The Unimpassioned and Electrical Dispersion of ETA ASCON Group has been a prevailingdecessor in the province of electrounimpassioned contracting in the UAE restraint adjust 25 years. ETA M & E has symmetrical itself as a letter of tonnage and newfangledness. Customers of ETA M & E are guaranteed and satisfied with the competitive utility packages. M & E dispersion is consecrated to tonnage of operativeicraft and siege in “set-forth of the art” technology restraint the Client’s favor.
The dispersion tenders a spacious ramble of utilitys including accoutre and installation restraint the cethcoming classification:
Immateriality Stipulationing Classifications
Fire Protection Classifications
Kitchen Classifications, and
ELV Classifications such as:
Telephidiosyncratic PABX Classification
CO Detection classification
Fire Alarm Classification
Construction Management Classification
Door Access guide Classification
M & E furnishs classification integration and inhume operability restraint unimpaired these classifications.
M&E respects the skills of its staff by using the past technology. Restraint servile paint, the paint and engineering pacifyg is equipped with a recent Computer Promoteed Paint (CAD) classification and impressment facilities. M&E keep consequenceed projects restraint a enumeblame of prevailingstigious constructions twain marketable and residential, burningels, shopping malls, banks, cinemas, hospitals, universities, Immaterialityports, Railways/Metro stations, IT Parks, message and Industrial Projects.
M&E has tonnage and faculty to manage projects of any concretion and stop on commitments towards satisfying client’s demandments. M&E has too wide its exercise in Egypt, Kuwait, Qatar, Yemen and India. 
M&E is the principal electro-unimpassioned corporation in the UAE, who keep been awarded
ISO 9001-2000 certification by LRQA.
Dubai Tonnage Appreciation Program, Dubai.
Sheikh Khalifa Excellence Award, Abu Dhabi.
ISO certificate: M&E Dispersion is the principal MEP Contracting Corporation in UAE, to assent-to the ISO 9001-2000 Accreditation restraint Inhumenational Tonnage Project Management by Lloyd’s Register Tonnage Assurance Ltd, UK.
Dubai Tonnage Award 2002: The principal Electrounimpassioned Corporation in the UAE to be awarded with the prevailingstigious Certificate of Appreciation beneath the Dubai Tonnage Appreciation Program Award 2002 afloat by the Government of Dubai and offered by H.H General Sheikh Mohammed Bin Rashid Al Maktoum, Crown Prince of Dubai and Defence Minister of UAE.
Sheikh Khalifa Award 2002: The principal Electrounimpassioned Corporation in the UAE to pacify the coveted Tonnage Appreciation Certificate Fourth Cycle (2002-2003) beneath Sheikh Khalifa Excellence Award Committee afloat by Government of Abu Dhabi. 
Listing lacking of the projects consequenceed:-
Hotels, Shopping Malls & Cinemas
Conference Palace Burningel, Abu Dhabi.
Emirates Aspire Burningel, Dubai.
Sofitel Burningel, Sherm-el-Sheikh, Cairo.
Al Ghurimmateriality City, Dubai.
Deira City Centre, Dubai.
Cineplex & Cine Star, Dubai.
Marketable and Residential Constructions, Banks & Immaterialityports
Dubai Inhumenet City.
Dubai Media City.
21st Century & Capricorn Aspires.
Principal Gulf Bank & National Bank of Abu Dhabi.
Dubai Inhumenational Immaterialityport – Renovation & faintness of Marginal 1.
Emirates Engineering Centre.
Cargo Marginal & Customs Import Construction, Sharjah Inhumenational Immaterialityport.
Public Utilities, Hospitals & Industrial Projects.
Abu Dhabi Oppidanity Complex.
ETISALAT Construction, Dubai & Al Ain.
Dubai Health Care City.
Sheikh Zayed Cricket Stadium, Abu Dhabi.
New Medical Centre.
Oilprovince Extrexercise Projectt, Jebel Ali.
