![]() The vacuum pumps maintain a sufficient vacuum in the condenser by extracting air and uncondensed gases. The condenser must maintain a sufficient low vacuum in order to increase the power plant efficiency. to condense steam from steam driven feedwater pumps), engineers use the term “ main condenser“. Since nuclear power plants usually contain also an auxiliary condenser (e.g. There is a main condenser unit under each LP turbine, usually below the turbine with its axis perpendicular to the turbine axis. The exhausted steam from the LP turbines is condensed by passing over tubes containing water from the cooling system. The main steam condenser (MC) system is designed to condense and deaerate the exhaust steam from the main turbine and provide a heat sink for the turbine bypass system. The rate of heat transfer is reduced because of this resistance.Ĭondensation in Power Plants – Main Condensator The film increases a thermal resistance to heat flow between the surface and the vapour. The thickness of the film formed depends on many parameters including orientation of the surface, viscosity, rate of condensation etc. Film condensation results in low heat transfer rates as the film of condensate impedes the heat transfer. In film condensation, the condensate wets the surface and forms a liquid film on the surface that slides down under the influence of gravity. ![]() Condensation occurs when the temperature of a vapor is reduced below its saturation temperature or when the pressure of a vapor is increased above its saturation parameters (see phase diagram of water). Flow processes associated with condensation on a solid surface are almost a mirror image of those involved in boiling. In general, condensation is the change of the physical state of matter from gas phase into liquid phase, and is the reverse of vaporisation. Similarly as in the previous chapter, in this chapter we will discuss heat transfer with phase change, but in this case we will discuss condensation of gas phase (vapor-to-liquid phase change). Film Condensation Phase diagram of water.
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