Abstract
This article presents the results obtained from our own experimental investigations on heat exchange and pressure drop during the condensation flow of the HFE 7000 refrigerant in pipe minichannels with an internal diameter of di = 1.2–2.5 mm. The influence of vapor quality x and the mass flux density G on the two-phase flow pressure drops and heat transfer is presented. The tests were performed for the mass flux density range of G = 110–4700 kg/m2s, saturation inlet temperature of Ts = 36–43 °C and heat flux density of q = 1 ÷ 20 kW/m2. The pressure drop characteristics and heat transfer coefficient as a function of the internal diameter of minichannels are illustrated. The results of experimental research on the heat transfer coefficient and two-phase pressure drop are compared with correlations developed by other authors. The best accuracy has a comparison of experimental study with correlation of Rahman-Kariya-Miyara et al. and Mikielewicz et al.
Highlights
The literature presents various examples of the analysis of condensation in minichannels in many areas [1]. One such analysis was performed by Bohdal et al [2], in which the authors focused on studies of high-pressure refrigerants such as R404A, R407C and R410A
The amount of heat exchanged with the environment during refrigerant condensation in pipe minichannels was determined by using the method developed based on the concept presented in the work by Shin and
G ≈ 536 kg/m2 s causes a reduction in the heat transfer coefficient from α = 4324 W/m2 K
Summary
The literature presents various examples of the analysis of condensation in minichannels in many areas [1]. One such analysis was performed by Bohdal et al [2], in which the authors focused on studies of high-pressure refrigerants such as R404A, R407C and R410A. A very wide review of correlations for heat transfer during condensation in mini and microchannels was conducted by Awad et al [3]. They analyzed a wide range of flow and heat parameters for such refrigerants, such as C02 or R744, FC72, R22, R410A and R407C. The condensation process was realized in various shapes and orientations of the channels
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