How does vacuum furnace carry out heat conversion

The vacuum furnace is a vacuum environment with negative pressure formed in the closed furnace body, which is filled with heat medium water. The heat medium water is heated by combustion or other means, evaporated and condensed by the heat medium water to the heat exchanger, and then the water to be heated is heated by the heat exchanger.

Heat conversion diagram of vacuum furnace:
Oil, natural gas, gas, electricity — > combustion (electricity conversion heat) – > heat medium water — > steam condensation heat transfer after boiling — > heat exchanger — > heat conduction — > water

Working principle of vacuum furnace: use the characteristics of low boiling point of water under low pressure to quickly heat the heat medium water filled in the sealed furnace body, so that the heat medium water boils and evaporates the high-temperature water vapor, and the water vapor condenses on the heat exchange tube to heat the cold water in the heat exchange tube, so as to supply hot water.

Standard sea level atmospheric pressure: 1.013 × 105Pa = 101.3kPa, at this time, the boiling point of water is 100 ℃;

the higher the altitude, the lower the atmospheric pressure, the lower the boiling point is:
Qinghai Tibet Plateau: the average altitude is 4000m, the atmospheric pressure is 62kpa, and the boiling point of water is 87 ℃;

Mount Everest: the altitude is 8848m, the atmospheric pressure is 33kpa, and the boiling point is 71 ℃;

The vacuum furnace forms a low-pressure environment with almost no air by vacuuming, and then uses water to boil at low temperature (lower than atmospheric pressure) to generate steam, and the principle of heat output is worked by condensation and heat exchange of steam and water.

The heat medium water in the vacuum furnace is a high-purity water specially treated by deoxidation, descaling, etc. it is filled once before leaving the factory. When it is used, it is closed and circulates inside the unit (vaporization → condensation → vaporization), without increase or decrease, and does not need to be supplemented or replaced within the service life of the unit.