The enthalpy-entropy diagram, also known as the Mollier diagram, has different technical applications. It is widely used to estimate the enthalpy of pure substances and mixtures of substances most commonly found in engineering. Mollier's table is used to simplify calculations of enthalpy, entropy, pressure, temperature, specific volume and quality of steam and water. The Mollier diagram is the representation of the properties of water and water vapor. A primary HS (Enthalpy-Entropy) coordinate system is used. Say no to plagiarism. Get a tailor-made essay on “Why Violent Video Games Should Not Be Banned”? Get the original essay Source The diagram was created in 1904 when Richard Mollier drew a diagram of total heat versus entropy. During the thermodynamics conference held in Los Angeles in 1923, it was decided to name, in his honor, "Mollier diagram" any thermodynamic diagram in which one of its axes was the enthalpy h. Constant pressure lines and enthalpy lines. The horizontal lines are the lines of constant pressure and the vertical lines are the lines of constant enthalpy, which is the amount of heat present in a kilogram of refrigerant. Note that the pressures are absolute pressures and the scale is logarithmic. Enthalpy. Although enthalpy is sometimes defined as "total heat", it is more accurately and precisely defined as the sum of all the energy provided by a given mass of matter under any thermodynamic condition. The formula for calculating enthalpy is given below.h = u + pv / jWhere:H: enthalpy (kcal/kg)U: internal energy (kcal // kg)P: absolute pressure (kgf/cm2)V : specific volume (m3 / kg)J: equivalent mechanical energy. Saturated liquid line and saturated vapor line. As shown in the following figure, the diagram is divided into three main parts separated by the saturated liquid line and the saturated vapor line. The part to the left of the saturated liquid line is called the “subcooled zone”. At any point in the subcooled zone, the refrigerant is in the liquid state and its temperature is lower than the saturation temperature corresponding to its pressure. The part to the right of the saturated steam line is called the “recharged zone”. In this part, the refrigerant is in the form of superheated vapor. The central part of the table, between the saturated liquid and saturated vapor lines, is called the "phase change zone", which represents the phase change of the refrigerant between the liquid and vapor states. At any point between the two pipes, the refrigerant is in the form of a mixture of liquid and vapor. As seen in the previous figure, the union point between the saturated liquid line and the saturated vapor line is called the “critical point”. The temperature and pressure at this point are called “critical temperature” and “critical pressure” respectively. Critical temperature. The critical temperature of a gas is the highest temperature at which said gas can be condensed by application of pressure. The critical temperature differs between gas types.Dry steam lines. The phase change from liquid to vapor occurs gradually from left to right while the phase change from vapor to liquid occurs from right to left. The mixture of liquid and vapor near the saturated liquid line is an almost pure liquid. In contrast, the mixture of liquid and vapor near the saturated vapor line is almost pure vapor. Keep in mind: this is just a sample. Get now.