Regarding compressor operating conditions
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The performance curves provided by the vehicle manufacturer usually include curves for many different operating conditions. Some operating conditions are “100%FLOW WITH WATER”, while others are “100%FLOW WITHOUT WATER”. It’s understandable when there’s no water involved, as the compressor isn’t supposed to contain water in the first place. But what does carrying water mean? I checked the data sheet again: pressure is 1.3 barA, temperature is 37 degrees Celsius, and the molecular weight is 35 (it should include water; without water, it’s 31). Under the design conditions, the gas flow rate is 60,907 kg/h, and the water flow rate is 800 kg/h. Based on these data, it is liquid water. How could the vehicle manufacturer provide curves under such operating conditions? How should the surge line and anti-surge valve be calculated under such operating conditions, and are the calculation results meaningful?
By \"with water\" and \"without water\", it is not referring to liquid water; rather, it refers to dry gas and humid gas. These are indicators of two different operating conditions. By specifying both conditions, all possible operating scenarios can be covered, which is equivalent to considering an extreme situation.
Air compressor discharge volume = Design flow rate * 60 * (273.15 / (273.15 + ambient temperature)) * ((0.1035 – vacuum level) / 0.1035) * leakage coefficient * (1 – moisture content). It can be seen that the moisture content of the incoming air has a significant impact on the actual exhaust volume of the air compressor. In fact, in conditions of high humidity, the composition of the incoming gas decreases, and more heat is released as moisture liquefies during compression, causing the outlet temperature of the air compressor to rise; as a result, the overall load on the air compressor decreases.