Experimentally Measured Boundary and Initial Conditions for Simulations

Katunský, Dušan; Zozulák, Marek; Vertaľ, Marián; Šimiček, Jozef

doi:10.4028/www.scientific.net/amr.1041.293

Cited by 12 publications

(8 citation statements)

References 4 publications

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“…Within the campus, there are several weather stations [27] of various quality, locations, measured climate parameter, etc. Also another universities use own weather stations nowadays, to increase the accuracy of comparison [1,4]. Highlight is the special system of 36 façade meteorological stations on the building of Research centre [28] for monitoring the climate around the building façade.…”

Section: Weather Stationmentioning

confidence: 99%

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Urban Heat Island: Summer Outdoor Climate Measurement Within the University Campus and City

Juráš

2021

Civil and Environmental Engineering

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Work of researchers from various areas is focused on problematics of urban heat islands. Its importance is rising with the global climate change. The difference of the air temperatures within the area can be also caused by the measurement error. Usual error is not the accuracy of the sensor, but the radiation shield or location of the weather station. In this case, averaged difference can be up to 80 %. Difference of temperatures between the weather stations within the analyzed area can vary from 0.2 up to 6 °C. Difference depends usual on the size of the city and the location influenced by the surrounding geomorphology. In this paper three different radiation shields are compared which influenced the measurement and analyzed are also the results from four different weather stations, two of them are within the University of Zilina campus. One of them is placed on the roof, which is a usual location for the solar radiation measurement; the second one is placed on the grass land at the end of the campus. Other two stations belong to the national weather institute. Comparison is made for two very hot days of August 2020. Averaged difference was 0.3 °C for the whole month and 0.5 °C for selected days.

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Section: Weather Stationmentioning

confidence: 99%

“…Not only detailed outdoor boundary conditions [1-3], but also the material properties of used materials [3][4][5][6] and the used simulation tool and appropriate model from vast selection are important [7]. Several works deal with the accuracy of used outdoor climate [1,2,6,7]. Outdoor climate is highly influenced by existence of the urban heat island (UHI).…”

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confidence: 99%

Urban Heat Island: Summer Outdoor Climate Measurement Within the University Campus and City

Juráš

2021

Civil and Environmental Engineering

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“…Numerical analysis of the thermal field validated by experimental measurement is used to recognize the true heat behavior and moisture transfer in different kind of structures. Those analyses have been published in literature [22][23][24][25][26][27].…”

Section: Measurement Experimental Test Setupmentioning

confidence: 99%

The Influence of the Initial Condition in the Transient Thermal Field Simulation Inside a Wall

Zozulák¹,

Vertaľ²,

Katunský³

2019

Buildings

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The envelope structures of buildings are exposed to heat-humidity conditions. The heat and humidity flow through these structures depends on the boundary conditions of the indoor and outdoor environments. This paper shows different initial conditions for the determination of temperature spread. The aim is to bring certain results of temperature calculated considering the initial conditions. When temperature changes, heat flow also rapidly changes. In certain specific cases, it is necessary to consider the initial conditions of temperature—for example; when transient energy simulations of real buildings are carried out. The reasons as to why it is necessary to consider the initial conditions, are shown in the examples of one-layer assemblies. The test walls exposed to the transient hygrothermal conditions are placed in the outdoor test cell. The cell has a stable temperature and relative humidity, and outdoor weather conditions change. The measured data on these walls and the calculated values of the temperatures in the wall structure, according to the different initial conditions, are compared. The average difference of the mean by the simulation and the measured values is significant. For a simulation time of about five days, the initial condition for calculating the temperature in the center of the masonry is necessary.

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“…The various opaque and transparent envelope parts were monitored -temperature and relative humidity inside the structure, surface temperature and heat flux, simultaneously with exterior and interior environment conditions [10]. The experiment has been carried out on the autoclaved aerated concrete (AAC) and ceramic bricked envelope structure.…”

Section: Methodsmentioning

confidence: 99%

Numerical and experimental determination of in-structure temperature profiles

Zozulák

Katunský

2015

Selected Scientific Papers - Journal of Civil Engineering

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When building physics simulations are done initial conditions express the actual hygrothermal state of building envelope. For the temperature field simulations initial condition is represented by the initial temperature in the body profile at the start of heat transfer. In-structure temperature varies quickly so temperature initial conditions are often neglected. Nevertheless in specific cases initial conditions have to be taken into an account even when simple temperature field simulations are done. The contribution shows various temperature initial conditions determination for insulated construction of outdoor test cell. Comparison of measured and calculated temperature profiles in structure shows correctness of start-up pre-calculation initial condition consideration.

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Experimentally Measured Boundary and Initial Conditions for Simulations

Cited by 12 publications

References 4 publications

Urban Heat Island: Summer Outdoor Climate Measurement Within the University Campus and City

Urban Heat Island: Summer Outdoor Climate Measurement Within the University Campus and City

The Influence of the Initial Condition in the Transient Thermal Field Simulation Inside a Wall

Numerical and experimental determination of in-structure temperature profiles

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