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    Wyświetlanie 1-9 z 9
    Tytuł:
    Wind aspects in built environment
    Autorzy:
    Klemm, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/27314361.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    wind
    urban structures
    comfort
    heat loss
    Opis:
    The dynamic development of built-up areas observed in the last few decades resulted in strong environmental transformations, especially in terms of climate phenomena. One of the factors which significantly affects the climate and bioclimate of urban areas is wind. Wind can cause discomfort to pedestrians or heat loss in buildings, if the wind speed around buildings is too high. The paper presents two examples of research conducted by the author, related to the issues of wind flow in built-up areas, based on the numerical simulations. The numerical simulations become an increasingly frequently used tool to determine the wind climate. Simulation results provide designers with important information on the influence of the buildings and their layout on the local changes in airflow. They allow testing of alternative solutions and effectiveness of various remedial measures.
    Źródło:
    Budownictwo i Architektura; 2022, 21, 3; 19--34
    1899-0665
    Pojawia się w:
    Budownictwo i Architektura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat Stress Analysis Using the Discomfort Index Method: Impact on Macro Environmental in Yogyakarta
    Autorzy:
    Nurmaya, E. M.
    Abidin, A. U.
    Hasanah, N. A. I.
    Asmara, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2025782.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    discomfort index
    environmental assessment
    heat stress
    impact heat stress
    thermal comfort
    Yogyakarta
    Opis:
    A growing urban development pattern can have both positive and negative impacts. One of them is the thermal discomfort in the form of heat stress. Heat stress is the maximum condition of the human body to receive the heat exposure to various activities. This study analyzed the thermal comfort in Yogyakarta City based on the Discomfort Index (DI) method. The DI method is commonly used in tropical climates using the parameters that include average air temperature and humidity. The data consists of secondary data obtained from Geophysics Station Gamping in 2004-2020 and Climatology Station Mlati in 2017-2020. The result of DI indicated that the highest value occurred in the wet moon climate type in April, with 25.63 °C. Therefore, the conditions showed that more than 50% of people in the city of Yogyakarta fall into an uncomfortable category with an average index of 24.97 °C, which can lead to heat stress. Environmental engineering can be employed to decrease the heat stress potential and improve the thermal comfort for Yogyakarta’s urban community, which is public and private open space, plant road shade vegetation, implement a green façade (vertical garden), as well as improve people’s living behavior and use appropriate clothing.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 1; 286-295
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the heat pump for a passenger electric vehicle based on refrigerant R744
    Autorzy:
    Canteros, Maria Laura
    Polansky, Jiri
    Powiązania:
    https://bibliotekanauki.pl/articles/2091374.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    R744 (CO2)
    heat pump
    battery electric vehicle
    thermal comfort
    Opis:
    Energy management plays a crucial role in cabin comfort as well as enormously affects the driving range. In this paper energy balances contemplating the implementation of a heat pump and an expansion device in battery electric vehicles are elaborated, by comparing the performances of refrigerants R1234yf and R744, from –20◦C to 20◦C. This work calculates the coefficient of performance, energy requirements for ventilation (from 1 to 5 people in the cabin) and energy required with the implementation of a heat pump, with the employment of a code in Python with the aid of CoolProp library. The work ratio is also estimated if the work recovery device recuperates the work during the expansion. Comments on the feasibility of the implementation are as well explicated. The results of the analysis show that the implementation of an expansion device in an heat pump may cover the energy requirement of the compressor from 27% to more than 35% at 20◦C in cycles operating with R744, and from 15% to more than 20% with refrigerant R1234yf, considering different compressor efficiencies. At –20◦C, it would be possible to recuperate between around 30 and 24%. However, the risk of suction when operating with R1234yf at ambient temperatures below –10◦C shows that the heat pump can only operate with R744. Thus, it is the only refrigerant that achieves the reduction of energy consumption at these temperatures.
    Źródło:
    Archives of Thermodynamics; 2022, 43, 2; 17--36
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal comfort study of plastics manufacturing industry in converting process
    Autorzy:
    Sugiono, S.
    Novareza, O.
    Fardian, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/887005.pdf
    Data publikacji:
    2017
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    thermal comfort
    plastics manufacturing industry
    converting process
    ergonomics
    work performance
    heat stress
    Indonesia
    Opis:
    Thermal comfort study of plastics manufacturing industry in converting process. Thermal comfort is one of ergonomics factors that can create a significant impact to workers performance. For a better thermal comfort, several environment factors (air temperature, wind speed and relative humidity) should be considered in this research. The object of the study is a building for converting process of plastics manufacturing industry located in Malang, Indonesia. The maximum air temperature inside the building can reach as high as 36°C. The result of this study shows that heat stress is dominantly caused by heat source from machine and wall building. The computational fluid dynamics (CFD) simulation is used to show the air characteristic through inside the building. By using the CFD simulation, some scenarios of solution are successfully presented. Employees thermal comfort was investigated based on predicted mean vote model (PMV) and predicted percentage of dissatisfied model (PPD). Existing condition gives PMV in range from 1.83 to 2.82 and PPD in range from 68.9 to 98%. Meanwhile, modification of ventilation and replacing ceiling material from clear glass into reflective clear glass gave significant impact to reduce PMV into range from 1.63 to 2.18 and PPD into range from 58.2 to 84.2%. In sort, new design converting building process has more comfortable for workers.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2017, 26, 3[77]
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potential influence of urban sprawl and changing land surface temperature on outdoor thermal comfort in Lagos State, Nigeria
    Autorzy:
    Obiefuna, Jerry N.
