超声雾化加湿系统英文文献和中文翻译(7)

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and temperature (8C). Measurements have been made at around 2-min intervals and 125 measurements were taken. There was no temperature controller in the incubator. Test results showed that the desired humid- ity level can easily be provided up to 90% RH. Another purpose of the test was to show that the temperature was kept constant. Temperature changes of the incubator chamber using three thermometers ex- plained above show the constant values. Test results showed that there is a small difference between them (figure 8), since the sensors used have different response times. Another important parameter is the temperature of the incubator environment. Since any heater is not used for humidifying, any extra heating does not occur. Therefore, the temperature of the incubator environment is not affected by the humidify- ing processes and it was a constant at 22.88 C during the performance test (figure 8).

The second test is on the low RH. In this experiment, the desired humidity of the incubator environment was set to 30% RH via a UP button on the control panel. The temperature of the incubator environment was measured as 19.48 C and the humidity measured was 23% RH initially. Test results showed that there is small difference between them as shown in figure 9, since the used sensors have different response times. Tempera- ture was not affected by the humidifying processes. Since the ambient temperature changed, there were small changing in the range 19.4 – 20.18C (figure 9). In addition, the response lines in figure 9 are considerably similar and indicate an offset between the two sensors. The another reason for this is the difference between the response time of the sensors.

Another test is the middle humidity level test. It can be easily reached at the 50% RH level in the incubator environment (figure 10). Before the humidifying processes, the initial temperature and RH of the incubator environment were measured as 18.88C and 29% RH respectively. The desired humidity level in the incubator environment was set to 50% RH via a keyboard on the control panel to humidify the incubator environment. After the humidifying process was started, the humidity level of the incubator environment quickly increased and it reached 50%

RH in 11 min. Since the response time of the IC-type humidity sensor was around 15 s, the humidity level increased further and reached an RH of 53.3%. This overshoot was due to the lag in the system (15 s). The humidifying processes continued with small fluctua- tions in these values, and the temperature of the incubator environment was not affected by this process (figure 10).

The last test was the high humidity level test. In this experiment, the desired humidity in the incubator environment was set to 70% via the keyboard on the control unit. Since the temperature of the control environment was in the range 18.9 – 19.18C, it was not possible to provide this RH level in these temperature range any other route. However, using the developed system, the desired humidity level was easily reached in 22 min (figure 11). The RH levels of the incubator environment were measured in the air at ambient temperatures. However, the system had not been tested with air at a temperature closer to that used normally in an incubator, say about 368C, where the absolute humidity levels would have been required to attain the same RH. In addition, it is very difficult to cope when a baby is also in the incubator, when it is producing heat and moisture, and when the air is actively warmed, i.e. in a dynamic rather than a stable