![]() ![]() Superheated Steam - Enthalpy Enthalpy of steam superheated to temperatures above it's boiling point.Steam Entropy Basic steam thermodynamics - entropy diagram.Standardized Enthalpies and Entropies Standardized enthalpies and entropies for some common substances.Saturated Steam - Properties with Imperial Units Steam table with sensible, latent and total heat, and specific volume at different gauge pressures and temperatures.Saturated Steam - Properties for Pressure in Bar Saturated Steam Table with properties like boiling point, specific volume, density, specific enthalpy, specific heat and latent heat of vaporization.Liquids - Latent Heat of Evaporation Latent heat of vaporization for fluids like alcohol, ether, nitrogen, water and more. ![]() ![]() Latent Heat Flow Latent heat is the heat when supplied to or removed from air results in a change in moisture content - the temperature of the air is not changed.Heating Water by Injecting Steam Water can be heated by injecting steam.Evaporative Cooling Evaporative cooling tutorial.Energy Accumulated in Heated Water - kWh The amount of thermal energy stored in heated water.Condensation of Steam - Heat Transfer Heat transfer when steam condensates.Thermodynamics Thermodynamics of steam and condensate systems.Gases and Compressed Air Air, LNG, LPG and other common gas properties, pipeline capacities, sizing of relief valves.Be aware that c ps varies with temperature. T s = superheated steam temperature ( oC)Ĭ ps = 1.860 (kJ/kg oC) at standard atmosphere. H s = enthalpy of superheated steam (kJ/kg)Ĭ ps = specific heat of steam at constant pressure = 1.860 (kJ/kg oC) The specific enthalpy of superheated steam can be calculated from: The energy to evaporate 5 kg of water at atmospheric pressure can be calculated as The energy to evaporate a certain amount of water can be calculated as = 2257 (kJ/kg) Example - Energy to Evaporate Water Specific evaporation enthalpy for water at standard atmosphere is: H e = specific evaporation enthalpy (kJ/kg) The specific enthalpy of evaporation can be calculated from: The value depends on the pressure.įor saturated steam at standard atmosphere - 2) - the specific enthalpy - h g - is 2676 kJ/kg. Specific enthalpy of saturated steam - h g - can be obtained from tables as above. T 0 = refer temperature = 0 ( oC) Specific Enthalpy of Saturated Steam The specific enthalpy of water (in SI units) can be calculated from:Ĭ w = specific heat water (4.19 kJ/kg. At standard atmosphere - 1 bar (14.7 psi) - water starts boiling at 100 oC (212 oF). The value depends on the pressure.įor saturated water at standard atmosphere - 2) -the specific enthalpy - h f - is 419 kJ/kg. Specific enthalpy of saturated water - h f - can be obtained from tables as above. For pressures above the critical point there is no definite transition from liquid to vapor. 2) referrer to water boiling at standard atmosphere.v f - change very little and is also often omitted. Internal energy - u - can be calculated from (2) and is often omitted in tables. suffix - g - referrer to saturated vapor - steam.suffix - f - referrer to saturated liquid.Part of the water vapor - steam - properties can be expressed in a table as:įor full table with Enthalpy and Entropy - rotate the screen! Specific enthalpy is a property of the fluid and can be expressed as: H = specific enthalpy (kJ/kg) Specific Enthalpy EnthalpyĮnthalpy of a system is defined as the mass of the system - m - multiplied by the specific enthalpy - h - of the system and can be expressed as: The most common vapor is evaporated water - steam or moist. The heat required for changing state as evaporation is referred to as latent heat of evaporation. The heat transferred to a substance when temperature changes is often referred to as sensible heat. the vapor heats above the evaporation temperature - super-heating.the liquid evaporate at the evaporation temperature by changing state from fluid to gas.the liquid heats up to the evaporation temperature.When a liquid evaporates its go through a process where ![]()
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