The Habitual and Electrical Resistance of ETA ASCON Group has been a avant-courier in the arena of electrohabitual contracting in the UAE repress aggravate 25 years. ETA M & E has recurrentityic itself as a peculiarity of peculiarity and newfangledness. Customers of ETA M & E are guaranteed and acquiescent with the competitive employment packages. M & E resistance is consecrated to peculiarity of indexiwork and bombardment in “particularize of the art” technology repress the Client’s utility.
The resistance exhibits a distant rove of employments including produce and installation repress the subjoined recurrentity:
Principle Terming Recurrentitys
Fire Protection Recurrentitys
Kitchen Recurrentitys, and
ELV Recurrentitys such as:
Telephidiosyncratic PABX Recurrentity
CO Detection recurrentity
Fire Alarm Recurrentity
Erection Management Recurrentity
Door Access repress Recurrentity
M & E affords recurrentity integration and inhume operability repress total these recurrentitys.
M&E compliments the skills of its staff by using the past technology. Repress complimentary contrivance, the contrivance and engineering gaing is equipped with a recent Computer Avoided Contrivance (CAD) recurrentity and impressment facilities. M&E entertain didiosyncratic projects repress a sum of predominantstigious erections twain wholesale and residential, fieryels, shopping malls, banks, cinemas, hospitals, universities, Principleports, Railways/Metro stations, IT Parks, message and Industrial Projects.
M&E has extent and faculty to treat projects of any concretion and depend on commitments towards satisfying client’s insist-uponments. M&E has besides perfect its execution in Egypt, Kuwait, Qatar, Yemen and India. 
M&E is the leading electro-habitual concourse in the UAE, who entertain been awarded
ISO 9001-2000 certification by LRQA.
Dubai Peculiarity Appreciation Program, Dubai.
Sheikh Khalifa Excellence Award, Abu Dhabi.
ISO certificate: M&E Resistance is the leading MEP Contracting Concourse in UAE, to assent-to the ISO 9001-2000 Accreditation repress Inhumenational Peculiarity Project Management by Lloyd’s Register Peculiarity Assurance Ltd, UK.
Dubai Peculiarity Award 2002: The leading Electrohabitual Concourse in the UAE to be awarded with the predominantstigious Certificate of Appreciation beunsatisfactory the Dubai Peculiarity Appreciation Program Award 2002 established by the Government of Dubai and bestowed by H.H General Sheikh Mohammed Bin Rashid Al Maktoum, Crown Prince of Dubai and Defence Minister of UAE.
Sheikh Khalifa Award 2002: The leading Electrohabitual Concourse in the UAE to gain the coveted Peculiarity Appreciation Certificate Fourth Cycle (2002-2003) beunsatisfactory Sheikh Khalifa Excellence Award Committee established by Government of Abu Dhabi. 
Listing scant of the projects produced:-
Hotels, Shopping Malls & Cinemas
Conference Palace Fieryel, Abu Dhabi.
Emirates Aspire Fieryel, Dubai.
Sofitel Fieryel, Sherm-el-Sheikh, Cairo.
Al Ghurprinciple City, Dubai.
Deira City Capital, Dubai.
Cineplex & Cine Star, Dubai.
Wholesale and Residential Erections, Banks & Principleports
Dubai Inhumenet City.
Dubai Media City.
21st Century & Capricorn Aspires.
Leading Gulf Bank & National Bank of Abu Dhabi.
Dubai Inhumenational Principleport – Renovation & annotation of Marginal 1.
Emirates Engineering Capital.
Cargo Marginal & Customs Import Erection, Sharjah Inhumenational Principleport.
Public Utilities, Hospitals & Industrial Projects.
Abu Dhabi Urbaneity Complex.
ETISALAT Erection, Dubai & Al Ain.
Dubai Health Care City.
Sheikh Zayed Cricket Stadium, Abu Dhabi.
New Medical Capital.
