|
请教各位:19.8中“如果温升大约为1K(1℃)/min,则该实验就完成了。”请问,其中的温升指的是谁的温升?其中的试验指的是什么试验?
5 w' T% [) v8 c U% f( j# v U2 x0 l
19.8 All appliances provided with supplementary heaters are subjected to the following test
9 A4 Y$ d- Q* h1 o3 T% p% `under the conditions specified in Clause 11:
?) \* m+ C6 p4 e; g1 j W& Z" c$ k6 y" L
After the airflow conditions specified are established, the indoor airflow is restricted to such$ a. D/ Z* Y( P4 L4 R" i
an extent that the temperature of the air in the outlet, measured by means of the$ r" s, k. y. o6 ?7 \5 q
thermocouple grid (see 11.3), is 3 K below the temperature obtained after a temperature
1 z7 u- I6 [ m7 H6 Dlimiting control, a motor protective device, a pressure switch or similar device operates for* k" a+ K( Y6 p, X
the first time as a result of slowly restricting the free area of the inlet." k% l1 Z7 ?- V! {# ^
1 |! ^# J& B# B8 N+ GThis is achieved if the temperature rise is approximately 1 K per min.
+ |- M( }. }$ z5 h: F0 c4 ?6 D; |; E: l8 f0 m2 k1 h2 L! m- O
It is necessary to restrict the free area of the inlet until the first of the protective devices
7 |3 |) K4 R/ j% {operates and then operation is resumed with sufficient restriction so that the temperature of
* N& g: u* z, n/ Wthe discharge air is 3 K below the temperature at the moment of cut-off.# q5 K3 m% J* O N6 G8 L( `& ?; s
, k4 N+ g* V: u& z( J5 m
Appliances are operated at rated voltage or at the upper limit of the rated voltage range.
4 N V2 `4 ^- @: y/ ]NOTE 101 To facilitate this test, the protective device which has operated may be short-circuited once the temperature at which it operates has been determined. |
|