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Wyszukujesz frazę "vapor partial pressure" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
The analyzis of the stream-air mixture during a flow through a tube bank inside a condenser
Autorzy:
Krzyślak, P.
Joachimiak, M.
Powiązania:
https://bibliotekanauki.pl/articles/175261.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
condenser
pressure drop
steam-air mixture
water vapor condensation in a solution with air
partial pressure
Opis:
The paper presents the results of calculations related to the flow analysis of a tube bank taking into account the partial pressures of gases flowing through the condenser. Different mass share of the gas not condensing in the heat exchanger upstream to the first row of tubes and the partial pressures of water vapor and air have been taken into account. The value of the partial pressures of gases, pressures drop, temperature, velocity, Reynolds number, and air share in the subsequent rows of tubes have been calculated. This study is a basis for the analysis of heat exchange in the condenser considering the influence of the noncondensing gas. The increase in the share of air in the following rows of tubes results in an increase in the thermal resistance and condensation of increasingly lower mass of water vapor.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2014, 126; 131-140
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of heat flow in a tube bank of a condenser considering the influence of air
Autorzy:
Joachimiak, M.
Joachimiak, D.
Krzyślak, P.
Powiązania:
https://bibliotekanauki.pl/articles/240202.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
condensation
inert gas
mass share of gas noncondensing in water vapor
Dalton’s law
water vapor pressure
air partial pressure
kondensacja
gaz obojętny
Prawo Daltona
ciśnienie pary wodnej
ciśnienie parcjalne
Opis:
The pressure of wet water vapor inside a condenser has a great impact on the efficiency of thermal cycle. The value of this pressure depends on the mass share of inert gases (air). The knowledge of the spots where the air accumulates allows its effective extraction from the condenser, thus improving the conditions of condensation. The condensation of water vapor with the share of inert gas in a model tube bank of a condenser has been analyzed in this paper. The models include a static pressure loss of the water vapor/air mixture and the resultant changes in the water vapor parameters. The mass share of air in water vapor was calculated using the Dalton’s law. The model includes changes of flow and thermodynamic parameters based on the partial pressure of water vapor utilizing programmed water vapor tables. In the description of the conditions of condensation the Nusselts theory was applied. The model allows for a deterioration of the heat flow conditions resulting from the presence of air. The paper contains calculations of the water vapor flow with the initial mass share of air in the range 0.2 to 1%. The results of calculations clearly show a great impact of the share of air on the flow conditions and the deterioration of the conditions of condensation. The data obtained through the model for a given air/water vapor mixture velocity upstream of the tube bank allow for identification of the spots where the air accumulates.
Źródło:
Archives of Thermodynamics; 2017, 38, 3; 119-134
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena wielkości emisji węglowodorów do atmosfery podczas przeładunku i magazynowania oleju napędowego w zbiornikach z dachem stałym
Assessment of the amount of hydrocarbon emissions to the atmosphere during handling and storage of diesel fuel in fixed roof tanks
Autorzy:
Domin, Jakub
Piechota, Marek
Czechowicz, Dymitr
Skutil, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/1834236.pdf
Data publikacji:
2020
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
olej napędowy
magazynowanie
emisja węglowodorów
prężność par
współczynniki Antoine’a
wytyczne projektowe
Diesel fuel
storage
hydrocarbon emissions
vapor partial pressure
Antoine coefficients
design guidelines
Opis:
Diesel fuels currently constitute around 60–70% of the turnover of fuel bases in Poland. Diesel fuels are stored in vertical steel tanks with fixed roofs, which, according to applicable legal acts, do not require airtight sealing. This results in the emission of gases containing hydrocarbons to the atmosphere, which at high turnover of fuel bases generates the need to determine the concentration of hydrocarbons emitted to the atmosphere and to perform calculations of concentrations occurring at the boundary of the fuel base site. The article collects available literature data and presents the results of research on the emissions of hydrocarbons to the atmosphere that occur during handling and storage of diesel fuel in storage tanks, including the determination of the saturated vapor pressure of the hydrocarbon components of the tested diesel fuel depending on the temperature. The emissions tests were carried out by taking gas samples emitted during operations on diesel storage tanks. Analyzes of the gas samples supplied in gas-tight syringes were performed with SRI 8610C gas chromatograph equipped with a flame ionization detector (FID) and an alumina packed column. Diesel oil sample analysis was performed by gas chromatography using Shimadzu GC-2010 Plus chromatograph equipped with flame ionization detector (FID). ZB-5HT column (30 m × 0.25 mm × 0.25 µm) was used for the separation of the substances. Research has shown the amount of hydrocarbon emissions to the atmosphere depending on the type of loading operations, the degree of storage tank filling and oil temperature. The dependence of the concentration of hydrocarbons emitted from the storage tank depending on the degree of filling of the tank has been determined in the research. Results of calculations of diesel vapor pressure show convergence with most available literature data and measurement results. General design guidelines have been defined to determine the data necessary to calculate the level of hydrocarbon concentrations in atmospheric air. The research was aimed at creating the basis for the required environmental calculations, relevant in the absence of relevant literature data, necessary for the reliable determination of the amount of hydrocarbon emissions.
Źródło:
Nafta-Gaz; 2020, 76, 3; 192-204
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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