When choosing heating elements, we should also deal with the chemical properties of the products according to our own needs, so as to avoid the material of heating elements affecting the quality of the workpiece. Therefore, the heating elements should be selected reasonably in vacuum furnace.
In normal experiments, if there is a liquid, it needs a process of liquid evaporation (which can be vaporized without heating under high vacuum), and can be vaporized by vacuum pulling for a long time to achieve high vacuum (equal stability).
If the target air pressure is not reached for a long time, the system and Roots pump should be considered. You can directly measure the limit vacuum of Roots pump (without access to other systems). If it is intact, it is the sealing performance of the system.
The design temperature of the heat medium of the radiator hot water heating system is generally determined according to the thermal comfort requirement, the safety and economy of the system operation. The temperature of water supply does not exceed 95 C, which ensures that the heat medium does not vaporize under atmospheric pressure. In the past, the temperature of water supply and return is 95 C/70 C.
However, in recent years, according to the advanced experience of heating at home and abroad, proper reduction of the temperature of heat medium is conducive to improving comfort, so 80/60 C is often used. Vacuum hot water boiler meets the requirement of 80/60 C of inlet and outlet water temperature in the design of radiator heating system.
Nowadays, even if the design water temperature is 95/70 C, when the design outdoor temperature is reached, the running water temperature of the residential building heated by urban heat network or district central boiler room can generally be only about 70/55 C, which can ensure the design indoor temperature.
Because the main factors determining the efficiency of the radiator are the radiation area of the radiator and the velocity of the medium inside the radiator (which has little relation to the temperature of the medium), and the same amount of heat carried by the same circulating water with the same temperature difference.
Vacuum hot water boilers differ from traditional boilers (95/70 C) in the radiator heating system mainly because the heating time of rooms is 4-5 minutes slower than that of traditional boilers.
Direct-Brazing-Technology-of-Ceramics
Reasons-and-Solutions-for-Abnormal-Color-of-Products-Heat-Treated-in-Vacuum-Furnace
Vacuum-Gas-Quenching-Furnace-Cautions
What-are-the-causes-of-vacuum-furnace-explosion
The first tube-pass is entirely immersed in the water and goes from one end of the boiler to the other. Depending on the boiler's design there might be a second tube-pass (also fully immersed) in which case the boiler is called a "three pass" model (since the furnace is counted as the first pass).
回复删除boiler heating treatment company in Ontario