Oilarena Extrexercise Delineationt, Jebel Ali.
ENOC Ruleing Delineationt, JAFZA.
Caterpillar Logistics, Jebel Ali.
Neo Pharma, Abu Dhabi.
Central Delineationts & Industrial Kitchens
Central Chiller Delineationts repress Emirates Aspire, Dubai Marina and Deira City Capital.
Industrial Kitchens repress Conference Palace Fieryel and Emirates Aspire.
The resistance’s impressivities entertain distant to retail traffic, sale of equipment through showrooms, divergeelucidation projects, subsistence employment contracts and re-export to other countries.
Other predominantstigious projects produced are:
Dubai Police Projects.
Al Maha Resort.
Palm Island sales employment.
Total EMARAT, ENOC and EPPCO contribute stations in UAE. 
Chemical Substance/Dosing Recurrentity
The responsibility of byion exclusion recurrentity in principle-conditioning installation is to refreason byion to the environment. Subsidence aspires and evaporative condensers timids the favorionate breathe-into by totalow straightforward adjunction among elysian principle and the breathe-into. Becareason of the catholic extent of principle, fundamental symbolical and other sweepings can be accumulated. It is recommended that the recurrentity be sustained genuine and a correspondent breathe-into substance program be reasond.
Chemical Dosing is such a chemical substance recurrentity that injects a dosage chemical disconnection into a rule.
HVAC depends repress the enthusiasm-tight totalied responsibilitys of “Heating, Ventilating, and Principle Terming”- the technology of indoor environmental self-approval. HVAC recurrentity contrivance is a senior sub training of habitual engineering, deepd on the principles of thermodynamics, clear mechanics, and byion transplant.
HVAC is chiefly dignified in the contrivance of medium to catholic industrial and employment erections such as skyscrapers and in marine environments such as aquariums, where unendangered and healthful erection stipulations are regulated with essential-power and humidity, as polite-behaved-behaved as “fresh principle” from extinguisheddoors.
2.2 Senior Components of HVAC Recurrentity
2.2.1 Subsidence Aspires
Fig 2.1 Subsidence Aspire Execution
Subsidence aspire recurrentitys attenuate the essential-power of breathe-into by conduction and evaporation.
Conduction is straightforwardly interrelationshipal to the quantity of breathe-into – principle deportment inhumeface and the distinction among the breathe-into essential-power and the ambient principle parched bulb essential-quality. This tangible byion transplantred by straightforward principle adjunction quantitys to 1 Btu repress each pulverize of breathe-into timided 1o F. Byion transset by evaporation is interrelationshipal to the distinction among the breathe-into essential-power and the ambient principle humid bulb essential-quality. Approximately 1,000 Btu’s of byion are transportd when idiosyncratic pulverize of favorionate breathe-into is evaporated. This implicit byion is consecrated up by the recirculating breathe-into, thus dark its essential-quality.
In habit, favorionate rule breathe-into is cross-examideficiency to the eminent behalf of the aspire et the glut where it enters distributors which diffreason the breathe-into evenly aggravate the glut. The breathe-into cascades beneath as drooplets and is unmoved in the basin repress reason in the subsidence recurrentity.
Heated breathe-into is returned to the aspire repress subsidence and reuse.
220.127.116.11 Characters of Subsidence Aspires
The span senior categories of subsidence aspires are the cosmical drain and habitual drain.
Cosmical drain aspires can be excite sub-divided into elysian and hyperbolic aspires. Cosmical drain aspires sustain a career of principle upward through the aspire becareason the timid, stolid principle at the depth repressces the lighter, breathe-into saturated principle extinguished the summit. Considerable gaindage is insist-upond to procure ample byion transset with this character of aspire. Hyperbolic aspires husband their noble apex, which affords a
chimney pi, to favor catholic extents of principle upward through the aspire.
Habitual drain subsidence aspires reason fans to repress the principleflow.
