B.18 Chillers - VN - Centrepoint

CHILLERS

The English language version prevails. u tin ting Anh khi c tranh ci.

Centrepoint Page 1 of 13 of B.18 18 September 2007

CHILLERS H THNG MY LM LNH NC CHILLER

1 GENERAL 1 TNG QUT

1.1 FUNCTIONAL DESCRIPTION 1.1 M T The chillers scope of work covers 3 water-cooled chillers located on the basement 2. Provide centrifugal type chillers suitable for variable primary flow application, with variable speed drives on the impellers for soft starting as well as varying capacity.

Phm vi cng vic chillers bao gm 3 chiller gii nhit nc t ti tng hm 2. Cung cp chiller kiu ly tm ph hp cho ng dng lu lng ban u thay i, vi b iu tc cho bnh cng tc khi ng mm cng nh thay i cng sut.

1.2 CROSS REFERENCES 1.2 THAM CHIU CHO General Comply with the General Requirements worksection.

Tng qut Ph hp vi chng Nhng yu cu chung.

Related worksections Refer to the following worksections:Mechanical Piping, Mechanical piping insulation, Air Conditioning Equipment, Mechanical Controls, Switchboards., Motor Starters

Nhng chng lin quan Tham chiu n cc chng sau: H thng ng ng c kh, Cch nhit ng ng c kh, H thng thit b x l khng kh, H thng iu khin c kh, T in, Khi ng ng c.

1.3 STANDARDS 1.3 TIU CHUN General Microbial control: To AS/NZS 3666.1 and the recommendations of SAA/SNZ HB32. Refrigeration systems: To AS/NZS 1677.2 and the recommendations of SAA HB40.1. Pressure vessels: To AS 1210. Electrical: To AS/NZS 3000.

Tng qut Kim sot vi khun: AS/NZS 3666.1 v cc yu cu trong SAA/SNZ HB32. H thng lm lnh: theo AS/NZS 1677.2 v theo khuyn co ca SAA HB40.1. Bnh p sut : theo AS 1210. Cp in: theo AS/NZS 3000.

1.4 SELECTION 1.4 LA CHN Chiller Plant Central refrigeration plant for air conditioning, shall be of the chilled water type, supplying the various air handling and fan coil units on a 16-hour/per day basis all year-round.

Chiller Thit b lm lnh trung tm nhm mc ch iu ho khng kh l loi s dng nc ti lnh, v cc AHU v FCU hot ng 16 gi mi ngy trong sut nm.

Plant sizing Equipment shall be sized based on maximum peak load and building load profile, with sufficient capacity to maintain comfort conditions during periods of recorded climatic conditions and serving all the AHUs with one unit out of service. Low load and part load considerations are required. Selection of chiller machine types and refrigerants shall be in accordance with

Tnh ton thit b Thit b c tnh ton da trn ti cao im ti a v ti lnh chi tit ta nh, cng sut duy tr trng thi khng kh thoi mi trong bt k iu kin thi tit no v phc v cho tt c cc AHU vi mt my khng hot ng. Yu cu my chy c cc ch ti thp v ti tng phn. Cc la chn chng loi my v tc nhn lnh ph hp theo cc quy nh quc t ph bin, v cc yu cu ti a

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prevailing international protocol, in addition to local code requirements. Chillers should be equipped with optimised circuits.

phng. Chiller c trang b y cc mch gas ti u ho.

Standby Capacity Matching standby capacity shall extend to circulating pumps and other auxiliaries.

Cng sut d phng Cc bm tun hon v cc ph kin khc cng phi c cng sut d phng.

Chilled Water Circuit The chilled water circuit configuration shall be with variable volume speed pumps. Chilled water flows are to vary based upon a differential water pressure sensor, down to a minimum level for each chiller (nominally 20%). The volume of the chilled water loop shall be considered in the selection of the chiller. If the chilled water loop volume is required to be increased, allow for the necessary insulated buffer tank and associated pipework, valves etc.

Vng tun hon nc ti lnh C cu vng tun hon nc ti lnh c trang b cc bm lu lng c th thay i. Lu lng nc ti lnh c thay i nh vo 1 b cm bin p sut nc khc nhau, xung ti mc thp nht cho mi chiller (thng l 20%). Th tch nc ti lnh trong vng tun hon c cn nhc khi la chn chiller. Trong trng hp c yu cu th tch nc ti lnh trong vng tun hon tng, nh thu phi thc hin cch nhit cho bnh m, ng ng, van ...

Condenser Water Circuit The condenser water circuit configuration shall be with variable volume speed pumps. Condenser water flows shall be adjusted during commissioning and fixed at the optimum level for chiller operating efficiency.

