- 10 -
PERFORMANCE TESTING
NOTE:
Allow the dehumidifier to run for a minimum of one hour at proper reactivation temperatures and
airflow’s before beginning any performance tests. The dehumidifier set-up sheet or flow schematic will
provide the necessary information on temperatures and pressure values.
The following procedures will outline the steps to performance test the dehumidifier.
1. Check the reactivation inlet temperature using a 50
°
-500
°
F thermometer or other sensible temperature
sensor.
2. Check the reactivation outlet temperature using a 0
°
-220
°
F thermometer or other sensible temperature
sensor.
3. Take the wet bulb* and dry-bulb temperature of the process inlet.
Take readings simultaneously using two 25
°
-125
°
F thermometers.
4. Take the wet-bulb* and dry-bulb temperature of the process outlet using the same thermometers as
in step 3.
*
The thermometers best suited for use in the field are a bimetallic dial type with an eight-inch stem. The
wet-bulb and dry-bulb thermometers should be a matched pair with divisions no less than 1
°
F. The
wet-bulb thermometer requires a full-length sock. The sock should fit tightly on the stem of the
thermometer. Distilled water, cooled to 45
°
or 50
°
F if possible should be used to wet the sock. In taking
the wet-bulb temperature, the wet-bulb thermometer should be placed in the air stream (approximately
1000-FPM velocity) and observed until the lowest stabilized temperature is obtained. It is necessary to
take two or more readings to verify the correct wet-bulb.
THERMOMETERS
Bry-Air P/N
21902 dry-bulb
0
°
-220
°
F
21903 dry-bulb
50
°
-500
°
F
21900 wet-bulb
25
°
-125
°
F
dry-bulb
25
°
-125
°
F (21900 less stock)
In cases of very low humidity (condition below 35 WB) the above procedure may be difficult to apply
accurately. Other instruments may be used to take humidity readings for this performance test. It is
important to use an accurate device to obtain an accurate evaluation of the dryer performance. Most
relative humidity sensors are not accurate below 10%-20% relative humidity. At these conditions, it is
suggested that a laboratory quality dewpoint sensor be used to obtain accurate humidity readings.
If there are any questions about the performance of the Bry-Air dehumidifier completely fill out the
Dehumidifier Test Report Form included with this manual and contact the Bry-Air factory or local sales
representative. The system will be analyzed and proper recommendations returned promptly.
