General Technical InformationVersions<strong>Flexit</strong> air handling units are available in thefollowing versions:- horizontal unit (L). Fitted with connectionnipples at the end for installation in technicalrooms, for example.contamination in the extract air will always betransferred so that it is necessary to be selectivewhen using this recovery technology.The temperature efficiency is approximately75-85%.Outdoor airSealing strip- cabinet unit (S). Fitted with connection nippleson the top for installation in small technicalrooms, for example.The units meet the requirements in EU Directives89/336/EEC and 73/23/EEC.Exhaust airCleaning sectorExtract airSupply airUnit type LUnit type S2. Cross Exchanger(Recuperative)The cross exchanger is a cassette that consistsof a row of aluminium plates. Recovery takesplace as follows:Recovery Systems<strong>Flexit</strong> uses two different recovery technologies:1. Rotor2. Cross exchanger1. Rotor (Regenerative)<strong>Flexit</strong> uses a non-hygroscopic rotor. i.e. the rotordoes not actively emit moisture into the supplyair. This form of recovery takes place as follows:The rotor is a wheel that has a mass of aluminiumwith many ducts. This wheel rotates so thatthe mass absorbs heat from the extract air andtransfers the heat to the supply air. The rotor isdriven by a belt and a motor.Unlike the cross exchanger, the rotor technologyhas no practical problem with condensation andicing up. Therefore drainage is not required.The extract air and supply air exchange heaton separate sides of the aluminium plates. Thehot extract air heats the aluminium and thecold outdoor air then absorbs the heat. As theair flows pass on separate sides of the plates,the extract air and the supply air will neverbe in contact with each other. On accountits properties, this form of recovery involvesminimal transfer of contaminants, which, in turn,means that it can be used in a wide range ofapplications.Using a cross exchanger, moisture maybe condensed out of the extract air. Thiscondensation must be drained away.The temperature efficiency is approximately60-70%.Extract airThe internal pressure ratio in the unit is designedso that transfer of contaminants from the extractair to the supply air is minimal. The rotor has acleaning sector that functions in such a way thatthe rotor mass is “cleaned” with fresh air beforeit supplies its heat to the supply air. Some of theSupply airCross exchangerOutdoor airExhaust air4
Version 2003.12Page 125.02.2004Project dataProjectkatalogCustomer<strong>Flexit</strong>Designed byMarianneInformationLocationAssumptionsAtmospheric pressure 101325 Pa<strong>Air</strong> density 1.200 kg/m³Sound duct in accordance with ISO 5136Ambient sound in accordance with ISO 9614-2Unit specificationType of unit <strong>Flexit</strong> S 30 X E L 230DescriptionSummerWinterInputSupply air flow 500.0 l/s 500.0 l/sRelative humidity of outdoor air 50 % 10 %Total pressure drop of supply duct 250 Pa 250 PaExtract air flow 500.0 l/s 500.0 l/sRelative humidity of extract air 50 % 20 %Total pressure drop of extract duct 250 Pa 250 PaDimensioning outdoor temperature 25.0 °C -25.0 °CExtract temperature 22.0 °C 22.0 °CTechnical specificationWeight 300 kgSupplyExtractFansWinterAdjustment 0 % 0 %Power 0 W 0 WCurrent 0.00 A 0.00 APower factor 0.00 0.00SFP 0.00 kW/(m³/s) 0.00 kW/(m³/s)Temperature increase because of fan 0.0 °C 0.0 °CRPM 0 1/min 0 1/minSummerAdjustment 0 % 0 %Power 0 W 0 WCurrent 0.00 A 0.00 APower factor 0.00 0.00SFP 0.00 kW/(m³/s) 0.00 kW/(m³/s)Temperature increase because of fan 0.0 °C 0.0 °CRPM 0 1/min 0 1/minHeat recoveryTypeWinterTemperature before 0.0 °C 0.0 °CRelative humidity before 0 % 0 %Temperature after 0.0 °C 0.0 °CRelative humidity after 0 % 0 %Pressure drop 0 Pa 0 PaTemperature efficiency 0 % 0 %Humidity efficiency 0 % 0 %SummerTemperature before 0 °C 0 °CRelative humidity before 0 % 0 %Temperature after 0.0 °C 0.0 °CRelative humidity after 0 % 0 %Pressure drop 0 Pa 0 PaTemperature efficiency 0 % 0 %Humidity efficiency 0 % 0 %FilterFilter class EU7 EU7<strong>Flexit</strong> AS Telephone : +47 69 81 00 00 www.flexit.noTeleveien 15 Telefax : +47 69 81 00 80 kundeservice@flexit.no1870 ØrjeNorway94108N-032004-02Version 2003.12Page 225.02.2004All calculations are done with 20% addition at pressure drop across filters.WinterDimension pressure drop 0 Pa 0 PaStart pressure drop 0 Pa 0 PaEnd pressure drop 0 Pa 0 PaSummerDimension pressure drop 0 Pa 0 PaStart pressure drop 0 Pa 0 PaEnd pressure drop 0 Pa 0 PaElectrical afterheaterMax. effect 15.00 kWWinterEffect 0.00 kWTemperature before 0.0 °CTemperature after 0.0 °CSummerEffect 0.00 kWTemperature before 0.0 °CTemperature after 0.0 °CSound data, supplyFrequency band Hz 63 125 250 500 1k 2k 4k 8k TotalSupply duct, winter 0 0 0 0 0 0 0 0 dB 0 dB(A)Supply duct, summer 0 0 0 0 0 0 0 0 dB 0 dB(A)Sound data, extractFrequency band Hz 63 125 250 500 1k 2k 4k 8k TotalExtract duct, winter 0 0 0 0 0 0 0 0 dB 0 dB(A)Extract duct, summer 0 0 0 0 0 0 0 0 dB 0 dB(A)Sound data, ambientFrequency band Hz 63 125 250 500 1k 2k 4k 8k TotalAmbient, winter 0 0 0 0 0 0 0 0 dB 0 dB(A)Ambient, summer 0 0 0 0 0 0 0 0 dB 0 dB(A)LCC CalculationSupply air flow 0.0 l/sExtract air flow 0.0 l/sSupply air temperature 20.0 °CExtract air temperature 22.0 °CAnnual average temperature 0.0 °CCorrect coefficient VAV, supply air 0.01Correct coefficient VAV, extract air 0.01Annual operating time 4000 hPrice of energyElectric 0.000 NOK/kWhHeating 0.000 NOK/kWhAnnual price increaseElectric 3 %Heating 3 %Accounting rate of interest 3 %Operating time 10 yearsDegree hoursDegree hour for heat recovery 0 °ChCorrection for supply temperature 0 °ChCorrection due to freezing 0 °ChDegree hours, total 0 °ChLCC resultskWh NOK/kWh NOKLCC supply air 0 0.000 0LCC exhaust air 0 0.000 0LCC heating 0 0.000 0LCC total 0<strong>Flexit</strong> AS Telephone : +47 69 81 00 00 www.flexit.noTeleveien 15 Telefax : +47 69 81 00 80 kundeservice@flexit.no1870 ØrjeNorwayGeneral Technical InformationRisk of Frost Using a CrossExchangerWhen condensation is precipitated out of theextract air at low outdoor temperatures, thecondensed water will begin to freeze in theexchanger and after a while the exchanger willice up. To prevent the exchanger from icingup, <strong>Flexit</strong> has solved this problem with thedevelopment of the patented thermoguardand can guarantee operation under all climaticconditions including severe cold.InstructionsAll systems are supplied with detailedinstructions covering installation, use andmaintenance.FLEXIT S3 X/TT - A3 X/TTS4 X/TT - A4 X/TTS7 X/TT - A7 X/TTBrukerveiledningLuftbehandlingsaggregatSkapmodeller med varmegjenvinningProperties and Function ofthe ThermoguardTa vare på denne veiledningen for fremtidig brukThe thermoguard is placed inside the crossexchanger at the coldest point and monitorsboth temperature and humidity.There is a risk of frost when:1. Both humidity and cold are present2. The outdoor temperature conditions mean thatthere is a risk of dry ice in the exchanger cassette.Calculation ProgramA program for air handling unit calculations withtechnical data such as sound, air, power, SFP, etc.Deicing can be guaranteed by using a preheater.During deicing, the automatic control will reducethe air flow rate if the preheater is not able tomaintain the temperature in the cassette.Compared with traditional frost monitoringsystems (which switch off the supply air fan at +1°,regardless of whether humidity is present or not),<strong>Flexit</strong>’s solution saves a lot of energy as the unit isnot operated unnecessarily in bypass mode.Extract airOutdoor airTemperaturesensorEnvironmental ClassThe units’ chassis are produced in surfacetreatedsheet steel which meets environmentalclass M2, which covers indoor installation withnormal humidity impact and normal content ofair pollution.Cross exchangerSupply airExhaust airThermoguardCross exchanger with thermoguardEE RegulationElectrical products come under the regulationrelating to scrapped electrical and electronicproducts and are, in this connection, subject toan environmental tax. In connection with futuredisposal, they can be delivered free of chargefor recycling to the nearest dealer or collectionlocation.5
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