Vng tun hon nc ngng t C cu vng tun hon nc ngng t c trang b cc bm lu lng c th thay i. Lu lng nc ngng t s c iu chnh trong qu trnh nghim thu v gi c nh mc tt nht cho nng sut hot ng ca chiller.

Performance Allow for the chiller to perform as per the scheduled conditions. Offer a minimum COP as scheduled, with compressor, control, oil pump and auxiliary heaters electrical loads included. Alternatives (after a conforming offer has been made), are welcome for improved energy consumption.

Hot ng Chiller yu cu hot ng theo chng trnh qui nh. H s COP nh nht phi t yu cu, bao gm ti cho my nn, h thng iu khin, bm du v in tr si. Cc phng n khc (sau khi p ng cc yu cu a ra) c u tin cho loi tit kim nng lng.

Noise The noise rating of the chiller should be no more than 87dBA at 1 m from any direction of the chiller when operating at full load. Provide acoustic enclosures to the compressors.

n n chiller khng vt qu 87dBA cch 1m t chiller theo mi hng trong iu kin hot ng y ti. Cung cp b bao che cch m cho my nn.

Refrigerant Refrigerants used shall be supported for use for 20 years in accordance with the rules for developing countries in place at time of tender. Minimally select refrigerants to have a very low ozone depletion potential (ODP), low global warning potential and high energy efficiency.

Gas lnh Gas lnh s dng s c h tr trong 20 nm theo quy nh ca cc nc ang pht trin ti ni v thi im u thu. Ti thiu gas lnh c chn phi c lm suy yu tng ozon (ODP) cc thp, lm m tri t thp v hiu sut cao.

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2 QUALITY 2 CHT LNG

2.1 PRE-COMPLETION TESTS 2.1 TH NGHIM TRC KHI HON TT

Type tests To ARI 550/590.

Th nghim mu Theo ARI 550/590.

Pressure tests Standard: To AS/NZS 1677.2.

Th nghim p sut Tiu chun: theo AS/NZS 1677.2.

2.2 SUBMISSIONS 2.2 TRNH DUYT Submit product data for the chiller including, - Generic product data - Chiller selection data sheet for the

design conditions - Acoustic performance - Certified dimension drawings A statement from the manufacturers confirming their chiller will operate when installed as described on the drawings, or alternatively within the space available.

Trnh duyt ti liu k thut ca chiller bao gm, - Ti liu k thut chung - Thng s chn ca chiller theo iu

kin thit k - Thng s n - Bn v kch thc c xc nhn. Mt th khng nh ca nh sn xut xc nhn rng chiller ca h s hot ng khi c lp t nh m t trn bn v, hoc cch khc trong phm vi khng gian c sn.

3 MATERIALS 3 VT T

3.1 GENERAL 3.1 TNG QUAN General Provide proprietary chiller sets including components, accessories, internal power circuits, controls and motor starters.

Tng quan Cung cp chiller nguyn b mua sn bao gm cc b phn, ph tng, mch in bn trong, h thng iu khin, v b khi ng ng c.

Performance rating To ARI 550/590.

Cp cng sut Theo ARI 550/590

Structure/ enclosure Air cooled chillers: Provide weatherproof sheet metal enclosures for equipment requiring weather protection.

Cu to v my Chiller gii nhit gi: v my bng tm kim loi chu thi tit cho cc thit b t ngoi tri.

Vibration isolators Mount chiller on vibrations isolating mounts selected and provided by the manufacturer.

Cch ly rung ng Chn ca chiller t trn cc chn cch ly rung ng c la chn v cung cp bi nh sn xut.

3.2 SHELL AND TUBE LIQUID COOLERS

3.2 BNH BC HI C THN NM NGANG

General Type: Provide horizontal shell liquid coolers consisting of a shell containing a tube bundle, refrigerant circuits, water drain and vent connections, insulation, and necessary valves and fittings. Performance rating: Rate to ARI 480.

Tng quan Loi: Cung cp loi bnh bc hi c thn nm ngang bao gm bnh cha chm ng trao i nhit, cc mch gas, ng nc x v thot kh, cch nhit, cc van v ph kin cn thit. Cp cng sut: theo ARI 480

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Direct expansion type Operation: Refrigerant liquid evaporates within the tubes. Refrigerant system: Arrange refrigerant circuits to prevent oil logging at the lowest operating refrigerant velocity. Water baffles: Provide polypropylene or mild steel water baffles securely fixed to the tube bundle or welded to the shell, and incorporate pass partitions complementary to the water baffles so that the cooling effect is distributed equally between all operating tubes.

Loi gin n trc tip Vn hnh: gas lng bc hi trong ng. H thng gas lnh: cc mch gas c b tr trnh ng du trong iu kin vn tc gas vn hnh thp nht. Vch ngn nc: cung cp loi poly propylene hoc thp mm m bo gn cht vo chm ng hoc hn vo v bnh, v tch hp cc tm chn pass vo vch ngn nc phn b hiu qu trao i nhit ng u gia cc ng.

