Title :
Transient Humidity Measurements: Part II—Determination of the Characteristics of an Interactive Device
Author :
Yiheng Wang ; Simonson, C.J. ; Besant, R.W. ; Wei Shang
Author_Institution :
Saskatchewan Univ., Saskatoon, Sask.
fDate :
6/1/2007 12:00:00 AM
Abstract :
In this paper, a humidity/temperature transmitter is used to determine the transient response characteristics of a passive interactive moisture transfer device (i.e., a desiccant coated energy wheel) following a step change in humidity and temperature. The output of the transmitter, which is placed downstream of the energy wheel, follows exponential functions with two time constants and includes the combined effects of the device and transmitter. The response of the unknown device needs to be deconvoluted from the measured data to determine the transient characteristics of the device alone. The results in this paper show that the transient moisture characteristics of the interactive device are strongly influenced by the temperature testing conditions. Isothermal test conditions are recommended when determining the moisture characteristics of devices that have a combined heat and moisture transfer interaction
Keywords :
heat transfer; humidity measurement; humidity sensors; interactive devices; transient response; energy wheel; exponential functions; heat transfer interaction; humidity measurements; humidity transmitter; interactive device; isothermal test conditions; moisture transfer interaction; passive interactive moisture transfer device; temperature transmitter; transient response characteristics; Energy measurement; Heat transfer; Humidity measurement; Isothermal processes; Moisture; Temperature; Testing; Transient response; Transmitters; Wheels; Desiccant; energy wheel; experiment; response time; simultaneous heat and mass transfer; step change; time constant; transient testing;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2007.894882
