21-51-00
ALL ú ú 04 Page 17 ú Mar 20/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
REHEATER
SEE A
FWD WARM AIR CONDENSER) OUT (TO COOL AIR OUT (TO TURBINE) (FROM HOT AIR IN
SECONDARY
CONDENSER HEAT
SEE B EXCHANGER)
COLD AIR IN
(FROM WATER
BRACKET MOUNT EXTRACTOR) REHEATER
A
SEE C
COLD AIR
WG-621-51-0016
IN FROM
TURBINE
ICE IMPINGEMENT PROTECTIVE FINS
CONDENSER
WARM AIR OUTLET HOT AIR
OUT TO WATER FOR OLD FACE
EXTRACTOR HEADER BAR
COOL AIR CABIN OUT TO REHEATER IN FROM HOT AIR TUBES) AIR BYPASS HEATING (HOT PASSAGE BYPASS COLD AIR BYPASS HOT AIR ANTI-ICE
CONDENSER TUBE
B C
Reheater and Condenser
Figure 7
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-51-00
ALL ú ú 01 Page 18 ú Jun 20/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
G. Condenser (Fig. 7)_________
(1)
Description
(a)
The condenser is a plate-fin, single-pass, cross-flow, air-to-air heat exchanger. The core has two heat transfer matrices, which are separated by a space. The cold air side of the core also has tubes of hot air. Each heat transfer matrix is brazed together as a unit. The housing assembly has two inlets and two outlets. It also has two tubes connected to it. The housing assembly is welded to the core. All the parts of the condensor are made of aluminum alloys.
(2)
Function
(a)
The condensor changes the temperature of two supplies of air. The heat of the air supplies is transmitted through the thin plate-fins. 1) The temperature of the air that flows from the reheater to
the water extractor is decreased. This causes the water in the air to condense so it can be easily removed in the water extractor.
2) The temperature of the air that flows from the turbine outlet to the pack outlet is increased. This causes the air to be above the temperature that would make ice.
(b)
One of the tubes is connected to the hot air inlet of the condensor. The tube supplies hot air from the compressor outlet to the hot air tubes on the cold air side of the condensor. The hot air tubes prevent ice on the cold air inlet of the condensor.
(c)
The other tube is connected to the cold air outlet of the condensor. This tube supplies air pressure to the low-limit-control valve.
H. Water Extractor (Fig. 8)_______________
(1)
Description
(a)
The water extractor has two main parts; the inlet duct and the collector. The inlet duct has a set of helical vanes, brazed to the inner wall of the duct. The helical vanes do not move. The collector has a perforated inner shell, an outer shell, and a sump. The collector isolates the water from the air and collects the water in the sump. Two tubes are connected to the outer shell. A drain tube is connected to the sump. All of the parts of the water extractor are made of aluminum alloys.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-51-00
ALL ú ú 03 Page 19 ú Mar 20/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
SEE B
AIR FROM
FWD CONDENSER
SEE A
PACK TEMP SENSOR (REF)
A AIR TO COLD
SIDE OF
REHEATER
WATER
EXTRACTOR TO WATER SPRAY NOZZLE
AA
AIR FROM PERFORATEDSECONDARYAIR TO HOT INNER SHELLHEAT EXCHANGERSIDE OF REHEATER OUTER SHELL
SPLIT-DUCT WATER SEPARATOR
B
SWIRL VANES
SUMP
A-A
WATER TO SPRAY NOZZLE
Water Extractor
Figure 8
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：757 AMM 飞机维护手册 空调 AIR CONDITIONING 1(165)
