What is a cooling chart?

Cooling takes place in a continuous four -speed process with a high -pressure and low -pressure side. Little boiling liquids are used in the cooling cycle as primary refrigerators. Important thermodynamic properties of these liquids are shown in the refrigerant chart. The graph shows a graph of the substance pressure on temperature and melting, triple and critical points if they occur in the refrigerant working range. Using the graph can choose a refrigerant for the system of interest.

Home refrigerator can demonstrate four steps of the cooling cycle. Three fluids are connected: indoor air, air circulated in the refrigerator and refrigerant - everything that exchanges heat with indirect contact. The refrigerant enters the evaporator, the coil on the back of the refrigerator and absorbs heat from the warm air from the refrigerator, causing the coolest to boil; After releasing the heat into the air in the room, when the heat is released into the air in the room, it compresses again and condenses into a high -pressure liquid. High -speedThe hot liquid refrigerant passes through the expansion valve, causing a sudden drop in pressure and temperature. The cold cold refrigerant liquid is repeated by the evaporator and the cycle is complete.

Thermodynamic refrigerant properties can be displayed either in a cool graph or as a data table. The graph is generally more useful because many other refrigerant can be displayed in one easy visual reference. The refrigerant graph is sometimes referred to as a pressure temperature graph or PT graph. The engineer can use the graph to look for a refrigerant that works at lower pressures to reduce the pressure required for a particular system. However, if the pressures are too low, the compression ratio becomes abnormal, so the compression step is incapable.

The cooling graph shows the temperature and pressure of the refrigerant. It is desirable to work over atmospheric pressure to avoid moisture and air leakage into the system. For this purpose, the boiling point of the refrigerant n should beeven more than the level of system temperature. Critical temperatures and pressure points are also plotted into the refrigerant graph. The system must work significantly under critical values ​​over which the phases of liquids and gas have the same properties.

The

cooling graph is available from refrigerant or cooling equipment. Different types of devices used in refrigeration systems, such as reciproce of devices, absorption units or current current units, require different refrigerators. Most of the links to chemical engineering include a refrigerant graph. Users who are not familiar with the refrigerant due to fears of high -pressure equipment and ongoing environmental regulations concerning chlorinated hydrocarbon coolants.