    Okolie, Chukwuma J.
    Nwilo, Peter C.
    Daramola, Olagoke E.
    Isiofia, Lawrence C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1050781.pdf
    Data publikacji:
    2021-03-31
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Landsat imageries
    land cover changes
    heat stress
    outdoor thermal comfort
    universal thermal climate index
    Opis:
    The continuous monitoring of the relationship between land surface temperature (LST) and land cover change is imperative for an inquiry into the potential impact of LST on human well-being, including urban outdoor thermal comfort in Lagos State, Nigeria. Using Landsat imagery, this study assessed land cover and LST changes from 1984 to 2019. Land cover was extracted, LST was determined from Landsat imageries and the land cover changes were linked to LST using the contribution index (CI). Afterwards, the universal thermal climate index (UTCI) was calculated to determine the heat stress levels. Findings confirm the presence of urban sprawl and new growth areas in previously rural Local Government Areas (LGAs) eastward, northward and westward of Lagos metropolis and in regions which lie on the fringe of the state’s border with Ogun State. Also, a very strong link between high LST intensities and increasing concentration of urban areas in rapidly growing LGAs has been observed. This link further confirms the increased warming of the state, with an increase in mean LST of 2.16°C during 1984–2019. The UTCI which was used to gauge the influence of LST on outdoor thermal comfort ranged from moderate to strong heat stress levels. This study helps to strengthen the case for definite policies and actions which should be aimed at achieving moderate urban development through increased urban tree canopy/green infrastructure provision and carbon sequestration activities in urban design/landscape design, in Lagos State.
    Źródło:
    Quaestiones Geographicae; 2021, 40, 1; 5-23
    0137-477X
    2081-6383
    Pojawia się w:
    Quaestiones Geographicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of the Moisture and Heat Transfer Rate in Light-weight Nonwoven Fabrics Using an Intelligent Model
    Badanie szybkości przepływu wilgoci i ciepła przez włókniny o niewielkiej masie powierzchniowej korzystając z modelu teoretycznego
    Autorzy:
    Rahnama, M.
    Semnani, D.
    Zarrebini, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/234047.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    nonwovens
    moisture transfer
    heat transfer
    comfort
    neural network
    włókniny
    transfer wilgoci
    przepływ ciepła przez włókniny
    komfort
    sieci neuronowe
    Opis:
    In this paper, an intelligent model of heat and moisture propagation in light nonwoven fabrics was designed by conversion of a numerical propagation model of a partial differential equation to a feed forward propagation neural network. Propagation coefficients of heat and moisture transfers were estimated from the intelligent model for nonwoven samples containing hydrophilic natural and hydrophobic synthetic fibres. The results presented that the error of the model is acceptable less than 4.7% and 7.9% for estimation of heat and moisture diffusivity coefficients, respectively. The Anova test revealed that while fibre type and fabric thickness affected heat and moisture transfer through the fabric, factors such as surface mass density, heat and the moisture transfer constant were not significant. Also it was found that the optimum transfer rate was observed in the case of samples containing viscose or a viscose and polypropylene blend in the ratio of 60%:40%, respectively.
    Inteligentny model przepływu wilgoci i ciepła przez włókniny o małej masie powierzchniowej został opracowany dla zasilania sztucznych sieci neuronowych na podstawie modelu numerycznego cząstkowych równań różniczkowych. Badano włókniny zawierające włókna hydrofobowe i hydrofilowe. Stwierdzono, że dokładność modelu jest akceptowalna dla modelu rozpatrywanych włókien. Test Anova wykazał, że rodzaj włókna i grubość włókniny wpływają na przepływ ciepła i wilgoci przez włókninę. Stwierdzono, że dla próbek zawierających wiskozę lub mieszankę wiskozy i polipropylenu w stosunku 60%:40% uzyskano optymalne prędkości przepływu.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2013, 6 (102); 89-94
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on the Solar Radiation and Heat Transfer of Cabin Fabric Using the Finite Volume Method
    Badanie promieniowania słonecznego i przenoszenia ciepła przez tkaniny kabinowe przy użyciu metody objętości skończonych
    Autorzy:
    Zhang, Yijie
    Jia, Juhong
    Powiązania:
    https://bibliotekanauki.pl/articles/1419824.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    cabin textile
    heat transfer
    solar radiation
    thermal comfort
    numerical simulation
    tekstylia kabinowe
    przenikanie ciepła
    promieniowanie słoneczne
    komfort cieplny
    symulacja numeryczna
    Opis:
    The heat transfer of different fabrics was investigated numerically in the cabin of an aircraft. The discrete ordinate (DO) radiation model was adopted to describe the solar radiation through the cabin window and the fabric’s reflection. The conjugate heat transfer between the air flow and the seat fabric was included to study the influence of the textile type and fabric thickness. Some important parameters such as the temperature, radiative heat flux, and heat transfer coefficient on the fabric surface were evaluated. The results showed that both altering of the textile type and thickness will bring about the variation of temperature on the cushion surface. The carbon fibre yarn seat and thinner padding fabric provide a much more enjoyable environment than others. The air circulation in the cabin can improves the thermal environment to some degree.
