HUMIDIFICATION & DEHUMIDIFICATION
used in conjunction with an existing air handling unit, matching the air volume with the fans in the dehumidifier. In a system which uses recirculation air, a good approach is to place the dehumidifier downstream of the AHU and use the dehumidifier to provide air into the room at the correct humidity level. When using this approach, it is important to note the heat gain across the rotor, as this can cause issues with temperature control when the air reaches the room. This can be counteracted by the use of a post cooling coil which will typically use a chilled water circuit to counteract the heat gain from the main dehumidifier unit. Alternatively, you can use in-room air conditioning to ensure that the air entering the room is at the correct temperature. In a total loss system, however, the loads are typically higher than that of a recirculation system so a different approach can be taken. In this scenario, a dehumidifier can be used before the air reaches the AHU, pre-treating the air to a set absolute humidity value. However, as a result of the larger loads, a pre-cooling coil often proves useful. This pre-cooling coil acts as a refrigerant dehumidifier before the air reaches the desiccant rotor which can sometimes double the total capacity of a system. Following the dehumidifier, the AHU can manage the temperature control, but this must be accounted for when sizing the AHU cooling capacity. To achieve the correct humidity, you must control the absolute humidity level which should be set to the room’s set point. In-room solutions are better when there is no external HVAC system bringing in large amounts of conditioned fresh air. Sometimes it can also be logistically challenging to tap into existing ductwork, so an in-room solution can often be more suitable. When sizing this equipment the key thing to consider is air infiltration as this will be a significant portion of the load that is brought on the system to maintain the set point. Air is typically distributed using ductwork in the space and the humidity is controlled with an in- room sensor.
WHY CHOOSE US -+-
WE UNDERSTAND HUMIDITY CONTROL FOR HVAC PROJECTS
SPECIALISTS
HUMIDITY CONTROL MADE EASY
-+- “Humidity Solutions has very quick lead times, with most of their
products being in stock items and the reliability of their products is fantastic. The staff are always incredibly helpful, knowledgeable and eager to please with a very ‘can do’ attitude. ”
CONTACT OUR EXPERTS E:
info@humiditysolutions.co.uk W:
humiditysolutions.co.uk T: +44 (0)1372 571 200
• Free site surveys • Quick turnaround on quotes • Wide range of humidity control systems in stock • Decades of experience in a variety of industries • Low energy solutions • Free telephone technical support on our systems • Full UK coverage for service and maintenance • Close control of +/-1% relative humidity possible
Read the latest at:
www.bsee.co.uk Humidity Solutions hp BSEE
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