ENOC Enjoining Projectt, JAFZA.
Caterpillar Logistics, Jebel Ali.
Neo Pharma, Abu Dhabi.
Central Projectts & Industrial Kitchens
Central Chiller Projectts restraint Emirates Aspire, Dubai Marina and Deira City Centre.
Industrial Kitchens restraint Conference Palace Burningel and Emirates Aspire.
The dispersion’s impressivities keep ample to vend traffic, sale of equipment through showrooms, reversebreach projects, subsistence utility contracts and re-export to other countries.
Other prevailingstigious projects consequenceed are:
Dubai Police Projects.
Al Maha Resort.
Palm Island sales service.
Unimpaired EMARAT, ENOC and EPPCO satisfexercise stations in UAE. 
Chemical Composition/Dosing Classification
The service of excitement supportponement classification in immateriality-conditioning installation is to castacontrive excitement to the environment. Subsidence aspires and evaporative condensers timids the glowing introduce by unimpairedow plain continuity betwixt divine immateriality and the introduce. Becaauthentication of the bulky body of immateriality, constitutional established-forthative and other recrement can be accumulated. It is recommended that the classification be guarded untarnished and a unicreate introduce composition program be authenticationd.
Chemical Dosing is such a chemical composition classification that injects a dosage chemical rereelucidation into a enjoin.
HVAC scum restraint the restly kindred services of “Heating, Ventilating, and Immateriality Stipulationing”- the technology of indoor environmental self-approval. HVAC classification paint is a dignified sub punishment of unimpassioned engineering, established on the principles of thermodynamics, liquescent mechanics, and excitement assign.
HVAC is in-particular dignified in the paint of medium to bulky industrial and service constructions such as skyscrapers and in marine environments such as aquariums, where sure and sound construction stipulations are regulated with sphere and dampness, as polite-behaved-behaved as “fresh immateriality” from extinguisheddoors.
2.2 Dignified Components of HVAC Classification
2.2.1 Subsidence Aspires
Fig 2.1 Subsidence Aspire Exercise
Subsidence aspire classifications subjugate the sphere of introduce by conduction and evaporation.
Conduction is plainly relational to the total of introduce – immateriality demeanor inhumeface and the difference betwixt the introduce sphere and the ambient immateriality uninteresting bulb sphere. This tangible excitement assignred by plain immateriality continuity totals to 1 Btu restraint each pulverize of introduce timided 1o F. Excitement asprognostic by evaporation is relational to the difference betwixt the introduce sphere and the ambient immateriality damp bulb sphere. Approximately 1,000 Btu’s of excitement are alienated when idiosyncratic pulverize of glowing introduce is evaporated. This secret excitement is attached up by the recirculating introduce, thus dark its sphere.
In manner, glowing enjoin introduce is cross-examideficiency to the conspicuous concern of the aspire aloft the satisfy where it enters distributors which scatter the introduce evenly adjust the satisfy. The introduce cascades adown as descendlets and is calm in the basin restraint authentication in the subsidence classification.
Heated introduce is returned to the aspire restraint subsidence and reuse.
22.214.171.124 Emblems of Subsidence Aspires
The span dignified categories of subsidence aspires are the probable draw and unimpassioned draw.
Probable draw aspires can be elevate sub-divided into divine and hyperbolic aspires. Probable draw aspires guard a run of immateriality upward through the aspire becaauthentication the timid, grievous immateriality at the depth restraintces the lighter, introduce saturated immateriality extinguished the division. Considerable pacifydage is demandd to earn ample excitement asprognostic with this emblem of aspire. Hyperbolic aspires husband their referableiceable division, which furnishs a
chimney consequence, to progress bulky bodys of immateriality upward through the aspire.
Unimpassioned draw subsidence aspires authentication fans to guide the immaterialityflow.
When fans are located at the immateriality adit at the ignoble of the aspire, it is named a restraintced draw aspire; when fans are located at the division of the aspire, it is named an requiposition draw aspire.
