Analysis of heat flow in a tube bank of a condenser considering the influence of air

• Autorzy: Joachimiak M. , Joachimiak D. , Krzyślak P.

Identyfikatory

DOI

10.1515/aoter-2017-0019

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

condensation; inert gas; mass share of gas noncondensing in water vapor; Dalton’s law; water vapor pressure; air partial pressure

PL

kondensacja; gaz obojętny; Prawo Daltona; ciśnienie pary wodnej; ciśnienie parcjalne

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2017
• Tom: Vol. 38, no. 3
• Strony: 119--134
• Opis fizyczny: Bibliogr. 11 poz., rys., tab., wz.

Twórcy

autor

Joachimiak M.

• Poznan University of Technology, Chair of Thermal Engineering, Piotrowo 3, 60-965 Poznań, Poland

autor

Joachimiak D.

• Poznan University of Technology, Chair of Thermal Engineering, Piotrowo 3, 60-965 Poznań, Poland

autor

Krzyślak P.

• Poznan University of Technology, Chair of Thermal Engineering, Piotrowo 3, 60-965 Poznań, Poland

Bibliografia

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