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Flow boiling of halogenated olefins inside a square cross-section microchannel
New experimental heat transfer coefficients measured during flow boiling of HFO-1234ze(E) and HFO-1234yf inside a square cross-section microchannel having a hydraulic diameter of 1.23 mm are presented. The test runs have been performed with mass flux ranging between 200 and 500 kg m−2 s−1 and heat flux between 20 and 170 kW m−2. The local heat transfer coefficients are compared against the values previously measured using the same refrigerants in a 1 mm diameter tube, with the aim of highlighting the effect of the noncircular shape of the cross-section. The experimental data are compared against predicting models available in the literature to suggest possible design methods for evaporators adopting hydrofluoroolefins in microchannels.
Flow boiling of halogenated olefins inside a square cross-section microchannel
New experimental heat transfer coefficients measured during flow boiling of HFO-1234ze(E) and HFO-1234yf inside a square cross-section microchannel having a hydraulic diameter of 1.23 mm are presented. The test runs have been performed with mass flux ranging between 200 and 500 kg m−2 s−1 and heat flux between 20 and 170 kW m−2. The local heat transfer coefficients are compared against the values previously measured using the same refrigerants in a 1 mm diameter tube, with the aim of highlighting the effect of the noncircular shape of the cross-section. The experimental data are compared against predicting models available in the literature to suggest possible design methods for evaporators adopting hydrofluoroolefins in microchannels.
Flow boiling of halogenated olefins inside a square cross-section microchannel
Bortolin, Stefano (author) / Azzolin, Marco (author) / Del Col, Davide (author)
Science and Technology for the Built Environment ; 22 ; 1238-1253
2016-11-16
16 pages
Article (Journal)
Electronic Resource
English
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