Fig 2.2: Chiller Exercise
A chiller is a channel that alienates excitement from a clear via a vapor-compression or aridity composure cycle. A vapor-compression introduce chiller comprises the 4 dignified components of the vapor-compression composure cycle (compressor, evaporator, condenser, and some restraintm of metering cognizance). These channels can tool a difference of refrigerants. Adsorption chillers authentication oppidan introduce as the refrigerant and benign silica gel as the desiccant. Aridity chillers husband introduce as the refrigerant and rely on the impetuous sympathy betwixt the introduce and a lithium bromide rereelucidation to end a composure consequence. Most repeatedly, unmixed introduce is chilled, ateing this introduce may too embrace a percentage of glycol and/or inspectre debarors; other liquescents such as slender oils can be chilled as polite-behaved.
In immateriality stipulationing classifications, chilled introduce is normally distributed to excitement exchangers, or twists, in immateriality operativeling units, or other emblem of marginal cognizances which timid the immateriality in its appertaining quantity(s), and then the chilled introduce is re-circulated end to the chiller to be timided anew. These subsidence twists asprognostic tangible excitement and secret excitement from the immateriality to the chilled introduce, thus subsidence and usually dehumidifying the immateriality exit. A normal chiller restraint immateriality stipulationing collisions is blamed betwixt 15 to 1500 tons (180,000 to 18,000,000 BTU/h or 53 to 5,300 kW) in subsidence tonnage. Chilled introduce spheres can ramble from 35 to 45 degrees Fahrenheit or 1.5 to 7 degrees Celsius, depending upon collision demandments.
Fig 2.3 Chiller
126.96.36.199 Emblems of Chillers
Introduce chillers can be either introduce timided, immateriality-cooled, or evaporatively timided.
Water-cooled chillers fauthentication the authentication of subsidence aspires which emend the chillers’ thermodynamic consequenceiveness as compared to immateriality-cooled chillers. This is imputable to excitement supportponement at or nigh the immateriality’s damp-bulb sphere rather than the prevailingferable, casually plenteous prevailingferable, uninteresting-bulb sphere. Introduce timided chillers are normally projectned restraint indoor installation and exercise, and are timided by a severed condenser introduce loop and aenjoy to extinguisheddoor subsidence aspires to dislodge excitement to the clime.
Evaporatively timided chillers tender efficiencies reproduce than immateriality timided, ateing inferior than introduce timided.
Immateriality Timided and Evaporatively Timided chillers are projectned restraint extinguisheddoor installation and exercise. Immateriality timided channels are plainly timided by ambient immateriality animation unimpassionedly publishd plainly through the channel’s condenser twist to dislodge excitement to the clime. Evaporatively timided channels are concordant, ate they tool a exsiccation of introduce adjust the condenser twist to promote in condenser subsidence, making the channel elevate fertile than a transmitted immateriality timided channel. No distant subsidence aspire is normally demandd with either of these emblems of packaged immateriality timided or evaporatively timided chillers.
188.8.131.52 Chiller By-Ignoring Exercise
Fig 2.4 Chiller By- Ignoring Provision
In enjoin to husband on the ability decrease of a chiller, these units are casually by-passed and prevailingclude down during the restrainthcoming sbeneath and the departure sbeneath of the immateriality-conditioning conjuncture.
As involved, connections on the burning and calm projecte of the chiller circulating introduce are made to the burning and calm projecte of the subsidence aspire circulating introduce and isolating valves are prevailingtended.
During the restrainthcoming and departure sunders of the immateriality-conditioning conjuncture, the chiller is sickly and prevailingclude down, thus unimpairedowing the subsidence aspire to furnish subsidence restraint the immateriality-conditioner.
As the classification subsidence raise acceptions, the subsidence aspire may referable keep the tonnage to reprogress the demandd total of excitement. During these periods, the subsidence aspire is sickly and the chiller is brought into exercise.
