Volume 40, Issue 5, 2008, Pages 896–905 Proposal for a new hybrid control strategy of a solar desiccant evaporative cooling air handling unita b Received 6 July 2007, Accepted 11 July 2007, Available online 25 July 2007Correctly controlled solar desiccant evaporative cooling is an interesting option for achieving savings in building air-conditioning consumption. The operation of this system (open loop cooling cycle) is strongly influenced by indoor and outdoor air conditions. This influence is characterized using numerical simulations. First the air conditioned room and the cooling system are simulated using a validated model of the desiccant wheel. Then the influence of each parameter of the desiccant air handling unit is evaluated. The third step is to assess the system cooling power for each operating mode with fluctuating outdoor and indoor air conditions. This allows for making relevant choices for a new control strategy taking into account both indoor and outdoor air conditions.

This control strategy is tested for a whole cooling season and compared to a reference compression system with promising results, allowing for energy savings of about 40% for French climate.25 year old ac unitCopyright © 2007 Elsevier B.V. ac unit outside not runningEnergy efficient AC solution: Buckingham Palace Road 123+151, London AC system for Six Semiconductores factory in BrazilSwimming pool AHU for Aquapark Minskcan a window ac unit be inside Air handling units - general Functional sections of AHU Automation and control equipment Compair CF, RW, FREE - general For our modular air handling units a request for selection software AirCalc++ can be sent to aircalc@lindab.si Eurovent modular AHUTÜV Hygiene requirements

Installation and maintenance manual modular AHU Modular & Compact Air Handling Units NEW PRODUCTSOptima2 AHU for air flow volumes up to 19800 m3/h with optimum price / performance ratio more... Compact air handling unit CompAir FREE with integrated reversible cooling system more... Winner of ‘Datacentre Cooling Product of the Year’ in this year’s DCS (Data Centre Solutions) Awards the AireFlow™ is an innovative indirect adiabatic air handling unit, designed for use in data centre environments for optimal efficiency.Available in five footprints between 100 and 440kW, the AireFlow™ is designed for roof and wall connections and requires minimal mechanical cooling, delivering huge free-cooling potential to significantly reduce operational costs.No air mixing within the system prevents contaminants entering your data centre and eliminates the need for 100% DX back up cooling, which can be required in direct units if ambient air is contaminated and cannot be used.

BenefitsModules can be configured up to 440kWMinimal mechanical cooling required significantly decreases system running costsExtensive free-cooling capabilityNo air mixing means 100% DX back up cooling is not necessaryData centre is isolated from outdoor pollutants Integral fresh air inlet for pressurisation and air quality (optional feature), removes need for a separate AHUPUE below 1.1 achievable through full free coolingNo requirement for internal AC units maximising IT footprintBased on London, UK ambient temperatures, systems can achieve 100% free-cooling year round (operating inside the ASHRAE recommended envelope)Water treatment unnecessaryWetted media system means low water storage requirements and consumptionLow maintenance costs – minimal cleaning required FeaturesN+1 redundancyHigh efficiency EC fans with optimised controlAdiabatic saturated media with UV system sterilisationIntegrated fresh air inlet unitG3 / G4 / F7 filtrationIconographic displayEpoxy coated aluminium heat exchanger – highly efficient but robust against corrosionInternal components rated at IP54 or above Coated galvanised steel casing for corrosion protectionAir flow rates of between 3m³/s and 21m³/s achievable on a 220kW unitOptionsAvailable in five footprints between 100 and 440kWCase sizes (H x L x W) 160kW – 4.1m x 5.0m x 2.3m;

220kW – 4.1m x 5.0m x 3.4mSuitable for both wall and roof connections Watch a video of the AireFlow™ in action Watch a product demo of the AireFlow™ What is Free Cooling?Vent-Axia Air Handling Product Range New Mini Direct Drive Range Vent-Axia are leading manufacturers and suppliers of and systems, both in the UK and around the world. For over 75 years, we have led the industry in products, systems and services. Whatever your requirement, budget or setting, Vent-Axia can provide the solution you need. From for the home to large solutions, our wide range features a product for every purpose. Vent-Axia's popular Lo Carbon range combines all the style and durability you expect from a Vent-Axia product with even greater energy efficiency, helping you to make your property as eco friendly as possible. Together with the Lo Carbon range, demand energy recovery ventilation and heat recovery (HRV) and mechanical extract systems are also available to aid new sustainable building projects to adhere to the Code for Sustainable Homes.

In combination with our exceptional ventilation product range we also offer a comprehensive range of heating products ideal to heat your home, our range of electric heating includes, storage heaters and combination storage heaters,  panel heaters, towel rails, portable heating, fan heaters, convector heaters and radiant heating.  Our latest product introduction brings electric underfloor heating to the portfolio, this range consists of electric underfloor heating mats, underfloor heating thermostats, underfloor heating kits and underfloor heating insulation boards to offer a comprehensive solution. In addition to our ever-growing domestic and commercial ventilation ranges, Vent-Axia also supply air curtains, hand dryer products and fume handling/smoke fans. We can also support your air conditioning requirements. Vent-Axia products are available from distributors around the UK and Ireland and also around the world via our network of international distributors. Many of our ranges can also be ordered via our online store.