What is pressure enthalpy diagram?

The pressure-enthalpy diagram (log P/h diagram) is a very useful tool for refrigerant technicians. The area below the saturation lines for liquid and gas (A-CP-B in Figure 2.1) represents the conditions where the refrigerant can change its state of aggregation from liquid to gas or vice versa.

How do you read enthalpy and pressure diagrams?

On the P-H diagram, pressure is indicated on the y-axis and enthalpy is indicated on the x-axis. Typically enthalpy is in units of Btu/lb and pressure is in units of pounds per square inch (psi). The upside down U figure shown on the diagram designates the points at which the refrigerant changes phase.

What is Mollier diagram of steam?

A typical H-S Mollier diagram for a thermodynamic fluid such as steam is shown in Figure 1. Figure 1. The advantages of such a diagram are that vertical lines represent reversible processes and horizontal lines represent lines of constant energy.

How to calculate the specific enthalpy of steam?

Specific evaporation enthalpy for water at standard atmosphere is: The energy to evaporate 5 kg of water at atmospheric pressure can be calculated as The specific enthalpy of superheated steam can be calculated from: cps = 1.860 (kJ/kg oC) at standard atmosphere. Be aware that cps varies with temperature.

What are the pressures of water and steam?

The tabulation is restricted to 1000 and 100 MPa. Defined (and hence, exact) values are printed in boldface. Some metastable states are tabulated for convenient interpolation. These are marked with an asterisk(*) prefixed to the value in the first column. Please see Table 3, pressures upto 0.13 MPa.

What is the specific heat capacity of steam?

Critical Pressure: 22.064 MPa, Critical Temperature 373.95°C. Ideal Gas Constant of Steam: R = 0.4615 kJ/kg.K. Specific Heat Capacity of liquid water: C H2O = 4.18 kJ/kg.°C.

How are enthalpy and entropy related in a H-S diagram?

The h-s diagram is one in which Enthalpy values form the vertical axis and Entropy the horizontal axis. The values of the other related properties may be superimposed in the form of supplementary curves. red lines give the dryness fraction (in the saturated zone).