![]() ![]() There are much faster and much, much easier ways to calculate wet-bulb globe temperature.įor regular users of wet bulb globe temperature calculations and regulations, it’s best to use an integrated WBGT calculator service for up-to-date information. With this final calculation, you can calculate WBGT completely. Here, “T” is the temperature in celsius and “rh” represents the relative humidity. This is represented by a rather complex formula (see link): The wet-bulb temperature is the lowest possible temperature that air can be cooled down to by the evaporation of water alone, given constant pressure. When water evaporates into the air it creates a cooling effect, but the amount of this cooling varies depending on the overall air temperature and the relative humidity. While the first two variables are relatively straightforward, to know how to calculate WBGT, you must first be able to answer the question: “What is Wet Bulb Temperature?” Tg = Globe Thermometer Temperature (in Celsius) – this is measured by a thermometer placed in a special black globe to estimate solar radiation without the effects of the light itself In this formula, there are three important variables to note: Wet-bulb globe temperature (in Fahrenheit) is calculated with the following equation: WBGT can even show you when humidity decreases causing a rise in temperature, which is perfect for snowmakers. Wet-bulb globe temperature is an imperative guide for maintaining a proper workload in direct sunlight as well as deterring heat strokes. ![]() ![]() This is especially important as it differs from the heat index, which only accounts for temperature and humidity in its calculation for shaded areas. WBGT is also highly valuable information for high school and collegiate athletics, event venues, OSHA regulated construction, city sports leagues, and military training facilities. If WBGT reaches over 90, the body will become stressed in only 15 minutes and it is especially important to drink plenty of fluids and very frequent breaks in the shade. But if WBGT is between 80-90, the body will stress within 20-45 minutes of work or exercise in direct sunlight, with the time until stress becoming shorter as the wet-bulb globe temperature increases. In this case, if the WBGT was below 80, there are no extra precautions needed. Knowing the wet bulb globe temperature can ensure that players exposed to direct sunlight and the elements will not put a dangerous amount of stress on their bodies, as well as help the coaches know how often breaks and hydration is necessary. To ensure the safety of working conditions, regulations are in place for WBGT monitoring.įor example, during a high school football practice, kids are training their hearts out in the heat of August. Since WBGT is a measure of heat-related stress specifically, it is an important factor to consider anytime people are performing some kind of outdoor activity. To be accurate, one must take a variety of factors into account temperature, humidity, wind speed, sun angle, and cloud cover all affect sunlight, heat, and the stress perceived by the body while subject to the conditions in question. Specifically, WBGT is a measure of stress caused by the heat of direct sunlight. It is more a measure of how the weather feels than the exact weather itself. Wet bulb globe temperature, or WBGT, is a perceived or apparent temperature. ![]()
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