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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?
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; Y& _ c' M9 N1 r4 }' D) u2 g19.8 All appliances provided with supplementary heaters are subjected to the following test0 j: u( \4 E4 j v
under the conditions specified in Clause 11:
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" t9 R) f, S* B) Z6 B o F2 t4 u SAfter the airflow conditions specified are established, the indoor airflow is restricted to such
+ G# u% h2 r/ O5 }an extent that the temperature of the air in the outlet, measured by means of the2 t2 w8 E' S' o b. @/ h- {% ~
thermocouple grid (see 11.3), is 3 K below the temperature obtained after a temperature* v+ S) M+ g$ ^" G. [. A
limiting control, a motor protective device, a pressure switch or similar device operates for
. M9 F8 ?: W- T8 e& m) t( {the first time as a result of slowly restricting the free area of the inlet.& ^# L$ n6 U5 {. n; J) @4 [8 m9 ~
" @' x$ s6 e8 {2 f. c! R# q ^This is achieved if the temperature rise is approximately 1 K per min.
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It is necessary to restrict the free area of the inlet until the first of the protective devices, w' u1 j/ {$ N" i1 V) M: R
operates and then operation is resumed with sufficient restriction so that the temperature of$ s0 L1 U, W4 s* ^
the discharge air is 3 K below the temperature at the moment of cut-off.
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) Y3 L! F2 F5 J: \Appliances are operated at rated voltage or at the upper limit of the rated voltage range." W. X O& w' @8 ?% D
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. |
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