![]() Conditioner cycling includes refrigeration, heaters, and humidity/dehumidification cycles. Short-term conditioner control can be assessed when there are no load changes within the controlled area. This aspect is dependent on the capability of the conditioning equipment and its controls. Within this category, account must be taken for conditioner/controller cycling, day/night and seasonal cycling, and sudden load changes (machinery or lights turning on or off, door openings, etc.). This is the amount of cycling or deviation from set point one would expect from the control sensor’s location. To obtain the true required conditions, a chamber or room must be designed with all three aspects of condition deviation in mind. Add the above to the previously indicated control cycle (☒%) and the net total uncertainty, at any location a test is being performed could be anywhere from +4% to +9% or more.Depending on airflow and heat load location within a room, a relative humidity gradient of +1% to +6% could be expected.The best solid-state relative humidity sensors on the market today have an accuracy of +1% (when properly calibrated).A more comprehensive determination of test conditions can be achieved by considering the following: Instead of being well within the required specification, it is quite possible that the requirement is not being met when the uniformity and sensor accuracy factors are included with the control constancy. ![]()
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