Abstract

This paper reports two-phase cooling in compact cross-flow microchannel heat exchangers with high power density up to 180 W/cm3. The performance is enabled by high-speed air flow through microchannels and two-phase condensation of refrigerant R245fa. The heat exchangers were realized in 1 cm3 blocks of copper alloy, using micro-electrical-discharging machining. Two heat exchanger designs were analyzed, fabricated, and tested. The first device has 150 air-side channels of diameter 520 μm, and the second device has 300 air-side channels of diameter 355 μm. In both cases the refrigerant channels are 2.0 × 0.5 mm2. The heat exchangers were operated with Reynolds number between 7500 and 20,500 for the air flow and with mass flux between 330 and 750 kg/m2 s for the refrigerant flow. The refrigerant temperature at the channel entrance was 80 °C, which is near the maximum operating temperature for some electronic devices. For comparison purposes, the devices were also tested with single-phase refrigerant flows. This work demonstrates the potential of high power density heat exchangers that leverage advanced manufacturing technologies to fabricate miniature channels.

Original languageEnglish (US)
Pages (from-to)1271-1277
Number of pages7
JournalApplied Thermal Engineering
Volume148
DOIs
StatePublished - Feb 5 2019

Fingerprint

Microchannels
Heat exchangers
Cooling
Refrigerants
Air
Flow of fluids
Copper alloys
Condensation
Machining
Reynolds number
Mass transfer
Temperature

Keywords

  • Compact heat exchanger
  • Cross-flow
  • Micro-electro-discharge machining
  • Microchannel
  • Two-phase flow

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

Cite this

High power density two-phase cooling in microchannel heat exchangers. / Kwon, Beomjin; Maniscalco, Nicholas I.; Jacobi, Anthony M; King, William Paul.

In: Applied Thermal Engineering, Vol. 148, 05.02.2019, p. 1271-1277.

Research output: Contribution to journalArticle

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