1/28/2020 High Efficiency & Reliable Fans for Ammonia Refrigeration Application Why do we need a fan? What type of fan should I select and use? How to select the right fan for my application? Presented by: Joachim Dietle ZIEHL-ABEGG SE How to install the fans properly so as to get the optimal joachim.dietle@ziehl-abegg.de performance? Vikas Kundra ZIEHL-ABEGG INDIA PVT LTD. Q&A session vikas.kundra@ziehl-abegg.in 24 Jan 2020 AAR ARCON 24 Jan 2020 AAR ARCON 2020 RAMADA, Navi Mumbai 1 2020 RAMADA, Navi Mumbai 2 Centrifugal air exchange heat transfer humidity pressure fan theory Mix Flow ventilation heating cooling drying Axial move air Cordier-Diagram air flow Fan 24 Jan 2020 AAR ARCON 24 Jan 2020 AAR ARCON 2020 RAMADA, Navi Mumbai 3 2020 RAMADA, Navi Mumbai 4 BP… duty point is intersection of Air Flow Static Pressure resistance curve (of application) Power Supply and Application fan curve Mounting of the fan with air flow direction Power Ambient Operating Temperature Special conditions, if any Please note: Efficiency Power and efficiency are not constant! Name plate data are „worst case“, Air flow volume means taken at maximum power. 24 Jan 2020 AAR ARCON 24 Jan 2020 AAR ARCON 2020 RAMADA, Navi Mumbai 2020 RAMADA, Navi Mumbai 5 6 1
1/28/2020 sound d power = emission 10m Sound Power data is a constant figure. 1m 10m sound pressure = immersion Sound Pressure is a variable (what you hear or measure) Sound pressure or acoustic pressure is figure that depends on the depend on the local pressure deviation from the distance. distance Air flow volume ambient pressure, caused by a sound direction wave transmission reflections 24 Jan 2020 AAR ARCON 24 Jan 2020 AAR ARCON 2020 RAMADA, Navi Mumbai 7 2020 RAMADA, Navi Mumbai 8 air flow dire recti tion: : V air flow ow direc recti tion on: : A Definition of Air Flow blowing over the stator sucking over the stator Volume of the fluid which passes the cross-section A with a mean flow velocity c V q V = = A . c terminals terminals t rotor rotor Variable: q V (old: ) stator stator V m³ 1 m³ Units: 1 = cross-section A h 3600 s m³ 1 = 0.589 cfm h mean flow velocity c 24 Jan 2020 AAR ARCON 24 Jan 2020 AAR ARCON 2020 RAMADA, Navi Mumbai 9 2020 RAMADA, Navi Mumbai 10 Definition (ISO 5801) Fan power demand P 1 L P ( p p ) q fan st d V Static c pressu sure p s (DIN 24163: p st ) Pressure measured at point which is not P fan … Electrical Power of fan influenced by the air flow direction. … total efficiency of fan in duty point Dynamic c press ssure p d P L … air power of fan Stagnation pressure in front of an obstacle q v … air flow ~ mass flow: transport of energy! in air flow direction. Depends on flow ∆ p st … static pressure losses: routing of air flow, heat exchanger, filter,… velocity c and fluid density ρ: ρ ∆p d … dynamic pressure losses: air velocity p 2 c d 2 Airflow is needed or given! Total press ssure p (DIN 24163: p t ) For best system efficiency: = Static pressure p s + dynamic pressure p d • Reduce static pressure • Reduce dynamic pressure Units: 1 Pa = 1 N/m² Pitot static probe: p d = p - p s • 100,000 Pa = 1 bar Increase efficiency of fan • Adapt air flow to demand 24 Jan 2020 AAR ARCON 24 Jan 2020 AAR ARCON 2020 RAMADA, Navi Mumbai 2020 RAMADA, Navi Mumbai 11 12 2
1/28/2020 How do we specify? Engineering design ◦ structural finite element method analysis heat transfer power density efficiency LCC ◦ moldflow simulation power size invest Tests under laboratory conditions life time ◦ shock test temperature acoustics ◦ vibration level investigations specification Fan 24 Jan 2020 AAR ARCON 24 Jan 2020 AAR ARCON 2020 RAMADA, Navi Mumbai 13 2020 RAMADA, Navi Mumbai 14 shock test acc DIN EN 60068-2-27 Durability tests under ◦ normal outdoor exposure ◦ extreme outdoor exposure at shock test acc DIN EN 60068-2-27 Schilthorn (2997 m SL / -30 ° C to at -40°C acc to DIN EN 60068-2-1 +25 ° C) shock in two directions test for at least 17500 h (2 years (axial/radial) non-stop operation) ◦ shock amplitude 15 g ◦ shock duration 11 ms shock tests passed at 22°C shock