The vacuum cannot be drawn in the two-stage evaporative condenser
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Current status: In Stage 1, both the vacuum level and the instantaneous vacuum level are within the specified limits. In Stage 2, the vacuum level is 5.7 KPa; meanwhile, the vacuum level at the Stage 2 condenser is 48 KPa, while that after the Stage 2 condenser is around 6 KPa. No leaks have been detected in the Stage 2 condenser, and the vacuum break valve closes tightly without any leakage. Please discuss this among yourselves.
What vacuum pumping process did the OP use? There are basically two reasons why a vacuum cannot be established in a two-stage evaporative condenser: first, there are leaks in the system’s equipment and piping; second, there are problems with the vacuum pumping equipment or its operation. Please conduct a thorough inspection. Additionally, there’s also inaccurate display.
May I ask if the evaporator system of the OP has a booster? And please let me know what the temperatures of the condensates are?
This post was last edited by fjhuyuyang on July 2, 2012, at 15:02. How is the condensing effect of the condenser after the second stage? Has any scale or dirt accumulated on it? Is the filter screen before the injector clogged? Has it been checked?