What is a non-condensable gas? What does it refer to?

Simply put, it is a gas that does not condense. Such as nitrogen, air, and other gases that do not condense in the device

Gases that cannot condense into a liquid under working conditions generally refer to air dissolved in or mixed within a fluid, as well as gases generated by reactions (such as H2 produced by electrochemical reactions). For reference.

Gases with a critical temperature lower than room temperature are non-condensable gases.

Gases that cannot be condensed into a liquid under specified operating conditions seem to occur quite often in the context of water vapor, and among these, air separators are the most relevant.

It is estimated that the original poster is asking about topics related to steam heating. If that is the case, the following explanation can be given: during the heating process, water vapor condenses, and aside from the very small amount of air that dissolves in the condensed water, the rest of the air remains in gaseous form. Since this gaseous portion does not condense, it dilutes the steam, which is supposed to serve as the heating medium, thereby affecting the heat transfer efficiency. The non-condensable gases mentioned in this process refer to such gases.

It’s straightforward and easy to understand at a glance: handshake. Let me add: non-condensable gases are those that cannot be re-condensed into a liquid state under the operating conditions of a heat pipe. The common non-condensable gas is hydrogen. The main methods to avoid the formation of non-condensable gases include choosing working fluids with high compatibility, performing passivation treatment on the pipes, and using appropriate combined working fluids :victory: :victory:

The non-condensable gas in the heat exchanger is air; it has a low heat transfer coefficient, and its presence reduces the heat transfer efficiency.

Gases that cannot be condensed under process conditions are collectively referred to as non-condensable gases. Commonly, it is the N2 remaining in the equipment after displacement or airtight sealing. In distillation operations, if the tower pressure drop does not decrease, it is usually caused by an excessive amount of non-condensable gases.

:victory: Completely correct :victory:

Non-condensable gases seem to refer to gases that fail to turn into a liquid state during the cooling process; these gases create an air film inside the tube being cooled, which reduces the thermal conductivity and increases energy consumption, among other things...

In industrial production, non-condensable gas refers to gases that cannot be condensed into a liquid phase under the current operating conditions. This amount needs to be controlled; if it is too high, the yield of liquid product will decrease, and gas leakage is more likely to occur.

Particles that can cause gases to adhere to them and quickly condense into a liquid – this definition is not the standard one; it’s based on my own understanding and is provided for reference only. Let me give you an example. Suppose there is a sealed container filled with water vapor at 100°C. The boiling point of water is 100°C, which means that this is also the temperature at which water vapor condenses. If the container contains pure water vapor, without any impurities such as dust, then even if the temperature is suitable (and the pressure is also appropriate), the water vapor will not condense into water droplets. Such a gas is what’s known as a “supersaturated gas”. If some dust is added to this already suitable water vapor, then water molecules will quickly attach themselves to the dust particles, thereby forming mist. In this case, the dust acts as nucleation sites, accelerating the process of gas condensation and making it more likely to occur.

Gases that cannot condense into a liquid under working conditions, such as air, are harmful to refrigeration systems

Non-condensable gas refers to a medium that cannot be condensed under operating conditions.

In our three-effect unit, the principle regarding the use and evacuation of non-condensable gas is relatively simple. However, the non-condensable gas itself has a complex composition, and many problems arise after it is put into use.

Non-condensable gases refer to air, hydrogen, nitrogen, lubricating oil vapor, etc., that are mixed within the refrigeration system. These gases circulate in the system along with the refrigerant; they do not condense together with the refrigerant, nor do they produce a cooling effect.

They are gases that cannot be condensed into a liquid at certain temperatures and pressures, such as nitrogen and carbon dioxide in the air. In a vacuum concentration system, the vacuum pump is used to remove non-condensable gases

Non-condensable gases in the production process refer to gases that cannot be liquefied by normal means under normal operating conditions of the facility; for example, C2/C3 compounds contained in raw material C4 during MTBE production are such gases that cannot be liquefied through methods like heat exchange during normal production. Non-condensable gases are generally discharged to ground-based incinerators, dry gas tanks, etc.

Non-condensable gas is a medium that cannot be condensed at normal temperature and pressure.