How do you read refrigerant pressure enthalpy chart?
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.
Which refrigerant has the highest pressure?
∴ Ammonia has the highest critical point pressure.
What is a pressure enthalpy chart?
An enthalpy chart shows the A/C cycle and at what temperature and pressure the refrigerant changes from a gas to a liquid and back to a gas.
What is a pressure-enthalpy diagram for a refrigerant?
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 described. Figure 2.1 shows the principle of a log P/h diagram, and indicates the refrigerant’s various thermodynamic states.
What are Ph diagrams?
A p-h diagram is a figure with a vertical axis of absolute pressure and a horizontal axis of specific enthalpy. It is an important diagram used frequently for a performance calculation of a refrigerating machine. A p-h diagram has a lot of thin lines, whose names and natures are important.
Which refrigerant depletes the ozone layer?
R-22
R-22 is a refrigerant that is often used in air- conditioning equipment. Because R-22 depletes the ozone layer, production and import was further limited in 2010. In 2020, R-22 will no longer be produced or imported.
What is the EER of a R134a?
R22 R134a R290 R407C R507 R410A 0.80 0.85 0.90 0.95 1.00 1.05 1.10 EER Relative to R22
What is 134a refrigerant used for?
Klea ® 134a refrigerant can be used in hybrid cascade systems for supermarkets and is being used in some of the HFO blends in order to bring lower flammability and better efficiency.
What is the critical point of a R134a?
2) R134a R744 Critical Point 214 F 88 F Low Pressure 10-50 psi 110 – 500 psi High Pressure 100-250 psi 750-2000 psi Other CO 2Properties: High throttling losses Solid CO
What are the state variables of tetrafluorethane-R134a?
Some scientific and engineering data online german Calculation of thermodynamic state variables of tetrafluorethane – R134a Lower limit for calculation: -70 C, 1 bar upper limit: 180 C, 300 bar. Pressure:
https://www.youtube.com/watch?v=xteSowq_Ebs