When fans are located at the principle penetration at the deep of the aspire, it is named a repressced drain aspire; when fans are located at the summit of the aspire, it is named an requisite drain aspire.
Fig 2.2: Chiller Execution
A chiller is a tool that transports byion from a mellifluous via a vapor-compression or parching composure cycle. A vapor-compression breathe-into chiller comprises the 4 senior components of the vapor-compression composure cycle (compressor, evaporator, condenser, and some repressm of metering project). These tools can appliance a miscellany of refrigerants. Adsorption chillers reason urbane breathe-into as the refrigerant and benevolent silica gel as the desiccant. Parching chillers husband breathe-into as the refrigerant and depend on the solid sympathy among the breathe-into and a lithium bromide disconnection to finish a composure pi. Most recurrently, genuine breathe-into is chilled, endring this breathe-into may besides comprehend a percentage of glycol and/or inessence debarors; other clears such as lean oils can be chilled as polite-behaved.
In principle terming recurrentitys, chilled breathe-into is recurrently exclusive to byion exchangers, or spirals, in principle indexling units, or other character of marginal projects which timid the principle in its relative room(s), and then the chilled breathe-into is re-circulated tail to the chiller to be timided again. These subsidence spirals transset tangible byion and implicit byion from the principle to the chilled breathe-into, thus subsidence and usually dehumidifying the principle drift. A recurrent chiller repress principle terming collisions is rebuked among 15 to 1500 tons (180,000 to 18,000,000 BTU/h or 53 to 5,300 kW) in subsidence extent. Chilled breathe-into essential-qualitys can rove from 35 to 45 degrees Fahrenheit or 1.5 to 7 degrees Celsius, depending upon collision insist-uponments.
Fig 2.3 Chiller
18.104.22.168 Characters of Chillers
Breathe-into chillers can be either breathe-into timided, principle-cooled, or evaporatively timided.
Water-cooled chillers solder the reason of subsidence aspires which ameliorebuke the chillers’ thermodynamic piiveness as compared to principle-cooled chillers. This is attributable to byion exclusion at or adjacent the principle’s humid-bulb essential-power rather than the conspicuous, casually plenteous conspicuous, parched-bulb essential-quality. Breathe-into timided chillers are recurrently intentional repress indoor installation and execution, and are timided by a divergent condenser breathe-into loop and united to extinguisheddoor subsidence aspires to cast byion to the sphere.
Evaporatively timided chillers exhibit efficiencies rearrank than principle timided, endring inferior than breathe-into timided.
Principle Timided and Evaporatively Timided chillers are intentional repress extinguisheddoor installation and execution. Principle timided tools are straightforwardly timided by ambient principle substance habitually spreadd straightforwardly through the tool’s condenser spiral to cast byion to the sphere. Evaporatively timided tools are homogeneous, exclude they appliance a moisture of breathe-into aggravate the condenser spiral to avoid in condenser subsidence, making the tool past prolific than a oral principle timided tool. No alien subsidence aspire is recurrently insist-upond with either of these characters of packaged principle timided or evaporatively timided chillers.
22.214.171.124 Chiller By-By Execution
Fig 2.4 Chiller By- By Provision
In adjust to husband on the ability lessening of a chiller, these units are casually by-passed and contrimpress down during the bestow separebuke and the cessation separebuke of the principle-conditioning durationliness.
As implied, connections on the fiery and calm party of the chiller circulating breathe-into are made to the fiery and calm party of the subsidence aspire circulating breathe-into and isolating valves are predominanttended.
During the bestow and cessation disconnecteds of the principle-conditioning durationliness, the chiller is humble and contrimpress down, thus totalowing the subsidence aspire to afford subsidence repress the principle-conditioner.
As the recurrentity subsidence admonish acceptions, the subsidence aspire may referable attributable attributable attributable attributable attributable attributable entertain the extent to refavor the insist-upond quantity of byion. During these periods, the subsidence aspire is humble and the chiller is brought into execution.
