Wymiana ciepła podczas wrzenia przechłodzonego czynnika R134a w minirurkach

• Autorzy: Dutkowski K. , Charun H.

Warianty tytułu

EN

Subcooled flow boiling heat transfer of R134a in minichannels

• Języki publikacji: PL

Abstrakty

PL

W pracy przedstawiono wyniki badań eksperymentalnych wrzenia przechłodzonego podczas przepływu w minikanałach. Współczynniki przejmowania ciepła uzyskano podczas pomiarów wrzenia przechłodzonego R134a w poziomych rurkach o średnicy wewnętrznej: 0,45, 0,55, 0,80, 1,10, 1,15, 1,30, 1,35, 1,40, 1,60, 1,68, 1,94 oraz 2,30 mm i ogrzewanej długości 200 mm. Współczynniki przejmowania ciepła uzyskano dla strumieni ciepła dochodzących do 90 kW/m2 oraz średnich gęstości strumienia masy: 358,1 438,558,789,940 oraz 1401 kg/(m2s). Stwierdzono, że dspółczynniki przejmowania ciepła silnie zależą od doprowadzanego strumienia ciepła oraz od stopnia suchości. Niektóre z korelacji, stosowanych w kanałach konwencjonalnych (Shah, Kandlikar, ThomJ Bergles & Rohsenow), mogą być stosowane do obliczania współczynnika przejmowania ciepła podczas wrzenia przechłodzonego w minikanałach.

EN

This paper presents experimental results on subcooled flow boiling in minichannels. Heat transfer coefficients were measured for subcooled flow boiling of R134a in horizontal circular tubes with internal diameters of 0.45, 0.55, 0.80, 1.10, 1.15, 1.30, 1.35, 1.40,1.60,1.68,1.94 and 2.30 mm, and uniformly heated length of 200 mm. Heat transfer coefficients were obtained for a heat flux up to 90 kW/m2, average mass fluxes of 358, 438, 558, 789, 940 and 1401 kg/(m2s). Heat transfer coefficients were found to be a strong function of heat flux and vapour quality. Some correlation well known in conventional channels (Shah, Kandlikar, Thom, Bergles & Rohsenow) can be used to prediction of subcooled flow boiling heat transfer coefficient in minichannels.

Słowa kluczowe

PL

wymiana ciepła; czynnik R134a; minirurki

EN

subcooled flow; R134a; minichannels

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Chłodnictwo : organ Naczelnej Organizacji Technicznej
• Rocznik: 2009
• Tom: R. 44, nr 10
• Strony: 26--33
• Opis fizyczny: Bibliogr. 27 poz., rys., tab.

Twórcy

autor

Dutkowski K.

autor

Charun H.

• Politechnika Koszalińska, Katedra Techniki Cieplnej i Chłodnictwa

Bibliografia

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