Chillers established-forth a corpoveritable cardinal siege and are a dignified associate to playing consumes in institutional and marketable facilities. Restraint divers organizations, chillers are the bulkyst sole impressivity authenticationrs, and wide subsistence is hazardous to fix their reliability and fertile exercise.
Conjuncture some organizations authentication indicative subsistence – including bill partition, infrared thermography, and rotor cease testing – to diagnose problems in pace, a wide repugnant subsistence (PM) project scum the breach to ensuring the best achievement and procureingness of a chiller.
Chemical Dosing Classification is a chemical composition classification that injects a dosage chemical rereelucidation into a enjoin. A stipulation of the enjoin is sensed by a sensor, transmitted to a guideler and authenticationd as a plea restraint substituteing in veritable term the dosage of the chemical resolution. The sensor, the guideler, a cross-examine and the enjoin are compliant in a rest guide loop. The guideler guides the exercise of the cross-examine (speed, service cycle and the enjoy) to substitute the dosage established on the sensed stipulation, which is disrest as a inspectre and/or lamina of an atom of the enjoin, although other stipulations can guide the dosage as polite-behaved.
There is a deficiency restraint a chemical composition classification and contrive that adjustafter the aloft mentioned problems restraint the guide of inspectre and lamina.
3.2 Dignified Components
A chemical composition classification of the offer figment injects a chemical rereelucidation into a enjoin. The chemical composition classification comprises
A chemical tank embraceing the chemical resolution.
A cross-examine is compliant to furnish a dosage of the chemical rereelucidation from the tank to the enjoin.
A sensor and a guideler are compliant in a rest loop with the enjoin and the cross-examine to substitute in veritable term the dosage of the chemical rereelucidation furnishd by the cross-examine established on a stipulation of the enjoin sensed by the sensor and transmitted to the guideler.
A dosing pot
Stirrer ( Agitator )
Interconnecting Piping Instruments enjoy Prevailingssure Gauges, Equalize Gauges, Equalize Switches, PRV
3.2 Exercise of Chemical Dosing Classification
Chemical insertion classifications ramble from homely self-sufficient/self instructoring chemical dosing classifications with smunimpaired tanks, to multichemical insertion classifications, guideled by enjoin recoverback via programmable logic guidelers (PLC’s). Regardless of the collision, dosing classifications are usually painted to feel-goods with stint feasible authentication of prevailingvailing and support composition chemicals. They are inherantly chemical-lean and simply authentication what is compulsory to mould undeep adjustments to the adjust and normality of constituents in the recaggravate and consequence introduce.
A introduce composition classification that relies on the very-plenteous fertile authentication of chemicals, subjugates playing consumes, environmental collision and, in divers cases, subjugates or ejects the deficiency restraint dissipate classification.
In the pneumatic area of the cross-examine, the housed immateriality produces a diaphragm’s progressment that pushes extinguished the clear through the exhibition hose. The vacuum created by the diaphragm progressment chooses the clear inplane the cross-examine division from the suction hose.
3.3 Advantages of Chemical Dosing:
Sunk Cardinal Consume Prevailingvailing or Support Composition of Enjoin Introduce
Smunimpaired Quantity Demandments
Sunk Playing Consume
Very-plenteous Dignified Component of Prevailingcomposition Strategy restraint RO
The Bulkyr the Introduce Demand from and RO, the elevate enjoyly that Chemical Dosing procure be the most Consume-able Choice
MAJOR CAUSES OF DAMAGE & THEIR TREATMENTS
Depending on the paint and dregs and introduce Chemistry, introduce composition program may embrace some or unimpaired of the cethcoming:
1) Inspectre Debaror
4) Lamina Debaror
Figure 4.1: Corroded Demeanor
Inspectre is an electrochemical reexercise converting the metal into its oxide. Inspectre demands an anode, cathode & an electrolyte. The metal impresss as an anode & cathode conjuncture introduce impresss as an electrolyte.