Chillers enimpress a bulky distinguished bombardment and are a senior confederebuke to exempt absorbs in institutional and wholesale facilities. Repress sundry organizations, chillers are the catholicst idiosyncratic enthusiasm reasonrs, and generic subsistence is predominantcarious to secure their reliability and prolific execution.
Conjuncture some organizations reason suggestive subsistence – including bill anatomy, infrared thermography, and rotor end testing – to diagnose problems in track, a generic counteractive subsistence (PM) delineation dregs the elucidation to ensuring the best execution and teachableness of a chiller.
Chemical Dosing Recurrentity is a chemical substance recurrentity that injects a dosage chemical disconnection into a rule. A term of the rule is sensed by a sensor, conveyred to a repressler and reasond as a plea repress diversifying in existent duration the dosage of the chemical disconnection. The sensor, the repressler, a cross-examine and the rule are quick in a secretive repress loop. The repressler represss the execution of the cross-examine (speed, responsibility cycle and the enjoy) to diversify the dosage deepd on the sensed term, which is unreserved as a inessence and/or lamina of an atom of the rule, although other stipulations can repress the dosage as polite-behaved.
There is a deficiency repress a chemical substance recurrentity and recurrentity that aggravatesucceed the et mentioned problems repress the repress of inessence and lamina.
3.2 Senior Components
A chemical substance recurrentity of the bestow figment injects a chemical disconnection into a rule. The chemical substance recurrentity comprises
A chemical tank comprehending the chemical disconnection.
A cross-examine is quick to afford a dosage of the chemical disconnection from the tank to the rule.
A sensor and a repressler are quick in a secretive loop with the rule and the cross-examine to diversify in existent duration the dosage of the chemical disconnection affordd by the cross-examine deepd on a term of the rule sensed by the sensor and conveyred to the repressler.
A dosing pot
Stirrer ( Agitator )
Interconnecting Piping Instruments enjoy Predominantssure Gauges, Raze Gauges, Raze Switches, PRV
3.2 Execution of Chemical Dosing Recurrentity
Chemical insertion recurrentitys rove from unsophisticated self-sufficient/self instructoring chemical dosing recurrentitys with smtotal tanks, to multichemical insertion recurrentitys, repressled by rule recoverback via programmable logic represslers (PLC’s). Regardless of the collision, dosing recurrentitys are usually contrivanceed to impress with insufficiency feasible reason of predominantdominant and support substance chemicals. They are inherantly chemical-lean and solely reason what is expedient to frame unweighty adjustments to the et and recurrentity of constituents in the recaggravate and consequence breathe-into.
A breathe-into substance recurrentity that relies on the exceedingly prolific reason of chemicals, attenuates exempt absorbs, environmental impression and, in sundry cases, attenuates or elucidates the deficiency repress pine division.
In the pneumatic area of the cross-examine, the compimpress principle produces a diaphragm’s favorment that pushes extinguished the mellifluous through the bestowal hose. The vacuum created by the diaphragm favorment admits the mellifluous inparty the cross-examine top from the suction hose.
3.3 Advantages of Chemical Dosing:
Unsatisfactory Distinguished Absorb Predominantdominant or Support Substance of Rule Breathe-into
Smtotal Room Insist-uponments
Unsatisfactory Exempt Absorb
Exceedingly Dignified Component of Predominantsubstance Strategy repress RO
The Catholicr the Breathe-into Demand from and RO, the past enjoyly that Chemical Dosing conciliate be the most Absorb-effectual Choice
MAJOR CAUSES OF DAMAGE & THEIR TREATMENTS
Depending on the contrivance and dregs and breathe-into Chemistry, breathe-into substance program may embody some or total of the subjoined:
1) Inessence Debaror
4) Lamina Debaror
Figure 4.1: Corroded Deportment
Inessence is an electrochemical reexercise converting the metal into its oxide. Inessence insist-upons an anode, cathode & an electrolyte. The metal impresss as an anode & cathode conjuncture breathe-into impresss as an electrolyte.
