NAFA AGRICULTURE

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 PRODUCTS & SERVICES

Greenhouses

The greenhouses is a special construction covered by fiberglass or plastic transparent films in which artificial climate can be created to meet ideal needs of the plants all through the year.

Ideal climate could be created in summer by using the cooling system which consist of cooling pads and fans and in winter by using the heaters. All the operations are controlled by automatic system. Irrigation of the crop is done through an automatic drip irrigation net, through which fertilizers can be applied.

NAFA Engineering Products Factory manufacture the following models of green houses:-

Greenhouses Cover

NAFA provides different kinds of covers for the green houses, according to the customer requirements.

1.  Polyethylene foil for un-cooled green houses U.V. stabilizer.

2.  Polyethylene foil for cool green houses U.V. stabilizer.

3.  Fiber Glass.

Technical Data:

• presence of longit. nylon threads approx. every 12 mm

• specific gravity: gr/cm³ 1.40 (D 792)

• light transmission: 87%

• health transmission - coeff. K = 5 ca. Kcal/m² h°C approx.

• resistance at temperatures: from -40 to +140°C

• thermal conductivity - coeff. λ:0.22 Kcal/m h°C (1.56 BTU/HR Ft²) (C-177)

• tensile strength: Kg/cm²

• compression resistance: Kg/cm² 2200 (D-695)

• flexural moduls: Kg/cm² 61000 (D-790)

• flexural strength: Kg/cm² 1400 (D-790)

• dielectric rigidity: KV/mm 31.5 (D-149)

• dissipation factor: 0.025 (D-150)

• dielectric constant: 3.5 (D-150)

• coefficient linear thermal expansion: 2.7 x 10‾5 cm/cm° (D-696)

• water absorption: mg/cm² 0.18 ÷ 0.25% (D-570)

• Rockwell hardness: E 91 (D-785)

• flash ignition temperature: 404.4°C (D-1929)

• self-ignition temperature: 487.8°C (D-1929)

• flammability (material nom. T.150) <6.4 cm/min. (D-635)

• spectral transmission UV: 19,6%

• spectral transmission IR: 86,6%

• spectral transmission (visible range - new material): 89.4% (E-124 "A")

• total solar energy transmitted (new material): 85.7% (E-124 "A")

• point of vitrification: -42°C

• waviness factor: 12% (i.e.: 1 m. projection = to approx. 1.14 m. development)

• bending and camber of sheets: the more long the sheets are, the more they can be bended, with particular expedients: L76/18 up to a min. 3 m. radius,  L32/9 up to a min. 1 m. radius

The method between brackets corresponds to ASTM specs. All values are only approximate (nominal) and subject to usual production variables, due to the fact that FILON panel is a composite material.

RWA - The ideal humidifier for a cool environment:

The RWA pulverizes the air by means of centrifugal force created by a rotating disc. It functions with all types of water and is not obstructed by impurities or minerals. Water which is not pulverized becomes automatically recycled.

Technical Features

NAFA FANS

NAFA exhaust fans has a distinguished designation of the blower blades and automatic operational system.

Fan specifications:

NAFA FAN 50

Available in three different sizes 30, 36, 50 inches. Motorizations will be from 0,5HP - 1,5HP. The fans are characterized by opening/closing system of the shutters by means of a revolutionary centrifugal system. This is called Omega System.

Fan Specifications:

• Dimension 1378 x 1378cm x 40
• Heavy duty motor desert-like circumstances 1,5HP - 3 phase
• Blower blades = 6
• Shutter blades automatically operated by Omega Centrifugal System
• Air flow - 40000 - 44000 cubic meter

Performance Data:

The Omega concept permits the fans high est air displacement with lowest energy uptake. Performance data are as following:

 

Model w	Static Pressure Pa	Air Displacement m³/h	Absorbed Power W	Specific Power W/1000 m³/h
w 50/1.5	0 -20 -40	40500 35700 31850	1370 1451 1551	33.82 40.64 48.70
w 50/1	0 -20 -40	34600 31400 27300	960 1020 1080	27.75 32.48 39.56
w 36/0.75	0 -20 -40	21370 20000 18125	890 935 970	41.65 46.75 53.51
w 36/0.5	0 -20 -40	18700 17300 15470	650 625 596	31.87 36.13 42.02
w 30/0.75	0 -20 -40	17190 16200 14750	771 810 840	44.85 50.00 56.95
w 30/0.5	0 -20 -40	15350 14350 12900	575 602 626	37.46 41.95 48.52

  System in Detail

Exhaust fans for agriculltural and industrial application	Advanced Technology Ventillation

CELdek® 7090-15 Evaporative Cooling Pad

CELdck® 7090-15 evaporative cooling pad is used in systems where high efficiency cooling is required. It can be used for many different cooling purposes but is particularly suitable for cooling of live stock buildings and greenhouses.

The Green stripe pad consists of specially impregnated and corrugated cellulose paper sheets with different flute angles, one steep (60 deg) and one flat (30 deg) that have been bonded together. This unique design yields a cooling pad with a high evaporation efficiency while still operating with a very low pressure drip. In addition scaling is kept to a minimum and no water carry-over occurs due to the fact that the water is directed to the air inlet side of the pad. This is where most of the evaporation takes place.

Equipment

• High evaporation efficiency
• Superb wetting properties
• Low pressure drop when wet, leading to lower operating costs
• No water carry-over
• Low scaling
• Self cleaning
• Strong and self supporting
• Long life time
• Low running costs
• Quick and easy to install
• Environmentally friendly
• Consistent high quality