EVAPORATIVE CONDENSER

Catalogue 2016

CONSTRUCTION 5 DESCRIPTION OF PARTS Casing in GFRP 6Heat exchanger coil 7WINDER Fans 8Drift eliminators 10 Recirculation pump 10Water filter system 11Water distribution system 11Inspection door 11SEALSKIN watertight system 11Level control 11

INTRODUCTION 4EOS Refrigeration 4The product 4

ACCESSORIES 12

SPECIFICATION 15 TECHNICAL INFORMATION AND DIMENSIONS

SELECTION 13 OF CONDENSER

SCHEDULE 19Colour catalogue 19

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INTRODUCTIONEVAPORATIVE CONDENSER

INTRODUCTIONDESCRIPTION OF PARTS

EOS REFRIGERATIONEOS Refrigeration Equipment is an international company which designs, manufactures and markets equipment for the market of industrial refrigeration, process cooling and air conditioning.

Our firm is composed of professionals with long experience in the sector. EOS offers innovative solutions of high technology, environmentally friendly and energy efficient.

THE PRODUCTEOS Refrigeration Equipment presents its new range of NEK evaporative condensers. These are forced draft evaporative condensers using axial fans fited with directly coupled motors and a casing of glass fibre reinforced polyester. This range is specially designed for the field of industrial refrigeration, air conditioning and all kinds of steam condensation processes.

The units are fited with SUPER SILENCE TECH technology which means that they are very quiet.

The NEK range is conceived for correct installation and functioning even in category C5 atmospheres (maximum degree of corrosion according to standard ISO 9223:1992 – marine or heavy industry environments).

The range of capacities of NEK evaporative condensers is between 350 kW and 4800 kW. These condensers work with a large variety of refrigerants (R717, R404A, R507A, R134a, R407A, etc.) and offer extraordinary facility of maintenance in any type of installation.

NEK condensers are high energy efficiency units due to the combination of WINDER technology in the fan blades and motors of new efficiency class IE3, together with their modular, innovative design.

1. CASING IN GFRP

2. HEAT EXCHANGER COIL

3. WINDER FANS

4. DRIFT ELIMINATORS

5. RECIRCULATION PUMP

6. WATER FILTRATION SYSTEM

7. WATER DISTRIBUTION SYSTEM

8. INSPECTION DOOR

9. SEALSKIN WATERTIGHT SYSTEM

10. LEVEL CONTROL

Construction Description of the parts

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2. HEAT EXCHANGER COIL The heat exchange coil of the NEK evaporative condenser is made in smooth steel piping of highest quality. The coil is arranged inclined in a steel frame to provide for free drainage of the internal fluid, and is TIG welded to the collectors before hot-dip galvanising in a discontinuous process for the whole assembly.

The design with smooth piping avoids the excessive lime deposits characteristic of finned coils, which dramatically reduce the performance of the heat exchanger.

The covering coat of FE/ZN alloy on the coil piping of the NEK condenser heat exchangers is approximately 100 microns, according to standard UNE-EN ISO 1461:2010. This standard is the highest available in the market.

The heat exchanger is subjected to a pressure test with dry air at 31 bar (submerged in a special pool), in this way ensuring the detection of possible leaks. This test is made before and after the hot-dip galvanizing process for reasons of safety and quality. The condenser is supplied loaded with nitrogen at 3 bar to be able to check the integrity of the coil when the unit is located in the installation.

The design and manufacture of the coil is carried out in conformity with the European Directive on pressure equipment (PED) 97/23/EC.

1. GFRP CASINGThe casing of the NEK evaporative condenser is manufactured entirely in fiber-reinforced polyester (GFRP), a material which gives the equipment practically unlimited durability due to its high chemical resistance to corrosive agents. GFRP is a dielectric material and therefore is excluded from cases of electrochemical corrosion.

GFRP has great mechanical resistance, with resistance to flexion at a value of 1300 kg/cm2 (standard ASTM, D-790). Its chemical and mechanical resistance and its inalterability mean that an installation made with this material will last indefinitely.

