标题: 老化箱的换气量 [打印本页] 作者: ANGUIE 时间: 2014-9-17 11:07 标题: 老化箱的换气量 UL标准规定是多少？8 z3 T0 O B- @# r1 P 作者: sc8chen 时间: 2014-9-17 12:30
UL 2556 規定如下:8 S" s& n ~7 q
* I# w& D5 o2 u; M! r. R5 Zi) a forced air-circulating oven. The apparatus for the air-oven aging of specimens shall be as8 E! b+ _: y) J/ H6 T0 l8 c' G
indicated in NMX-J-417-ANCE or ASTM D 5423 (Type II ovens) and ASTM D 5374 and shall& W8 R* u" q2 y
circulate the air within the aging chamber at high velocity. Fresh air is to be admitted, 1 R8 d9 H+ z# v1 ]1 ?; lcontinuously, to the chamber to maintain normal oxygen content in the air surrounding the: f; n9 G) ~ _
specimens. The exhaust ports of the oven shall be adjusted to achieve 100 to 200 complete ! g1 T6 S1 ?, a. p4 I* Nfresh-air changes per hour. For purposes of calculating the number of fresh air changes the ' @8 u, v" @3 L! o2 z. J" m* zvolume of the oven shall be based on the interior dimensions of the oven. The blower, fan, or 2 K5 P6 `) \- k6 u8 M- ]other means for circulating the air shall be located entirely outside the aging chamber. The oven ) {4 X" V4 B! h1 \shall be capable of maintaining the temperature specified in Table 3; / \- v$ P2 m; w$ f) r' k2 ]+ E# `: C6 H