What is a psychrometric chart?

A psychrometric chart is a graphical representation of air properties, which includes various parameters such as dry bulb temperature, wet bulb temperature, relative humidity, specific enthalpy, and more. This chart is essential for understanding the thermodynamic properties of moist air and is widely used in the HVAC industry to design and analyze heating, ventilation, and air conditioning systems.

By using the psychrometric chart, professionals can determine the moisture content of the air and how it changes with different conditions, such as heating or cooling. It also allows for the calculation of processes like humidification and dehumidification, making it a crucial tool for optimizing indoor air quality and energy efficiency in HVAC applications. The other choices represent different concepts—pressure readings pertain more to gauges, while temperature measurement involves thermometers, and airflow calculations utilize different mathematical methods or instruments outside the scope of a psychrometric chart.