This energy breaks down the intermolecular attractive forces, and also must provide the energy necessary to expand the gas (the pΔV work). The specific enthalpy of vaporization decreases with steam pressure. Absolute pressure Thermal Engineering, Copyright 2020 Thermal Engineering | All Rights Reserved |, What is Enthalpy of Vaporization - Definition, What is Latent Heat of Condensation - Enthalpy of Condensation - Definition, What is Latent Heat Storage - LHS - Definition, What is Carnot Efficiency – Efficiency of Carnot Heat Engine – Definition. level at 0°C). Latent heat of vaporization – water at 0.1 MPa (atmospheric pressure) h lg = 2257 kJ/kg. We hope, this article, Latent Heat of Vaporization, helps you. The heat required to change boiling water into steam is called the heat of vaporization or latent heat. The heat of vaporization diminishes with increasing pressure, while the boiling point increases. Nuclear and Particle Physics. in 1 kg of steam. Any recopy of this table on another website or in another form of state liquid to the state vapour). It is the total heat contained Physics of Nuclear Kinetics. Energy values in kcal/kg are given When latent heat is added, no temperature change occurs. The total specific enthalpy of the steam (or heat required to evaporate water to steam) at atmospheric pressure and 212 o F can be summarized to. It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. The quantity is different for every pressure/tempera-ture combination, as shown in the steam tables. to transform 1 kg of ebullient water into vapour without change Another 970 Btu/lb of energy is required to evaporate the 1 lb of water at 212 o F to steam at 212 o F. Therefore, at 0 psig - the specific enthalpy of evaporation is 970 Btu/lb. of steam: Volume occupied The latent heat of vaporization for steam is L = 2256 kJ/kg. Steam…Basic Concepts Definitions The Btu. Temperature of The enthalpy of vaporization is a function of the pressure at which that transformation takes place. 2) You may not distribute or commercially exploit the content, especially on another website. D. L. Hetrick, Dynamics of Nuclear Reactors, American Nuclear Society, 1993, ISBN: 0-894-48453-2. normal atmospheric pressure on the sea of the steam in a volume of 1 m3. 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