The specific weight of the material is 3.5 times less than that of carbon steel, although GFRP easily surpasses steel in specific resistance. For this reason the NEK evaporative condenser is

much lighter and more resistant than traditional condensers with steel cowling. Due to its reduced weight

the structure supporting the condenser can be minimized and assembly is considerably simplified. The casing surrounding the condenser is made in two parts. Both are manufactured in a single piece and without joints, to guarantee the fully watertight seal of the equipment. The water collection basin has rounded edges at the corners and a spacious design to make cleaning, inspection and maintenance of the evaporative condenser much easier.

Optionally the condenser casing can be made in different colours, to the customer’s choice, for criteria of architectural harmonization of the installation where the equipment is to be installed, or in line with aesthetic criteria (see schedule).

Construction Description of the parts

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3. WINDER FANSIn the NEK series the axial fans in standard production have asynchronous six pole motors which meet the IE3 efficiency levels of standard IEC 60034-30 (ERP ready 2015). These are three-phase motors with IP55 degree of protection and class “F” insulation (HV 80K), suitable for working with frequency shifters.

In NEK condenser fan the motor is coupled directly to the fan shaft and therefore with no transmission loss through a coupling. In consequence the useful life of the fan is much greater than in another with transmission, and needs no maintenance.

The ionized aluminium fan blades are of an innovative design and exclusive. As can be seen in the sketch below, the teeth are “sickle” shaped (A) which guarantees improvements in flow and pressure, there is also the “winglet” (B) at the extreme periphery of the teeth to eliminate turbulence and a toothed lip (C) on the discharge section which substantially reduces the noise level (SUPER SILENCE TECH). Advanced applications have been used in its design, such as the Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) systems.

The next graphic illustrates how a NEK evaporative condenser with WINDER blades requires less installed electrical power than another condenser with conventional fans. The combination of this special blade with the highly efficient IE3 motor results in a notable increase in fan performance and therefore a reduction of consumption of up to 20%, which means a significant saving in energy.

On the other hand, and as a consequence of the innovative design of the blade, the level of sound pressure of the fan is reduced by up to 5 db(A), making the NEK condenser an extremely versatile and perfectly balanced unit (lower power consumption and very reduced noise level).

If particularly low sound levels are required, condensers can optionally be supplied with 8 or 12 pole motors.

NEK evaporative condensers are of forced draft counter flow. In forced draft evaporative condensers the air is discharged at low speed from the upper part of the condenser. They are more efficient than induced flow equipments, as the dynamic pressure converted to static has a useful function. The moving air is cold air and therefore of greater density than in the case of induced flow, so that the fans will last much longer than when working with cold air unsaturated, which is less corrosive than the hot saturated output air.

A B

C

STAT

IC P

RESS

URE

MM

H20

AIR FLOW M3/H

7,5

5,5

WU

(KW

)

Construction Description of the parts Construction Description of the parts

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6. WATER FILTERING SYSTEM The filtering system for re-circulating water is located in the pump intake. The filter consists of two filter stages to protect effectively both the recirculation pump and the water pulverization system. The filter can be removed for easy cleaning and maintenance. All the parts are made in stainless steel.

7. WATER DISTRIBUTION SYSTEM The water distribution system of the condenser consists of two main parts.

The outer part is formed by the pump impulsion tube made in PVC. The special rubber expansion joint with high quality rotary flanges is installed inside it. This whole is supplied preassembled for easy installation.

The inner part is composed of a water collector in hot galvanized steel with pulverization branches in PVC and

VORTEXJET spray nozzles.

The VORTEXJET fine spray nozzles with a patented

central post design ensure an absolutely uniform distribution and optimum atomization of water, and for this reason rapid heat transfer and the effective shock of drops in suspension in the air. The spray nozzles have removable caps for easy cleaning and the parts have a long useful life.

