2006-2007 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Wang, SW

Xu, XH

2006-2007 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishedVoR allowe

PolyU Institutional Repository

[ ????] 1002-8528(2007)02-0076-04中央空调海水冷却系统自适应优化控制徐新华 ,王盛卫(香港理工大学 屋宇设备工程学系 ,香港)[ ?　?] ?????????? , ????????????????。?????????? , ??????????????????????????????。?????????????????????????????????????????????????????? , ????????????????????????????。??????????????? ,????????。[ ???] ??????;????;????;???????;??[ ?????] TU831.3 +1　　　[ ?????] AAdaptive Optimal Control of Seawater Cooling System in Centralized Air-conditioningSystemXU Xin-hua ,WANGSheng-wei(Department of Building Services Engineering , The Hong Kong Polytechnic University , Hong Kong , China)[ Abstract] Seawater is usually used to cool down condensers in centralized air-conditioning systems in Hong Kong where the fresh wateris very scarce.Optimal control is among the means to improve energy efficiency in air-conditioning system.This paper presents an adaptiveoptimal control strategy to optimize the seawater pressure set-point of variable-speed seawater pumps aiming at minimal energy consumptions.This optimization is achieved by adjusting the pressure set-point according to the estimated derivative of the total power with respect to seawaterpressure differential.This strategy is validated using simulations.The tests show that significant saving in the overall energy consumption of thechilling system can be achieved by properly resetting the pressure set-point only.[ Keywords] centralized air-conditioning system;seawater cooling;pressure differential resetting;adaptive optimal control;energyefficiency[????] 2006-09-18[????] ???(1972-),? ,?? ,???[????] bexhxu@polyu.edu.hk1　?　???????????????? 。???????????(Building Management System , BMS)????????????? DDC ????????????? BMS???? ,?BMS ?????????????。?????????????????????????????????? 。?????????????????????? ,??????????????????[ 3 , 5] 。???????????????? ,??????????????????????????? ,??????? ,?????????????????????? 。?????????????????????????????????。?????????? ,??????????。????????? ,???? ,??????????? ,?????????????。????????? ,????????? ,????????????????。?????????????? ,???????????? ,????。???????????? ,????????????????????? ,??????????????????????????????。????????? ,?????????????????????。????????????????? ,??????????????????????????????? ,????????????[ 3 , 6] 。??????? ,??????????????????????????????????????[ 2 , 4] 。?????????? 23 ?? 2?2007 ?2 ?建　筑　科　学BUILDING SCIENCEVol.23 , No.2Feb.2007DOI :10.13614/j.cnki.11-1962/tu.2007.02.017????????????????????????? 。??????????????? ,????????。2　????????????????1???????????????????????????? BMS ???。?????????????? DDC ?????。????????????????????? ,??????????????????????????。??????????????????????? ,?????????????????????????????。PID????????????????????????? ,??????????????????。????? 、?????????????? ,??????????????????? 。?????????? ,???????????? 、?????????????????????????????。? 1　???????????????　　　????????????????????????? ,???????? ,?????? ,?????????? ,??????。??????????? ,?????????????????。???????????? ,??????? ,????????????。???(1)?? ,????????????????????????????????????????????????? 。???????????? ,???????????? ,?????????(UA)、???????(???????),???????????。?????????????(2)?? ,???????? ,???????????????????(3)～ (5)??。 Wtot P = Wp P + Wc P (1) Wc P = Wc Tw , cd · Tw , cd UA · UA P (2)UA ·Tm =Q (3)Tm ≈(Tw , cd1 -T sea2)+(Tw , cd -T sea1)2(4) Tw , cd UA ≈-TmUA(5)　　?? T sea1 , Tsea2????????????? ,Tw , cd1 , Tw , cd??????????????????。????????????? ,??(4)???????????。????? 、????????? 、???????????? ,?????????????? ,??????????????77? 2? ??? , ?:???????????????????????(5)?? 。??(3)??? Tm +UA Tm  UA =0;??(4)??? Tm  UA = Tw , cd  UA ,?????????????????;??????????? ,??