2020-02-03

## 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 describ​ed. 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: