Page 11 - National Poultry Newspaper

Mist cooling solutions for piggeries and poultry sheds
☛ from P10
supplied pre-cut with each
end machined to fit inside one of the large range of Quick Fit fittings.
Tube lengths vary de- pending upon the appli- cation, though 1200mm is the accepted length of tube for animal cooling. Quick Fit fittings
These are machined from solid brass and then chrome plated.
They have an internal O ring that seals onto the tube and a grub screw that is tightened to lock into the machined groove on the end.
Nozzles
Our standard size nozzle is 0.2mm with a flow rate of 0.056 litres per minute.
If we say a pump is an Oz125ci, this indicates it is capable of running 125 x 0.2 nozzles at 70 bar or 1000psi.
We also have a 0.15mm nozzle, a 0.3mm nozzle and a 0.5mm nozzle.
The higher the number on the nozzle, the higher the flow rate.
Standard nozzles are chrome-plated brass with a stainless steel face.
We also stock full 316-grade stainless steel nozzles for corrosive en- vironments.
Mist line support
We support most of our systems on 3mm stain- less steel cable, which is then fixed to the building structure and tensioned at either end.
We then cable tie the tube to the cable and support the weight as re- quired.
If the roof trussed are low enough you can fix to the underside.
The Quick Fit stainless steel lines will self-sup- port over 2.5m.
Droppers can also be made from 5mm gal-coat- ed rod with a bend at each end.
FAQs – What sort of temperature reduction can I expect?
The short answer is 10C on the outside ambient.
If you control the cur- tain openings correctly you may get up to 12C. Are pumps single phase or three phase?
All size pumps up to the Oz270 are available in single phase.
Pumps from the Oz125 to the Oz320 are available in three phase.
Three phase are a better choice if available, espe- cially if you have an un- stable power supply.
Why does Ozmist use stainless steel tube when other suppliers use ny- lon tube?
Ozmist made the deci- sion to use stainless steel back in 2010 when our main supplier offered us the Quick Fit system.
At the time we were not happy with the Push Lock fittings available.
After extensive testing we found the stainless steel was very easy to use, was leak free, self-sup- ported over 2.5m without sagging and was not af- fected by sunlight.
Nozzles will never twist as the grub screw locks the fitting in place and the cost between systems is very similar.
Push lock fittings, on the other hand, regularly twist with the pressurising and depressurising of nylon misting lines, sag when not fixed every 500mm, will often leak when first installed and can come apart over time.
Isn’t stainless steel more expensive?
Not really.
A Quick Fit system will work out around the same price but it will be there forever.
It won’t sag and the fit- tings will not twist.
Can multiple sheds be connected to a single pump module?
Yes, as long as the inter- nal ambient temperatures are similar, as you can only use one temperature controller in one shed to run the system.
Another consideration is pump capacity.
The largest pump we build is three phase and will supply 320 x 0.2mm misting nozzles.
The largest single-phase pump can handle 270 noz- zles.
What happens if I want three sheds connected
to one pump but I want to turn one line off? Will this damage the pump unit?
As with any positive- displacement three-piston pump, there needs to be a minimum water flow go- ing through the pump to ensure the head doesn’t overheat and seals are damaged.
Ozmist recommends 60 percent of the maximum discharge.
Ozmist now builds ‘VFD Inverter’ pump modules.
The inverter series are single phase into the in- verter, which runs a three-
phase motor.
A transducer is built
into the system to restrict pump pressure to 70 bar.
If lines are shut down in the system, the transducer restricts the motor rpm to maintain 70 bar.
We can reduce the flow rate down to 30 percent of maximum with no over- heating issues or risk of damage to the pump motor. What is the minimum water pressure and flow rate required at the pump module?
Our pumps require a minimum in-flow pres- sure of 20psi and a flow rate greater than the max- imum output of the pump.
Gravity pressure is rare- ly great enough to satisfy the pressure requirement and a transfer pump will be required.
Can bore, channel or dam water be used?
Water quality is our big- gest problem but it can be
overcome with a series of filters and water condi- tioners.
Where bore/channel water is used, we always recommend the customer fit a Trimline C50 Bag Filter with a 25-micron filter weave.
We also recommend a Care Free Water Condi- tioner is built into the sys- tem to protect from cal- cium and dissolved miner- als in the water.
How do I know how many litres of water per hour my system will use?
Our standard nozzle is known as the 0.2 and has a flow rate of 0.056 litres per minute.
Once you know how many nozzles you have in the system, multiply this by 0.056 to find your litres per minute.
How many misting lines will be required?
When designing a mist- ing line system, we aim
for a 6m minimum spac- ing between lines.
The outside lines clos- est to the side of the building are set in at least 3m.
An example is based on an 18m-wide shed.
We would place the two outer lines 3m off either wall and then a line at 9m.
This would be three lines in total.
Nozzles are normally spaced 1200mm apart. Will the humidity build up in my shed?
Yes, it can.
Each shed is different and getting the maximum benefit out of the system will be determined by the operator on site.
Where normally the cur- tains will close complete- ly on very hot days, with an Ozmist system you will need to open the side with the prevailing breeze up about 500mm.
On the other side you
may have to drop the cur- tain a metre.
By opening the curtains you are allowing fresh air to be sucked through the shed and mix with the treated air, keeping hu- midity levels down.
The height to which you open the curtains will need to be experimented with on site but you quick- ly know what works best. Who installs the sys- tem?
The system can be in- stalled by virtually any- one, with no trade re- quired unless you are connecting to the electri- cal system for the pump power supply.
Tools required: cordless drill and some screws, a 3mm Allen key to bolt the tube and fittings together and a pair of shifters for the nylon tube connections.
You won’t need much more than that in most cases.
Warranty
All items supplied by Ozmist are subject to a 12-month warranty.
On industrial pump modules we offer a two- year warranty (providing services are completed every 500 hours). Anything else I should be aware of?
Don’t over complicate!
There is no need to over design what is a naturally occurring process.
Ozmist has supplied hundreds of systems for cooling anything from alfresco dining areas, factories, workshops and agricultural buildings.
We have provided doz- ens of systems for pig- geries and duck-growing sheds and the same prin- ciples apply.
For any further in- formation and to get in touch, visit ozmist.com. au or call 1300 306 478.
www.poultrynews.com.au
National Poultry Newspaper, November 2018 – Page 11