What are the types of refrigeration devices in dust-free workshops?

Cleanroom cooling solution

The cleanroom refrigeration plan of the clean room should be technically and economically compared according to the cooling requirements (cooling consumption, cooling method, chilled water temperature, etc.), the water source situation in the project construction area (water temperature, water quality, water quantity, etc.) and the preparation of the power source and heat source . It requires both good economic indicators and consideration of local possibilities.

The selection of refrigeration equipment in a dust-free workshop is the central link in the process of determining the refrigeration plan. The main types of refrigeration equipment are as follows.

1. Refrigeration and compression refrigeration unit in clean room

Compression refrigeration devices include three types: piston (reciprocating), centrifugal and screw.

The main equipment of the piston (reciprocating) compression refrigeration device is a piston refrigeration compressor, commonly used working fluid ammonia (NH3), freon-12, 22 (F-12, 22). This type of equipment is driven by a motor, which is convenient to use, has many varieties, and a full range of products. It can meet the requirements of various types of air conditioning for cooling, and is widely used. However, a large investment, high equipment costs, large power consumption, and complicated maintenance management.

The main equipment of the centrifugal compression refrigeration device is a centrifugal refrigeration compressor, and the common working medium is Freon—11, 113, 114 (F-11, 113, 114). This machine has the same principle as the piston refrigeration compressor, but it only has a rotary motion, which is smoother than the piston type, with less vibration and fewer parts. It is often combined with the evaporator and condenser, and the equipment is compact and covers a small area. Centrifugal refrigeration compressors have a large cooling capacity, so this type of equipment is only used when the air conditioning consumes a large amount of cooling.

The main equipment of the screw compression refrigeration device is the screw refrigeration compressor, and the common working medium is Freon-12, 22, ammonia (F-12, 22, R717). Compared with the piston type, the currently produced screw refrigeration compressor has a slightly lower efficiency, but due to its simple structure, small size, high suction coefficient, low exhaust temperature, and large single-stage compression ratio, it is not sensitive to wet stroke. The exhaust pulsation is small, the wearing parts are few, the column repair period is long, and the cooling capacity can be adjusted steplessly. Therefore, it is widely used in various refrigeration devices. Generally, it has good technical and economic indicators when used in refrigeration devices with a capacity range of (120-800)x105kJ\h.

2. Refrigeration absorption refrigeration device in dust-free workshop

Absorption refrigeration devices use thermal energy for refrigeration. Commonly used are ammonia-water absorption refrigeration devices and water-lithium bromide aqueous solution absorption refrigeration devices. The former is suitable for low temperature freezing; the latter is suitable for air conditioning cooling, making cold water for air conditioning or process above 4℃. The water in the lithium bromide absorption refrigeration is the working medium, and the lithium bromide aqueous solution is the absorbent. Its advantages are as follows.

It has great adaptability to the pressure of the steam heat source. When the steam pressure is 0.02-0.1MPa, a single-bromide lithium absorption refrigerator can be used, and when the steam pressure is 6.0-1.0MPa, a double-effect lithium bromide refrigerator can be used.

Secondly, the equipment is simple, basically a combination of heat exchangers, easy to manufacture, except for low-power canned pumps and vacuum pumps, there are no moving parts, so the vibration is small and the operation is stable; the equipment works under vacuum and the working medium is odorless and Poisonous, harmless to people, safe to use, simple to operate and manage; easy to automate equipment operation, cooling capacity can be automatically adjusted within the range of 10% to 100%; strong adaptability to cooling water temperature, even if it reaches 37 to 38℃, The equipment can still operate normally; saving electric energy. Under the same condition of single-unit cooling capacity, the power consumption of the lithium bromide refrigerator is only about 5% of that of the compression refrigerator, which is very suitable for regions with tight power supply and sufficient heat sources. However, lithium bromide absorption refrigeration also has shortcomings and limitations in use. The main reason is that the lithium bromide aqueous solution is strongly corrosive to metals when it is in contact with air. Once corroded, it will not only affect the heat transfer effect, reduce the service life, but also cause The equipment is damaged, so the equipment must be strictly sealed, and very careful in operation and management.

3. Refrigerated steam jet refrigeration device in clean room

The steam jet refrigeration device is also a kind of equipment that utilizes thermal energy for refrigeration, with water as the refrigerant and steam as the cooling power. The pressure of steam requires 0.2-0.8MPa, and its main advantages are: the equipment works under vacuum and has no rotating parts except for the pump; the refrigerant is water, which is harmless to people, safe to use, simple to operate; the equipment is simple and easy to manufacture, General machinery factories or machine repair workshops can be processed and manufactured; the equipment has a small investment and can be installed outdoors, saving civil engineering costs; can use waste heat in industrial enterprises or heating boilers in industrial enterprises, heating and heating in winter, and steam and cooling in summer .

The main disadvantage of steam jet refrigeration is its low efficiency. It is not economical to set up a dedicated boiler and use a small heating boiler to supply steam. It can be used when the temperature of frozen water is above 5℃, and it is more economical when it is above 100℃. Its efficiency varies with the temperature of the chilled water. The lower the chilled water temperature, the greater the steam consumption and the lower the efficiency. In addition, the amount of cooling water is large. Under the same conditions of single-unit cooling capacity, the cooling water required by the steam jet refrigerator is about 1.5 times that of the compression or bromine absorption type, which is not suitable for areas with tight water sources.

Jiangsu Jincheng Air Conditioning Engineering Co., Ltd. has been focusing on the design, development and production of industrial air conditioning equipment for many years. Its industrial refrigeration is widely used. The main products are: industrial air conditioning, chemical fiber industrial air conditioning, textile industrial air conditioning, chemical fiber industrial refrigeration, clean room refrigeration , Ventilation ducts, cooling towers, refrigerators and other air-conditioning units and accessories.

Jiangsu Jincheng is a rare conscience manufacturer in the industrial refrigeration industry. If you want to know more product information, please contact: Mr. Song 13705113637 Website: http://www.taocunbao.cn/