Flooded type Operation: Refrigerant liquid evaporates around the tubes. Refrigerant system: Submerge the tube bundle in liquid refrigerant and incorporate provision for complete separation of liquid droplets from leaving vapour. Do not place the tube bundle in the 20% of the refrigerant volume closest to the refrigerant outlet.

Loi ngp lng Vn hnh: gas lng bc hi xung quanh ng. H thng gas lnh: lm ngp chm ng trong gas lng v kt hp cht ch vic d phng cho s ngn cch hon ton cc git lng vi hi ra. Khng nn t chm ng trong khong 20% th tch gas lnh gn vi u ra ca gas lnh.

Construction Shells: Hot rolled low carbon steel plate to AS 1548 with seams precision electric welded and ground smooth externally. Tube bundles: Unjoined seamless copper tube to AS 1569 expanded into tube plates. Finish tubes flush with the outside edge of the tube sheet. If necessary, provide intermediate tube supports along the length of the shell, to prevent sagging of the tubes. Prevent tube from vibrating against supports. Tube plate material: Type 316 stainless steel to ASTM A240/A240M. Fixing: Fix rigidly to support structures with either - mounting feet incorporated in

cradles welded to the shell; or - fixing straps, if recessed into cradles

formed in factory-made mounting feet.

Cu to Thn: thp tm cn nng hm lng cacbon thp theo AS 1548 s dng mi hn in chnh xc v b mt ngoi mi nhn. Chm ng: ng ng khng c mi hn ni loi tho c theo AS 1569 m vo tm gi ng. ng lp phng mt vi cnh ngoi ca tm gi ng. Nu cn thit, cung cp ng trung gian dc chiu di thn trnh s vng ng. Trnh lm rung ng t cc gi . Vt liu tm gi ng: Thp khng r loi 316 theo ASTM A240/A240M. Lp: lp cht theo cc kt cu bng: - Chn treo lin kt thnh khung hn

vo thn bnh: hoc - Lp thanh ging, gn m vo

khung to bi chn lm ti nh my.

Water boxes General: Provide removable water boxes for flooded type coolers. Marine water boxes: Provide marine water boxes with removable cover plates that permit access to tubes without disturbing the attached water piping.

Hp nc Tng qut: cung cp cc hp nc c th dch chuyn cho bnh bc hi loi ngp lng. Hp nc marine: cung cp cc hp nc marine vi tm che ph c th dch chuyn cho php tip cn cc ng gas m khng lm nh hng ng nc gn vo.

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Accessories Refrigerant connections: Seal after pressurising the refrigerant side with dry nitrogen. Water connections: Flanges to AS 2129 Table E. Provide covers or caps. Freeze-up protection: Provide threaded connections with removable plugs for the insertion of a separate well to hold the sensing bulb of a freeze-up protection safety cut-out. Thermometer pockets: Provide at water inlet and outlet. Water side pressure drop test sockets: Provide at inlet and outlet. Factory test and provide metal tag stating water cooler pressure drop at design water flow.

Ph kin u ni ng gas: hn kn sau khi bm p lc bn trong bng nit kh. u ni ng nc: dng mt bch theo AS 2129 bng E. Cung cp chp v bao gi. Bo v chng ngng t: cung cp u ni ren c nt bt tho lp c gn cc u cm ng bo v chng ngng t. Ti lp nhit k: lp ti cc u ng nc ra v ng nc vo. Cc l th nghim st p pha c nc: lp ti cc u ra v u vo. Th nghim ti nh my v cung cp nhn kim loi ghi st p bnh lm lnh lu lng thit k.

3.3 LIQUID COOLER INSULATION

3.3 CCH NHIT BNH LM LNH

General Select from the following as specified in the Mechanical piping worksection. - Elastomeric foam. Minimum R value: To the Minimum R value table in the Mechanical piping insulation worksection.

Tng quan Chn t cc loi sau nh qui nh trong chng H thng ng ng c kh. - Vt liu: Bt xp n hi Gi tr R nh nht: Xem Bng Gi Tr R Nh Nht trong chng H thng ng ng c kh.

3.4 SHELL AND TUBE CONDENSERS

3.4 BNH NGNG NG NC NM NGANG

General Type: Provide horizontal water cooled, mechanically cleanable refrigerant condensers with water flowing through the tubes, consisting of a shell containing a tube bundle, refrigerant and cooling water circuits and necessary valves and fittings. Performance rating: Rate to ARI 450.

