Temat: cooling efficiency - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Modelling of a thermoelectric self-cooling system based on thermal resistance networks for linear direct drives in machine tools
Autorzy:: Uhlmann, Eckart
Salein, Sebastian
Polte, Mitchel
Triebel, Florian
Powiązania:: https://bibliotekanauki.pl/articles/99421.pdf
Data publikacji:: 2020
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: legal restrictions
productivity
energy efficiency
thermoelectric generator
cooling
modelling
MATLAB/Simulink
Opis:: The use of direct drives in linear and rotary axes as well as increased power density of main drives offer the potential to raise feet rate, acceleration and thus allow higher productivity of machine tools. The induced heat flow rates of these drives could lead to thermo-elastic deformations of precision related machine tool components. In order to reduce thermally caused displacements of the tool-center-point and to prevent a negative impact on the achievable accuracy, the induced heat flow rates of main drives must be dissipated by effective cooling systems. These systems account for a major share of the machine tool’s total energy consumption.With the intention to overcome the area of conflict regarding productivity and energy efficiency, a so called thermoelectric self-cooling system has been developed. To convert a proportion of thermal losses into electrical energy, thermoelectric generators are placed in the heat flow between the primary part of a linear direct drive and the cooling system. The harvested energy is directly supplied to a pump of the water cooling circuit, which operates a decentralised cooling system with reasonable coolant flow rates. For predicting the thermoelectric system behaviour and to enable a model-based design of thermoelectric self-cooling systems, a thermal resistance network as a system simulation in MATLAB/Simulink is presented. The model is applied to a feed unit with a linear direct drive and allows the calculation of harvested energy as well as the simulation of steady and transient states of the cooling system. The comparison of simulative and experimental determined data indicates a predominantly high model prediction accuracy with short simulation times. At an early stage of development the model turns out to be a powerful tool for design and analysis of water flow thermoelectric self-cooling systems.
Źródło:: Journal of Machine Engineering; 2020, 20, 1; 43-57
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Natural ventilation and energy efficiency in non-domestic buildings
Autorzy:: Pieczara, J.
Powiązania:: https://bibliotekanauki.pl/articles/101474.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:: natural ventilation
adaptive thermal comfort
energy efficiency
air quality
passive cooling
risk of overheating
thermal mass
Opis:: Over the past 50 years the use of air conditioning in non-domestic buildings has become a norm and an indicator of status. Today the rediscovering of the natural ventilation is a part of rediscovering the buildings’ energy efficiency, or maybe even a part of a wider approach, which is a desire to be closer to nature. The main task of all ventilation systems is to maintain an appropriate indoor air quality and to improve the indoor environment. Natural ventilation systems could do the above using less energy than mechanical systems. However, it requires also the implementation of other passive measures. The most important of them are: the reduction of the harmful air contaminants, the control of heat gains, the exposition of the building’s thermal mass and utilisation of the night cooling. Because of energy efficiency and thermal comfort reasons, in temperate climate ventilation systems have to work according to at least three scenarios: spring/autumn, winter and summer. The thermal comfort parameters in naturally ventilated buildings are usually more variable than in air-conditioned ones, what does not mean that the occupants will experience thermal discomfort. Therefore, thermal comfort in passively ventilated buildings should be evaluated according to the adaptive comfort standard, appropriated for the naturally ventilated buildings. The natural ventilation has its limits and probably not all buildings can be ventilated naturally. From the energy efficiency and thermal comfort reasons, implementing the mixed mode systems is sometimes more feasible. However, the real reason why the full potential of natural ventilation could not be explored is very often the lack of confidence in relying exclusively on it.
Źródło:: Infrastruktura i Ekologia Terenów Wiejskich; 2017, III/1; 935-947
1732-5587
Pojawia się w:: Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Influence of Window Roller Blinds on Energy Consumption in Residential Buildings in Serbia
Autorzy:: Djoković, Jelena M.
Nikolić, Ružica R.
Bokůvka, Otakar
Pastorková, Jana
Powiązania:: https://bibliotekanauki.pl/articles/27323565.pdf
Data publikacji:: 2023
Wydawca:: Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:: exterior window blinds
heat load
cooling load
lighting
energy efficiency
rolety zewnętrzne
obciążenie cieplne
obciążenie chłodnicze
oświetlenie
efektywność energetyczna
Opis:: Roller blinds are devices that are retracted and wrapped in a box above the window opening and are used to protect against the solar radiation. Those are the well-known devices with distinct advantages over the fixed external dimming elements. The influence of external blinds on the internal thermal environment in climatic conditions in the Republic of Serbia, the city of Kragujevac, was considered in this research. An external blind was installed in the test room and its influence on the internal temperature was compared with the internal temperature of the room without the blind. Real-time monitoring was carried out in February and August 2023. The results presented in this paper show that the blind reduces the temperature in summer by 3.57ºC and increases it in winter by 1.76ºC. The cooling load can be reduced by about 20%, and the heat load by about 15%.
Źródło:: System Safety : Human - Technical Facility - Environment; 2023, 5, 1; 75-82
2657-5450
Pojawia się w:: System Safety : Human - Technical Facility - Environment
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Bibliometrics and scientometric review: perspectives and developments in the use of green roofs
Przegląd bibliometryczny i naukometryczny: perspektywy i rozwój w zakresie wykorzystania dachów zielonych
Autorzy:: Rzeszowska, Natalia
Powiązania:: https://bibliotekanauki.pl/articles/27313962.pdf
Data publikacji:: 2023
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: climate change
energy efficiency
green roofs
scientometric review
stormwater management
urban cooling
urban heat island
analiza naukometryczna
chłodzenie budynków
efektywność energetyczna
miejskie wyspy ciepła
zmiany klimatu
zagospodarowanie wody opadowej
dach zielony
Opis:: Green roofs are a multifunctional element of the building envelope, which, with appropriate modifications, can offer many benefits not only for its direct users, but also positively affect the environment around it. Global climate change and rapid urbanization have presented us with a number of urban challenges that negatively affect the physical and mental health of city dwellers. The subject of the article is to present the perspectives and main development trends in the use of green roofs in architecture. On the basis of the bibliometrics and scientometric analysis of the selected subject, the main research trends were presented, the countries contributing most to its development were distinguished, and the most influential authors were presented.
Dachy zielone to multifunkcyjny element obudowy budynku, który przy odpowiednich modyfikacjach może oferować wiele korzyści nie tylko dla jego bezpośrednich użytkowników, ale również pozytywnie wpływać na środowisko wokół niego. Globalne zmiany klimatyczne i szybka urbanizacja postawiły przed nami szereg wyzwań miejskich, które negatywnie wpływają na zdrowie fizyczne i psychiczne mieszkańców miast. Przedmiotem artykułu jest przedstawienie perspektyw oraz głównych nurtów rozwoju w zakresie wykorzystania dachów zielonych w architekturze. Na podstawie analizy bibliometrycznej i naukometrycznej wybranej tematyki, zaprezentowano główne nurty badań, wyodrębniono najbardziej przyczyniające się do jej rozwoju kraje oraz przedstawiono najbardziej wpływowych autorów.
Źródło:: Przestrzeń i Forma; 2023, 54; 98--120
1895-3247
2391-7725
Pojawia się w:: Przestrzeń i Forma
Dostawca treści:: Biblioteka Nauki

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