(4)???? Tw , cd1  UA= Tw , cd  UA 。???(6)?? ,????????????????????????????????? ,?????????????? 。??(6)??????(C)???????????????? ,?????????????????。??????????? ,??????????????? 。?? ,?????????????????????(7)???。?????????? ,???????????????? 、???????????? ,??????????? 、????????????。????????????????? ,??(7)???(8)。 Wc Tw , cd ≈C ·Wc (6) Wtot P ≈dWpdP+C·Wc · -TmUA·dUAdP(7) Wtot P ≈ d ∑Npi=1WpdP+∑Nci=1Ci ·Wc , i· -Tm , iUAi· dUAdP(8)3　????????????????????? 、?????????? ,??????(???????????????????????)?????????????? 。??????????? ,????????????? 、???????????????????? ,?????????????? 。???? ,??????????????????????????(9)?(10)。??????????????????[ 1] 。????????????????????(11)?(12)??。UA(t)=[ b0(t), b1(t), b2(t)] ·[ 1 , P(t), P(t)2 ] T(9)Wp(t)=[ c0(t), c1(t), c2(t)] ·[ 1 , P(t), P(t)2 ] T(10)  UA P (i)= bi(i)+2· b2(i)·P(i) (11)  Wp P (i)= c1(i)+2· c2(i)·P(i) (12)　　? 2????????????????。???????????? UA  P 、 Wp  P 、UA 、Tm???????? Wc ??????。?????? ,?????????????????????? 。???????????? ,??????????????????;???????????(????)? ,??????????????????;??????????????????? ,???????????????;??????????????????? ,???????????????;????????? ,?????????。???????????????????? 。??????????? ,?????????????? ,???????????????????。? 2　?????????????　4　?　????????????????4?????? ,????3??? 。??????? ,???????????? ,????????? ,????????????????。? 3????“??”??? ,??????????????????。???????? ,??????????? ,???????????。???????????????????? ,????????????????????????? 。???????? ,??????????? 。????????78 建 筑 科 学 ? 23???? ,4???????? ,???????????????????????。??????????? 16:00? ,??????????????。???????? ,???????? ,?????????????? 。? 3　????????????(??)　? 1　????????????????????????? ??????? 106kJ??? 106kJ???+??? 106 kJ???????? %?? 6.31 41.90 48.21 0.00?? ?? 16.39 38.72 55.11 +14.31(??) ????? 6.44 41.77 48.21 —?? 6.30 80.71 87.01 +5.15????-Ⅰ ?? 16.20 71.59 87.79 +6.10(??) ????? 8.60 74.14 82.75 —?? 9.00 109.74 118.74 +1.70????-Ⅱ ?? 23.42 100.36 123.78 6.02(??) ????? 11.16 105.59 116.75 —?? 9.29 146.00 155.29 +3.83?? ?? 24.18 130.88 155.06 +3.68(??) ????? 13.34 136.36 149.70 —?1????????????????????????。???“??”????? ,?????????????????????? ,????????????????? 3.83%?3.68%????;?“????-Ⅱ”????? ,?　???????????????? 1.7%?6.01%????;?“????-Ⅰ”????? ,???????? 5.15%? 6.1%;?“??”??? ,????????????????????????? ,???????? ,?????????????????????? 14.31%????。????????????????????? ,??????????????。??? BMS ???????????????????。5　?　???????????????????? ,?????????????? ,??????????????????????????? ,????????????。??????????????????????????????? ,??? BMS??????????? ,????????????????????????? 。[????][ 1 ] 　Astron KL ,Wittenmark.Adaptive Control , Second edition , AddisonWesley[M] .1995.[ 2 ] 　Hegberg RA.Converting constant-speed hydraulic pumping systems tovariable-speed pumping[ J] .ASHRAE Transactions , 1991 , 97(1):739～ 745.[ 3 ] 　Kaya A.Improving effi ciency in existing chiller with optimizationtechnology[ J] .ASHRAE Journal ,1991 , 30～ 38.[ 4 ] 　Rishel JB.Control of variable-speed pumps on hot- and chilled-watersystems[ J] .ASHRAE Transactions , 1991, 97(1).[ 5 ] 　Thielman DE.Chiller optimization by energy management controlsystems[ J] .ASHRAE Journal , 1983 , 60～ 62.[ 6 ] 　Wang SW , Burnett J , Li YF.Performance optimization of centralchi lling system in a large office building [ C] .Proceeding ofInternational Symposium on HVAC , Beijing , 1995.·????·2007??????????????????? 9???2007??????????????????? 2007? 9? 18 ～ 21?????? ,???????????????????????? ,??????? 、???????? 、???????? 、???? 、???? 、???? 、??????? 、?????? 、?????? ,??????????????????????????????????? 。????www.build.com.cn79? 2? ??? , ?:?????????????????

Adaptive optimal control of seawater cooling system in centralized air-conditioning system

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