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xkw2005荣誉版主 (文坛精英)
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[交流]
【求助】请大家帮忙算一下这个换热器！
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现在有个疑问 普通的双管程列管换热器，管程与壳程的区别 如图所示，我固定管程介质，只改变壳程介质的流向， 壳程介质的温度和换热情况有什么区别？ 请大家帮忙解答，最好给个例子aspen算一下。 谢谢大家了啊！ |
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kuhailangyu(金币+2,VIP+0):非常感谢，赚到人品了！ 4-15 22:09
xkw2005(金币+20,VIP+0):非常感谢你的帮助，有机会继续请教！ 4-16 21:49
kuhailangyu(金币+2,VIP+0):非常感谢，赚到人品了！ 4-15 22:09
xkw2005(金币+20,VIP+0):非常感谢你的帮助，有机会继续请教！ 4-16 21:49
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这是计算的一个例子，给出两种情况下的计算书，比较一下就知道了。 BLOCK: B1 MODEL: HEATX ----------------------------- HOT SIDE: --------- INLET STREAM: HOTF OUTLET STREAM: HOTP PROPERTY OPTION SET: NRTL RENON (NRTL) / IDEAL GAS COLD SIDE: ---------- INLET STREAM: COLDF OUTLET STREAM: COLDP PROPERTY OPTION SET: NRTL RENON (NRTL) / IDEAL GAS *** MASS AND ENERGY BALANCE *** IN OUT RELATIVE DIFF. TOTAL BALANCE MOLE(KMOL/HR ) 3386.92 3386.92 0.000000E+00 MASS(KG/HR ) 64000.0 64000.0 0.000000E+00 ENTHALPY(MMKCAL/H) -225.537 -225.537 0.000000E+00 *** INPUT DATA *** FLASH SPECS FOR HOT SIDE: TWO PHASE FLASH MAXIMUM NO. ITERATIONS 30 CONVERGENCE TOLERANCE 0.000100000 FLASH SPECS FOR COLD SIDE: TWO PHASE FLASH MAXIMUM NO. ITERATIONS 30 CONVERGENCE TOLERANCE 0.000100000 FLOW DIRECTION AND SPECIFICATION: COUNTERCURRENT HEAT EXCHANGER SPECIFIED COLD OUTLET TEMP SPECIFIED VALUE C 20.0000 LMTD CORRECTION FACTOR 1.00000 PRESSURE SPECIFICATION: HOT SIDE OUTLET PRESSURE BAR 0.0300 COLD SIDE PRESSURE DROP BAR 0.0000 HEAT TRANSFER COEFFICIENT SPECIFICATION: HOT LIQUID COLD LIQUID KCAL/HR-SQM-K 730.8684 HOT 2-PHASE COLD LIQUID KCAL/HR-SQM-K 730.8684 HOT VAPOR COLD LIQUID KCAL/HR-SQM-K 730.8684 HOT LIQUID COLD 2-PHASE KCAL/HR-SQM-K 730.8684 HOT 2-PHASE COLD 2-PHASE KCAL/HR-SQM-K 730.8684 HOT VAPOR COLD 2-PHASE KCAL/HR-SQM-K 730.8684 HOT LIQUID COLD VAPOR KCAL/HR-SQM-K 730.8684 HOT 2-PHASE COLD VAPOR KCAL/HR-SQM-K 730.8684 HOT VAPOR COLD VAPOR KCAL/HR-SQM-K 730.8684 *** OVERALL RESULTS *** STREAMS: -------------------------------------- | | HOTF ----->| HOT |-----> HOTP T= 6.0000D+01 | | T= 2.4077D+01 P= 4.9033D+00 | | P= 3.0000D-02 V= 0.0000D+00 | | V= 5.0798D-02 | | COLDP <-----| COLD |<----- COLDF T= 2.0000D+01 | | T= -8.0000D+00 P= 2.9420D+00 | | P= 2.9420D+00 V= 1.0000D+00 | | V= 0.0000D+00 -------------------------------------- DUTY AND AREA: CALCULATED HEAT DUTY MMKCAL/HR 0.2734 CALCULATED (REQUIRED) AREA SQM 5.9266 ACTUAL EXCHANGER AREA SQM 5.9266 PER CENT OVER-DESIGN 0.0000 HEAT TRANSFER COEFFICIENT: AVERAGE COEFFICIENT (DIRTY) KCAL/HR-SQM-K 730.8684 LOG-MEAN TEMPERATURE DIFFERENCE: LMTD CORRECTION FACTOR 1.0000 LMTD (CORRECTED) C 63.1128 NUMBER OF SHELLS 1 PRESSURE DROP: HOTSIDE, TOTAL BAR 4.8733 COLDSIDE, TOTAL BAR 0.0000 PRESSURE DROP PARAMETER: HOT SIDE: 1509.3 COLD SIDE: 0.00000E+00 *** ZONE RESULTS *** TEMPERATURE LEAVING EACH ZONE: HOT ------------------------------------------------------------- | | | | | HOTF | COND | COND | LIQ | LIQ | HOTP ------> | | | | |------> 60.0 | 59.8| 55.5| 33.8| | 24.1 | | | | | COLDP | VAP | BOIL | BOIL | LIQ | COLDF <------ | | | | |<------ 20.0 | -6.8| -6.8| -6.8| | -8.0 | | | | | ------------------------------------------------------------- COLD ZONE HEAT TRANSFER AND AREA: ZONE HEAT DUTY AREA DTLM AVERAGE U MMKCAL/HR SQM C KCAL/HR-SQM-K 1 0.012 0.3185 52.1607 730.8684 2 0.254 5.3955 64.3803 730.8684 3 0.006 0.1647 50.6131 730.8684 4 0.001 0.0479 36.1395 730.8684 BLOCK: B1 MODEL: HEATX ----------------------------- HOT SIDE: --------- INLET STREAM: HOTF OUTLET STREAM: HOTP PROPERTY OPTION SET: NRTL RENON (NRTL) / IDEAL GAS COLD SIDE: ---------- INLET STREAM: COLDF OUTLET STREAM: COLDP PROPERTY OPTION SET: NRTL RENON (NRTL) / IDEAL GAS *** MASS AND ENERGY BALANCE *** IN OUT RELATIVE DIFF. TOTAL BALANCE MOLE(KMOL/HR ) 3386.92 3386.92 0.000000E+00 MASS(KG/HR ) 64000.0 64000.0 0.000000E+00 ENTHALPY(MMKCAL/H) -225.537 -225.537 0.000000E+00 *** INPUT DATA *** FLASH SPECS FOR HOT SIDE: TWO PHASE FLASH MAXIMUM NO. ITERATIONS 30 CONVERGENCE TOLERANCE 0.000100000 FLASH SPECS FOR COLD SIDE: TWO PHASE FLASH MAXIMUM NO. ITERATIONS 30 CONVERGENCE TOLERANCE 0.000100000 FLOW DIRECTION AND SPECIFICATION: COCURRENT HEAT EXCHANGER SPECIFIED COLD OUTLET TEMP SPECIFIED VALUE C 20.0000 LMTD CORRECTION FACTOR 1.00000 PRESSURE SPECIFICATION: HOT SIDE OUTLET PRESSURE BAR 0.0300 COLD SIDE PRESSURE DROP BAR 0.0000 HEAT TRANSFER COEFFICIENT SPECIFICATION: HOT LIQUID COLD LIQUID KCAL/HR-SQM-K 730.8684 HOT 2-PHASE COLD LIQUID KCAL/HR-SQM-K 730.8684 HOT VAPOR COLD LIQUID KCAL/HR-SQM-K 730.8684 HOT LIQUID COLD 2-PHASE KCAL/HR-SQM-K 730.8684 HOT 2-PHASE COLD 2-PHASE KCAL/HR-SQM-K 730.8684 HOT VAPOR COLD 2-PHASE KCAL/HR-SQM-K 730.8684 HOT LIQUID COLD VAPOR KCAL/HR-SQM-K 730.8684 HOT 2-PHASE COLD VAPOR KCAL/HR-SQM-K 730.8684 HOT VAPOR COLD VAPOR KCAL/HR-SQM-K 730.8684 *** OVERALL RESULTS *** STREAMS: -------------------------------------- | | HOTF ----->| HOT |-----> HOTP T= 6.0000D+01 | | T= 2.4077D+01 P= 4.9033D+00 | | P= 3.0000D-02 V= 0.0000D+00 | | V= 5.0798D-02 | | COLDF ----->| COLD |-----> COLDP T= -8.0000D+00 | | T= 2.0000D+01 P= 2.9420D+00 | | P= 2.9420D+00 V= 0.0000D+00 | | V= 1.0000D+00 -------------------------------------- DUTY AND AREA: CALCULATED HEAT DUTY MMKCAL/HR 0.2734 CALCULATED (REQUIRED) AREA SQM 6.1921 ACTUAL EXCHANGER AREA SQM 6.1921 PER CENT OVER-DESIGN 0.0000 HEAT TRANSFER COEFFICIENT: AVERAGE COEFFICIENT (DIRTY) KCAL/HR-SQM-K 730.8684 LOG-MEAN TEMPERATURE DIFFERENCE: LMTD CORRECTION FACTOR 1.0000 LMTD (CORRECTED) C 60.4075 NUMBER OF SHELLS 1 PRESSURE DROP: HOTSIDE, TOTAL BAR 4.8733 COLDSIDE, TOTAL BAR 0.0000 PRESSURE DROP PARAMETER: HOT SIDE: 1509.3 COLD SIDE: 0.00000E+00 *** ZONE RESULTS *** TEMPERATURE LEAVING EACH ZONE: HOT ------------------------------------------------------------- | | | | | HOTF | COND | COND | COND | LIQ | HOTP ------> | | | | |------> 60.0 | 60.0| 55.5| 55.5| | 24.1 | | | | | COLDF | LIQ | BOIL | VAP | VAP | COLDP ------> | | | | |------> -8.0 | -6.8| -6.8| 3.8| | 20.0 | | | | | ------------------------------------------------------------- COLD ZONE HEAT TRANSFER AND AREA: ZONE HEAT DUTY AREA DTLM AVERAGE U MMKCAL/HR SQM C KCAL/HR-SQM-K 1 0.001 0.0257 67.3738 730.8684 2 0.260 5.5138 64.5116 730.8684 3 0.005 0.1152 56.8169 730.8684 4 0.007 0.5374 18.7346 730.8684 重点是换热器几何尺寸！ |
8楼2009-04-15 09:53:31
xkw2005
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5楼2009-04-11 23:35:38
