超臨界R-410A與R-32熱傳及壓降性能之研究

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Title:	超臨界R-410A與R-32熱傳及壓降性能之研究
Authors:	張奇喆;Chang, Chi-Che
Contributors:	能源工程研究所
Keywords:	超臨界;R-410A;R-32;熱傳;壓降;Supercritical;R-410A;R-32;Heat Transfer;Pressure Drop
Date:	2017-01-20
Issue Date:	2017-05-05 17:23:09 (UTC+8)
Publisher:	國立中央大學
Abstract:	本文以實驗的方式研究R-410A與R-32，在圓管6.5mm中穿越超臨界區域的加熱熱傳及壓降特性。R-410A壓力分別為5.0 MPa與5.5 MPa，溫度從59oC-87oC。R-32壓力分別為5.8 MPa與6.5 MPa，溫度從65oC-87oC。流量分別為200 kg/m2s、400 kg/m2s、600 kg/m2s與800 kg/m2s。在不同的擬臨界壓力下，擬臨界壓力越高，整體壓降會降低，但熱傳也降低，擬臨界壓力越低，整體壓降升高，熱傳也會升高。在R-410A與R-32不同流體的壓降與熱傳係數比較，R-410A與R-32的壓降相差很小，但熱傳係數方面，R-32的最高熱傳係數與R-410A的最高熱傳係數相差2000 W/m2-K。 ;In this paper, the heat transfer and pressure drop characteristics of R-410A and R-32 in the supercritical region of 6.5mm in the tube are studied experimentally. R-410A pressure was 5.0 MPa and 5.5 MPa, the temperature from 59oC-87oC. R-32 pressure was 5.8 MPa and 6.5 MPa, the temperature from 65oC-87oC. Flow rates were 200 kg / m2s, 400 kg / m2s, 600 kg / m2s and 800 kg / m2s, respectively. At different pseudo - critical pressures, the higher the pseudo - critical pressure, the lower the overall pressure drop, but also reduce the heat transfer, the lower the pseudo - critical pressure, the overall pressure drop, heat transfer will increase. R-410A and R-32 different fluid pressure drop and heat transfer coefficient comparison, R-410A and R-32 pressure drop difference is very small, but the heat transfer coefficient, R-32 maximum heat transfer coefficient and the R- 410A of the maximum heat transfer coefficient difference of 2000 W / m2-K.
Appears in Collections:	[Energy of Mechatronics] Electronic Thesis & Dissertation

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