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Old October 18th, 2020, 12:55 AM   #1

AB2005 is offline
Join Date: Nov 2006
Location: Soth Asia
Posts: 264
Exh Fans and Blowers Auto control_Which temperature value should be MASTER


In our corrugator plant where the building is pre-fabricated (140M X 130M) and height starts from 6m to up to 13m max, there are many Exh fans and blowers for cross ventilation for which an automation is needed to switch off/on these fans automatically for energy saving point of view.

The outside of department, the temp rises up to max 47c in summer. Inside of department, temperature rises up to max 42c. But if out temp drops below 42c, there is almost 5-10degc temperature difference in between out and inside. For example, this time out temp is 26c and inside temp is 32c & Humidity is 39% and feeling is well. In summer season, the relative humidity also rises upto to 85%. So if for example the inside temp is more than 32c but humidity is > 50%, the Exh fans & blowers should also be working.

As normally operators have no time, no one switch off the fans if temperature is normal, so we are going to install PLC to manage the operation. I am confused which temp value should i consider the MASTER value or BASE value to initiate the work. I am thinking to use this formula;

Avg value = (Outside temp + inside temp + humidity)/3

Then use this average value to start stop the fans. In this way if any of above value changes, system will operate the fans accordingly.

Please share your views. If anyone has already done such kind of project, please share his expert opinion.

Last edited by AB2005; October 18th, 2020 at 12:57 AM.
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