Face up to the four focus questions and answers


What is the material of heat exchanger in vacuum hot water boiler?
The heat exchanger in the boiler USES SUS304 stainless steel tube. The pipe is not easy to scale, high heat transfer efficiency, and will not rust.
Why is the hot medium water in the vacuum hot water boiler heated in the vacuum state?
Water under different pressure, the boiling temperature is different, in an atmospheric pressure (0.1 Mpa), water boiling temperature is 100 ℃, and under the pressure of 0.8 Kpa, water boiling temperature of 4 ℃. Vacuum hot water boiler is in vacuum 2.67 Kpa ~ 66.6 Kpa pressure within the scope of work, the corresponding saturation temperature is 15 ℃ ~ 85 ℃. So in a vacuum, it's very easy for the hot water to boil and vaporize.
Why must vacuum in operation of vacuum water boiler?
When noncondensable gas is produced inside a vacuum boiler, the pressure will rise, which is called vacuum destruction. The non - condensable gas produced in vacuum boiler has serious influence on heat exchange efficiency. When the volume content of non-condensable gas reaches 0.2%, the thermal efficiency decreases by 20-30%, the outlet water temperature cannot be raised, and the output of the boiler can be reduced, so the non-condensable gas must be drawn out when the vacuum boiler is running.
Is the vacuum hot water boiler a big investment?
Although vacuum boiler host prices higher than ordinary hot water boiler, but USES the vacuum hot water boiler can save a lot of auxiliary investment: plate heat exchanger, displacement heat exchanger, a circulating pump, soft water treatment equipment and the expansion water tank, etc., can also save the corresponding pipe installation and auxiliary power ZengRongFei, systems and control, etc., comprehensive investment or is lower than the common hot water boiler system.

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