Tng qut Loi: cung cp bnh ngng nm ngang lm sch gas lnh bng c kh, gii nhit nc vi nc chy qua ng, bao gm 1 v cha chm ng, gas lnh v vng tun hon nc ti lnh v cc van cn thit v my mc. Cp cng sut: theo ARI 450

Construction Shells: Hot rolled low carbon steel plate to AS 1548 with seams precision electric welded and ground smooth externally. Tube bundles: Integral finned or enhanced seamless copper tubes to AS 1569 expanded into tube plates. If necessary, provide intermediate tube supports along the length of the shell, to prevent sagging of the tubes. Prevent tubes from vibrating against supports. Tube plate material: Type 316 stainless steel to ASTM A240/A240M. Refrigerant storage: Size to take full refrigerant charge on pump down. Fixing: Fix rigidly to suitable supports.

Cu to Thn: thp tm cn nng hm lng cacbon thp theo AS 1548 vi mi hn in chnh xc v b mt ngoi nhn. Chm ng: ng ng c hoc c vy ton b theo AS 1569 n ra trong cc tm ng. Nu cn thit, cung cp cc ng trung gian dc theo chiu di v, trnh ng b vng. Ngn nga ng khi s rung ng t cc gi . Vt liu tm gi ng: thp khng r loi 316 theo ASTM A240/A240M. S tch tr gas lnh: sp xp np gas lnh y khi bm ngng. S c nh: lp chc vi cc gi ph hp.

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Water boxes General: Provide removable water boxes. Marine water boxes: Provide marine water boxes with removable cover plates that permit access to tubes without disturbing the attached water piping.

Hp nc Tng qut: cung cp hp nc c th dch chuyn. Hp nc marine: cung cp cc hp nc marine vi tm che ph c th dch chuyn cho php tip cn cc ng gas m khng lm nh hng ng nc gn vo.

Accessories Refrigerant connections: Seal refrigerant hot gas inlet and liquid outlet connections. Pressurise with dry nitrogen. Water connections: Water flow and return connections, flanged to AS 2129 Table E. Fit blank companion flanges, bolts and gaskets. Alternatively, sizes DN 50 may be screwed, with removable plugs or caps. Drain connections: Minimum DN 20 screwed connection with valved connection points at the lowest point of both water boxes. Vent connections: Minimum DN 15 screwed connection with valve. Thermometer pockets: Provide at water inlet and outlet. Cathodic protection: Provide sockets for cathodic protection probes. Locate where recommended by the cathodic treatment specialist. Water side pressure drop test sockets: Provide at inlet and outlet. Factory test and stamp condenser shell, or provide metal tag, stating pressure drop at design water flow.

Ph kin u ni ng gas: lm kn ng gas vi u ni kh nng ng vo v cht lng ng ra. To p vi kh Nit kh. u ni ng nc: cc u ni lu lng nc v ng hi c mp theo AS 2129 bng E. Lp ch trng vi cc mt bch, bulng v ming m. Nh mt s la chn, kch thc DN 50 phi vn vt, vi cc np v cht c th dch chuyn. u ni ng x: u ni vn vt nh nht DN 20 vi nhng im kt ni c van ti im thp nht ca c hai bn hp nc. u ni ng thng hi: u ni vn vt nh nhT DN 15 vi van. L gn nhit k: cung cp ti u vo v ra ca nc. Bo v cc m: cung cp cc l cho thit b bo v cc m. t ti ni c ngh bi chuyn gia x l cc m. L kim tra s gim p sut nc: cung cp ti u vo v ra. Th nghim ti nh my v ng du ln thn bnh ngng, hoc cung cp nhn kim loi, s gim p sut tnh theo lu lng nc thit k.

3.5 REFRIGERATION SYSTEM 3.5 H THNG GAS LNH General Design refrigeration systems for minimum refrigerant leakage potential.

Tng quan Thit k h thng gas lnh nhm gim thiu kh nng r r gas.

Standards To AS/NZS 1677.2 and SAA HB40.1.

Tiu chun Theo AS/NZS 1677.2 v SAA HB40.1.

Accessories General: Provide necessary refrigerant circuit accessories, including the following: - Discharge muffler (internal or external

type). - Liquid line filter drier. - Isolation valve both sides of the filter

drier. - Liquid line solenoid valves. - Liquid line sight glass moisture

indicator. - Refrigerant charging valve. - Suction, discharge and oil pressure

indication, either gauges or digital

Ph kin Tng quan: cung cp cc ph kin cn thit phc v mch gas, bao gm: - u x gim m (loi t bn trong

hoc bn ngoi) - Lc kh ng lng - Van cch ly c hai pha lc kh - Van solenoid ng lng. - Knh xem mc gas lng - Van np gas. - Hin th p sut u ht, u y, v

du, bng ng h hoc hin th s

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readout from transducers via the microprocessor based control module, as appropriate.

- Expansion device. Chillers with multiple compressors: Provide at least 2 independent refrigeration circuits.

chuyn i t b chuyn i tn hiu thng qua modun iu khin s dng vi x l, cho thch hp.

