Research on critical mode transferring characteristics for adjustable thermal vapor compressor in MED-TVC system

In the present study, two special characteristics of "constant capacity" of thermal vapour compression (TVC) have been revealed and the advantage the adjustable TVC is researched based on the aerodynamic theory. And the spectrum features of critical mode transferring features under different condition of the adjustable TVC is obtained. The results indicate that the adjustable TVC can always operates on the optimal critical state based on combined regulation with varying primary pressure under different primary nozzle opening, which enlarges the range of stable operating condition of the TVC. In critical mode, the flow characteristics has strong similarity and the suction flow shows strong characteristics of "constant capacity". In the range of throat opening. from 80% to 120%, the adjustable TVC can promote the performance with entrainment ratio increasing 195.6% mean while the efficiency improving 148.7% in subcritical mode, and the entrainment ratio and efficiency improving 29.6% and 24.6%, respectively in critical mode.