There are issues with the lithium bromide unit; could Haiyou help analyze them?
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Question 1: Can lithium bromide be kept under vacuum for a long time? I know that evacuating air is done to achieve better cooling, as lower pressure leads to more evaporation. Normally, when stress builds up subconsciously, I would stop the vacuum pump for about an hour. But recently, with the preparations for the summer season, a colleague kept running the vacuum pump for long periods of time; even though the pressure had already dropped, he continued to use it, saying that air shouldn’t get in. I don’t understand what they mean; please help analyze it. The most worrying thing is that problems arose afterward; I’m not sure if it was caused by vacuum pumping. During the pumping process, the oil level in the vacuum pump increased, and the lithium bromide solution was drawn out. (The manufacturer’s representative said that there was a leak in the pipe at 7 degrees; we then disassembled it to check and found a hole, and indeed there was a leak. However, I still can’t make sense of the explanation given.) Question 2: Does vacuuming remove pressure from the evaporator? Since the solution is in the absorber and generator, how can it end up in the vacuum pump? I’m confused by this. Question 3: What temperature does the evaporation temperature mentioned in the picture refer to? Refrigerant temperature? What does refrigerant temperature refer to? Question 4: Does the regeneration temperature refer to the high-temperature range? How to understand it?
In my opinion: 1. The vacuum pump should remain on at all times, as a continuous negative pressure is necessary for lithium bromide to flash and to remove some of the non-condensable gases. 2. Vacuuming is carried out in two locations – the lithium bromide solution can go into the gas-liquid separator before the vacuum pump, where the gases are removed by the vacuum pump while the lithium bromide returns to the system；
The recent problem is that the vacuum pump keeps running; it seems that water has entered the lithium bromide solution. The oil level in the vacuum pump keeps rising, so it’s necessary to drain water and add oil every hour. But the pressure has increased as usual; it used to be as low as 0.5 kPa, but now it is 2.5 kPa. There’s one more thing I really want to ask: where is the separator located? ? ? ?
Hi, I have a question: when the user load decreases, it means that the heat exchange equipment needs to be shut down, as there is no longer a need for heat exchange. At this point, the cooling capacity of the unit is sufficient; the return water temperature is 7.4 degrees, while the supply water temperature is 7.1 degrees. May I ask if adjusting the cold water supply volume is the correct approach right now? When the temperature of the circulating water is high, it is necessary to turn on the fan; however, once the temperature drops, the temperature of the water also falls by 7 degrees.