Variable speed fans for poultry - Michael Czarick
Ashra Ali Qureshi. When high air exchange rates are required, hot weather, market age birds, the fans can operate at full speed and therefore static pressure is not an issue. The power savings come from all the times when all the fans are not required.
Very interesting to listen. I want to ask Michael Czarick which fan they have used in study?
Although by reducing fan's speed energy cost may be reduced but if we want to keep the same speed of air exchange with variable speed fan at less speed weneed to install more number of fans. I think by increasing number of fans to keep same air exchange the energy cost will increase? Need your opinion..
Dear Sir when you have results, could you please share them.
Normallywe operate fans in a way that as temprature rises other fans turns on, e.g, fan 1 at 21 C, fan 2 at 22 C .....fan 8 at 28C. as temperature drops in night than fans start to turn offf from higher temp to lower, Maybe, I'm not sure but one fan turns off we save 2.5 Amp current. but when speed of all fans decrease we may have little benefit?
On the basis of your research if it will be beneficial than we will voluntarily test at one of our farms.
Regards
Application of this technology in broiler evap. cooling system can be a bonus to the industry. I am sure Dr. Michael Czarick must have considered all the important parameters such as concentrations of carbon dioxide, ammonia, oxygen and RH in addition to the temperature. If not, these parameters could also be integrated into the system.
It is good point in poultry production, I just want to say the increased and decreased speed of fans has advantage and some disadvantage, even I have not like you experiences the increased air speed physically may produce heat and decreased air speed may lead to accumulation of dangerous gases like ammonia, co and co2, and also insincere dust in house.
Variable fan is used during brooding period since you can slow it down to your target windspeed required. Thus helps in the step up minimum ventilation.
The cost of electrical savings depends on the rise and fall of ambient temperature on a positive and negative pressure.
You might enlighten on this? Thanks.
Hello, Dr. Mike. In areas where temp is 48, 50c and the R.humidity is above 85% outside. The variable speed fans wl work good but in the evening and during night variable speed fans wl compromise on b.wts because variable speed draws less air in the farm. On the other side, timer wd these variable fans doesn't work efficiently.
Aoun Khan Climate will have an effect on the payback of variable speed fans. For instance, if I have a breeder or layer house in a hot climate where generally the fans run 24 hours a day for weeks on end, then the variable speed technology would not save much because the fans would be operating at 100% nearly all the time. In contrast, if the fans only operated at 100% a few hours a day, but the rest of the day they would be running at lower speeds, then the variable speed technology could significantly reduce power usage.
Do we need a different type of controller to operate variable speed fans?
Or can we go for a combination of fixed RPM and variable speed fan when the difference of day and night temperature is we.
Syed Farjad Zaidi We have a special intelligent fan control unit. This unit can be installed and needs an input signal from the excising climate controller. The signal must be 0-10Vdc related to the calculated ventilation capacity.
There are several ways, in my opinion, where variable drives can be very helpful. What I don't hear a lot of discussion about is multiple fans on individual drives, which can greatly reduce cost and the ability to correct deficiencies or stratification of air by using drive adjustments.
Electricity costs can be reduced by installing energy efficient fans
or
using fans less...which will not help bird performance
or
keeping fans properly maintained
or
using variable speed technology
Dr. Mike Czarick, thanks for bringing this topic to the forefront. I think variable fan control is underutilized in the poultry and other animal industries. There is so much variability and savings to be had in several area's. Just the use of soft start capability and off the shelf equipment savings are well worth the look. VFD's are great at solving problems and tracking energy usage. They are becoming very competitive to install price-wise while greatly increasing flexibility and control.
Thank you very much, Dr. Czarick for your articles. Can you explain a little bit about the importance of speed controller in this case? I know two kinds of speed controllers - one with voltage reduction and the other will reduce the frequency. I suppose the tension reduction is totally not useful. All the best.
Have one building using all variable speed fans. Cycling between 30% and 100% depending on summer and winter conditions. Ventilation at extremely low temps much more stable and comfortable by elimination of minimum cycling of fans at these temps. Fans are also controllable by automated environmental systems meaning that ventilation can be lowered even during evaporative cooling season increasing cooling efficiency. Another positive is that variable speed fans can be adjusted throughout the building to overcome problems or ventilation deficiencies. I have had no problems with ammonia increases in winter due to the fact that air is always moving and being replaced. There is some negative as far as shutters not fully opening at reduced speeds but not a major issue.
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