NECH is one of the common type of evaporative condensers, which is characterized by its mixed flow heat transfer ( the vertical cross flow direction of air and refrigerant steam). This design allows the air flow evenly through the condenser, higher heat exchange efficiency.
Advantages
· Mixed flow heat transfer, Higher condensation efficiency.
The vertical cross flow direction of air and refrigerant steam , to make sure the air flow evenly through the condenser, efficient heat transfer.
· Secondary heat transfer, improving cooling efficiency.
Spray water flows through the condenser coil and first heat exchange with the coil, then flows though the lower part ( PVC heat exchange layer) and secondary heat transfer, last falls into the water collection basin for recycling. This process further improving cooling efficiency.
· Closed circuit system, Energy saving and Environmental protection
The Gaseous state Refrigerant is condensing and closed circulation in the coil , Keep clean, reduce water consumption and maintenance cost, longer equipment service life.
· Compact structure design, High Strength and Convenient
Small occupation area, Convenient to the shipment, Ease of installation and maintenance.
When NECH evaporative condenser is in operation:
The condensing coil is the main channel of refrigerant steam, which condenses the refrigerant steam into liquid by the way of evaporating and absorbing heat by spraying water. Spray water flow through coil unit and then into PVC heat exchange, going on secondary heat transfer. At the same time, the axial flow fan provides power, causing the air to form a cross flow inside the condenser and exchange heat with the refrigerant steam, so that to achieve efficient condensation performance.
| Series | Type | Capacity | Fan Drive System | Condensation | Secondary Heat Transfer |
| NECH | Mixed Flow | Range | Axial Flow fans | Condensing coil | PVC heat exchange layer |
| Allows the air flow evenly through the condenser. | 240~2000kw | Provides power, causing the air to form a cross flow inside the condenser and exchange heat with the refrigerant steam. | The main channel of refrigerant steam. | Spray water flow into PVC layer and secondary heat transfer. | |
| Mixed flow heat exchange, Closed circuit system |
High efficiency, Energy-saving and Environmental protection | ||||
| Application | Refrigeration, Air conditioning, Chemical industry, Medicine, Food and other fields. Especially in situations with limited space or requiring efficient and compact heat transfer equipment. |
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Axial Flow Fan
Adopts cooling tower special aluminum alloy axial flow fan,forward type blade structure design, small wind resistance, big air volume, low noise, good performance, high efficiency. Streamline high strength fan stack ensures airflow uniform through the fan inlet and outlet area, maximum reduce the energy consumption. Fan motor's protection class: IP55, Insulation class: F class.
Drift Eliminator
Adopts NEWIN made MBD series drift eliminator, advanced self-extinguishing PVC material, the sheet surface of the sheet is vertical grain texture design, improve the strength of the product, glued into block, strong load-bearing capacity, small wind resistant and effectively remove the exhaust air flow entrained water droplets, maximum drift capture and recovery 99.99%.
Water Distribution System
Spray system adopts SPJT pressure type nozzles, provide a fine and dense liquid mist under the pressure action of water pump, large spray area and evenly distribution.
Condensing Coil
Adopts 304 stainless steel coil, high anti-corrosion. Special coil set design, improving heat transfer performance. * Coil materials: SUS 304/316, Copper or Galvanized steel for option.
PVC Heat Exchanger Layer
Adopts NEWIN made MAH series fill film, advanced self-extinguishing PVC material, special texture design, provide sufficient heat exchange surface area, fill with grille and water receiving edge, reduce the loss of drift water, ensure high heat transfer efficiency.* Fill film materials could be upgraded to high-temp resistant materials.
Air Inlet Louver
HDGS material air inlet louver makes air flow evenly into equipment, reduce noise ans prevent the packing from exposure, maintenance-free.
Heavy-duty Construction
Modular structure, adopt the high quality of Z700 galvanized anti-corrosion plates, strong corrosion resistant NWN-Armour plate or SUS 304/316 plate for option.
About NWN-Armour plate
That is the galvanized steel panel with NWN-Armour anti-corrosion coating have excellent resistance and corrosion resistance approaching the characteristics of stainless steel. A cost-effective alternative to Stainless Steel 304.
