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The dust-free workshop refrigeration program should be based on the supply of water supply (consuming, cooling method, refrigeration water temperature, etc.), the water source (water temperature, water, water, water volume, etc.) and power supply and heat source preparations. There is a good economic indicator, and it is necessary to consider local possibilities. Jin Cheng Xiaobian explains:
The selection of the refrigeration device is the central link in the refrigeration scheme determination process, and the main types of the refrigeration device are as follows.
1, compression refrigeration device
The compression refrigeration device includes three types of piston (reciprocating), centrifugal and screw type.
The main equipment of the piston (reciprocated) compression refrigeration device is a piston refrigeration compressor, a commonly used liquid ferric (NH3), fluorolon-12, 22 (f-12, 22). Such equipment is driven, easy to use, more variety, product all, can meet the requirements of all kinds of air-conditioning supply, are widely used. However, the investment is large, the equipment cost is high, the power consumption is large, and the maintenance management is more complicated.
The main equipment of the centrifugal compression refrigeration device is a centrifugal refrigeration compressor, and the commonly used process is fluorofon-11, 113, 114 (F-11, 113, 114). The machine is the same as the principle of the piston refrigeration compressor, but it only has a rotary motion, stable than the piston operation, small vibration, less mechanical, and is common to the evaporator, the condenser combination, and the equipment is smaller. Such equipment is selected only when the centrifugal refrigeration compressor is large, so this type of equipment is only used when the air conditioner is consuming.
The primary equipment of the screw compressed refrigeration device is a screw refrigeration compressor, a commonly used process, a fluoron-12, 22, ammonia (F-12, 22, R717). Currently produced screw refrigeration compressors compared to piston, although the efficiency is slightly low, due to its simple structure, small size, high intake coefficient, low exhaust temperature, and large single compression, not sensitive to wet strokes. The exhaust gas is small, the elimination member is less, the column is long, and the cooling capacity can be adjusted. It is widely used in various refrigeration devices. This machine has a better technical economic indicator in a refrigeration device in the (120-800) x105kj\h capacity range.
2, absorption refrigeration device
Absorption refrigeration unit utilizes thermal energy cooling. Common ammonia-aqueous absorbent refrigeration devices and water-bromide aqueous solution absorption refrigeration units. The former is suitable for low temperature freezing; the latter is suitable for air conditioning cooling, and the air conditioner or process for air conditioning or process is used. The water of the brominated absorption refrigeration is a working article, and the lithium bromide solution is an absorbent. Its advantages are as follows.
The pressure of the steam heat source has great adaptability. When the vapor pressure is 0.02-0.1 MPa, a monochromatic absorption refrigerator can be employed. When the vapor pressure is 6.0-1.0 MPa, a dual efficiencellular refrigerator can be used.
Secondly, the device is simple, basically a combination of the heat exchanger, easy to manufacture, except for small power shielding pumps, outside the vacuum pump, no moving parts, therefore the vibration is small, the operation is smooth, the equipment is working, the work is ignorant, no Poison, harmless to people, safe use, easy to manage automation, automatic equipment operation, cooling capacity can be automatically adjusted within 10% to 100%; the water temperature of cooling water is adapted, even if it reaches 37 ~ 38 ° C, The equipment can still work properly; saving electric energy, single-machine cooling amount, the power consumption of the lithium bromide refrigerator is only about 5% of the compression refrigerator, which is very suitable for the pool of heat sources. However, lithium bromide absorption refrigeration also has the limitations of disadvantages and use, mainly the lithium bromide solution is strongly corrosive in contact with air, and once corrosion, not only affects heat transfer effect, but also causes life, and can cause The equipment is damaged, so the equipment must be strictly sealed, and it is also necessary to pay attention in operation management.
3, steam injection refrigeration device
The steam spray refrigeration device is also a device that is refrigerated by thermal energy, with water as a refrigerant, which is refrigerating power. The pressure of steam is 0.2-0.8MPa, its main advantages are: equipment is working under vacuum, except for pumps, no rotation parts; refrigerant is water, it is harmless, safe, easy to use; easy to manufacture, easy manufacturing, General machinery factory or mechanical workshop can be manufactured; the equipment is small invested, and it can be installed outdoor, saving civil construction costs; can use the heat of heat or industrial enterprises in industrial enterprises, heat heating, winter heat, summer steam .
The main disadvantage of steam jet refrigeration is that the efficiency is low, and the special boiler and the use of small heating boilers are not economical. When the frozen water temperature can be employed at 5 ° C or more, it is more economical when 100 ° C or above. The efficiency changes with the temperature of the frozen water, the lower the cryogenic temperature, the greater the amount of steam, the lower the efficiency. Further, the cooling water is very large, and the cooling water required for the steam spray refrigerator is about 1.5 times the compression or brominated absorption, which is not suitable for the area of water source.
Jiangsu Jincheng Air Conditioning Engineering Co., Ltd.
Industrial air conditioning, chemical fiber industrial air conditioning, chemical fiber industry refrigeration, textile industrial air conditioning, dust-free workshop cooling, ventilation pipeline, cooling tower, freezer and other air conditioning units and accessories.
