Comparison of advantages and disadvantages of six commonly used water-cooled units
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1. The materials are simple, common metal materials can be used, the processing is easy, and the cost is low;
2. The system is simple in installation, easy to lubricate, and does not require an exhaust device;
3. With multiple heads, high-speed and multiple cylinders, the performance can be improved.
Disadvantages:
1. There are many parts and wearing parts, the maintenance is complicated and frequent, and the maintenance cost is high;
2. The compression ratio is low, and the cooling capacity of a single machine is small
; 4.
It is a reciprocating motion up and down, and the vibration is large;
5. The weight index per unit cooling capacity is large.
1. Simple structure, less moving parts, less wearing parts, only 1/10 of the piston type, low failure rate, long life;
2. Smooth circular motion, no "surge" phenomenon during low-load operation, noise Low vibration, low vibration;
3. The compression ratio can be as high as 20, and the EER value is high;
4. It is easy to adjust and can be adjusted steplessly in the range of 10%~100%, with high efficiency and significant power saving at partial load;
5. Small size, It is light in weight and can be used as a vertical fully enclosed large-capacity unit;
6. It is not sensitive to wet stroke;
7. It is a positive pressure operation, and there is no problem of external air intrusion and corrosion.
1. The price is higher than that of the piston type; 2.
The capacity of a single unit is smaller than that of the centrifugal type; .Requires high machining accuracy and assembly accuracy.
1. High impeller speed, large gas transmission capacity, and large single machine capacity;
2. Fewer wearing parts, reliable operation, compact structure, stable operation, low vibration and low noise;
3. Small weight index per unit cooling capacity;
4. No lubricating oil is mixed in the refrigerant, and the heat transfer performance of the evaporator and the condenser is good;
5. The EER value is high, the theoretical value can reach 6.99
;
Disadvantages:
1. The single-stage compressor will have a "surge" phenomenon at low load, and run smoothly at full load;
2. Strict requirements for material strength, machining accuracy and manufacturing quality;
3. When the operating conditions deviate from the design conditions When the efficiency drops faster, the cooling capacity decreases faster than the piston type with the decrease of the evaporating temperature;
4. Centrifugal negative pressure system, the outside air is easy to intrude, and there is a danger of chemical changes and corrosion of the pipeline.
1. It is an improved type of piston type and screw type, which is composed of multiple chiller units;
2. The unit is small in size, light in weight, low in height, and occupies a small area;
3. Simple installation, no need to reserve installation Holes are easy to combine on site, especially suitable for renovation projects.
Disadvantages:
1. The price is more expensive;
2. The number of modules should generally not exceed 8.
1. Energy saving, heat can be recovered during operation in winter;
2. It is derived from nature;
4. The installation is convenient and the maintenance cost is low;
5. The application is flexible and the adjustment is convenient.
Disadvantages:
1. The fresh air cannot be used to the maximum in the excessive season;
2. The unit is noisy.
1. Fewer moving parts, low failure rate, smooth movement, low vibration and low noise;
2. Simple processing, convenient operation, and can achieve 10%~100% stepless adjustment;
3. Lithium bromide solution is non-toxic and has no effect on the ozone layer Destructive effect;
4. The waste heat can be used. Waste heat and other low-grade heat energy;
5. Low operating cost and good safety;
6. Using heat energy as power, less electricity consumption.
Disadvantages:
1. The service life is shorter than that of the compression type; 2. The power saving is not energy saving ,
the steam consumption is large, and the thermal efficiency is low;
Strict requirements; sealing, which brings inconvenience to manufacture and use;
4. The heat discharge load of the unit is larger than that of the compression type, and the water quality of the cooling water is higher;
5. The lithium bromide solution is strongly corrosive to carbon steel, which affects the life and performance of the unit .