4.1.2 Factors imposing the blame of Inactivity
a) Metallurgy of the classification
b) PH of circulating introduce
c) Dissolved gases
d) Dissolved and pendulous solids
e) Introduce fleetness
g) Microbial expandth
Figure 4.2: Beneath Safety Inspectre View behind Untarnisheding
4.1.3 Dignified emblems of Inspectre normally establish in Subsidence Introduce Classifications
a) General emblem of inactivity
b) Localized inactivity
c) Inspectre imputable of fleetness
d) Inspectre imputable to unimpassioned stress
4.1.4 How do Inspectre Debarors work
Figure 4.3: Basic Enjoin
The Inspectre Debarors offer in Introduce Composition Chemicals restraintm the ignoringivation film on the metal demeanor. Thus this demeanor is impercolable to ions asprognostic or oxygen attacks and this ceaserier is arresting the inactivity.
As the film is very slender, it in no contrive desires the excitement assign.
Inhibitor dosage classifications restraint-this-reason authentication a introduce meter in the mould-up accoutre to the subsidence aspire to feel-goods chemical dosing cross-examine to subjoin chemicals in plain proconcern to the mould up introduce run.
Figure 4.3: Scaling
Scaling is defined as the unyielding and coadjutor safetys restraintmed imputable to prevailingcipitation of sparingly discerptible salts in introduce. The most commsimply choose-placering scalants in subsidence introduce classifications are carbonates, sulphates, phosphates and silicates of calcium and magnesium.
The lamina safetys surrender agitate to the cethcoming problems in subsidence introduce classifications:
a) Subjugated excitement asprognostic decreasing the excitement asprognostic procureingness.
b) Acceptiond prevailingssure descend on introduce projecte.
c) Beneath Safety Inactivity.
The lamina safetys surrender agitate to the cethcoming problems in subsidence introduce classifications:
a) Subjugated excitement asprognostic decreasing the excitement asprognostic procureingness.
b) Acceptiond prevailingssure descend on introduce projecte.
c) Beneath Safety Inactivity.
Forthcoming are the factors which desire the scaling in subsidence introduce classification:-
4.2.2 How do antiscalants work
Restraint scaling to restraintm, the crystal of scaling salt has to expand equally in enlightenedness.
When the crystal is expanding the Antiscalant is exhausted on the crystal, blocking the expandth position. Thus the crystal canreferable expand in enlightenedness. Even it the crystal expands, it is vile and the constitution is very fluffy. The smunimpaired or fluffy crystals canreferable restraintm unyielding safetys hence Scaling does referable choose-place. In prevailingsence of Antiscalant, the metal demeanor scum clear from Scaling.
The Antiscalants debar lamina restraintmation by increasing the solubility of scalants in introduce and aid to stop prevailingferable equalizes of scalants in dissolved restraintm.
Figure 4.4: Electron Photomicrographs showing lamina withextinguished antiscalant
Figure 4.5: Electron Photomicrographs showing lamina with antiscalant
Figure 4.6: Fowling
Fouling is the appearance of pendulous sundericles. The sundericulate substance generally accumulates at sunk fleetness areas in the subsidence introduce classification. If subsidence introduce is on the shell projecte of the excitement exchanger then becaauthentication of sunk fleetness the fouling established-forthative establishedtles on the shell projecte
4.3.2 Implicit Foulants in Subsidence Introduce Classification
a) Dust and examine.
b) Inspectre Consequences.
d) Probable constitutionals
e) Microbial substance
4.3.3 Factors Imposing Fouling of the classification
a) Introduce characteristics
c) Introduce fleetness
d) Microbial expandth
4.3.4 How do Antifowlants work
Figure 4.7: Working of an antifoulant
Restraint fouling to choose situate, smunimpaired pendulous sundericles keep to after concomitantly to restraintm Agglomerate. Most of the pendulous substance is in the colloidal established-forth and keep a smunimpaired electric arraign on them.
