If the burner is turned off, the reverse process of the moving down the line, within a reasonable process of cooling as water loses its heat to the air surrounding the pan. We can find enthalpy at any temperature of water, finding where the temperature reaches of the heating network and read the enthalpy of a right under this point. For example, 50F water enthalpy 18 BTU/lb. This reading is shown on the graph.
This graph shows the latent heat transfer that occurs when 1 pound 212F boiled water to steam at a constant temperature. We simply add the following graph, for a reasonable heat water. First pointforthe hidden heating process is the last point to an intelligent heating process. This is because once liquid water reaches boiling point, it has incorporated all the heat, it can withstand without changing the state of the state of the gas. It is said to be Saturated liquid. If heat is added, the water temperature does not rise.
Instead, it will start hidden heating process of change of a liquid into a gas (boiling) at the same temperature (212F). The boiling temperature is called the Saturation temperature mechanical refrigeration unit work.
The second point which was posted on 212F and 1150 BTU/lb enthalpy. This marks the end of a hidden process water heating. Starting with the saturated liquid, the whole pound of water and cook couples when it absorbed the additional 970 BTU, the latent heat of vaporization of water.
Connecting the two points, forms a line that describes the hidden heating process per pound of water as it passes from a liquid to a gas. The farther you move in the right direction along this line, the greater the amount of water that turned to vapor.
Since the latent heating process begins in the endpoint sensible heating process, we can add latent heat of vaporization (970 BTU/lb) 180 BTU/ lb for 212F water to find the enthalpy of water as he completes his change in par at 1150 BTU/lb. In the far corner of the line is clean, 212F water; in the far right corner 212F pairs. The graph shows that the water absorbs much more heat in status than the temperature change...
Refrigeration 
