A chiller is an energy-saving machine that achieves refrigeration by steam compression or absorption cycles. The chiller is called the cooling water circulation machine, also called the chiller, the chiller, the chiller, the chiller, the chiller, the small chiller, the industrial chiller, the refrigeration unit, the low temperature chiller, the laser chiller, because of the wide range of industries. Use, so according to different industries, its aliases are countless. Our company mainly produces air-cooled chillers, water-cooled chillers, screw chillers and filling line industrial chillers.
(1) The initial investment of air-cooled units is lower than the initial investment of water-cooled units, but the unit cooling capacity is slightly higher than that of water-cooled units, but the annual comprehensive cost of air-cooled units is basically the same as or slightly lower than that of water-cooled units.
(2) From the operation point of view, only when the unit's annual running time is very long, it is possible for the water-cooled unit to slowly recover the higher part of the investment later.
(3) The amount of cooling water in the water cooling unit is an important factor affecting its cost. Strengthening maintenance management and reducing water consumption are important aspects of reducing the cost of water-cooled units.
1. The air-cooled refrigeration unit is suitable for medium and small systems with tight water sources in the region; the longer the annual operating hours, the more favorable the air-cooled refrigeration unit is; the annual comprehensive cost of the air-cooled refrigeration unit is lower than that of the water-cooled system. However, if the water cooling system is managed and the water supply is controlled below 3%, the initial investment of the air-cooled refrigeration unit compared with the water-cooled refrigeration unit is difficult to recover.
Second, the technical and economic comparison of the two units 2.1 Description Considering that the number of air-cooled condensers of large refrigeration units is too large, it is usually difficult to arrange. On the other hand, too small water-cooled refrigeration units are not conducive to use, so it is moderately easy. The air-cooled unit is compared with the same amount of cold water-cooled refrigeration unit.
2.2 Initial investment of the unit 2.2.1 The initial investment of the unit includes equipment cost, installation fee and electricity expansion fee;
Now compare a certain type of water-cooled refrigeration unit with the same air-cooled refrigeration unit with main unit and evaporator.
The annual operating time of the compressor is 1000 hours to 3000 hours, and the annual running time of the cooling tower and the pump is 1400 hours to 4200 hours.
2.3.1 Operation cost of air-cooled refrigeration unit Annual power consumption of air-cooled refrigeration unit = (compressor power consumption + fan power consumption) × operation time / year × electricity price 2.3.2 Operation cost of water-cooled refrigeration unit 2.3.2.1 Annual power consumption of water-cooled refrigeration unit = (compressor power consumption + cooling tower fan power consumption + cooling water pump power consumption) × running time / year × electricity price 2.3.2.2 water-cooled refrigeration unit annual water fee = (total circulating water × Water change times + water supply × total circulating water × running time / year) × water price III. Conclusion 3.1. The amount of cooling water in the water cooling unit is an important factor affecting its cost. Strengthening maintenance management and reducing water consumption are important aspects of reducing the cost of water-cooled units.
3.2. The initial investment of air-cooled refrigeration unit is higher, and the power consumption per unit cooling capacity is also slightly higher than that of water-cooled unit. However, the annual comprehensive cost of air-cooled unit is slightly lower than that of water-cooled unit. The technical and economic analysis results show that it is reasonable to configure air-cooled condensers for medium and small chillers.
3.3. The longer the annual running time of the chiller, the more favorable it is to the air-cooled unit. The initial investment recovery period of the air-cooled unit compared with the water-cooled unit is shorter. Therefore, the chillers used for air conditioners in the south are more suitable for air-cooled units. From the cooling conditions, the wet bulb temperature in the south is high, which is also unfavorable for water-cooled units.
Chiller application industry:
The chiller is mainly used in the plastics industry: plastic molding, injection molding, extrusion molding, blowing, thermoforming, machinery industry: laser technology, welding, mechanical cutting, non-cutting, casting, electroplating, electronics industry: surface treatment, electroplating , electrophoresis, medical equipment, electronics industry, circuit board production, electronic chip manufacturing, chemical industry and other industries: chemical, paper, pharmaceutical, food processing, aluminum profiles, aluminum alloys, tempered glass, coated glass production, ultrasonic cleaning冼, jewelry processing, leather, fur processing, ink production, aquaculture.

Trauma Cannulated Screw

Cannulated screw is a common internal fixation device in orthopedic surgery.

Working process

During the operation, the Kirschner wire with the hole matching the hollow screw is first drilled into the bone of the fracture site, and then the hollow screw is screwed into the fracture site through the guidance of the Kirschner wire. Finally, the Kirschner wire is pulled out to complete the fixation of the fracture site. In many cases of fracture of the neck and femur, the healing cycle is long, and it usually takes about 30 months to remove the cannulated screws. At this point, the bone and the surface of the cannulated nail are closely connected and firmly connected in the nail path, which leads to defects easily generated by conventional nail removal methods, causing secondary injury at the fracture healing site and causing pain to the patient. Percutaneous cannulated screw internal fixation for femoral neck fractures has the advantages of small trauma, good healing, low rate of femoral head necrosis, and good stability.

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