ANTIFOULANT is polymeric in normality and when it is exhausted on pendulous sundericles, it procure acception the privative arraign on the sundericle. As enjoy arraigns check, the pendulous sundericles are thus kept away, prevailingventing their agglomeration. The sundericles thus redeep dispersed in the introduce and are prevailingvented from safetying and fouling the classification.
4.4 Microbial Expandth
Subsidence introduce surrenders the justifiable stipulations restraint expandth of opposed microorganisms. The sphere and pH of circulating introduce are poetical stipulations restraint the expandth of algae and opposed bacteria’s. Too the constitutional substance, inconstitutional salts, sunlight awe. furnishs riches of nutrients restraint the expandth of these microorganisms. Cethcoming are the problems faced becaauthentication of opposed microorganisms:
4.4.2 Dignified Microbes
Figure 4.8: Algae
Air, introduce & sunlight are the three basic demandments restraint algae expandth. Extravagant expandth of algae on the equip of subsidence aspire can stifle the distributor nozzles and subjugate the introduce run through subsidence aspire thus reducing its procureingness. Extravagant expandth on the louvers, satisfy established-forthative acceptions the raise on constitution and may caauthentication the demand of constitution. Algae concretion can too earn raise into the excitement exchangers and hinder the exchanger tubes.
Figure 4.9: Bacteria as seen beneath an microscope
There are opposed letter of bacteria establish in subsidence introduce classification.
Vile Subsidence Aspire Bacteria:
I Pseudomonas: These are aerobic bacteria, which conceal slime. This slime impresss as a restraining established-forthative and fouls the Classification.
II Sulphate Reducing Bacteria: These are anaerobic bacteria which subjugates sulphate ions to sulphides. These bacteria expand beneath the safetys and yields beneath safety inactivity.
There are too other aerobic bacteria enjoy nitrifying bacteria, which subjugates the pH of circulating introduce and able-bodied bacteria and sulphur oxidizing bacteria which hinder the procureingness of the classification.
Biocides are chemicals that inhumefere with basic animation enjoin of a cell.
Figure 4.10: Biocides
Biocides impress as a malignant established-forthative to the Algae cells. They procure either bursting the cell wunimpaired or earn into the cell and inconvenience the metabolism inplane the cell.
Biocides murder Algae in lacking days of term. Normal dosage of Biocides procure referable unimpairedow Algae to expand, uninterruptedly ruined. Murdering of Algae is the apparent prognostic of the impression of Biocides as the lifeless Algae procure reverse from Green to Yellowish-brown.
However, if modeblame expandth of Algae is very violent, it procure be expedient to untarnished the Algae manually as plenteous as feasible. Otherwise, there is a befoulment of lifeless Algae seemly a bulky concretion of foulants in the introduce and chocking the strainers in the pipelines.
Span options are available:-
Non-Oxidising Biocides – Normally sburning dosed on an alternating plea, usually uninterruptedly or twice per week using termr guideled dosing cross-examines. Normally, non-oxidising biocides demand a continuity term of 4 hours at a established restraintce to ruin bacteria. As prevailingviously involved, where conductivity bleed-off classifications are everyureing a bleed lockextinguished classification is demandd to prevailingvent faintness and dropping of biocide to bleed-off.
Oxidising biocides – Chlorine or Bromine. Chlorine should simply be authenticationd where pH equalizes are betwixt 6.5 and 7.8. At prevailingferable pH, chlorine is proportionately unreactive and a faulty biocide. Its authentication is restraint-this-reason prejudiced to industrial subsidence aspires incorporating pH guide. Bromine is consequenceive at pH equalizes up to 9.0, aloft which its biocidal consequence descends prognosticificantly requiring extravagant dosage blames.
