# Refrigerant Ph Diagram (Part 2)

()

The pressure-enthalpy diagram is the most common graphical tool for analysis and calculation of the heat and work transfer and performance of a refrigeration cycle. The change in pressure can be clearly illustrated on the p-h diagram. Also, both heat and work transfer of various processes can be calculated as the change of enthalpy and at easily shown on the p-h diagram.

P-h enthalpy diagram consist of following lines:

1. Constant pressure lines
2. Constant enthalpy lines
3. Saturation line
4. Isothermal lines
5. Isentropic lines
6. Constant volume lines

Enthalpy “h” is along x-axis and absolute pressure “p” is along the y-axis, both expressed in logarithmic scale. The saturated liquid line separates the sub-cooled liquid from the two-phase region in which vapor and liquid refrigerants coexist. The saturated vapor line separates this two-phase region from the superheated vapor. In the two-phase region, the constant-dryness-fraction quality line subdivides the mixture of vapor and liquid. The constant-temperature lines are nearly vertical in the sub-cooled liquid region. At higher temperatures, they are curves near the saturated liquid line. In two-phase region, the constant temperature lines are horizontal. Also in the superheated region, the constant-entropy lines incline sharply upward, and constant volume lines are flatter. Both are slightly curved.

This article is a continuation of our older article, which was well received by users, so we decided to update the P-H Diagram list and provide you with a more complete list of the world's commercial refrigerants.
You can easily access the high quality refrigerant chart by clicking on the refrigerants listed in the table.

Click on a star to rate it!

Average rating / 5. Vote count:

No votes so far! Be the first to rate this post.

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?