- Thit b tit lu. Chiller vi nhiu my nn: cung cp t nht hai mch gas c lp.

3.6 CONTROL SYSTEM 3.6 H THNG IU KHIN Type Menu driven, microprocessor based module. Tropicalised control box. With data collection module for fault finding for each chiller. Data collection should be possible by service technicians local laptop computers, for emailing data to manufacturers factory for fault diagnosis. With RS 485 access capability.

Loi Hot ng theo menu, da vo cc modun vi x l. Hp iu khin nhit i ha. B thu d liu cc d tm li trn mi chiller. Cc d liu thu c trn my laptop ti ch ca nhn vin k thut, v gi email cho nh my sn xut chn on li. Kh nng truy cp: theo cng RS485

3.7 INDICATION 3.7 HIN TH Centrifugal and screw chillers General: Provide indication of the following: - System on. - Fault requiring manual reset. - Entering and leaving liquid cooler

water temperature. - Chilled water set point. - Voltage on each phase, for solid state

starters. - Drawn current on each phase, for solid

state starters. - Electrical current limit set point, for

solid state starters. - Chiller diagnostics. - Remote chilled water set point signals. - Hours run. - Start counter. Accessories: Provide a general fault relay.

Chiler ly tm v trc vt Tng quan: Cung cp cc hin th sau - H thng ang hot ng - Li yu cu khi ng li bng tay - Nhit nc ti lnh vo v ra. - im ci t cho nc ti lnh. - in p mi pha cho b khi ng

kiu bn dn. - Dng y ti cho mi pha cho b

khi ng kiu bn dn. - Cng dng ci t cho b khi ng kiu bn dn.

- B chn on chiller. - Cc tn hiu ci t nc ti lnh t

xa. - S gi hot ng. - B m s ln khi ng. Ph kin: cung cp r-le bo li chung.

3.8 SAFETY CONTROLS 3.8 IU KHIN AN TON General Provide electrical interlocks to protect against the following: - Chilled water low flow. - Condenser fan motor overload, for air

cooled units. - Compressor motor overload. - Oil pressure failure on refrigeration

compressors. - High and low pressure for

compressors. - Short cycling of compressors.

Tng quan Cung cp kha lin ng bo v trong cc trng hp sau: - Lu lng nc ti lnh thp - Qu ti ng c qut dn ngng cho

chiller gii nhit gi. - Qu ti mt my nn. - Mt p du trong my nn. - Cao p v thp p trong my nn. - Ngn mch my nn. - Nhit nc ti lnh thp

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- Low chilled water temperature. Centrifugal chillers Provide electrical interlocks to protect against the following: - Motor high temperature. - Contactor weld-in. - High bearing temperature. - Phase failure under voltage, single

phase and phase rotation protection. - High oil temperature. - Surge protection by monitoring of

compressor motor current. - Pre-lube before compressor start and

post-lube during compressor spin down.

Chiller ly tm Cung cp kha lin ng bo v trong cc trng hp sau: - Nhit ng c cao - Contactor khng nh - Nhit trc cao - Mt pha do in p thp, 1 pha v

o pha. - Nhit du cao. - Bo v qu dng bng cch hin

th dng ng c my nn. - Bm du bi trn trc khi my

nn khi ng v thc hin bi trn sau trong khi my nn gim tc .

Screw chillers Provide electrical interlocks to protect against the following: - Motor high temperature. - Contactor weld-in. - Phase failure under voltage, single

phase and phase rotation protection. - High oil or bearing temperature. - Pre-lube before compressor start and

post-lube during compressor spin down.

- High refrigerant discharge temperature.

Chiller trc vt Cung cp kha lin ng bo v trong cc trng hp sau: - Nhit ng c cao. - Contactor khng nh. - Mt pha do in p thp, 1 pha v

o pha. - Nhit du v trc cao. - Bm du bi trn trc khi my

nn khi ng v thc hin bi trn sau trong khi my nn gim tc .

- Nhit gas u y cao.

3.9 MULTIPLE CHILLER CONTROL

3.9 IU KHIN NHIU CHILLER

Multiple Chiller Control Where multiple chillers operate as a system, provide a chiller system manager to operate the chillers as a single central cooling plant. The chiller system manager shall be provided and commissioned by the chiller manufacturer. Operation of the chillers shall be such that energy costs are minimised. The chiller system manager shall interface with the building management system using a serial interface, which shall be used to initiate the chiller system on request and to allow remote monitoring as below. Operating control and monitoring of auxiliary equipment such as chilled water pumps, condenser water pumps, purge units may be via the chiller system manager or directly by the building management system.

iu khin nhiu chiller Ti ni nhiu chiller hot ng nh mt h thng, cung cp mt b qun l h thng chiller vn hnh cc chiller nh mt vng lm lnh trung tm c lp. B qun l h thng chiller phi c cung cp v nghim thu bi nh sn xut chiller. S vn hnh ca cc chiller phi chi ph in nng gim n mc ti thiu. B qun l h thng chiller phi giao tip vi BMS ang dng mt giao tip theo th t, c dng khi ng h thng chiller theo yu cu v cho php theo di t xa nh phn di. iu khin s vn hnh v hin th cc thit b ph tr nh cc bm nc lnh, bm nc ngng, thit b lm sch qua b qun l h thng chiller hoc trc tip bi BMS.

