Mollier Chart Help: Understanding Entropy Values

[FstBlkBrd]

Mollier Chart HELP !

Hi everyone,

I'm taking a course that requires me to have an understanding of steam tables and the Mollier Chart. I understand the specific volume and enthalpy parts of the tables. I can't seem to wrap my mind around the entropy values listed on the tables, what do those numbers relate to? On the chart, the constant lines on entropy go from 1.0 - 2.0 what do those numbers relate to also. I'm sure this is fairly simple, there just isn't enough Red Bull in my system to overcome my extreme fatigue, lol. Thanks in advance for your help.

Chris

 

[eljose79]

Hi Chris,

I understand your confusion with the entropy values on the Mollier Chart. Entropy is a thermodynamic property that measures the amount of disorder or randomness in a system. In other words, it is a measure of the system's energy that is unavailable for doing work. The entropy values listed on the tables are specific entropy values, which means they are calculated per unit mass of the substance.

The constant lines on the entropy axis represent isentropic processes, which are processes that occur without any change in entropy. The numbers 1.0 - 2.0 on the entropy axis represent the specific entropy values in kJ/kg*K. This means that for every 1 kg of the substance, there is a change in entropy of 1 kJ for every degree Kelvin of temperature change. For example, if the specific entropy value is 1.5 kJ/kg*K, it means that for every 1 kg of the substance, there is a change in entropy of 1.5 kJ for every degree Kelvin of temperature change.

I hope this helps clarify the concept of entropy on the Mollier Chart. If you have any further questions, please don't hesitate to ask. Best of luck with your course!



Scientist

 

[charng]

Hi Chris,

The Mollier Chart is a graphical representation of thermodynamic properties of water and steam. Entropy is one of those properties and is represented by the constant lines on the chart. Entropy is a measure of the disorder or randomness of a system and is related to the amount of heat energy that is converted into work during a process. The values listed on the chart correspond to the entropy of water and steam at different temperatures and pressures. The constant lines on the chart represent the different values of entropy, with the lines closer together indicating a smaller change in entropy and the lines further apart indicating a larger change in entropy.

The numbers on the constant lines of entropy, such as 1.0 - 2.0, represent the entropy values in units of kJ/kg*K. This means that for every kilogram of water or steam, there is a certain amount of heat energy required to increase the entropy by 1 K (Kelvin). This value can be used to calculate the amount of heat energy required for a process involving water or steam.

I hope this helps to clarify the meaning and significance of entropy values on the Mollier Chart. If you have any further questions, please don't hesitate to ask. Keep up the good work in your course!