4.1.2 Factors favoring the rebuke of Inactivity
a) Metallurgy of the recurrentity
b) PH of circulating breathe-into
c) Dissolved gases
d) Dissolved and hanging solids
e) Breathe-into fleetness
g) Microbial expandth
Figure 4.2: Beunsatisfactory Warranty Inessence View behind Genuineing
4.1.3 Dignified characters of Inessence recurrently base in Subsidence Breathe-into Recurrentitys
a) General character of inactivity
b) Localized inactivity
c) Inessence attributable of fleetness
d) Inessence attributable to habitual stress
4.1.4 How do Inessence Debarors work
Figure 4.3: Basic Rule
The Inessence Debarors bestow in Breathe-into Substance Chemicals repressm the byivation film on the metal deportment. Thus this deportment is impermeable to ions transset or oxygen attacks and this endrier is arresting the inactivity.
As the film is very lean, it in no practice favors the byion transplant.
Inhibitor dosage recurrentitys hereafter reason a breathe-into meter in the frame-up produce to the subsidence aspire to impress chemical dosing cross-examine to gather chemicals in straightforward probehalf to the frame up breathe-into career.
Figure 4.3: Scaling
Scaling is defined as the constrained and supporter warrantys repressmed attributable to predominantcipitation of partially discerptible salts in breathe-into. The most commsolely supervenering scalants in subsidence breathe-into recurrentitys are carbonates, sulphates, phosphates and silicates of calcium and magnesium.
The lamina warrantys produce loosen to the subjoined problems in subsidence breathe-into recurrentitys:
a) Attenuated byion transset decreasing the byion transset teachableness.
b) Acceptiond predominantssure droop on breathe-into party.
c) Beunsatisfactory Warranty Inactivity.
The lamina warrantys produce loosen to the subjoined problems in subsidence breathe-into recurrentitys:
a) Attenuated byion transset decreasing the byion transset teachableness.
b) Acceptiond predominantssure droop on breathe-into party.
c) Beunsatisfactory Warranty Inactivity.
Subjoined are the factors which favor the scaling in subsidence breathe-into recurrentity:-
4.2.2 How do antiscalants work
Repress scaling to repressm, the crystal of scaling salt has to expand competently in extent.
When the crystal is expanding the Antiscalant is fascinated on the crystal, blocking the expandth site. Thus the crystal canreferable attributable attributable expand in extent. Even it the crystal expands, it is niggardly and the erection is very fluffy. The smtotal or fluffy crystals canreferable attributable attributable repressm constrained warrantys hereafter Scaling does referable attributable attributable attributable attributable attributable attributable supervene. In predominantsence of Antiscalant, the metal deportment dregs munificent from Scaling.
The Antiscalants debar lamina repressmation by increasing the solubility of scalants in breathe-into and acceleration to rest conspicuous razes of scalants in dissolved repressm.
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 illustration of hanging disconnectedicles. The disconnectediculate substance generally accumulates at unsatisfactory fleetness areas in the subsidence breathe-into recurrentity. If subsidence breathe-into is on the shell party of the byion exchanger then becareason of unsatisfactory fleetness the fouling symbolical betles on the shell party
4.3.2 Implicit Foulants in Subsidence Breathe-into Recurrentity
a) Dust and explore.
b) Inessence Consequences.
d) Cosmical fundamentals
e) Microbial substance
4.3.3 Factors Favoring Fouling of the recurrentity
a) Breathe-into characteristics
c) Breathe-into fleetness
d) Microbial expandth
4.3.4 How do Antifowlants work
Figure 4.7: Working of an antifoulant
Repress fouling to admit betle, smtotal hanging disconnectedicles entertain to succeed concomitantly to repressm Agglomerate. Most of the hanging substance is in the colloidal particularize and entertain a smtotal electric accauthentication on them.
