21. The value indicated by a simple wet-bulb thermometer often provides an adequate approximation of the thermodynamic wet-bulb temperature . 22. Another reason is that the inability of the cooling system to keep dry bulb temperature and humidity constant. 23. The three most important climate considerations are dry-bulb temperature, wet-bulb temperature , and wet-bulb depression during the summer design day. 24. The hand-held device crunches temperature, humidity, wind speed and heat radiating from the ground into a wet bulb temperature . 25. Air-cooled chillers must reject heat at the higher dry-bulb temperature , and thus have a lower average reverse-Carnot cycle effectiveness. 26. The three most important climate considerations are dry-bulb temperature , wet-bulb temperature, and wet-bulb depression during the summer design day. 27. Relative humidity can also be determined by locating the intersection of the wet and dry-bulb temperatures on a psychrometric chart. 28. At some point the air becomes saturated with water vapour ( and has cooled to the thermodynamic wet-bulb temperature ). 29. The precise relative humidity is determined by reading from a psychrometric chart of wet-bulb versus dry-bulb temperatures , or by calculation. 30. Meteorologists and others may use the term " isobaric wet-bulb temperature " to refer to the " thermodynamic wet-bulb temperature ".