THE STUDY AND ANALYSIS OF THE COMPLETE COOLING DUAL-STAGE COMPRESSION SYSTEM IN SECONDARY THROTTLING

摘要

In order to probe into the secondary throttling the cool completely in the middle of the two-stagecompression system running characteristic of under low temperature conditions, the evaporation temperaturet_0 = -20 °C , temperature of condensation temperature t_k =30 °C ～50 °C condition, analysis the secondarythrottling intermediate cycle characteristics of the cooling system completely, analysis showed that theevaporation pressure is constant, as the condensing temperature rising, condensing pressure and intermediatepressure increasing, the tendency of increase with the condensing pressure is higher than the pressure in themiddle of the trend, system COP and decreases with the increase of condensation temperature, high and lowlevel flow ratio increases with the increase of condensation temperature and slow; Condensing pressure isconstant, with the constant rise of evaporation, the evaporation pressure and intermediate pressure increasing,the system COP also increases with the increase of evaporation temperature, high and low level flow ratioincreases with the evaporation temperature decreases slowly;