ANTIFOULANT is polymeric in recurrentity and when it is fascinated on hanging disconnectedicles, it conciliate acception the indirect accauthentication on the disconnectedicle. As enjoy accuses check, the hanging disconnectedicles are thus kept aloof, predominantventing their agglomeration. The disconnectedicles thus alight injudiciously in the breathe-into and are predominantvented from warrantying and fouling the recurrentity.
4.4 Microbial Expandth
Subsidence breathe-into produces the distinguished stipulations repress expandth of multitudinous microorganisms. The essential-power and pH of circulating breathe-into are spiritual stipulations repress the expandth of algae and multitudinous bacteria’s. Besides the fundamental substance, infundamental salts, sunlight ceeseeing. affords plenty of nutrients repress the expandth of these microorganisms. Subjoined are the problems faced becareason of multitudinous microorganisms:
4.4.2 Senior Microbes
Figure 4.8: Algae
Air, breathe-into & sunlight are the three basic insist-uponments repress algae expandth. Enormous expandth of algae on the arrank of subsidence aspire can stifle the distributor nozzles and attenuate the breathe-into career through subsidence aspire thus reducing its teachableness. Enormous expandth on the louvers, glut symbolical acceptions the admonish on erection and may careason the want of erection. Algae body can besides procure raise into the byion exchangers and end the exchanger tubes.
Figure 4.9: Bacteria as seen beunsatisfactory an microscope
There are multitudinous order of bacteria base in subsidence breathe-into recurrentity.
Niggardly Subsidence Aspire Bacteria:
I Pseudomonas: These are aerobic bacteria, which conceal slime. This slime impresss as a absorbive symbolical and fouls the Recurrentity.
II Sulphate Reducing Bacteria: These are anaerobic bacteria which attenuates sulphate ions to sulphides. These bacteria expand beunsatisfactory the warrantys and yields beunsatisfactory warranty inactivity.
There are besides other aerobic bacteria enjoy nitrifying bacteria, which attenuates the pH of circulating breathe-into and brawny bacteria and sulphur oxidizing bacteria which hinder the teachableness of the recurrentity.
Biocides are chemicals that inhumefere with basic history rule of a cell.
Figure 4.10: Biocides
Biocides impress as a infect-ant symbolical to the Algae cells. They conciliate either breaking the cell wtotal or procure into the cell and hurt the metabolism inparty the cell.
Biocides despatch Algae in scant days of duration. Recurrent dosage of Biocides conciliate referable attributable attributable attributable attributable attributable attributable totalow Algae to expand, uniformly aggravatethrowed. Despatching of Algae is the palpable signalal of the impression of Biocides as the dull Algae conciliate diverge from Green to Yellowish-brown.
However, if modereprove expandth of Algae is very lofty, it conciliate be beneficial to genuine the Algae manually as plenteous as feasible. Otherwise, there is a coerciontuity of dull Algae decorous a catholic body of foulants in the breathe-into and chocking the strainers in the pipelines.
Span options are available:-
Non-Oxidising Biocides – Normally sfiery dosed on an alternating plea, usually uniformly or twice per week using durationr repressled dosing cross-examines. Recurrently, non-oxidising biocides insist-upon a adjunction duration of 4 hours at a be attention to aggravatethrow bacteria. As predominantviously implied, where conductivity bleed-off recurrentitys are cheerful a bleed lockextinguished recurrentity is insist-upond to predominantvent frailty and privation of biocide to bleed-off.
Oxidising biocides – Chlorine or Bromine. Chlorine should solely be reasond where pH razes are among 6.5 and 7.8. At conspicuous pH, chlorine is relatively unreactive and a unsatisfactory biocide. Its reason is hereafter onesided to industrial subsidence aspires incorporating pH repress. Bromine is piive at pH razes up to 9.0, et which its biocidal pi droops signalificantly requiring enormous dosage rebukes.
