3暖通与空调制冷循环水系统的基本问题闭式循环冷热水系统的主要问题是腐蚀，而敞开式冷却水系统的主要问题则是结垢和腐蚀。3.1闭式循环水系统的主要问题是普遍存在着腐蚀现象，而不是人们所想像的结垢。如天津市河西区某道路改造中将跨道路的架空供热管道拆除时,发现管内壁并没有结垢而是出现全表面腐蚀并伴有点蚀现象；近天津某大学在拆除供热管道时也同样出现上述腐蚀问题，通过调查，得知他们的系统没有采用化学药剂方法进行水处理。所以闭式循环水系统，在工程设计时应首先考虑如何防止系统腐蚀，与此同时，当然还要考虑如何防止系统结垢等问题。针对上述问题应该转变思想观念，将如何防止系统腐蚀放在首位，其次是防止结垢等问题。其理由是：暖通与制冷空调的闭式循环水系统循环水量大、水温低，且设备换热表面温度亦低；因而不会像蒸汽锅炉的炉水那样，会使炉水中各种离子发生浓缩现象。

 Allen Bradley Line Reactor 1321-3RA80-B 80A,IP20,warranty
 ALLEN BRADLEY 1791DSIB16 DEVIC SER A INPUT MODULE D441267
 Allen Bradley 1756-OF6VI /A Pkg 2015 ControlLogix Isolated Output
 1756-DHRIO Allen Bradley 1756-DHR10 ControlLogix DH+/RIO PLC Ser D F/W 6.2
MFG 2015 Factory Seal 2711CT6M Panelviewp C600 Catalog 2711C-T6M Ser C
Allen-Bradley SMC-3 150-C43NBD 152H-C43FBD-45 Motor Controller w/ Enclosure
Allen-Bradley ControlLogix 5555 1756-L55 1756-M14
ALLEN-BRADLEY 8720 MC HIGH PERFORMANCE DRIVE - 8720MC-B048-AA-HA82
Allen-Bradley 1756-DNB/A BRIDGE/SCANNER MODULE DEVIC
Allen-Bradley 1746-NIO4V Lifetime Warranty !!!
Allen Bradley, 1746A10, SLC 500, 10 Slot Chassis
Allen Bradley X1771-IAD X1771IAD Circuit Board - 
ALLEN BRADLEY SP-154966  SP154966
ALLEN BRADLEY POWER FLEX 40P 22D-E4P2N104 SERIES A **
ALLEN BRADLEY MODULE 1794-ID2 SERIES B *FACTORY SEALED*
ALLEN BRADLEY LEM LC500-S/SP7 CURRENT MODULE 1:3000 RATIO 15V ***XLNT***
Allen Bradley Ethe / Ipmunication Module, 2706-PP
Allen Bradley Distributed I/O Block 1791-IOBA Series A 200mA @ 24VDC 10-30 VDC
ALLEN BRADLEY DEVICMUNICATION INTERFACE CARD 1784-PCID SER. A **
ALLEN BRADLEY CONTROLLOGIX PROCESSOR 1756-L55M16 SERIES A LOGIX5555 M16 L55 CPU
Allen BradleyC High Density I/O Module 8500-HDIO
Allen Bradley Circuit Breaker 140M-M5F-D16
Allen Bradley Circuit Board 900451  #35799
ALLEN BRADLEY 871R-D50NP90-D4  871RD50NP90D4
Allen Bradley 855T-B10TC3 Tower Stack Light w/ Bulb (Pack of 3) -  No Box
ALLEN BRADLEY 849-ZOD32  849ZOD32
ALLEN BRADLEY 845K-SADZ24-FWY3  845KSADZ24FWY3
Allen Bradley 845HSJHZ24CTY2 NSNP **GENUINE** AB
ALLEN BRADLEY 845H-SJHZ24CMY2  845HSJHZ24CMY2
ALLEN BRADLEY 845H-SJHZ14-CMY2  845HSJHZ14CMY2
ALLEN BRADLEY 845H-SJFB14DRY2C  845HSJFB14DRY2C
ALLEN BRADLEY 845H-SJEB14DRY2C  845HSJEB14DRY2C
ALLEN BRADLEY 842D-60131331BDA 3.5 OZ-INCH MULTI-TURN ABSOLUTE ENCODER B490984
ALLEN BRADLEY 836T-T351JX9X6  836TT351JX9X6
ALLEN BRADLEY 836T-T303JX9  836TT303JX9
ALLEN BRADLEY 836T-T301JX25  836TT301JX25
ALLEN BRADLEY 836-C3JX221  836C3JX221
ALLEN BRADLEY 815-DOV169  815DOV169
ALLEN BRADLEY 809-A4  809A4
ALLEN BRADLEY 80190-220-01-R  8019022001R
Allen Bradley 800T-XA Contact Block Series D (Pack of 36) -  No Box
ALLEN BRADLEY 800H-2HD  800H2HD
ALLEN BRADLEY 800H-2HCM  800H2HCM
ALLEN BRADLEY 8000-TRAPL  8000TRPL
Allen Bradley 8000-PB Power Supply - Excellent w/ Warrantee !!
