An investigation of the heat transfer coefficient during refrigerant evaporation

• Autorzy: Dutkowski Krzysztof , Kruzel Marcin , Bohdal Tadeusz

Identyfikatory

DOI

10.36119/15.2023.10.3

Warianty tytułu

PL

Badanie współczynnika przejmowania ciepła podczas odparowania czynnika chłodniczego

• Języki publikacji: EN

Abstrakty

EN

This study presents the experimental research data on the local heat transfer coefficient during refrigerant expansion evaporation in horizontal pipe minichannel. Heat exchange took place between the heated channel wall and the working fluid flowing inside (R134a and R404A). AISI 316 stainless steel pipe minichannels with an internal diameter in the range of d_i = 0.64 - 2.30 mm were used. The so-called minichannels are widely used to build miniature heat exchangers. Tests carried out in the range of mass flux density G = 350 - 1400 kg/(m²s) and heat flux density reaching q = 90 kW/m² allowed to observe the occurrence of the flashing phenomenon, not observed in conventional channels. It has been shown that in the zone covered by the flashing phenomenon, the heat exchange conditions deteriorate, and the value of the local heat transfer coefficient in this zone may drop by up to 50%.

PL

W pracy przedstawiono wyniki badań eksperymentalnych lokalnego współczynnika przejmowania ciepła podczas odparowywania czynnika chłodniczego w minikanale poziomym. Wymiana ciepła odbywała się pomiędzy ogrzewaną ścianką kanału a przepływającym wewnątrz czynnikiem roboczym (R134a i R404A). Zastosowano minikanały rurowe ze stali nierdzewnej AISI 316 o średnicy wewnętrznej w zakresie d_i = 0,64 - 2,30 mm. Tak zwane minikanały są szeroko stosowane do budowy miniaturowych wymienników ciepła. Badania przeprowadzone w zakresie gęstości strumienia masy G = 350 - 1400 kg/(m²s) i gęstości strumienia ciepła dochodzącej do q = 90 kW/m² pozwoliły zaobserwować występowanie zjawiska flashingu, nie obserwowanego w konwencjonalnych kanałach. Wykazano, że w strefie objętej zjawiskiem flashingu pogarszają się warunki wymiany ciepła, a wartość lokalnego współczynnika przejmowania ciepła w tej strefie może spaść nawet o 50%.

Słowa kluczowe

EN

experimental data; refrigerant; heat transfer coefficient; minichannels; expansion evaporation

PL

dane eksperymentalne; czynnik chłodniczy; współczynnik przenikania ciepła; minikanały; odparowanie rozprężne

• Wydawca: Ośrodek Informacji "Technika instalacyjna w budownictwie''
• Czasopismo: Instal
• Rocznik: 2023
• Tom: nr 10
• Strony: 15--20
• Opis fizyczny: Bibliogr. 36 poz., rys., tab., wzory

Twórcy

autor

Dutkowski Krzysztof

• Koszalin University of Technology, Faculty of Mechanical Engineering, Koszalin, Poland

• https://orcid.org/0000-0003-3945-9882

autor

Kruzel Marcin

• Koszalin University of Technology, Faculty of Mechanical Engineering, Koszalin, Poland

• https://orcid.org/0000-0001-8349-1375

autor

Bohdal Tadeusz

• Koszalin University of Technology, Faculty of Mechanical Engineering, Koszalin, Poland

• https://orcid.org/0000-0002-0621-2894

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).