Oxidising biocides are normally dosed uniformly at a sunk equalize to guard a established zephyr equalize in the recirculating introduce. The equalize of zephyr can be instructored electrically using Redox (Oxidation Diminution Implicit – ORP) or a inequitable chlorine instructor. Becaauthentication of their consume and sensitivity to stain inequitable chlorine or bromine instructors are casually authenticationd.
Redox (ORP) guide measures the oxidation and diminution implicit in millivolts in the introduce adjust a ramble of 0 to 1000 mV. This is kindred to the equalize of bromine oxidant offer and authentications homely technology concordant to pH mass. Whilst Redox is desireed by substitutes in pH this has no prognosticificant consequence on their achievement in subsidence introduce composition as most subsidence aspires feel-goods at a steady pH equalize.
CHEMICAL TREATMENT IN COOLING TOWERS
Introduce kindred problems associated with the exercise of subsidence aspires embrace:
The principal atom of subsidence introduce composition is the guide of cycles of restraintce, consequenceing from evaporative droppinges, by regulating the bleed or blowdown from the classification. Tarearn cycles of restraintce are solid by circumspect the Ryznar Index, the estimate of which is a service of the mould-up introduce characteristics. Impressual cycles of restraintce are facile usually by comparing the restraintce of chlorides in the mould-up introduce to the
force of chlorides in the recirculating introduce. Proper guide of cycles of restraintce subjugates twain scaling and inactivity.
A assist atom of subsidence introduce composition is the subsistence of a protective restraintce of inspectre debaror. This debaror is commsimply in the restraintm of chromate, phosphate, zinc, or proprietary coalescence, the restraintces of which are bulkyly hanging on the characteristics of the mould-up introduce.
Recaggravate of sulfuric hard, authenticationd to guide the scaling or fouling normality of the circulating introduce, is a general third guide atom. Recaggravate of chlorine and/or biocide, authenticationd to eject micro-biological impressivity is the fourth guide atom.
CHEMICAL TREATMENT IN CHILLERS
Introduce kindred problems associated with the exercise of Chillers embrace:
The chilled introduce loop, which feel-effects twain inhumenally and externally, to the chiller should be considered as animation a rest subsidence introduce classification which has a negligible total of mould-up.
Chemical composition to engagement problems of inspectre and fouling embrace satisfexercise the classification with introduce having a pH wislender the ramble of 7.0 to 8.5, and guarding a residual of sodium sulfite at 20 – 60 ppm.
The condenser subsidence introduce, if “once-through”, is referable normally chemically treated.
DESIGN ANALYSIS OF CHEMICAL DOSING SYSTEM OF CHILLER & CONDENSER WATER STREAMS IN A SHOPPING MALL
8.1 Description of the Dregs of the Paint Classification
The Chemical Dosing Classification is to be painted restraint Shopping Munimpaired is located at a prevailingmier dregs in the city with a built up area of 269000 sq meters good-tempered-tempered-natured 428 shops including thread shops, Food & Beverage Extinguishedlets. The ease has an Impressivity Center of 2300 sq meters which houses unimpaired the dignified equipment restraint MEP Utilitys such as six Centrifugal Chillers, 6 Subsidence Aspires, 6 Earliest Chilled Introduce Cross-examines, 6 Condenser Introduce Cross-examines, Asprognostic Cross-examines awe.
Chilled Introduce Classification
The chilled introduce earliest classification of the munimpaired caters the chilled introduce from impressivity centre to opposed cross-examine rooms located at roof via 6 no’s. Earliest cross-examines.
The earliest – assistary inhumefacing embraces DPCV, motorised valves, commissioning establisheds and a by ignoring, unimpaired the valves are located inplane the idiosyncratic cross-examine rooms.
The earliest divisioner enlightenedness varies from 1000mm-400mm unimpaired adjust the roof.
The assistary cross-examines publish the introduce to the unimpaired munimpaired from 8 opposed cross-examine rooms located at roof.
Condenser Introduce Classification
The condenser introduce classification consists of span inhanging networks.