8. INSPECTION DOORThe NEK evaporative condenser has one or several large size inspection doors made in stainless steel. The inspection door allows easy access to the interior of condenser for its inspection, cleaning and maintenance.

9. SEALSKIN WATERTIGHT SYSTEM V. 2.0.The NEK evaporative condenser incorporates the SEALSKIN watertight system which ensures that the installed equipment is absolutely watertight. The system consists of a single horizontal joint to fit the two parts (there are no vertical joints in any condenser in the range) and a joint specially designed for this purpose.

10. LEVEL CONTROL The standard NEK evaporative condenser is supplied with a mechanical device for control of the water level. Optionally it can be supplied with an electric water level control.

4. DRIFT ELIMINATORS The drift eliminators installed in NEK evaporative condensers are made in high quality PVC offering excellent resistance to ambient factors and inorganic chemical agents.

They are highly efficient separators (losses for start-up of less than 0.001% of re-circulated water) due to their geometry of 4 changes of air flow direction.

The drop separators are mounted on stainless steel frames of easy handling in the upper part of the condenser, simplifying the tasks of inspection and cleaning the equipment.

5. RECIRCULATION PUMP The NEK evaporative condenser is fited as standard with a recirculation pump of monoblock type. The pumps are energy efficient, reliable and meet standards EN733 and ISO2858.

The pumps installed on the NEK series have a great reputation at world level due to its high quality, advanced technology and high energy performance. The worldwide involvement ensures the availability of spares quickly and economically anywhere in the world.

The pump is a dry rotor pump in a monoblock design with flanged connection and is prepared for installation

in corrosive atmospheres.

The outside has been treated by cataphoresis, which consists of cathode electro-deposit and coating with zinc phosphate which ensures a long useful life for the component.

The directly coupled electric motor is three-phase type, closed with exterior ventilation and IP-55 protection for working outdoors.

1. Hydraulic system optimized in the hydraulic body and booster = liquid flow without obstructions.2. Closure with O-ring seal between the hydraulic body and the pump cover = no risk of leaks.3. Hydraulic body, booster and wear ring made with different materials = greater resistance to rust and without elements of adherence.4. Enclosed ball bearings = correct lubrication with no dust intrusion.

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The nominal capacity of the NEK condensers, indicated in this catalogue, is with ammonia (R717), for a condensation temperature of 40ºC and with air at 28ºC wet bulb temperature.The following tables give the correction factors of nominal capacity for other condensation and wet bulb temperatures. Table 1 is for R717 and Table 2 for R404A. For other fluids, please enquire from our technical department.

Table 1. Capacity correction factors for R717, depending on the condensation and wet bulb temperatures.

