EC axial fans for agricultural ventilation

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Energy comparison: axial fans size 800The controlled ventilation of agricultural sheds is carried out primarily using axial fans. The fans are driven using single-phase asynchronous motorsinstalled in the hub, with speeds that are adjusted by changing the supply voltage. The disadvantage of this system is the relatively poor energybalance. New motor and control configurations provide a significant improvement in energy balance. The following comparison between a conventionalasynchronous fan and a GreenTech EC fan demonstrates this impressively.AC axial fan GreenTech EC axial fanExternal rotor technologyAsynchronous motor / AC motorPermanent magnet motor / GreenTech EC motorExternal voltage controlIntegrated frequency inverter control3~400 V 1~230 VComparison: 15.800 m 3 /h@ 30 Pa and partial-load operationp sf Pa1009080706050403020100,04 0,08 0,12 0,16 0,20 0,24 0,28 0,32 0,36 0,40 in H 2 O0q V25%50%75%100%2000 40006000 8000 cfm4000 8000 12000 16000 m 3 /hLoad profileTime h/a30002500200015001000500276035002000500Air flow25 50 75 100%6
Energy comparison: axial fans size 800If both fans are operated over the year with the specified load profile, theGreenTech EC fan provides significant cost savings. This is shown in thefollowing image as a function of the energy costs. For example, if theelectricity price is 0.10 EUR per kWh, annual savings of 149 EUR can beexpected.¤25020015014916417919420922323825326828329810050Savingper year0,10 0,11 0,12 0,13 0,14 0,15 0,16 0,17 0,18 0,19 0,20Electricity rate¤/kWhFigure: Annual savings as a function of the energy costsThe following figure provides the view over a longer period. Here, theannual operating costs of both fan concepts are added up over the years.The load profile shown above also served as the basis for the calculationhere. The energy costs have been set at 0.10 EUR per kWh.¤20001500AC1000EC500CostsTime1 2 3 4 5 6 7 8YearsFigure: Operating costs over time at 0.10 EUR/kWhThe specific output of fans is an important and widely used statistic fortheir efficiency. This is shown by the power requirement in watts relativeto a delivery volume of 1000 m³/h . The graph shows the specific outputof both fan concepts, starting at the design operating point of 15.800 m³/h@ 30Pa. The GreenTech EC technology shows its advantages particularlywell in partial-load operation, i.e. at reduced speed. That is preciselywhere barn fans are primarily operated. Another reason to decide in favourof groundbreaking EC technology.40302010ECACWatt per1000 m3/hq V 5000 10000 15000 m 3 /hFigure: Comparison of specific fan power7
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EC axial fans for agricultural ventilation

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