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Latent heat (also known as latent energy or heat of transformation) is energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process—usually a first-order phase transition, like melting or condensation. Latent heat can be understood as hidden energy which is supplied or extracted to change the state ...
In 2015, Yin et al. developed an analytical expression for LCL height using Lambert-W function under the assumption of constant latent heat of vaporization. [1] Separately, in 2017, David Romps derived the explicit and analytic expression for the LCL and the analogous lifting deposition level (LDL) assuming only constant heat capacities: [2]
Temperature-dependency of the heats of vaporization for water, methanol, benzene, and acetone. In thermodynamics, the enthalpy of vaporization (symbol ∆H vap), also known as the (latent) heat of vaporization or heat of evaporation, is the amount of energy that must be added to a liquid substance to transform a quantity of that substance into a gas.
It is a very efficient mode of heat transfer. In layman's terms, saturated steam is at its dew point at the corresponding temperature and pressure. The typical latent heat of vaporization (or condensation) is 970 BTU/lb (2,256 kJ/kg) for saturated steam at atmospheric pressure. [8]
The latent heat release from condensation is the determinant between significant convection and almost no convection at all. The fact that air is generally cooler during winter months, and therefore cannot hold as much water vapor and associated latent heat, is why significant convection (thunderstorms) are infrequent in cooler areas during ...
During condensation, the latent heat of vaporization must be released. The amount of heat is the same as that absorbed during vaporization at the same fluid pressure. [24] There are several types of condensation: Homogeneous condensation, as during the formation of fog. Condensation in direct contact with subcooled liquid.
One of the hot gases produced in the combustion process is water vapour (steam), which arises from burning the hydrogen content of the fuel. A condensing boiler extracts additional heat from the waste gases by condensing this water vapour to liquid water, thus recovering its latent heat of vaporization. A typical increase of efficiency can be ...
Taking a volume of air at temperature T and mixing ratio of r, drying it by condensation will restore energy to the airmass. This will depend on the latent heat release as: + where: : latent heat of evaporation (2400 kJ/kg at 25°C to 2600 kJ/kg at −40°C)