R717 ThºC18 19 20 21 22 23 24 25 26 27 28 29

TCºC

30 0,72 0,67 0,63 0,58 0,53 0,48 0,42 - - - - -

31 0,78 0,73 0,68 0,64 0,58 0,54 0,48 0,43 - - - -

32 0,84 0,80 0,75 0,70 0,65 0,60 0,55 0,50 0,44 - - -

33 0,91 0,87 0,82 0,78 0,72 0,67 0,62 0,57 0,51 0,46 0,40 -

34 0,98 0,94 0,89 0,85 0,79 0,74 0,69 0,64 0,58 0,53 0,47 0,42

35 1,06 1,02 0,97 0,93 0,87 0,82 0,77 0,72 0,66 0,61 0,55 0,50

36 1,15 1,10 1,06 1,01 0,95 0,90 0,85 0,80 0,75 0,69 0,64 0,58

37 1,23 1,18 1,14 1,09 1,04 0,98 0,94 0,89 0,83 0,78 0,72 0,67

38 1,32 1,27 1,23 1,18 1,13 1,07 1,03 0,98 0,92 0,87 0,82 0,76

39 1,41 1,36 1,32 1,27 1,22 1,16 1,12 1,07 1,02 0,96 0,91 0,85

40 1,50 1,45 1,41 1,36 1,32 1,26 1,21 1,17 1,11 1,05 1,00 0,95

41 1,60 1,55 1,51 1,46 1,41 1,36 1,31 1,26 1,21 1,15 1,10 1,05

42 1,69 1,65 1,60 1,56 1,51 1,46 1,41 1,36 1,31 1,25 1,20 1,14

43 1,78 1,75 1,70 1,65 1,61 1,56 1,51 1,46 1,41 1,35 1,30 1,25

44 - - 1,80 1,75 1,71 1,66 1,61 1,56 1,51 1,46 1,41 1,36

45 - - - - 1,82 1,76 1,72 1,66 1,61 1,56 1,51 1,46

Tc = Temperature corresponding to refrigerant pressure in the intake collector in ºC Th = Temperature of ambient air wet bulb in ºC

• Multiple independent circuits in the heat exchanger coil, for both condensation and oil cooling.• Heat exchange coil entirely made in stainless steel, either AISI 304L or AISI 316L.• Heat exchange coils designed and made according to the ASME code.• Heating element installed in the recirculation water basin to prevent the formation of ice in it. The system incorporates a thermostat and control of minimum water level.• Electronic level control instead of the mechanical float valve (with level switch constructed in stainless steel AISI 316L).• Fans with 8 or 12 pole motors.• Fans with IE4 motors (W22 Super Premium).• Special windings in the motors for different voltages. • Fan casing, motor support, protection grille and screws all in stainless steel.• Frequency shifter to regulate the speed of the EOSCONTROL motors.• Mechanical system with overpressure hatches for control of capacity.• Reserve pump mounted with retention valve.• Colour can be personalized.• Signalling lights.• Perimeter ladder and walkways for maintenance.

WE HAVE NUMEROUS

OPTIONAL EXTRAS

SUCH AS:

ACCESSORIESEVAPORATIVE CONDENSER

SELECTIONOF THE CONDENSER

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Selection of the Condenser

NEK Model 350 400 450 550 650 750 850 950

Nominal Capacity • kW(1) 350 400 450 550 650 750 850 950

Input Power • kW(2) 5,1 6,2 7,9 7,9 8,7 8,7 11,0 14,3

Air Flow • m3/h 25600 25900 25300 32900 47200 52600 53600 52800

Sound Pressure • dB(A)(3) 57 58 59 59 60 60 61 62

Re-circulated Water • m3/h 29 27 26 35 45 53 51 51

Height (A) • mm 3380 3580 3780 3580 3380 3380 3580 3780

Length (B) • mm 1700 1700 1700 2200 3150 3150 3150 3150

Fan Width (C) • mm 560 580 600 600 560 560 580 600

Fans • nº(4) 1 1 1 1 2 2 2 2

Fan Power • kW/u 3 4 5,5 5,5 3 3 4 5,5

Pump Power • kW 1,1 1,1 1,1 1,1 1,1 1,1 1,1 1,1

Gas Intake • ” 2 1/2 2 1/2 2 1/2 2 1/2 3 3 3 3

Liquid Outlet • ” 2 2 2 2 2 1/2 2 1/2 2 1/2 2 1/2

Internal Volume • dm3 220 270 330 370 370 450 560 670

Weight Empty • kg 1600 1600 1800 2000 2500 2800 3100 3500

Weight Loaded • kg(5) 2900 2900 3100 3100 4900 5200 5500 6000

B

A

1850

NEK: 350/400/450/550

B

A

1850

NEK: 650/750/850/950

(1) Refrigerant R717 (NH3). Condensation temperature 40ºC. Wet bulb temperature 28ºC.(2) Total power absorbed by the fans and the water recirculation pump.(3) Sound pressure level at 10 metres distance, in free field, according to EN 13487 (parallelepiped surface).(4) Fan diameter 1000 mm. motors 230/400V-3-50Hz and 400/690-3-50 Hz, IP55, Class F.(5) Approximate weight of the condenser with refrigerant and water basin loaded.

Table 2. Capacity correction factors for R404A, depending on the condensation and wet bulb temperatures.

