Abstract
Adiabatic pressure drop in chevron and two styles of bumpy plate heat exchangers were investigated for vertical upward flow with R134a. Qualities ranging from sub-cooled liquid to superheated vapor were investigated. Mass fluxes ranged from 16 kg/m 2 s (for superheated vapor) to approximately 300 kg/m 2 s (for sub-cooled liquid). The pressure drop experiments were conducted for 10 °C and 20 °C inlet temperatures. A two-phase pressure drop model, based on the kinetic energy of the flow, was developed in order to relate the two-phase pressure drop data to the single-phase data. The model predicts two-phase pressure drop within 15% of experimental measurements.
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