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Wyświetlanie 1-4 z 4
Tytuł:
Badanie dynamiki wymiany ciepła przy zastosowaniu technik filmowych
Investigation of heat exchange dynamics using film techniques
Autorzy:
Piotrowska, E.
Chochowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/288087.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
smugoskop
wymiana ciepła
wymiennik ciepła
techniki filmowe
streak camera
heat exchange
heat exchanger
film technique
Opis:
W celu modelowania sieci hybrydowego układu zasilanego źródłami energii odnawialnej tworzony jest schemat zastępczej sieci cieplnej, składającej się z elementów obwodu elektrycznego, odpowiadających - przy zastosowaniu analogii termoelektrycznej elementom rzeczywistym. Prowadzone są prace nad stworzeniem modelu wymiennika ciepła, których fragmentem są eksperymenty nad elementami modelującymi wymiennik ciepła: element aktywny nagrzewa element pasywny poprzez medium, jakim jest powietrze. W opisanym fragmencie prowadzonych prac zastosowano smugoskop do zbadania pól temperatury, tworzących się w otoczeniu badanych elementów i pomiędzy nimi. Zaobserwowano zjawisko wzajemnego przekazywania sobie energii między elementem aktywnym i pasywnym, a ponadto intensywny ruch konwekcyjny, a więc w efekcie pole temperatur wewnątrz nagrzewanej spirali i nad jej centrum.
In order to model hybrid network of the system supplied with renewable energy sources, a new scheme of a substitutive heating network, composed of electric circuit elements, similar at use to thermoelectric analogy, real elements, is formed. Works on creating a heat exchanger model are carried out. Experiments on elements which model a heat exchanger constitute a part of these works: an active element heats a passive element through a medium, that is air. In the described part of the works, a streak camera was used to investigate temperature fields which form around the researched elements and between them. Mutual transfer of energy between an active and a passive element as well as intense convective movement were reported. Therefore, as a consequence, a temperature field inside the heated spiral and over its centre was reported.
Źródło:
Inżynieria Rolnicza; 2012, R. 16, nr 4, t. 1, 4, t. 1; 331-337
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novye shemy i osobennosti rabocego processa gazoturbinnyh dvigatelej na baze kaskadnogo obmennika davleniem
New patterns and peculiarities of the gas turbine working process on the base of cascade pressure exchanger
Autorzy:
Krajniuk, A.
Klyus, O.
Powiązania:
https://bibliotekanauki.pl/articles/359115.pdf
Data publikacji:
2012
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
cascade pressure exchanger
gas turbine
heat exchanger
energy exchange
cascade exchange
circuit’s maximum temperature
Opis:
The paper describes the main directions of gas turbines improvement in terms of application of the cascade pressure exchange rules for air compression in the machine�fs working cycle. The final calculation results of the four variants of the working process organization on the base of the two-stage gas turbine compression unit with inter-cooling and heating of the gas medium are presented. Opportunities and provision of energy efficiency increase of cascade pressure exchange gas turbine by increasing the maximum temperature of the circulation and recirculation of waste heat gas compression are shown.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2012, 32 (104) z. 1; 17-25
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Motematiceskaa model rabocego processa vozdusnoi holodilnoi masiny kaskadnogo obmena davleniem refriseratornyh sekcij morskogo transporta
Mathematical model of the working process of cascade pressure exchange air cooling machine of refrigeration section in maritime transport
Autorzy:
Krajniuk, A.
Klyus, O.
Powiązania:
https://bibliotekanauki.pl/articles/359118.pdf
Data publikacji:
2012
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
cascade pressure exchanger
gas turbine
heat exchanger
energy exchange
cascade exchange
circuit’s maximum temperature
Opis:
The article presents a mathematical model for determining the base regimes for common work of air cooling machine’s units with cascade pressure exchanger which allows to specify the device performance and thermal energy expenses. The final results of modeling and recommendations for the area of application are described.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2012, 32 (104) z. 1; 12-16
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Feasibility of using heat-recovery exchangers in livestock buildings at a site at a specific altitude with a specific average outdoor air temperature
Autorzy:
Sleger, V.
Neuberger, P.
Polak, M.
Powiązania:
https://bibliotekanauki.pl/articles/62353.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
feasibility
heat-recovery exchanger
livestock building
outdoor air temperature
climate condition
Czech Republic
agriculture
air temperature
weather station
ventilation
air exchange
heat exchanger
Opis:
The installation of an energy-saving facility must be preceded by analysis of its financial effectiveness. Among methods enabling such evaluation is the basic net profit calculation method. For this, the annual consumption of electricity for ventilation or of thermal energy for heating must be determined. The calculation formula uses the sum of energies for temperatures within the range from the calculation temperature for the area in question to the long-term average of the maximum temperature at the site, or to the temperature at which the heating power is zero. It is necessary to know the summary time of occurrence of a given temperature during a year. The site data can only be assessed based on long-term meteorological information. In fact, data used by current national standards to describe climatic conditions in the Czech Republic are from the years 1901 to 1950. The dependence of the average yearly temperature on altitude is shown in Fig. 1 for the 1961 1990 and 1991 2000 periods. It is evident that the average temperatures for the latter period are nearly 0.6 K higher than those for the former period, irrespective of the altitude. In this paper the climatic conditions are assessed based on daily data measured throughout the period from 1 January 1991 to 31 December 2000. Weather stations were selected so as to achieve a uniform coverage and continuity of measurement at each site (as far as possible). All the stations lie in the Czech Republic between 48.8° and 50.8° north latitude at altitudes from 158 m to 1324 m. It was the objective of this examination, based on the meteorological data collected to calculate the average number of days and hours during which the temperature during the year is lower than a specific limiting level, in dependence on the average yearly temperature of the site. Fig. 3 shows the average number of days in a year during which a temperature lower than a selected limiting level occurs, as calculated for the 1991 2000 period. The results are presented for 4 areas with average yearly temperatures of 6 °C 7 °C, 7 °C 8 °C, 8 °C 9 °C, and 9 °C 10 °C, respectively. The graphs enables us to ascertain the number of days during which a heating facility is in operation if the facility is activated by outdoor air temperature decrease to below a specific limiting level. If a typical daily temperature wave is considered, the method makes it possible to estimate the number of hours during which the air temperature is lower than the limiting level chosen. The difference between the data for various limiting levels allows us, for an area with a specific average yearly temperature to ascertain the time of occurrence of outdoor temperature within various ranges. The results of calculations are shown in Fig. 4 and Table 1. The method applied enables underlying data to be prepared for the assessment of energy demands for air heating at a given site and for estimation of the energy savings that could be achieved by installing economical air heating facilities in livestock buildings.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2009, 07
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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