What is the impact of high water temperature in a water jet pump cycle on vacuum level?
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We use water-jet vacuum pumps for vacuum creation. In actual production, if the temperature of the circulating water is too high, reaching 14–15 degrees or more, the vacuum effect is affected. Is the effect of circulating water temperature on vacuum degree related to the saturated vapor pressure of water? Is it because, as the water flow passes through the nozzle and enters the mixing chamber, the high water temperature due to the vacuum condition reaches the saturation vapor pressure, causing some water to vaporize and thus affecting the mixing of the medium being pumped with the water flow? Or does it affect the water column flow velocity? Or is it due to the high water temperature affecting the adequate condensation of the mixed gas in the expansion section of the venturi tube? Who can give a clear answer? The model of water-jet vacuum pump we use is SPB-450, which features 7 Laval nozzles. This post was last edited by Pseudo Xiao Bao on 2008-2-25 at 12:22.]
There definitely are. Also, it depends on your requirements regarding vacuum level; if the requirements aren’t high, then temperatures of 14–15 degrees won’t have any impact
If the water temperature is high, some of the water tends to vaporize during mixing, turning the circulating medium into a mixture of vapor and water, which directly affects the vacuum level. The general instruction manual specifies requirements regarding water temperature; installing a cooling coil inside the circulation tank may yield better results. The same is true for water ring vacuum pumps, as there are requirements for both the inlet water temperature and pressure. This post was last edited by xxrewj on 2008-2-25 15:10]
The saturation vapor pressure of water at 14–15 degrees is the ultimate vacuum level of the water jet vacuum pump. Also, I think your pumping capacity is affected as well; when the water temperature is high, you can reduce the heating level appropriately to maintain a vacuum. If the inlet flow rate deviates from the design values, the pumping volume will decrease.
Does the vacuum level have an impact on the opening degree of the pump’s outlet valve (i.e., the water flow rate)?
Water jet pumps encounter such problems, so what about steam jet pumps?
There is no need to open the pump valve further as long as the pressure before the vacuum pump remains stable and meets the requirements.
Agreed. Once the system is stable, increasing the scale further won’t have much effect; it depends on the design. Vacuum pumping pumps may seem simple, but in actual use, various problems often arise.
A vacuum jet pump is used to transport gases. If the temperature is high, it affects efficiency. As a result, the negative pressure of the vacuum pump decreases.