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Xchanger Inc, webpage Calculator for humidity, dew point, mass flows & heat flux for variable pressure systems with compressors, blowers, vacuum pumps and heat exchangers. Corwin's Calculators Calculator for humidity, dew point. How to read and use a psychrometric chart; Free Online Interactive Psychrometric Chart
The psychrometric constant relates the partial pressure of water in air to the air temperature. This lets one interpolate actual vapor pressure from paired dry and wet thermometer bulb temperature readings.
English: This psychrometric chart represents the acceptable combination of air temperature and humidity values, according to the PMV/PPD method in the ASHRAE 55-2010 Standard. The comfort zone in blue represents the 90% of acceptability, which means the conditions between -0.5 and +0.5 PMV, or PPD < 10%.
γ = Psychrometric constant (γ ≈ 66 Pa K −1) Note: Often, resistances are used rather than conductivities. = & = = where r c refers to the resistance to flux from a vegetation canopy to the extent of some defined boundary layer.
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Also based on the PMV model, this method uses tools such as the ASHRAE Thermal Comfort Tool or the online CBE Thermal Comfort Tool for ASHRAE 55 [2] to evaluate thermal comfort. Users provide operative temperature (or air temperature and mean radiant temperature ), air speed, humidity, metabolic rate, and clothing insulation value, and the tool ...
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