Condenser Circuit I consists of 3 Nos. condensers & 3 Nos. subsidence aspires.
The Condenser Circuit II consists of 4 (3+1Future) condensers & 4 (3+1Future) Subsidence aspires.
Emblem of Paint
Restraint total introduce composition program to be ampley consequenceive, amend chemical dosing is demandd. If composition equalizes are too sunk, then lamina and inspectre and fouling may consequence. Unfortunately, manual dosing is wholly fictitious ateing reproduce consequences are endd by unimpassioned dosing which guards a violent equalize of correctness.
Unimpassioned Guideler is total with ampley unimpassioned guideler, dosing cross-examine, chemical tank, suction & disarraign proportioneds, tubing, conductivity measuring cells and cell connector awe.
8.3 Paint Considerations
The paint aloft shows a normal provision restraint a chemical dosing classification.
The cethcoming are the deep components of a classification.
8.3.1 Dosing Tank
The dosing tank should be enlightenednessd to abide equal chemical restraint the classification to feel-goods betwixt normal subsistence checks. Most membrane classifications are instructored at meanest daily, restraint-this-reason these tanks could hypothetically be enlightenednessd to abide 24 hours accoutre. However, providing good-tempered-tempered-tempered housekeeping is mannerd, the chemical may be stored in the tank restraint divers weeks withextinguished inconvenience to the chemical or its consequenceiveness.
The tank should be furnishd with a rest proportioned lid to prevailingvent filth adit to the tank. Adjustflows and drains should be plained to the chemical dissipate classification, or to a bund from which any dissipate can be managed amendly. The most vile established-forthatives restraint the tanks are plastics, in-particular violent-density polyethylene.
If the sizing of the dosing cross-examine has warranted the faintness of the chemical, the tank should enjoin some contrive of mixing the antiscalant with the faintness introduce. A operative feel-effectd paddle mixer is the most normally employed, as the demandd mixing impressivity is very sunk and uninterruptedly ampley homogenised the rereelucidation procure referable severed and restraint-this-reason procure referable demand elevate mixing.
Dosing tanks should be guarded in a untarnished stipulation. This is in-particular dignified where paralyze chemical is applied and it is suggested that the dosing tank is untarnisheded extinguished every 6 months to prevailingvent bacterial expandth. Alternatively, a prevailingservative could be prevailingtended
to the resolution.
8.3.2 Dosing Cross-examine
The dosing cross-examines should be enlightenednessd to unimpairedow the clear dose at betwixt 40 – 80% of the tonnage of the cross-examine. This procure unimpairedow the dose blame to be acceptiond should the introduce tonnage substitute, and it is compulsory to substitute the dose blame.
The dignifiedity of membrane classifications feel-goods at stated or nigh stated run blames, and restraint-this-reason most chemicals are dosed at a unwandering blame. If the runrates are to substitute by elevate than 20%, then it may be compulsory to substitute the dosing blame with the runblame to the membrane classification. The dosing cross-examine should be painted to surrender as everyay a run of chemical to the projectt as feasible. With fixed misunderstanding dosing cross-examines normal pulses of chemical are prevailingferred – generally the pulse should feel-goods at an independent culmination of 5 assist inhumevals. Care deficiencys to be choosen to prevailingvent siphoning of the chemical tank contents during dosing cross-examine prevailingcludedown periods.
It is referable normally compulsory to mould eespecial provisions restraint the mixing of antiscalants, coagulants, biocides or inanimate subjoinitives into the deep enjoin exit as unimpaired are very amalgamate with introduce.
8.3.4 Calibration Tube
Although a good-tempered-tempered-tempered admission of the dosing cross-examine exhibition blame can be made by regard to the cross-examine incurvation, it is impetuously recommended that a calibration tube is everyureing to the suction projecte of the cross-examine to unimpairedow the dose blame to be facile precisely.
Dosing errors choose-situate when chemical recaggravate cross-examines are referable calibra