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It includes a dry-bulb thermometer, a wet-bulb thermometer and a psychrometric chart - a graph that plots the relationships between the dry and wet-bulb temperature, relative humidity, and dew point at constant pressure.
The precise relative humidity is determined by reading from a psychrometric chart of wet-bulb versus dry-bulb temperatures, or by calculation. Psychrometers are instruments with both a wet-bulb and a dry-bulb thermometer.
By combining the dry bulb and wet bulb temperature in a psychrometric chart or Mollier diagram the state of the humid air can be determined. Lines of constant wet bulb temperatures run diagonally from the upper left to the lower right in the Psychrometric chart.
The state of air with dry bulb temperature 70 o F and relative moisture 60% can be visualized in a psychrometric chart as indicated below: From the chart - the saturation temperature is approximately 61 o F and that the humidity ratio is approximately 66 grains of moisture per pound of dry air.
Use this wet bulb calculator to determine the wet-bulb temperature with humidity and if it is in a safe range.
Determination of wet-bulb temperature on this psychrometric chart follows lines of constant enthalpy, but values are read off the upper, curved, saturation temperature boundary. Specific volume indicates the space occupied by air.
Access this wet bulb calculator to determine the wet bulb and wet bulb globe temperature (WBGT) for indoor and outdoor environments. It is an Ideal tool that helps to assess heat stress, optimize HVAC systems, and ensure worker safety by calculating WBGT temperature.
The WBGT is derived from a combination of temperatures from three thermometers — wet globe for humidity, black globe for solar factor, and dry bulb for the ambient temperature. A wet bulb temperature is measured by taking a thermometer that has a bulb covered by a water-soaked cloth. When air passes over the cloth to evaporate the
ECONet stations directly measure black globe temperature and air temperature, while natural wet bulb temperature is calculated. Natural wet bulb temperature can be calculated in a number of ways. Previously, the SCO was using methodology from Stull (2011) to calculate natural wet bulb temperature.
The wet-bulb temperature is the reading registered by a temperature sensor placed in a moist gas stream and covered with a wetted cloth or wick.