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Wyszukujesz frazę "Michalak, Piotr." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Thermal - electrical analogy in dynamic simulations of buildings: comparison of four numerical solution methods
Autorzy:
Michalak, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/1819185.pdf
Data publikacji:
2020
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
thermal-electrical analogy
RC network
lumped capacitance
BESTEST
Euler method
Heun's method
analogia termiczna
analogia elektryczna
metoda Eulera
Opis:
The lumped capacitance method is widely used in dynamic modelling of buildings. Models differ in complexity, solution methods and ability to simulate transient behaviour of described objects. The paper presents a mathematical description of a simple 1R1C thermal network model of a building zone. Four numerical methods were applied to solve differential equation describing its dynamics. For validation purposes two test cases (600 and 900) from the BESTEST procedure were used. In both cases detailed results were given. Better ability of the simulation model to reproduce transient behaviour of the modelled buildings was noticed in case of the lightweight object (case 600). Annual heating and cooling demand was within the reference range for heavyweight one (case 900). The kind of the computation method had no significant effect on simulation results.
Źródło:
Journal of Mechanical and Energy Engineering; 2020, 4, 2; 179--188
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ventilation heat loss in a multifamily building under varying air density
Autorzy:
Michalak, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/95344.pdf
Data publikacji:
2020
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
air density
heat capacity
dry air
volumetric heat capacity
ventilation heat loss
EN ISO 13790
monthly method
gęstość powietrza
pojemność cieplna
suche powietrze
objętościowa pojemność cieplna
wentylacyjna strata ciepła
Opis:
Standards related to calculation methods used in building energy performance simulation tools usually impose constant volumetric heat capacity of air. However, this simplification may result in errors if the actual conditions differ from the assumptions made. The paper presents the problem of dry air density and specific heat capacity variation and their influence on calculated energy use for space heating in a multifamily building. The monthly calculation method of PN-EN ISO 13790 was used. Simulations were performed in five cities, each in one climatic zone according to PN-EN 12831. Variation of the air density caused by air temperature and elevation resulted in differences in calculated heating demand from -4.5% to 4.5% in relation to that at constant volumetric heat capacity assumed in PN-EN ISO 13790.
Źródło:
Journal of Mechanical and Energy Engineering; 2020, 4, 1; 97-102
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature efficiency of heat exchangers in air handling units
Autorzy:
Michalak, Piotr
Grygierczyk, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/95368.pdf
Data publikacji:
2019
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
ventilation
heat recovery
rotary heat exchanger
cross-flow heat exchanger
temperature efficiency
PN-EN 308
wentylacja
odzysk ciepła
obrotowy wymiennik ciepła
krzyżowy wymiennik ciepła
sprawność temperaturowa
Opis:
In order to reduce ventilation heat loss and improve energy efficiency of low-energy buildings air-handling units (AHUs) with heat recovery are used. The article presents results of surveys performed in a passive building located in Katowice concerning the temperature efficiency of heat and cold recovery of two selected AHUs, with different heat exchangers. For this purpose the measurement data from the Building Management System (BMS) for the period 1.08.2015-31.07.2016 were used. The first unit was equipped with a rotary heat exchanger. Its average annual temperature efficiency of heat recovery was 47.2% annually. The efficiency of cold recovery amounted 52.9% on average for the warm half year. The second unit had a cross-flow exchanger. The average annual temperature efficiency of heat recovery in this device was 80.1%. The efficiency of cold recovery amounted 57.2% on average for the warm half year. Additional remarks concerning the temperature measurement in analysed units were also given.
Źródło:
Journal of Mechanical and Energy Engineering; 2019, 3, 3; 267-272
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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