ALLEN BRADLEY 8000-GD  8000GD
Allen Bradley 8000AB ENCODER SERVO MODULE 900033 REV-E2 R13744 circuit board
ALLEN BRADLEY 7300-UPG-5  7300UPG5
ALLEN BRADLEY 7300-UPG-3  7300UPG3
ALLEN BRADLEY 7300-UPG-1  7300UPG1
ALLEN BRADLEY 709-DOD-16  709DOD16
ALLEN BRADLEY 700-RM440A1  700RM440A1
ALLEN BRADLEY 634579-01  63457901
ALLEN BRADLEY 600-TCD7  600TCD7
ALLEN BRADLEY 509COD **NIB**
ALLEN BRADLEY 505V-AOD-A2D  505VAODA2D
Allen Bradley 50 OXD105  **GENUINE** AB 505 AOXD 105
Allen Bradley 50 OXA105  **GENUINE** AB 505 AOXA 105
Allen Bradley 50 OD7  **GENUINE** AB
ALLEN BRADLEY 50347-001  50347001
ALLEN BRADLEY 500FL-FOD93 SIZE 5 AC Contactor 300A ,3P, 600V
ALLEN BRADLEY 46715-415-01  4671541501
Allen Bradley 459221-0071 OUTPUT PC BOARD FOR SLC100  No Box
ALLEN BRADLEY 440R-G23067 SERIES A SAFETY RELAY 24/110/230VAC 24VDC
ALLEN BRADLEY 440F-C28013 Sealed Factory Box Series C MATMANAGER
ALLEN BRADLEY 410021-573-01  41002157301
ALLEN BRADLEY 40279-030-54  4027903054
ALLEN BRADLEY 3500-IN2  3500IN2
ALLEN BRADLEY 2801-E1  2801E1
ALLEN BRADLEY 2755-L7RD  2755L7RD
Allen Bradley 2711-K 5 /H PanelView 550 FRN 4.41 Mono/Key/RS-232(DH-485) Qty
Allen Bradley 2711-K 5 /H PanelView 550 FRN 4.41 Mono/Key/RS232(DH-485) Qty
Allen Bradley 2711-K 5 /H PanelView 550 FRN 4.41 Mono/Key/RS-232(DH-485)
ALLEN BRADLEY 2700M-P1A1  2700MP1A1
ALLEN BRADLEY 22D-D2P3N104  22DD2P3N104
ALLEN BRADLEY 22B-D6P0N104 -- 22BD6P0N104
ALLEN BRADLEY 22B-D3P3F104  22BD3P3F104
ALLEN BRADLEY 22A-D4P0N104  22AD4P0N104
ALLEN BRADLEY 22A-D2P3F104  22AD2P3F104
ALLEN BRADLEY 20M-E  2ME
ALLEN BRADLEY 20AD5P0A0AYNANC0  20AD5P0A0AYNANC0
ALLEN BRADLEY 20AD2P1A0AYNNNC0  20AD2P1A0AYNNNC0
Allen Bradley 2098-DSD-HV050-SE /B 2098DSDHV050SE
ALLEN BRADLEY 2094-SE02F-M00-S0  2094SE02FM00S0
ALLEN BRADLEY 193-B1N6  193B1N6
ALLEN BRADLEY 191E-AND3-CB10C-R  191EAND3CB10CR
ALLEN BRADLEY 190-A40A  190A40A
Allen Bradley 1797-RPFM Fiber Repeater Control ! WOW !