• Refrigerant fluid: R717 • Potential to dissipate in the condenser: 900 kW • Condensation temperature: 35ºC • Wet bulb temperature: 26 ºC Table 1 gives us the temperature factor: 0.66. The nominal capacity required is obtained by dividing the capacity to dissipate by the above temperature factor:

With this nominal capacity calculated, we look in the table of characteristics for the condenser which comes closest, above, to that capacity.In this example, condenser NEK-1400, with a nominal capacity of 1400 kW, is the one selected.

R404AThºC

18 19 20 21 22 23 24 25 26 27 28 29

TCºC

30 0,63 0,58 0,55 0,50 0,46 0,42 0,37 - - - - -

31 0,68 0,64 0,59 0,56 0,50 0,47 0,42 0,37 - - - -

32 0,73 0,70 0,65 0,61 0,57 0,52 0,48 0,44 0,38 - - -

33 0,79 0,76 0,71 0,68 0,63 0,58 0,54 0,50 0,44 0,40 0,35 -

34 0,85 0,82 0,77 0,74 0,69 0,64 0,60 0,56 0,50 0,46 0,41 0,37

35 0,92 0,89 0,84 0,81 0,76 0,71 0,67 0,63 0,57 0,53 0,48 0,44

36 1,00 0,96 0,92 0,88 0,83 0,78 0,74 0,70 0,65 0,60 0,56 0,50

37 1,07 1,03 0,99 0,95 0,90 0,85 0,82 0,77 0,72 0,68 0,63 0,58

38 1,15 1,10 1,07 1,03 0,98 0,93 0,90 0,85 0,80 0,76 0,71 0,66

39 1,23 1,18 1,15 1,10 1,06 1,01 0,97 0,93 0,89 0,84 0,79 0,74

40 1,31 1,26 1,23 1,18 1,15 1,10 1,05 1,02 0,97 0,91 0,87 0,83

41 1,39 1,35 1,31 1,27 1,23 1,18 1,14 1,10 1,05 1,00 0,96 0,91

42 1,47 1,44 1,39 1,36 1,31 1,27 1,23 1,18 1,14 1,09 1,04 0,99

43 1,55 1,52 1,48 1,44 1,40 1,36 1,31 1,27 1,23 1,17 1,13 1,09

44 - - 1,57 1,52 1,49 1,44 1,40 1,36 1,31 1,27 1,23 1,18

45 - - - - 1,58 1,53 1,50 1,44 1,40 1,36 1,31 1,27

SELECTION EXAMPLE:

1700 C

Tc = Temperature corresponding to refrigerant pressure in the intake collector in ºCTh = Temperature of ambient air wet bulb in ºC

SPECIFICATIONTECHNICAL INFORMATION AND DIMENSIONS

Q nominal = 900 / 0.66 = 1363.63 kW

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Specification Technical Information and DimensionsSpecification Technical Information and Dimensions

NEK Model 2800 3300 3800

Nominal Capacity • kW(1) 2800 3300 3800

Input Power • kW(2) 43,8 45,3 58,5

Air Flow • m3/h 169800 228000 227200

Sound Pressure • dB(A)(3) 67 67 68

Re-circulated Water • m3/h 172 230 226

Height (A) • mm 3780 3580 3780

Length (B) • mm 9200 12100 12100

Fan Width (C) • mm 600 580 600

Fans • nº(4) 6 8 8

Fan Power • kW/u 5,5 4 5,5

Pump Power • kW 2x2,2 2x3 2x3

Gas Intake • ” 4x3 4x4 4x4

Liquid Outlet • ” 4x2 1/2 4x3 4x3

Internal Volume • dm3 2740 3060 3680

Weight Empty • kg 10200 12400 13600

Weight Loaded • kg(5) 17600 22000 23400

NEK: 2800

NEK: 3300/3800

(1) Refrigerant R717 (NH3).

Condensation temperature 40ºC.

Wet bulb temperature 28ºC.

(2) Total power absorbed

by the fans and the water

recirculation pump.

