CONCLUSION
· The design of automatic incubator was started from
investigating heat transfer characteristics of
incubator cabinet. Mathematical model of cabinet
was created and referred. After studying the
affecting factor for incubator, materials, size and
other instrument were selected. The thermophysical
properties of selected materials were
replaced to the equation of the incubator model to
predict the possible of construction. From the
calculating, the result showed that selected
materials; such as zinc sheet, plywood and acrylic
plastic sheet, were suitability to construct the
incubator cabinet. As shown in Fig. 4, the result
from the model was good agreement with the result
of the experiment
· The accuracy of measuring instruments were
determined by using mercury thermometer and
Testo 625 as standard. The error of temperature
sensor was less than 1.1%, whereat error of humidity
sensor was under 5.3%. It meant that measure sensor
used in the incubator was acceptable instrument