Oxidising biocides are normally dosed uniformly at a unsatisfactory raze to sustain a be scent raze in the recirculating breathe-into. The raze of scent can be instructored electrically using Redox (Oxidation Contraction Implicit – ORP) or a local chlorine instructor. Becareason of their absorb and sensitivity to stain local chlorine or bromine instructors are radepend reasond.
Redox (ORP) repress measures the oxidation and contraction implicit in millivolts in the breathe-into aggravate a rove of 0 to 1000 mV. This is totalied to the raze of bromine oxidant bestow and reasons unsophisticated technology homogeneous to pH bulk. Whilst Redox is favored by exchanges in pH this has no signalificant pi on their execution in subsidence breathe-into substance as most subsidence aspires impress at a steady pH raze.
CHEMICAL TREATMENT IN COOLING TOWERS
Breathe-into totalied problems associated with the execution of subsidence aspires embody:
The leading atom of subsidence breathe-into substance is the repress of cycles of attention, issueing from evaporative privationes, by regulating the bleed or blowdown from the recurrentity. Tarprocure cycles of attention are decided by sagacious the Ryznar Index, the esteem of which is a responsibility of the frame-up breathe-into characteristics. Impressual cycles of attention are adapted usually by comparing the attention of chlorides in the frame-up breathe-into to the
attention of chlorides in the recirculating breathe-into. Proper repress of cycles of attention attenuates twain scaling and inactivity.
A avoid atom of subsidence breathe-into substance is the subsistence of a protective attention of inessence debaror. This debaror is commsolely in the repressm of chromate, phosphate, zinc, or proprietary junction, the attentions of which are catholicly resting on the characteristics of the frame-up breathe-into.
Recaggravate of sulfuric afflictive, reasond to repress the scaling or fouling recurrentity of the circulating breathe-into, is a general third repress atom. Recaggravate of chlorine and/or biocide, reasond to elucidate micro-biological impressivity is the fourth repress atom.
CHEMICAL TREATMENT IN CHILLERS
Breathe-into totalied problems associated with the execution of Chillers embody:
The chilled breathe-into loop, which impresss twain inhumenally and extraneously, to the chiller should be considered as substance a secretive subsidence breathe-into recurrentity which has a negligible quantity of frame-up.
Chemical substance to conflict problems of inessence and fouling embody contribute the recurrentity with breathe-into having a pH wilean the rove of 7.0 to 8.5, and sustaining a residual of sodium sulfite at 20 – 60 ppm.
The condenser subsidence breathe-into, if “once-through”, is referable attributable attributable attributable attributable attributable attributable 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 Contrivance Recurrentity
The Chemical Dosing Recurrentity is to be contrivanceed repress Shopping Mtotal is located at a predominantmier dregs in the city with a built up area of 269000 sq meters complaisant 428 shops including length shops, Food & Beverage Extinguishedlets. The adroitness has an Enthusiasm Center of 2300 sq meters which houses total the senior equipment repress MEP Employments such as six Centrifugal Chillers, 6 Subsidence Aspires, 6 Earliest Chilled Breathe-into Cross-examines, 6 Condenser Breathe-into Cross-examines, Transset Cross-examines ceeseeing.
Chilled Breathe-into Recurrentity
The chilled breathe-into earliest recurrentity of the mtotal caters the chilled breathe-into from enthusiasm capital to divergent cross-examine rooms located at roof via 6 no’s. Earliest cross-examines.
The earliest – avoidary inhumefacing embodys DPCV, motorised valves, commissioning bes and a by by, total the valves are located inparty the idiosyncratic cross-examine rooms.
The earliest toper extent varies from 1000mm-400mm total aggravate the roof.
The avoidary cross-examines spread the breathe-into to the full mtotal from 8 divergent cross-examine rooms located at roof.
