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System and method for adjusting fractional on-time and cycle time to compensate for weather extremes and meet ventilation requirements

  • US 9,874,366 B2
  • Filed: 07/29/2015
  • Issued: 01/23/2018
  • Est. Priority Date: 07/30/2014
  • Status: Active Grant
First Claim
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1. A method for providing ventilation, the method comprising:

  • determining a comprehensive target cycle time, whereby the comprehensive target cycle time is determined as a function of a first incremental target cycle time using the following equation;

    the comprehensive target cycle time (minutes)=(0.613*(the first incremental target cycle time (minutes)/60)+0.341)*60*24;

    obtaining a first measure of a control variable useable to determine preferable ventilation timing;

    comparing the first measure to a predetermined value or range of values for the control variable;

    determining whether to initiate or continue ventilation based on (a) the comparison of the first measure to the predetermined value or range of values for the control variable, (b) the value of an incremental target cycle time counter relative to the first incremental target cycle time, and (c) the value of a comprehensive target cycle time counter relative to the comprehensive target cycle time; and

    operating a ventilation fan to ventilate an indoor environment, provided the first measure is equal to the predetermined value and/or within the predetermined range of values for the control variable, until a change in value of the incremental cycle time counter equals the first incremental target cycle time or a change in value of the comprehensive target cycle time counter reaches equals the comprehensive target cycle time.

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