superheated steam - translation to ρωσικά
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superheated steam - translation to ρωσικά

STEAM WHOSE TEMPERATURE CAN BE DECREASED WITHOUT IMMEDIATELY CONDENSING
Dry steam
  • Volume (v), energy (u), enthalpy (h), and entropy (s) versus temperature (C) for superheated steam

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Ορισμός

steamy
¦ adjective (steamier, steamiest)
1. producing, filled with, or clouded with steam.
2. hot and humid.
3. informal of or involving erotic sexual activity.
Derivatives
steamily adverb
steaminess noun

Βικιπαίδεια

Superheated steam

Superheated steam is steam at a temperature higher than its vaporization point at the absolute pressure where the temperature is measured.

Superheated steam can therefore cool (lose internal energy) by some amount, resulting in a lowering of its temperature without changing state (i.e., condensing) from a gas, to a mixture of saturated vapor and liquid. If unsaturated steam (a mixture which contains both water vapor and liquid water droplets) is heated at constant pressure, its temperature will also remain constant as the vapor quality (think dryness, or percent saturated vapor) increases towards 100%, and becomes dry (i.e., no saturated liquid) saturated steam. Continued heat input will then "super" heat the dry saturated steam. This will occur if saturated steam contacts a surface with a higher temperature.

Superheated steam and liquid water cannot coexist under thermodynamic equilibrium, as any additional heat simply evaporates more water and the steam will become saturated steam. However, this restriction may be violated temporarily in dynamic (non-equilibrium) situations. To produce superheated steam in a power plant or for processes (such as drying paper) the saturated steam drawn from a boiler is passed through a separate heating device (a superheater) which transfers additional heat to the steam by contact or by radiation.

Superheated steam is not suitable for sterilization. This is because the superheated steam is dry. Dry steam must reach much higher temperatures and the materials exposed for a longer time period to have the same effectiveness; or equal F0 kill value. Superheated steam is also not useful for heating; while it has more energy and can do more work than saturated steam, its heat content is much less useful. This is because superheated steam has the same heat transfer coefficient of air, making it an insulator - a poor conductor of heat. Saturated steam has a much higher wall heat transfer coefficient.

Slightly superheated steam may be used for antimicrobial disinfection of biofilms on hard surfaces.

Superheated steam's greatest value lies in its tremendous internal energy that can be used for kinetic reaction through mechanical expansion against turbine blades and reciprocating pistons, that produces rotary motion of a shaft. The value of superheated steam in these applications is its ability to release tremendous quantities of internal energy yet remain above the condensation temperature of water vapor; at the pressures at which reaction turbines and reciprocating piston engines operate.

Of prime importance in these applications is the fact that water vapor containing entrained liquid droplets is generally incompressible at those pressures. In a reciprocating engine or turbine, if steam doing work cools to a temperature at which liquid droplets form, then the water droplets entrained in the fluid flow will strike the mechanical parts with enough force to bend, crack or fracture them. Superheating and pressure reduction through expansion ensures that the steam flow remains as a compressible gas throughout its passage through a turbine or an engine, preventing damage of the internal moving parts.

Παραδείγματα από το σώμα κειμένου για superheated steam
1. The U.S. firm is linking arms with an Israeli company, Luz II, which develops utility–scale solar thermal electric power plants that convert water to superheated steam using sunshine. (Avi Bar–Eli) You still can‘t trade in Google shares in Tel Aviv.
Μετάφραση του &#39superheated steam&#39 σε Ρωσικά