Condenser Breathe-into Recurrentity
The condenser breathe-into recurrentity consists of span inresting 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.
Character of Contrivance
Repress perfect breathe-into substance program to be ampley piive, chasten chemical dosing is insist-upond. If substance razes are too unsatisfactory, then lamina and inessence and fouling may issue. Unfortunately, manual dosing is thoroughly disputed endring rearrank issues are finishd by unimpassioned dosing which sustains a lofty raze of achievement.
Unimpassioned Repressler is perfect with ampley unimpassioned repressler, dosing cross-examine, chemical tank, suction & disaccauthentication fairs, tubing, conductivity measuring cells and cell connector ceeseeing.
8.3 Contrivance Considerations
The extinguishedline et shows a recurrent provision repress a chemical dosing recurrentity.
The subjoined are the ocean components of a recurrentity.
8.3.1 Dosing Tank
The dosing tank should be extentd to confide competent chemical repress the recurrentity to impress among recurrent subsistence checks. Most membrane recurrentitys are instructored at last daily, hereafter these tanks could hypothetically be extentd to confide 24 hours produce. However, providing cheerful housekeeping is habitd, the chemical may be stored in the tank repress sundry weeks withextinguished hurt to the chemical or its piiveness.
The tank should be affordd with a seal fair lid to predominantvent foulness porch to the tank. Aggravateflows and drains should be straightforwarded to the chemical pine recurrentity, or to a bund from which any pine can be treatd chastenly. The most niggardly symbolicals repress the tanks are plastics, chiefly lofty-density polyethylene.
If the sizing of the dosing cross-examine has well-founded the frailty of the chemical, the tank should enjoin some recurrentity of mixing the antiscalant with the frailty breathe-into. A index impressd paddle mixer is the most normally industrious, as the insist-upond mixing enthusiasm is very unsatisfactory and uniformly ampley homogenised the disconnection conciliate referable attributable attributable attributable attributable attributable attributable divergent and hereafter conciliate referable attributable attributable attributable attributable attributable attributable insist-upon excite mixing.
Dosing tanks should be sustained in a genuine term. This is distinctively dignified where enervate chemical is applied and it is suggested that the dosing tank is genuideficiency extinguished total 6 months to predominantvent bacterial expandth. Alternatively, a predominantservative could be predominanttended
to the disconnection.
8.3.2 Dosing Cross-examine
The dosing cross-examines should be extentd to totalow the exact dose at among 40 – 80% of the extent of the cross-examine. This conciliate totalow the dose rebuke to be acceptiond should the breathe-into peculiarity exchange, and it is expedient to exexexchange the dose rebuke.
The seniority of membrane recurrentitys impress at normal or adjacent normal career rebukes, and hereafter most chemicals are dosed at a urban rebuke. If the careerrates are to diversify by past than 20%, then it may be expedient to diversify the dosing rebuke with the careerrebuke to the membrane recurrentity. The dosing cross-examine should be contrivanceed to produce as flatten a career of chemical to the delineationt as feasible. With real misunderstanding dosing cross-examines recurrent pulses of chemical are predominantferred – generally the pulse should impress at an arbitrary ultimatum of 5 avoid inhumevals. Care deficiencys to be admitn to predominantvent siphoning of the chemical tank solution during dosing cross-examine contractdown periods.
It is referable attributable attributable attributable attributable attributable attributable normally expedient to frame distinctive provisions repress the mixing of antiscalants, coagulants, biocides or azoic gatheritives into the ocean rule drift as total are very compoundable with breathe-into.
8.3.4 Calibration Tube
Although a cheerful approximation of the dosing cross-examine bestowal rebuke can be made by relation to the cross-examine flexion, it is solidly recommended that a calibration tube is cheerful to the suction party of the cross-examine to totalow the dose rebuke to be adapted precisely.
Dosing errors supervene when chemical recaggravate cross-examines are referable attributable attributable attributable attributable attributable attributable calibra