3.10 REMOTE MONITORING 3.10 THEO DI T XA General Tng quan

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Common alarm: Provide for a common alarm signal to be connected into a remote monitoring system. BMS interface: Provide an interface to enable a building management system to interrogate the control panel, or reset the chiller set points. BMS interface protocol: accessible by the Building Management System supplier. Minimally allow transfer of the following data. - CHW temperatures - Refrigerant temperatures - Refrigerant pressures - Oil pressure - Current - % load - Chiller diagnostics - Hours run - Start counter - Alarm status - Alarm history - Other recommended parameters for

remote servicing.

Tn hiu bo ng chung: cung cp tn hiu bo ng chung c kt ni vo h thng theo di t xa. Giao tip BMS: cung cp mt cng giao tip cho php kt ni BMS vi t iu khin hoc ci t li cc gi tr im ci t ca chiller. Giao thc giao tip BMS: c th truy cp bi nh cung cp BMS. Ti thiu c th truyn i cc tn hiu sau: - Nhit nc ti lnh - Nhit gas. - p sut gas. - p sut du. - Cng dng. - % ti - Chn on chiller - S gi hot ng - S ln khi ng. - Tnh trng bo ng. - Cc tnh trng bo ng xy ra. - Cc thng s khc c khuyn co

phc v vic theo di t xa.

3.11 CAPACITY CONTROL 3.11 IU KHIN CNG SUT Centrifugal and screw chillers Operation: Provide for chillers to start unloaded and for subsequent loading and unloading to be by the control system. Control system: Provide a control system which senses the leaving chilled water temperature and maintains it at the desired setting by modulation of the compressor slide valve, unloading ports or variable speed drive, as appropriate. Current limiter: Provide control to limit the maximum current drawn by the compressor motor by monitoring the 3 phases of supply power. Demand limiter: Provide control to permit continuous manual control of power demand at operating points from 20 - 100% of full load power.

Chiller ly tm v trc vt Vn hnh: cung cp chiller khi ng khng ti v tun t tng ti v gim ti bng b iu khin. H thng iu khin: cung cp h thng iu khin cm bin nhit nc ti lnh ra v duy tr nhit ti im ci t bng s iu chnh ca van trt ca my nn, cc cng gim ti hoc cnh chnh u vo cho thch hp. B hn ch dng in: cung cp iu khin hn ch dng cc i ca my nn bi vic theo di pha ca ngun cp. B hn ch nhu cu: h thng iu khin cho php iu khin nhu cu cng sut bng tay lin tc ti thi im my ang hot ng 20 100% ti.

3.12 CENTRIFUGAL COMPRESSORS

3.12 MY NN LY TM

Construction Casing: Close-grain cast iron arranged to allow access to the rotor assembly inlet guide vanes and wearing parts. Rotor: Heat treated alloy steel or high strength cast aluminium impeller statically and dynamically balanced for vibration free operation. Over-speed test the rotor assemblies.

Cu to V: gang c mn ht c sp xp cho php tip cn cc cnh dn hng u vo rto v cc b phn. Rto: bnh cng tc bng thp hp kim c x l nhit hoc nhm c sc bn cao c cn bng tnh v ng vn hnh khng c rung ng. Kim tra qu tc cc b phn ca rto.

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Bearings: Provide accessible precision bored main bearings of the insert journal type and separate thrust bearings to axially position the impeller and absorb any unbalanced thrust. Pre-rotation vanes: Provide stepless capacity control, which maintains stable operating conditions and responds to variations in load from leaving chilled water setpoint temperature. Drive type: Select from the following: - Direct drive. - High speed helical gear train. Open drive compressor shaft seals: Provide oil lubricated mechanical shaft seals which are efficient under both vacuum and pressure conditions. Lubrication: Provide oil separator, pump, filter, oil cooler, thermostatically controlled oil heater and pressurised lubrication during run-up and coast-down including coast-down after a power failure. Oil heaters: To operate during off cycles of the compressor.

trc: cung cp cc trc chnh c chn chnh xc c th s dng ca loi ngng trc lng vo v cc trc sc p ring bit ti v tr quanh trc ca bnh cng tc v hp thu cc sc p khng cn bng. Cc cnh trc khi quay: cung cp iu khin cng sut lin tc, duy tr trng thi hot ng n nh v p ng cc ti khc nhau theo nhit nc ti lnh i ra c ci t. Loi khi ng: chn t cc loi sau: - Khi ng trc tip - B truyn ng bnh rng xon c

tc cao. Cung cp du bi trn nhng ch lm kn thn my c kh nng lm vic trong iu kin c p ln chn khng. Bi trn: cung cp b tch du, bm du, lc du, b gii nhit du, b hm du iu khin nhit v bi trn p sut trong qu trnh chy v ngng my k c ngng my do mt in. B hm du: hot ng trong sut chu trnh ngh ca my nn.

