Fans | Air handling units | Air Distribution Products | Fire Safety | Air Curtains and Heating Products | Tunnel Fans Air Humidifiers For DV Air Handling Units
| Air Humidifiers Air Humidifier DVX For DV Air Handling Units • High humidification efficiency • Maximum performance with minimum operating cost • Simple to install and easy to service Operating principle The operating characteristics of the DVX series are based on the natural effect of water evaporation when air stream passes over a wet surface. Air picks up water vapour which decreases the air temperature since the heat of evaporation comes from the air.
Air Humidifiers Installation example Into an air handling unit The DVX evaporative humidifier is usually incorporated into an air handling unit after the pre-heating coil and before the cooling coil, as illustrated in the photo. The humi difier is serviced down stream. The DVX humidifier can be delivered in all sizes from DV 10 to DV 240. Main typical applications • Comfort air conditioning systems in office buildings, hotels, shops, etc.
| Air Humidifiers DV Air handling unit with single heating coil DV Air handling unit with single heating coil The performance control can be achieved by an ON-OFF hygrostat acting on the pump motor contactor. 1. The air is heated up from -3 °C and 40% RH through the rotary heat exchanger and furthermore through the heating coil until the desired temperature is reached.
Air Humidifiers 2 1 3 5 80 1,00 10 70 15 60 1,05 60 00 Relative humidity [%] 70 80 00 00 90 00 100 00 00 120 00 140 1600 0 20000 40000 Mollier chart for moist air for p = 1 bar 00 55 20 00 50 50 30 2 1,10 40 40 00 45 50 60 Density [kg/m3] 1,1530 3 20 1,20 10 Air temperature [°C] 1,25 30 25 45 40 35 50 ific Spec 60 55 h[ alpy enth 70 65 kJ/kg 3500 ] 3000 20 0 0 70 400 80 90 100 2500 15 10 1,30 1 -10 -16 0 5 0 2000 -5 1 2 3 4 5 6 7 Water
| Air Humidifiers DV Air handling unit with two heating coils The evaporative process into the Mollier chart The illustration on page 7 shows an example of the usual design process for humidification into the Mollier chart with 2 heating coils (pre- and post heating): Starting from outside air at –3 °C and 40% RH to achieve air at 22 ºC and 50% RH. Pre-heating + humidification + post heating See illustration with 1-2-3-4 on page 7. This example has absolute humidity increase from 1.5 g/kg to 8 g/kg.
Air Humidifiers 1 2 3 4 5 80 1,00 10 70 15 60 1,05 60 00 Relative humidity [%] 70 80 00 00 90 00 100 00 00 120 140 00 1600 0 20000 40000 Mollier chart for moist air for p = 1 bar 00 55 20 00 50 50 30 1,10 40 2 40 50 60 Density [kg/m3] 1,1530 20 3 10 1,25 30 25 45 40 35 50 ific Spec 60 55 h[ alpy enth 70 65 kJ/kg 3500 ] 3000 20 0 0 70 400 80 90 100 4 1,20 Air temperature [°C] 00 45 2500 15 10 1,30 5 1 -10 -16 0 0 2000 -5 1 2 3 4 5 6 7
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