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The effect of corona discharge in the steam on the rate of nucleation and condensation of the liquid phase is investigated theoretically and experimentally in means of implementation with the steam condenser for the improved phase-change rate. The considered phenomena include the nucleation of water vapor on mobile charge carriers, the electrohydrodynamic vapor flow toward the condenser wall and the thermodynamics of the charged micro-droplet. The prototype of the device is built and investigated. Obtained results confirm the improvement in the condensation rate.