Published 8 issues per year
ISSN Print: 1065-5131
ISSN Online: 1563-5074
Indexed in
LOCAL HEAT TRANSFER MEASUREMENTS WITHIN A REPRESENTATIVE PLATE HEAT EXCHANGER GEOMETRY USING INFRARED (IR) THERMOGRAPHY
ABSTRACT
Plate heat exchangers are known to be highly efficient and compact, but the lack of local heat transfer data within the channel has limited the ability to optimize plate geometries. A new method for the measurement of steady-state, local, convective heat transfer coefficient distributions within a typical plate heat exchanger geometry is described herein. This novel technique uses chevron patterns machined into an IR-transparent calcium fluoride (CaF2) plate to produce the plate heat exchanger geometry. The fluid tested was a refrigerant (HFE7100) at Reynolds numbers ranging from 900 to 3500 in vertical upward flow. The plates were electrically heated using a flexible film heater at heat fluxes up to 0.8 W/cm2. A mid-range (3.0−5.1 µm) IR camera was used to measure the local temperature of the heated surface. The technique was validated by comparing the measured overall Nusselt number of the heat exchanger with commonly used correlations. The local results were also compared with additional experimental and numerical results.
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