3.13 SCREW COMPRESSORS 3.13 MY NN TRC VT Construction Casing: Close-grain cast iron. Rotors: Carbon steel individual rotors with male rotor directly driven or connected to the motor by a flexible coupling. Capacity control: Positive hydraulic capacity control assembly including machined cast iron single slide valve, a piston and interconnecting spindle or fixed port unloading with solenoid valves. Lubrication: Provide oil separator, pump or pressure differential oil system, filter and oil cooler. Crankcase heaters: To operate during off cycles of the compressor.

Cu to V: gang c mn ht R-to: cc r-to ring l bng thp cacbon c trc c truyn ng trc tip hoc ni vi ng c bng khp ni mm. iu khin cng sut: iu khin cng sut bng thy lc bao gm mt van trt c kh bng gang, mt piston v trc ni lin kt hoc hoc gn cng gim ti bng van solenoid. Bi trn: cung cp b tch du, bm du hoc h thng chnh p du, lc du v b gii nhit du. Hp hm du: hot ng khi my nn khng lm vic.

3.14 PURGE UNITS AND PRESSURE SYSTEMS

3.14 B LM SCH V H THNG P SUT

Centrifugal chiller purge units General: For chillers which, at any time, are below atmospheric pressure, prevent loss of refrigerant during purging cycle. - Deemed-to-satisfy: Purge units with

an operating efficiency of 99%. Operation: Provide automatic controls which allow unattended operation. Alarm: Provide purge units which automatically alarm if excessive purging

B lm sch cho chiller ly tm Tng qut: cho chiller, vo bt c lc no di p sut kh quyn, trnh tn tht gas lnh trong qu trnh lm sch. - Tha yu cu: b lm sch vi hiu

sut hot ng 99%. Hot ng: cung cp s iu khin t ng khng cn ngi gim st. Bo ng: cung cp b lm sch c bo ng t ng khi s lm sch qu mc

CHILLERS



is detected within a continually updated given time period.

c pht hin trong khong thi gian cp nht lin tc.

Centrifugal chiller pressure systems Emission abatement: For chillers which, at any time, are below atmospheric pressure, provide a means of - preventing air infiltration and

refrigerant loss; - preventing the subsequent need for

purging to the atmosphere; and - pressurising the chiller for leak-

testing purposes. - Deemed-to-satisfy: Refrigerant

emission abatement systems, permanently attached to chillers, and which automatically maintain positive pressure within the chiller vessel during non-operational periods, by referencing atmospheric pressure.

Components: Provide the following: - Aluminium-plated, silicon heat

blankets or hot water heater. - Solid state safety circuit/automation

interface. - Refrigerant pressure controller. - Leak test mode set points. - For blanket type systems:

. Temperature limiting module capable of ensuring that the heat supply cannot exceed a predetermined high limit temperature by sensing heat blanket temperature.

. Proportional control over heat blankets to maintain setpoint.

H thng p sut chiller ly tm S lm gim mi: cho chiller, vo bt c lc no di p sut kh quyn, cung cp bin php - trnh khng kh thm nhp v tn

tht lnh - trnh nhu cu theo sau cho s lm

sch khng kh; v - to p chiller cho mc ch th x. - Tha yu cu: h thng lm gim

s bc mi ca gas lnh c lp c nh vi chiller, v duy tr t ng p sut dng trong bnh cha ca chiller trong qu trnh khng hot ng, ph hp vi p sut kh quyn lin quan.

Thnh phn: cung cp nh sau: - Lp ph chu nhit bng silicon m

nhm hoc b hm nc nng. - Giao tip t ng / mch an ton

bn dn. - B iu khin p sut gas lnh. - Cc im th x - Cho cc h thng lp ph:

. B phn hn ch nhit c kh nng m bo nhit cung cp khng vt qu mt nhit cao nh trc bng cch cm nhn nhit lp ph chu nhit.

. Kim sot s cn xng ca lp ph chu nhit duy tr im ci t.

3.15 REFRIGERANT CONTAINMENT

3.15 D TR GAS LNH

Provide a mobile refrigerant containment system, suitable and of a capacity for storing the refrigerant from one chiller.