(3) Sound pressure level at

10 metres distance, in free

field, according to EN 13487

(parallelepiped surface).

(4) Fan diameter 1000 mm.

motors 230/400V-3-50Hz and

400/690-3-50 Hz, IP55, Class F.

(5) Approximate weight of the

condenser with refrigerant

and water basin loaded.

NEK Model 1050 1200 1400 1650 1900 2150 2400

Nominal Capacity • kW(1) 1050 1200 1400 1650 1900 2150 2400

Input Power • kW(2) 13,5 17,0 21,9 22,6 29,2 28,5 36,7

Air Flow • m3/h 82800 85200 84900 114000 113600 143000 142500

Sound Pressure • dB(A)(3) 62 63 64 64 65 65 66

Re-circulated Water • m3/h 90 87 86 115 113 146 144

Height (A) • mm 3380 3580 3780 3580 3780 3580 3780

Length (B) • mm 4600 4600 4600 6050 6050 7500 7500

Fan Width (C) • mm 560 580 600 580 600 580 600

Fans • nº(4) 3 3 3 4 4 5 5

Fan Power • kW/u 3 4 5,5 4 5,5 4 5,5

Pump Power • kW 2,2 2,2 2,2 3 3 4 4

Gas Intake • ” 2x3 2x3 2x3 2x4 2x4 2x4 2x4

Liquid Outlet • ” 2x2 1/2 2x2 1/2 2x2 1/2 2x3 2x3 2x3 2x3

Internal Volume • dm3 920 1150 1370 1530 1840 1920 2300

Weight Empty • kg 4100 4600 5100 6200 6800 7700 8400

Weight Loaded • kg(5) 7700 8300 8800 11000 11700 13600 14500

NEK: 1050/1200/1400

NEK: 1650/1900 NEK: 2150/2400

B

A

1850

B

A

1850

B

A

1850

1700 C

B

B

AA

1850

1850

1700

1700

C

C

1700 C

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Specification Technical Information and Dimensions

RAL 7040Window Grey

RAL 5014Pigeon Blue

RAL 5024Pastel Blue

RAL 7016Anthracite Grey

RAL 6000Patina Green

RAL 6021Pale Green

RAL 3020Traffic Red

RAL 9010Pure White

RAL 8023Orange Brown

NEK Model 4300 4800

Nominal Capacity • kW(1) 4300 4800

Input Power • kW(2) 56,9 73,4

Air Flow • m3/h 286000 285000

Sound Pressure • dB(A)(3) 68 69

Re-circulated Water • m3/h 292 288

Height (A) • mm 3580 3780

Length (B) • mm 15000 15000

Fan Width (C) • mm 580 600

Fans • nº(4) 10 10

Fan Power • kW/u 4 5,5

Pump Power • kW 2x4 2x4

Gas Intake • ” 4x4 4x4

Liquid Outlet • ” 4x3 4x3

Internal Volume • dm3 3840 4600

Weight Empty • kg 15400 16800

Weight Loaded • kg(5) 27200 29000

NEK: 4300/4800

A

1850

B 1700 C

SCHEDULE COLOUR CATALOGUE

RAL 5012Light Blue

RAL 6018Yellow Green

RAL 2000Yellow Orange

(1) Refrigerant R717 (NH3).

Condensation temperature 40ºC.

Wet bulb temperature 28ºC.

(2) Total power absorbed

by the fans and the water

recirculation pump.

(3) Sound pressure level at

10 metres distance, in free

field, according to EN 13487

(parallelepiped surface).

(4) Fan diameter 1000 mm.

motors 230/400V-3-50Hz and

400/690-3-50 Hz, IP55, Class F.

(5) Approximate weight of the

condenser with refrigerant

and water basin loaded.

Construction Description of the parts

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EOS Refrigeration Equipment, S.L.Pol. Almeda · Treball 21-23

08940 Cornellà de Llobregat (Barcelona), SPAIN

Tel. +34 934 709 093www.eosrefrigeration.com