![]() ![]() ![]() Air - Humidity Ratio The mass of water vapor present in moist air - to the mass of dry air.Air - Drying Force The drying force of air depends on the air moisture holding capacity and the water surface to air evaporation capacity.Air Psychrometrics Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.Note! - be aware that any water system with an operating temperature between 69 oF (20.5 oC) and 122 oF (50 oC) is a potential legionella source. can be more effective than DX systems at higher temperatures.can be more environmentally friendly than a DX system since they don't contain refrigerants.Evaporation units reduces DX systems run time can be economical since the required size of a DX compressor cooling system can be reduced.In addition evaporation units can be combined with more energy consuming DX (Direct eXpansion) compressor cooling units. Hybrid Evaporative Cooling Systemsĭirect and indirect evaporating cooling units can be combined together in hybrid systems with serial connected indirect and direct evaporative units. The relative humidity of the primary air approaches 86%. ![]() With 100% humidification of the secondary air the dry bulb temperature of the primary air approaches 23.5 oC. The process is indicated in the Mollier diagram below. Indirect Evaporative Cooling Process in the Mollier DiagramĪir at state A with dry bulb temperature 30 oC and relative moisture 60% (state A) is cooled down to state B by a secondary air stream cooled by evaporating water. The relative humidity of the primary air approaches 83%. With 100% humidification of the secondary air the dry bulb temperature of the primary air approaches 70 oF. The process is indicated in the psychrometric chart below. Indirect Evaporative Cooling Process in the Psychrometric ChartĪir at state A with dry bulb temperature 70 oF and relative moisture 60% (state A) is cooled down to state B by a secondary air stream cooled by evaporating of water. Moisture is not added to the primary air and The secondary air stream is then used to cool down the primary air in a heat exchanger. In the indirect evaporative cooling system a secondary air stream is cooled down by evaporating water. With 100% humidification of the air - the dry bulb temperature will approach 23.5 oC. The Direct Evaporative Cooling Process in a Mollier DiagramĪir with dry bulb temperature 30 oC and relative moisture 60% (state A) is cooled down (state B) by evaporating water. With 100% humidification of the air - the dry bulb temperature will approach 61 oF. The Direct Evaporative Cooling Process in a Psychrometric ChartĪir at with dry bulb temperature 70 oF and relative moisture 60% (state A) is cooled down (state B) by evaporating water. ![]() Moisture can be added to the air stream until saturation. The cooled air is circulated by a blower. In a direct evaporative cooling system - outside air is pulled through a water-saturated medium (typical cellulose) - or air is sprayed with water - and cooled by evaporation. hybrid systems with indirect and direct evaporative cooling units.air humidity increase - and air temperature decreaseĮvaporation differs from boiling and can be accomplished at a temperature lower than the boiling temperature of water because it occurs at the liquid-vapor interface.Įvaporative cooling can be implemented with.The evaporation energy comes from the air which is cooled down. When warm, dry and unsaturated air is pulled through a water-saturated medium - water evaporates from the medium to vapor in the air. In principle - the basic evaporating cooling system use only water and a blower to cool circulated air. ![]()
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