On the HVAC & Refrigeration PE Exam you must have a deep understanding of the pressure-enthalpy diagram. This guide will take you through the vapor-compression cycle to better understand the P-H diagram.

Online Interactive p-H and T-s Diagram. Please allow more processing time for mixed refrigerant.

The log p-h diagram plots the logarithmic pressure (p) against the enthalpy (h) of the refrigerant, providing a comprehensive view of the refrigerant’s state changes during the refrigeration cycle.

The pressure-enthalpy diagram (log P/h diagram) is a very useful tool for refrigerant technicians. First, an explanation of how the diagram is built up is given, and then its use is describ ed. Figure 2.1 shows the principle of a log P/h diagram, and indicates the refrigerant's various thermodynamic states.

Mar 22, 2023 · With our newfound knowledge of how to read the P-H diagram, we can easily see that the compressor increases the pressure of the refrigerant, since the line is moving up. The compressor also superheats the refrigerant a bit, since the line moves out to the right of the saturation dome.

refrigeration system can be plotted on the P-H diagram. Lets assume our system is operating at a -20ºF evaporator and 100ºF condensing. The saturated vapor entering the compressor suction would be at -20ºF, illustrated by point #1 in Fig. 3. The vapor is com-pressed, following the constant entropy line to the pressure cor-

Pressure Enthalpy (P-h) Diagram. A Pressure Enthalpy P-h diagram exhibits the same features as a P-n diagram. Figure 11 is the P-h diagram for pure water. A P-h diagram can be constructed for any pure substance.Like the P-n diagram, there are regions on a P-h diagram in which two phases exist together.

A pressure-enthalpy diagram, also known as a P-H diagram, is a graphical representation of the thermodynamic properties of a substance. It is commonly used in the field of refrigeration to analyze and design refrigeration cycles.

A p-h diagram, or pressure-enthalpy diagram, is a graphical representation used to depict the thermodynamic properties of substances, particularly in the context of refrigeration cycles.

The log ph diagram for different refrigerants, including R134a, CO2 (R744) and R1234yf. use online interactive. Test now!