tests passed at -40°C 24 Jan 2020 AAR ARCON 24 Jan 2020 AAR ARCON 2020 RAMADA, Navi Mumbai 15 2020 RAMADA, Navi Mumbai 16 Efficient = Low Power Consumption Lifetime of a fan depend mainly on operation conditions! - Regular inspection, if necessary with cleaning, is Silent = Low Noise level necessary to prevent imbalance due to ingress of dirt. - Take note of abnormal operating noise! Reliable = Long Life - Watch out for vibration free motion! - If a fan is stationary for long periods in a humid Economical = Lowest Life Cycle Cost atmosphere, it should be switched ON for minimum of two hours every month to remove any moisture. - Ball-bearings service life (approx. 30.000-40.000 h ) - Please consult our service department with regard to changing the bearing as for all other damage 24 Jan 2020 AAR ARCON 24 Jan 2020 AAR ARCON 2020 RAMADA, Navi Mumbai 2020 RAMADA, Navi Mumbai 17 18 3
1/28/2020 rotor Proper Installation of a Fan is very critical to achieve the most optimal performance of the fan stator Factors include: - Inlet cone usage and type - Tip Clearance Guidelines to be followed are presented in the next few slides 24 Jan 2020 AAR ARCON 24 Jan 2020 AAR ARCON 2020 RAMADA, Navi Mumbai 19 2020 RAMADA, Navi Mumbai 20 Air Performance 160 500mm 1~6pol short bell mouth FN050 1~ 6pol Full Bell Mouth Airflow direction FN050 1~ 6pol Short Bell Mouth 140 500mm 1~6pol full bell mouth ZN050 1~ 6pol ZAplus 120 500mm 1~6pol optimized cone 100 p fa [Pa] more pressure Short Bell Mouth Full Bell Mouth 80 more safety Price +++ ++ 60 more air flow Aerodynamic Very good Standard 40 better cooling 20 Acoustic Very good Standard 0 Blade position Inside In - & outside 0 1000 2000 3000 4000 5000 6000 7000 q V [m 3 /h] 24 Jan 2020 AAR ARCON 24 Jan 2020 AAR ARCON 2020 RAMADA, Navi Mumbai 21 2020 RAMADA, Navi Mumbai 22 Power Demand Sound Power (pressure side) 350 FN050 1~ 6pol Full Bell Mouth 81 500mm 1~6pol short bell mouth 500mm 1~6pol short bell mouth FN050 1~ 6pol Full Bell Mouth 340 FN050 1~ 6pol Short Bell Mouth 500mm 1~6pol full bell mouth 79 500mm 1~6pol full bell mouth FN050 1~ 6pol Short Bell Mouth ZN050 1~ 6pol ZAplus 330 ZN050 1~ 6pol ZAplus 500mm 1~6pol optimized cone 77 500mm 1~6pol optimized cone 320 L W DS [dB(A)] 75 310 P M [W] 4 % 300 73 2 dB 290 3,5% 71 5 dB 280 69 270 less noise! safe energy! 67 260 65 250 0 1000 2000 3000 4000 5000 6000 7000 0 1000 2000 3000 4000 5000 6000 7000 q V [m 3 /h] q V [m 3 /h] 24 Jan 2020 AAR ARCON 24 Jan 2020 AAR ARCON 2020 RAMADA, Navi Mumbai 2020 RAMADA, Navi Mumbai 23 24 4
1/28/2020 Blowing or sucking? Blowing or sucking? v sucking tube in evaporator Each tube in evaporator need same amount of energy (heat) to evaporate the refrigerant. Means average air velocity over tube length should be the same! blowing If not point of evaporation isn’t constant. sucking blowing 24 Jan 2020 AAR ARCON 24 Jan 2020 AAR ARCON 2020 RAMADA, Navi Mumbai 25 2020 RAMADA, Navi Mumbai 26 Not only is the proper Installation of a Fan critical but the Advantage Installation of the unit itself is very important to achieve Fan on the cold side the desired performance Disadvantage Cone-sharped air jet Factors include: Circular stream thru coil - Space / Clearance after/ before the unit air flow particular utilization of coil Application • heating Guidelines to be followed are presented in the next few • gas cooler or condenser with slides high temperature Coil heat up air (heater / condenser) 24 Jan 2020 AAR ARCON 24 Jan 2020 AAR ARCON 2020 RAMADA, Navi Mumbai 27 28 2020 RAMADA, Navi Mumbai Low-pressure area Advantage Low-pressure area Airflowdirection „A“ Airflowdirection „V“ differential pressure over coil free air flow into fan, free blowing, maximum utilization of coil mounted upstream of coil fan mounted downstream of coil Disadvantage Fan on the warm side (if coil heat) air flow Application • condenser • evaporator • chiller • heatpump coil 24 Jan 2020 AAR ARCON 24 Jan 2020 AAR ARCON 2020 RAMADA, Navi Mumbai 2020 RAMADA, Navi Mumbai 29 30 5
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