What is a psychrometric chart?

Psychrometric graph is a type of graph that combines air properties with humidity and temperature. It is a complex diagram that maps the relations of several thermodynamic and physical properties of air for a given pressure, often normalized to one standard atmosphere or standard pressure on the sea level. The typical chart can show up to seven different parameters and, if all three of them are known, all other can be read or calculated from the graph and its data. Entalpia, a specific volume and moisture ratio are also included. All these features are represented on the graph and are interconnected, each of which affects others how the values ​​change. The psychrometric chart is useful for predicting the way the masses of air will behave on the basis of certain known characteristics, as well as for the determination of unknown properties, when some properties are known. Environmental management of closed systems such as greenhouses and other buildings can benefit from a psychrometric graph to solve ResSome problems.

A large part of the data is included in the psychrometric chart, all related to the properties of the humid air. The dry bulb temperature is the temperature read from any standard thermometer, while the wet bulb temperature is the temperature shown by the thermometer when the humid air moves along the wet temperature sensor. The difference is an analogous difference in perceived temperature when wearing wet clothing and is affected by relative humidity, which is the amount of humidity suspended in the air.

4 Air ability to maintain humidity is determined by temperature and pressure. As the temperature rises, and the air body is able to maintain more humidity and as the temperature decreases, the air is able to maintain less humidity. Entalpy is the total amount of energy contained in the volume of air and is affected by temperature and dissolved humidity.

Specific volume shows how much space is occupied per unit of weight. Is affected by the amount ofDissolved humidity in the air and its temperature at a given pressure. The moisture ratio is the weight of the dissolved water per unit of the air volume and is closely tied to the relative humidity and the specific volume. All these features are listed on the psychrometric chart and their relationships to each other allow any of them to be read directly from the graph or calculated using established scientific patterns if at least three other values ​​are known. Each graph is calibrated for specific atmospheric pressure, the most common sea level, although it is possible to assemble a graph for any pressure.