Airedale International announces impending production launch of AireFlow™ indirect fresh air free-cooling adiabatic air handling unit (AHU)
Leading British manufacturer of precision air conditioning systems, chillers, IT and comfort cooling solutions, Airedale International, will shortly be launching its production range of indirect fresh air free-cooling adiabatic air handling units (AHUs).
The AireFlow™ AHU is the result of close collaboration between the product development and engineering teams of both Airedale and UK market-leading manufacturer of custom-built air handling units, Barkell Ltd which became part of the Airedale group earlier in 2014.
With production launch set for autumn 2014, the AireFlow™ offers huge free-cooling potential and, being an indirect system, eliminates the risk of contaminated air entering the data centre. The use of fresh air as the predominant cooling source significantly reduces operational costs for users. In contrast with direct air handling units, indirect cooling solutions also reduce the dependency on back-up mechanical cooling required to prevent contaminated ambient air permeating the data centre. This ensures there is no requirement for internal air conditioning units, therefore maximising IT footprint.
The AireFlow™ will be available in five footprints between 100 and 440kW, each with two separate case sizes depending on whether roof or wall mounted connection is required.
High efficiency, electronically commutated (EC) centrifugal backward-curved fans draw return air from the data centre through the heat exchanger. Cooler air from the outside ambient is drawn through a separate air path within the heat exchanger, also by EC plug fans. This temperature difference drives heat exchange, with the supply temperature being managed through modulation of the ambient air flow rate. EC fan technology delivers improved efficiency, full modulation and reduced power consumption compared with AC fan equivalents, particularly at reduced running speeds.
At any point in the year, as climatic conditions dictate, moisture is added to the warm outdoor air which has the effect of lowering the dry bulb temperature. A typical UK peak summer day for example may have a dry bulb of 35°C with a wet bulb temperature of 21°C. By fully saturating the air, the dry bulb temperature can be reduced to 21°C. This lower air temperature is then used as a cooling medium and, based on London, UK ambient temperatures, could achieve ASHRAE recommended conditions using 100% free-cooling.
In more challenging environments, an optional mechanical cooling module will ‘top-up’ the cooling capacity with a partial DX supplementary cooling section.
An optional integrated fresh air inlet unit provides added installation benefits and reduced footprint compared with other makes of air handling unit in addition to maintaining room pressure and air quality. Air flow and pressure monitoring also allows filter and fan performance to be managed.
Other features of the AireFlow™ include: G3 filtration (return air), G4 filtration (ambient air intake), F7 filtration (fresh air inlet), optional contaminant filtration - NO₂, SO₂, H₂S (fresh air inlet), N+1 redundancy on EC fans and a highly intuitive touchscreen colour user display.
A fully working demonstration unit will be available on Airedale’s Stand No 312 at this year’s DatacenterDynamics, ExCel London ICC, 19 & 20 November 2014.
Watch the following cutting-edge animation that highlights the different operational modes of the AireFlow™ in varying ambient temperatures within a data centre application in the video attached