Prediction of effective heat transfer coefficients for vapour condensation inside horizontal tubes in stratified phase flow

In modern condensers of air conditioning systems, heat pumps, evaporators seawater desalination and heaters power plants, the process vapour condensation is carried out mainly inside horizontal tubes channels. Heat transfer processes occurring in have a significant effect on overall energy efficiency mentioned systems. this paper, experimental investigation during freons R22, R406a, R407c plain smooth tube with d = 17 mm were following parameters: ts 35–40°C, G 10–100 kg/(m2s), x 0.8–0.1, q 5–50 kW/m2, ΔT 4–14 K. The unique measurements circumferential fluxes coefficients thick wall method different modes. It can be inferred that increase flux, at top part thickness condensate film increases, which leads to decrease transfer. At bottom tube, flux enhances coefficient, characteristic turbulent liquid flow tube. obtained results allowed improving prediction effective for condensation, takes into account influence lower This generalises sufficient accuracy (error ± 30%) data R134a, R123, R125, R32, R410a, propane, isobutene, propylene, dimethyl ether, carbon dioxide, methane under stratified conditions. Using designing exchangers, utilise such types fluids, will thermal