ALLEN BRADLEY 1794-OE4 -- 1794OE4
Allen Bradley 1794-L34 /A FlexLogix Processor 512KB Memory F/W 16.22
Allen Bradley 1794IF2XOF21 NSNP **GENUINE** AB 1794 IF2XOF21
Allen Bradley 17941F2XOF21 NSNP **GENUINE** AB 17941 F2XOF21
ALLEN BRADLEY 1791DS-IB12 -FS- 1791DSIB12
Allen Bradley 1791-16BC Module Series B - 
ALLEN BRADLEY 1788-DNBO -FS- 1788DNBO
ALLEN BRADLEY 1785-L80B 1785L80B SERIES E REV A PLC-5 PROCESSOR/CONTROLLER
Allen Bradley 1778-OB DC OUTPUT MODULE 12-24 V IS  WITH A 30 DAY WARRANTY
Allen Bradley 1775-P1 PLC-3 Power Supply Series B 96536804 ST1MU7LW Refurbished
Allen Bradley 1775-P1 PLC-3 Power Supply Series B 96536801 ST0FN1MB Refurbished
ALLEN BRADLEY 1771-RTP3  1771RTP3
Allen Bradley 1771-OG TTL Output Module 1771OG SD0IR2NK - 
Allen Bradley 1771-OG TTL Output Module 1771OG - 
ALLEN BRADLEY 1771-OG  1771OG
ALLEN BRADLEY 1771-IS  1771IS
ALLEN BRADLEY 1771-IQ  1771IQ
ALLEN BRADLEY 1771IFE C 1771-IFE C INPUT ANALOG MODULE
Allen Bradley 1771-IAD Module 1771-1AD SD1HM9UE Ser C 1771-IAD/C - 
Allen Bradley 1771-IAD Module 1771-1AD SD0YX3FC - 
Allen Bradley 1771-IA AC Input Module 120V 1771IA SDOJ0GF -  No Box
Allen Bradley 1771-IA AC Input Module 120V 1771IA SDOEE4TF -  No Box
Allen Bradley 1771-IA AC Input Module 120V 1771IA SDODA3PO -  No Box
Allen Bradley 1771-IA AC Input Module 120V 1771IA SDOCP0ZW -  No Box
Allen Bradley 1771-IA AC Input Module 120V 1771IA SD0AW51X -  No Box
Allen Bradley 1771-IA AC Input Module 120V 1771IA D8520 -  No Box
Allen Bradley 1771-IA AC Input Module 120V 1771IA D8507 -  No Box
Allen Bradley 1771-IA AC Input Module 120V 1771IA D8428 -  No Box
Allen Bradley 1771-IA AC Input Module 120V 1771IA D8423 -  No Box
Allen Bradley 1771-IA AC Input Module 120V 1771IA D8421 -  No Box
Allen Bradley 1771-IA AC Input Module 120V 1771IA D8330 -  No Box
Allen Bradley 1771-IA AC Input Module 120V 1771IA 960096 (Pack of 3) - 
ALLEN BRADLEY 1771-HTT  1771HTT
Allen Bradley 1771-DB Basic Module 1771DB Revision A/F 29940 - 
ALLEN BRADLEY 1770-T12  1770T12
Allen Bradley 1769-OF8V F/W 2.1 SER Apact I/O Factory Sealed 2014
ALLEN BRADLEY 1768-M04SE -FS- 1768M04SE
ALLEN BRADLEY 1761-L32AWA  1761L32AWA
ALLEN BRADLEY 1761-L32AAA  1761L32AAA
ALLEN BRADLEY 1761-L32AAA -MFS- 1761L32AAA
ALLEN BRADLEY 1756-PB72  1756PB72

加之暖通与制冷空调循环水系统的补充水量虽然比较少，但是含有一定量的溶解氧及含盐量，故腐蚀问题已成为首要问题。3.2冷却水系统是一个不利的系统,更应搞好水处理工作。我们曾对某单位的冷却塔进行清洗工作时发现，这个冷却水系统设有一台500t/h的横流式冷却塔，并设有多台电子水处理仪。经过一个夏季的运行后,冷却塔的填料上出现了大量碳酸盐水垢,其厚度约为20～50μm;进出水管道的内壁产生了很明显的氧化铁皮。将清理出的水垢和氧化铁皮收装起来足有6小麻袋。如果不及时清洗的话，将这些水垢、氧化铁皮带进设备，很容易堵塞冷凝器，造成事故停车。后来该单位接受建议，采用自动加药水处理设备，对系统实行化学水处理，结垢问题随之得到了解决。

ALLEN BRADLEY 1756-DNB -- 1756DNB