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Options |
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► Noise reduction upgrade |
►Anti-Freeze heater |
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►Vibration isolator |
►Stainless steel casing and framework / bolts and nuts (304 / 316) |
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►High-temperature upgrade |
►Dual-speed Motor & VFD motor |
Table1.Technical Specification
| Item | Heat Rejection Capacity | Dimension (mm) | Axial Fan | Spray Pump | NH3 Ammonia Charge | Operating Weight | ||||
| Model | (KW) | Length | Width | Height | Air Volume (m³/h) | Power (Kw)x Qty | Flow (m³/h) | Power (Kw) | (kg) | (kg) |
| NECH-240 | 240 | 2500 | 1970 | 2263 | 32000 | 1.1*2 | 32.5 | 1.5 | 25 | 3050 |
| NECH-320 | 320 | 2500 | 1970 | 2263 | 32000 | 1.1*2 | 32.5 | 1.5 | 37 | 3360 |
| NECH-400 | 400 | 3100 | 1970 | 2395 | 48000 | 1.1*3 | 45 | 2.2 | 39 | 3680 |
| NECH-480 | 480 | 3100 | 1970 | 2395 | 48000 | 1.1*3 | 45 | 2.2 | 48 | 4050 |
| NECH-560 | 560 | 3100 | 1970 | 2890 | 48000 | 1.1*3 | 58 | 2.2 | 60 | 4980 |
| NECH-640 | 640 | 3100 | 1970 | 2890 | 48000 | 1.1*3 | 58 | 2.2 | 71 | 5180 |
| NECH-800 | 800 | 3100 | 1970 | 2890 | 48000 | 1.1*3 | 58 | 2.2 | 83 | 6200 |
| NECH-1000 | 1000 | 3840 | 2340 | 3120 | 64000 | 1.1*4 | 89 | 4 | 98 | 7610 |
| NECH-1200 | 1200 | 4350 | 2340 | 3645 | 80000 | 1.5*4 | 100 | 5.5 | 110 | 10250 |
| NECH-1400 | 1400 | 4350 | 2340 | 3645 | 80000 | 1.5*4 | 130 | 5.5 | 158 | 11230 |
| NECH-1600 | 1600 | 4350 | 2340 | 3645 | 80000 | 1.5*4 | 130 | 5.5 | 161 | 13200 |
| NECH-2000 | 2000 | 5630 | 2340 | 3890 | 120000 | 2.2*4 | 172 | 7.5 | 197 | 14730 |
Table 2. Heat Emission Correction Index for R717
| Condensing Temp. (°C) | Air Inlet Wet Bulb Temp. (°C) | ||||||||||||
| 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
| 30 | 1.4 | 1.51 | 1.63 | 1.79 | 1.99 | 2.24 | 2.56 | 3 | |||||
| 32 | 1.18 | 1.25 | 1.32 | 1.43 | 1.55 | 1.7 | 1.88 | 2.11 | |||||
| 34 | 1.02 | 1.07 | 1.12 | 1.19 | 1.28 | 1.36 | 1.48 | 1.61 | 1.8 | 2.06 | |||
| 35 | 0.95 | 0.99 | 1.03 | 1.08 | 1.15 | 1.23 | 1.3 | 1.39 | 1.53 | 1.69 | 1.9 | 2.15 | 2.47 |
| 36 | 0.89 | 0.92 | 0.96 | 1.01 | 1.07 | 1.13 | 1.2 | 1.28 | 1.39 | 1.53 | 1.7 | 1.91 | 2.17 |
| 38 | 0.78 | 0.81 | 0.83 | 0.86 | 0.9 | 0.94 | 0.99 | 1.05 | 1.12 | 1.21 | 1.31 | 1.44 | 1.59 |
| 40 | 0.7 | 0.72 | 0.74 | 0.76 | 0.8 | 0.83 | 0.87 | 0.91 | 0.96 | 1.02 | 1.09 | 1.18 | 1.29 |
| 42 | 0.63 | 0.64 | 0.66 | 0.68 | 0.71 | 0.74 | 0.76 | 0.8 | 0.84 | 0.88 | 0.93 | 0.99 | 1.06 |
| 44 | 0.56 | 0.58 | 0.59 | 0.61 | 0.63 | 0.65 | 0.67 | 0.7 | 0.76 | 0.76 | 0.79 | 0.83 | 0.86 |
Table 3. Heat Emission Correction Index for R22 &R134a
| Condensing Temp. (°C) | Air Inlet Wet Bulb Temp. (°C) | |||||||||||||
| 10 | 12 | 14 | 16 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 28 | |
| 29 | 0.86 | 0.94 | 1.03 | 1.15 | 1.37 | 1.43 | 1.55 | 1.68 | 1.92 | 2.1 | 2.52 | 3.1 | ||
| 31 | 0.77 | 0.83 | 0.9 | 0.99 | 1.1 | 1.17 | 1.24 | 1.34 | 1.47 | 1.62 | 1.83 | 2.1 | 2.48 | |
| 33 | 0.69 | 0.73 | 0.79 | 0.86 | 0.94 | 1 | 1.02 | 1.1 | 1.2 | 1.28 | 1.4 | 1.56 | 1.75 | 2.38 |
| 35 | 0.62 | 0.66 | 0.7 | 0.76 | 0.83 | 0.86 | 0.9 | 0.93 | 1 | 1.07 | 1.18 | 1.25 | 1.38 | 1.68 |
| 37 | 0.57 | 0.6 | 0.63 | 0.67 | 0.72 | 0.76 | 0.78 | 0.82 | 0.85 | 0.9 | 0.96 | 1.02 | 1.1 | 1.3 |
| 39 | 0.55 | 0.57 | 0.59 | 0.62 | 0.65 | 0.68 | 0.7 | 0.72 | 0.75 | 0.79 | 0.84 | 0.88 | 0.95 | 1.1 |
| 41 | 0.48 | 0.49 | 0.52 | 0.54 | 0.57 | 0.59 | 0.61 | 0.63 | 0.66 | 0.68 | 0.71 | 0.75 | 0.78 | 0.9 |
| 43 | 0.44 | 0.46 | 0.48 | 0.5 | 0.52 | 0.54 | 0.55 | 0.57 | 0.59 | 0.61 | 0.63 | 0.66 | 0.68 | 0.75 |
| 45 | 0.41 | 0.42 | 0.44 | 0.46 | 0.48 | 0.49 | 0.5 | 0.52 | 0.53 | 0.55 | 0.56 | 0.58 | 0.61 | 0.66 |
Instructions for Selection
1. Confirm condensing temperature, wet bulb temperature.
2. Calculate total heat abstraction amount that goes through system to condensers.
3. Take a reference to below Table 2. or Table 3., select heat abstraction amount correction index.
4. Total amount of heat abstraction multiplies heat correction index equals to the condensing load during the working conditions.
5. Take a reference to Graph Specification sheet, select the heat abstraction amount data which is bigger or equivalent tothe data after correction.
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