Cung cp h thng d tr gas lnh di ng, ph hp v c kh nng cha mt lng gas cho mt chiller.

3.16 ACOUSTIC INSULATION 3.16 CCH M Provide discharge line sound reduction kit. Provide acoustic sound insulation kit.

Cung cp b ph kin gim m ti ng y. Cung cp b ph kin cch m.

3.17 UNIT MOUNTED STARTER 3.17 B KHI NG C KHUNG General Provide a unit mounted started integrated with the chiller microprocessor based control system. Centrifugal Chillers The starter is to be a variable speed type

Tng qut Cung cp mt b khi ng c khung giao tip vi mch x l chiller da trn h thng iu khin. Chiller ly tm B khi ng l loi tc thay i vi

CHILLERS



with appropriate electronic solid state drive as per Motor Starters. Control Interface The following protection shall be included and monitored. - Motor overload trip - Phase loss/ reversal/ unbalance - Under voltage/ over voltage - Line side voltage - Line side current - Line side power factor - Frequency - Kilowatts - Kilowatt hours

s truyn ng in bn dn thch ng nh B khi ng ng c. Giao din iu khin Bao gm v hin th nhng s bo v nh sau: - Ngt qu ti ng c - Mt pha/ o pha / khng cn bng - Di p/ trn p - in p pha ngun cp - Dng in pha ngun cp - H s cng sut pha ngun cp - Tn s - KW - KWH

3.18 MARKING 3.18 GHI NHN Labels Show the following: - Manufacturers name. - Model number. - Serial number. - Refrigerant type. - Refrigerant charge. - Water side pressure drop and design

water flow rates.

Nhn my Th hin bao gm: - Tn nh sn xut - S model my - S seri my - Loi gas s dng - Lng gas np. - Mt p v pha nc v lu lng

nc thit k.

Rating plates Required.

Nhn cng sut my Phi c.

4 EXECUTION 4 THI CNG

4.1 GENERAL 4.1 TNG QUAN Manufacturer's instructions Install in accordance with instructions supplied by chiller manufacturer. Include completed manufacturer's checklists in commissioning data.

Hng dn ca nh sn xut Lp t theo hng dn ca nh sn xut chiller. Bao gm mt danh sch cc im kim tra hon chnh c trong h s chy th v nghim thu.

5 COMPLETION 5 HON TT

5.1 COMMISSIONING 5.1 CHY TH V NGHIM THU Operational check Check operation of the chiller system including auxiliary equipment and control systems. After starting up, adjust and calibrate the chiller system.

Kim tra vn hnh Kim tra hot ng h thng chiller bao gm c cc thit b ph v h thng iu khin. Sau khi khi ng my, iu chnh v hiu chun h thng chiller.

Performance tests Controls tests: For factory assembled chillers, demonstrate that chiller controls meet performance requirements. Verify the marked set points of instruments, gauges and switches, by measurement of the controlled medium. Record and rectify deviations.

Th nghim c tnh Th nghim iu khin: i vi cc chiller c lp rp ti nh my, chng minh h thng iu khin chiller p ng cc yu cu khi hot ng. Xc minh cc thng s ci t trn dng c, ng h, v cng tc bng cch o li cc thit b c iu khin. Ghi nhn

CHILLERS



Safety alarm circuits tests: Simulate each unsafe condition alarm.

v iu chnh li cho ng cc sai s. Th nghim bo ng an ton mch gas: m phng ti mi trng thi bo ng khng an ton.

Commissioning Commission the chiller system under the supervision of the equipment manufacturers authorised field technicians.

Chy th v nghim thu Kim tra v chy th h thng chiller di s gim st ca chuyn vin k thut ca nh sn xut.

5.2 MAINTENANCE 5.2 BO TR Hermetic and semi-hermetic compressors Analyse refrigerant gas at 3 monthly intervals during the maintenance period. Determine the acid and moisture content of the gas. Submit analyses.

My nn kn v na kn Phn tch gas mi 3 thng trong sut thi gian bo tr. Xc nh hm lng axit v hi m cha trong gas. trnh bng phn tch.

Manufacturers Comprehensive Maintenance Include manufacturers comprehensive maintenance for duration of defect liability period (12 months from practical completion).

Bo tr ton din ca nh sn xut Bao gm vic bo tr ton din ca nh sn xut trong thi gian chu trch nhim cc khuyt tt (12 thng k t ngy hon tt thc t).

Maintenance Proposal Offer proposals at tender for annual maintenance contracts, preventative and comprehensive, annually renewable for 5 years.

ngh bo tr a ra cc ngh trong h s thu v cc hp ng bo tr hng nm, d phng v ton din, gia hn hng nm trong vng 5 nm.

Documents

B.18 Chillers - VN - Centrepoint