ALLEN BRADLEY 1756B SERIES D CONTROLMUNICATIONS BRIDGE, 
ALLEN BRADLEY 1747-PIC  1747PIC
ALLEN BRADLEY 1747-OCV-GAE  1747OCVGAE
ALLEN BRADLEY 1747-OCVGA1  1747OCVGA1
ALLEN BRADLEY 1746-P3  1746P3
ALLEN BRADLEY 1746-OBP8  1746OBP8
Allen Bradley 1746-OB32 SLC-500 Digital Output Module with 12 month warranty
ALLEN BRADLEY 1690-N1224  1690N1224
ALLEN BRADLEY 160-BA06NSF1  160BA06NSF1
ALLEN BRADLEY 160-AA12NPS1P1  160AA12NPS1P1
ALLEN BRADLEY 160-AA08NSF1  160AA08NSF1
Allen Bradley 160AA08NPS1P1 NSNP **GENUINE** AB 160 AA08NPS1P1
ALLEN BRADLEY 1606-XLS480E-3 -FS- 1606XLS480E3
ALLEN BRADLEY 1606-XL480E  1606XL480E
ALLEN BRADLEY 150-C16NBD  150C16NBD
ALLEN BRADLEY 1494R-N60  1494RN60
Allen Bradley 1494F-JNC233 ible Disconnect Switch 1494FJNC233 Series A
Allen Bradley 1492-CE Terminal End Block 1492CE (Pack of 120) -  No Box
ALLEN BRADLEY 1400  140
ALLEN BRADLEY 1394AM07 **REP**
ALLEN BRADLEY 1336E-BRF15-AA-EN AC DRIVE 1.5HP ****XLNT****
ALLEN BRADLEY 1336 P II 1336F-BRF20-AA-EN, 1.5kW 2HP MANUFACTURER REFURBISHED
ALLEN BRADLEY 1332-AAC  1332AAC
ALLEN BRADLEY 1326-DPS1C  1326DPS1C
ALLEN BRADLEY 1326-CVU-50  1326CVU50
Allen Bradley 1326-CPC-15 Power Cable
ALLEN BRADLEY 1326-CPC1-005  1326CPC1005
ALLEN BRADLEY 1326-CPB1-015  1326CPB1015
ALLEN BRADLEY 1326-CPAB-30  1326CPAB30
ALLEN BRADLEY 1305-AA04A-HA2  130 A04AHA2
ALLEN BRADLEY 113325  113325
ALLEN BRADLEY 100S-D115ZJ33LC  100SD115ZJ33LC
ALLEN BRADLEY 1000NX163 **NIB**
ALLEN BRADLEY * PROSAFE SINGLE KEY TONGUE INTERLOCK * 44T-MDALE10
Allen Bradley (Factory Sealed 2014) 1761-L20BWB- MicroLogix 1000 Analog
845H-SJHA24CRY2 ALLEN BRADLEY ENCODER 
2711-B6C1 Ser C FRN 4.44 PanelView 600 Allen Bradley HMI Touchscreen Keypad
20-750-UFB-1 Allen Bradley Universal feedback option for PowerFlex 755
2014-15  Sealed 1769-IT6 1769-1T6 Allen Bradleypact IO Input Thermocouple
2014  Sealed 1769-HSC Ser BpactLogix Counter Module Allen Bradley - QTY
2014  Sealed 1763-L16DWD Ser B FW 12 MicroLogix 1100 Controller Allen Bradley
2014  Sealed 1746-P4 A Allen Bradley SLC 500 Power Supply Hi-Capacity Rack
2014  Sealed 1746-NI8 1746-N18 Ser A FW 2.0 SLC 500 Input Card Allen Bradley
2012  Sealed 1769-IR6 1769-1R6pactLogix RTD Input Module Allen Bradley
1746-HSCE
1745-E101 Allen Bradley SLC 100 Expansion Unit
155053 -No Box, Allen-Bradley 1762-L40BWAR Micrologix Controller, Input: 24VD
103H-AFBD2-DB25X ALLEN BRADLEY CIRCUIT BREAKERS REMANUFACTURED
(V55-3) 1  ALLEN BRADLEY 849-ZOD337-C PNEUMATIC TIMING RELAY
(C0) 1  ALLEN BRADLEY 1332-CAB ADTABLE FREQUENCY DRIVE 5HP 460 VAC
#299 Allen Bradley AB Rockwell Automation 2364-SPP01A Bulletin 2364 Board