Using Interval Timers to Control Evaporative Cooling Pads

Published on: 09/22/2019
Author/s : Michael Czarick 1 and Brian Fairchild 2. / 1 Extension Engineer, University of Georgia; 2 Extension Poultry Scientist, University of Georgia.

  It is fairly common practice to operate evaporative cooling pads off both house temperature and an interval timer. For instance, the evaporative cooling pad pump would be set to turn on once house temperature reaches 82°F, at which time an interval timer would allow the circulation pump to operate a minute or two out of ten. Once the house temperature drops below 81°F, the circulat...

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Ling Yoke Kooi Ling Yoke Kooi
Poultry farmer
September 22, 2019
This helps me understand better in getting best result in tunnel ventilation.
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Maqsood Jaffery Maqsood Jaffery
Doctor of Veterinary Medicine
March 24, 2020
Better understanding of ventilation management for a poultry house under high temperature & high external humidity conditions with energy (electricity) input conservation.
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June 6, 2020
When you install / use a regular House Climate controller an interval timer is included and automatically decide the length from the ON and OFF time from the waterpumps. For example when you program a total cycle of 5 minutes the Controller will “”calculate” the ON and OFF time being depending on the difference between the Temperature setpoint and the actual in-house temperature.
For example: when the temperature inside gets 2 degrees higher as the setpoint than the waterpump will be ON 1 minute and 4 minutes OFF. When inside 2,5 degrees higher as setpoint ( because outside temperature gets higher) after the completion from the 5 minutes*) cycle the waterpump will be ON for 2 minutes etc. etc.. This will continue until the in-house temperature is close to the Setpoint. The PAD-cooling waterpump should never operate continuous adding to much water to the PAD,s increasing the Humidity too fast-too high. At a (too) high humidity inside the house, starting around 70 to 75% the PAD-cooling is loosing his effect and more ventilation ( air velocity) will be needed to cool the BIrds through the “Wind-chill effect”.
*) The length of the mentioned cycle from 5 minutes can be adjusted which depends on the house dimensions, PAD-cooling surface , the total Fan capacity and the specification of PAD-cooling system.
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Dr. Mike Czarick Dr. Mike Czarick
Agricultural Engineer
June 6, 2020
Botter3249 I encourage you to take a little time to read the newsletter a little closer. The house will not reach set point unless you are in a very dry climate. If you are then it is better to split your pad system in to three or four sections each with its own pump. Then you would turn on the systems one by one until the proper temperature is reached.
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