu strojarstva i brodogradnje u Zagrebu koristeći pojednostavljene modele čovjeka, te usporediti dobivene rezultate s rezultatima CFD analize provedene u projektu „Regionalni centar kompetentnosti Ruđera Boškovića“. Pri tome je temperaturna stratifikacija iznad modela čovjeka ključan parametar za usporedbu rezultata mjerenja s računalnim simulacijama. Najviša temperatura izmjerena je neposredno iznad modela (oko 27°C), a uočen je i ustaljen temperaturni gradijent. Također je utvrđeno da se najveća temperaturna razlika između rezultata mjerenja i simulacije pojavljuje uz sami model i iznosi 2°C, dok je na ostalim lokacijama mjerenja razlika temperatura zanemariva. U zaključku, usporedbom rezultata mjerenja s rezultatima CFD simulacije zaključeno je da korišteni pojednostavljeni model čovjeka daje rezultate prihvatljive točnosti te da se može koristiti za daljnja eksperimentalna mjerenja.

Abstract (english)

Human metabolism generates a heat flow that creates a thermal plume, which then affects
the temperature distribution and air flow in a closed space. A variety of computer programs
are used to analyze the effects, while simulation models can be validated using experimental
measurements. The goal of this work is to conduct an experiment in a room at the Faculty of
Mechanical Engineering and Naval Architecture in Zagreb using simplified human models,
and to compare the obtained results with the results of the CFD analysis carried out in the
project "Regional Competence Center Ruđer Bošković". The key parameter for the
comparison of the experimental results with the simulation results was the temperature
stratification above the human model. The highest temperature in the experiment was
measured directly above the model (around 27°C). Also, there was a notable temperature
gradient above the model. The biggest temperature difference between the measured and
simulated results was closest to the model and is equal to 2°C. On other locations the
temperature difference was negligible. By comparing the results of the experiment and CFD
simulation, it was concluded that using simplified human models in the experiment gives
results of acceptable accuracy and that the models can be used for further experimental
measurements

• Keywords: strujanje zraka u prostoru; model čovjeka; eksperimentalno mjerenje; temperaturni profil; mjerna nesigurnost
• Keywords (english): airflow in a closed space; human model; experimental measurement; temperature profile; measurement uncertainty
• Language: croatian
• URN:NBN: urn:nbn:hr:235:421066
• Study programme: Title: Mechanical Engineering; specializations in: Design, Process and Energy Engineering, Production Engineering, Engineering Modelling and Computer Simulation, Marine Engineering, Industrial Engineering and Management, Materials Engineering; Course: Process and Energy Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Repository: Repository of Faculty of Mechanical Engineering and Naval Architecture University of Zagreb
• Created on: 2023-02-28 09:30:21