    W pracy zbadano przenikanie ciepła różnych tkanin stosowanych w kabinie samolotu. Do opisu promieniowania słonecznego wpadającego przez okno kabiny i odbicia tkaniny został przyjęty model promieniowania na osi rzędnych dyskretnych (DO). Zbadano wpływ rodzaju tkaniny i grubości tkaniny uwzględniając przenoszenie ciepła koniugatu między przepływem powietrza a tkaniną siedziska. Oceniono niektóre ważne parametry, takie jak: temperatura, strumień ciepła promieniowania i współczynnik przenikania ciepła na powierzchni tkaniny. Wyniki pokazały, że zarówno zmiana rodzaju, jak i grubości tkaniny powoduje zmianę temperatury na powierzchni poduszki. Stwierdzono, że siedzisko z włókna węglowego i cieńsza tkanina wyściełająca zapewniają znacznie przyjemniejsze środowisko, a cyrkulacja powietrza w kabinie może w pewnym stopniu poprawić warunki termiczne.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2021, 2 (146); 41-47
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of human thermal comfort and heat stress in an outdoor urban setting in summer under arid climatic conditions
    Autorzy:
    Abdel-Ghany, A. M.
    Al-Helal, I. M.
    Shady, M. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/950038.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    arid regions
    sensory perception
    thermal comfort
    climatic conditions
    effective temperature
    human thermal comfort
    solar-radiation fluxes
    thermal stress
    heat stress
    suchy klimat
    percepcja sensoryczna
    komfort cieplny
    warunki klimatyczne
    temperatura efektywna
    komfort cieplny człowieka
    strumienie promieniowania słonecznego
    stres termiczny
    stres cieplny
    Opis:
    Thermal sensation and heat stress potential were evaluated in summer in an outdoor arid environment. Such evaluation had never been made in arid regions. Various scales: the temperaturehumidity index (THI), physiological effective temperature (PET), universal thermal climatic index (UTCI) and standard effective temperature (SET*) were used for the evaluation. RayMan software model was used to estimate the PET and SET* and the UTCI-calculator was used for UTCI. The required air dry and wet bulb temperatures (Td, Tw), solar radiation flux (S0) and wind speed (V) were measured in summer (April 29–July 15). The results showed that: Persons are exposed to strong heat stress and would feel very hot most of the day time; and they are safe from heat stress risk and would feel comfortable most of the night time. Heat stress levels can be determined using the PET or UTCI scales; both are valid for arid environment and their results are almost similar; however, the THI cannot be used. SET* index specifically describes the thermal sensations and discomfort conditions along with summer days at any activity under arid conditions.
    Źródło:
    Environment Protection Engineering; 2014, 40, 3; 139-150
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical investigations of effect of indoor air quality on thermal comfort in residential buildings
    Autorzy:
    Krzaczek, M.
    Tejchman, J
    Powiązania:
    https://bibliotekanauki.pl/articles/231320.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    budynek mieszkalny
    jakość powietrza wewnętrznego
    stężenie CO2
    komfort cieplny
    CFD
    strefa oddychania osobista
    obciążenie cieplne
    wentylacja naturalna
    residential building
    indoor air quality
    CO2 concentration
    thermal comfort
    personal breathing zone
    heat load
    natural ventilation
    Opis:
    The influence of the CO2 concentration in a local air zone in naturally ventilated residential houses on the residents’ behaviour was numerically investigated. A numerical two-dimensional CFD model of the indoor zone based on experiments performed by the authors was used. Different resident locations in the fluid domain and different inlet velocities imposed by wind were considered in simulations. The overall thermal comfort and IAQ indices were also calculated. The investigations results show that in contrast to the overall air quality, the local CO2 was strongly dependent upon the resident location, fresh air inlet velocity and ventilation system type.
    Źródło:
    Archives of Civil Engineering; 2014, 60, 1; 91-121
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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