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material of enclosure structure of test room is made up of 10mm thick
polyurethane or polystyrene, which has good insulation. There are air
re-treatment motor sets in the test room. Air comes into the room from
the ceiling of porous plate with uniform pressure, so as to assure
airflow speed in the room not over 0.25m/s and thus keep the room
temperature uniformly.
The temperature of test room is adjustable within the range of 10-43℃.
(2) Temperature requirements for different climate freezers please refer to
table 6-1.
Each test point shall keep the stipulated environment temperature, the
fluctuation range is +-0.5K. Within the range of 2m heights away from the
test platform, the vertical temperature gradient shall not exceed 2K/m.
Table 6-1 Different climate sorts for freezers
Climate types Symbols Suitable
temperature (℃)
Measuring
temperature (℃)
Sub-temperate
zone
Temperate zone
Sub-tropical
zone
Tropical zone
SN
N
ST
T
10-32
16-32
18-38
18-43
25
25
25
32
(3) Environmental humidity: normally the relative humidity is 45-75%.
MAINTENANCE SERVICE AND TROUBLE SHOOTING
Maintenance Service and Trouble Shooting
(3) Test pack: Use the rectangle packs of following dimensions as the load
of freezer.
(4) Table 6-2 Test packs for freezer performance
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