The difference is that the centrifuge group is more efficient. Most of them are chillers.
Air-cooled screws are common and can be used for cooling and heating, but the heating effect is not good, so they are mostly used in southern cities.
Centrifuge units are not air-cooled.
VRV is a bit like an air duct machine, both of which are fluorine systems. The difference is that there is more than one VRV. The compressor has variable refrigerant flow.
The air duct machine has an indoor machine.
The indoor unit is connected with the outdoor unit through copper pipes.
The indoor unit can be one in each room or one in multiple rooms.
When multiple rooms * * * use an indoor unit, air can be supplied to each room through the air duct.
As for return air?
It can also be used as a return duct.
Some practices can rely on the door to return air.
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Question 2: How does the central air-conditioning centrifuge work? Hello, let's explain the main working principle of high-speed freezing centrifuge. When a substance is precipitated in a medium, it is accompanied by diffusion, which is unconditional and absolute. The smaller the particles, the larger the diffusion range. Settlement is affected by external force, and the greater the mass of the object, the faster the settlement speed. Because some particles are too small to see the sedimentation process, there are high-speed freezing centrifuges.
High-speed freezing centrifuge uses the powerful centrifugal force generated by the high-speed rotation of the rotor of high-speed freezing centrifuge to accelerate the settling speed of particles in liquid and separate substances with different sedimentation coefficient and buoyancy densities in samples.
The high-speed freezing centrifuge mainly extracts the required components from the liquid mixture. According to the density of each substance, after high-speed rotation, the liquid with high density sinks to the bottom and the liquid with low density floats on it, thus layering the liquid and extracting the pure substance I need. It is used in medicine, chemical industry and many other fields.
I wonder if it will help you.
Question 3: What's the difference between central air-conditioning screw machines and centrifuges? Screw machine is stable and reliable, and its maintenance cost is low, but its energy efficiency ratio is not as good as that of centrifuge. Centrifuges are a little more efficient, but they are noisy and have higher maintenance costs than screw machines.
Question 4: Which brand of centrifuge is good for central air conditioning? Trane's good first and third stage compression can operate effectively in a wide capacity range, and even when the load is reduced to 10%, the unit will not produce "surge". However, "surge" will occur in single-stage compression at 30% load. In order to avoid this phenomenon, hot gas bypass must be adopted, but it wastes 2-20% energy. In addition, because each stage of the three-stage compression is equipped with an air inlet guide multi-leaf valve, the performance of part load is greatly improved. Second, closed structure, reliable motor cooling system makes the motor rotor and stator immersed in liquid refrigerant, so that the motor is in the best working state of about 3 degrees Celsius, providing effective and complete cooling under various load conditions, improving the efficiency of the motor, and because the shaft seal is cancelled, it is not easy to leak oil and refrigerant at the shaft seal like the open structure. 3. Low-speed operation of single-stage HCFC- 123: 7000- 10000 rpm/single-stage HCFC- 134a Unit: 14000- 16000 rpm/single-stage HCFC-22. Therefore, the noise of the unit is lower than 80 decibels. According to the field test of XX project, the noise of this unit is only 76 decibels. In addition, because the vibration is small, there is no special requirement for the equipment foundation of the unit, so it is not necessary to bury the angle bolts and put them on the foundation platform. Fourthly, direct driver is directly connected with the compressor, and the speed-increasing gearbox is cancelled. The existence of the speed-increasing gearbox makes the gear speed-increasing ratio large, the radial thrust large, and the gear wear gap gradually increases, thus increasing vibration and noise, shortening the service life and increasing energy consumption. Direct drive simplifies the design and has the highest reliability. V. Two-stage Economizer Three-stage compression Two intermediate economizers can be installed between the evaporator and the condenser to make the refrigerant flash at two intermediate pressures, thus improving the efficiency of the unit by 7%, which is impossible in a single-stage compression chiller.
Question 5: What's the difference between a central air-conditioning centrifuge and a screw compressor? One is screw compressor, which is divided into single screw and twin screw, and the other is centrifugal compressor. There are two cooling methods: air cooling and water cooling.
Question 6: What are the advantages and differences of central air conditioning, whether it is frequency conversion multi-line, screw machine, modular machine or centrifuge? In fact, multi-connection cannot be regarded as a traditional central air conditioner. In the traditional sense, central air conditioning is to feed water to the fan coil, and multi-connection is to directly add fluorine to the fan coil. Therefore, it is doomed that the multi-line pipeline cannot be too long, and it is also doomed that the energy loss of the multi-line pipeline is greater than that of the sub-machine. If the multi-line pipeline leaks, it is often impossible to repair it. Frequency conversion multi-line not all compressors are variable frequency, generally only one compressor is variable frequency, and the others are fixed frequency. Multi-line pipeline system is more complicated, and the control system is more complicated.
Screw machines and centrifuges are just compressors with different sizes, and there is basically no difference in others. The refrigeration capacity of screw machine is relatively small, and that of centrifuge is relatively large, so it is the largest central air conditioner at present.
Modular machine is a combined central air conditioner, which has both scroll machine and screw machine. The single machine is small in size, light in weight and small in floor space after splicing. As long as the type selection is correct, due to the large number of units and high relative reliability, there are often 10 or even 50 units in many places with high reliability requirements. When the load changes greatly, the modular machine saves electricity.
Question 7: How many kinds of central air conditioners are there? It can be roughly divided into three types.
1 central air conditioning all-air system
2 Central air conditioning water system
3 central air conditioning feng shui system
1. Full wind system; As the name implies, simply put, the all-air system means that the indoor temperature is completely reduced by cold air.
2 water system, that is, introducing chilled water into the room, reducing the temperature of the coil through the coil, recycling indoor air, thus reducing the temperature.
3. Fengshui system, that is, the combination of wind system and water system.
I hope it can help you solve the problem.
Question 8: The difference between central air-conditioning screw machine and centrifuge refers to compressor.
The difference is that the centrifuge group is more efficient. Most of them are chillers. Centrifuge units are not air-cooled. Air-cooled screws are common and can be used for cooling and heating, but the heating effect is not good, so they are mostly used in southern cities.
The ordinary screw machine can't be adjusted steplessly, and the vibration of the screw machine is not small. In addition to the difference in weight and volume, the installation is not as simple as that of a centrifuge, and there are no fewer pumps, cooling towers, fan pipes and differential pressure bypass.
Generally speaking, the bigger the centrifuge, the smaller the screw machine, the less the daily maintenance cost of the screw machine, the more centrifuges, the more units the screw machine needs for the same refrigeration capacity, and the higher the relative reliability. Noise: low-frequency noise of screw machine and high-frequency noise of centrifuge.
Question 9: What is the condensation tower of central air conditioning? It is not a condensing tower, but a cooling tower.
Large central air conditioner is used to cool the condenser of main air conditioner, such as screw unit, centrifuge unit and volute. Of course, these units are also air-cooled, but most of the small and medium-sized units are air-cooled, and the large units are water-cooled.
The central air conditioner uses a secondary refrigerant system, which is water. Like the screw unit, centrifugal unit and scroll unit just mentioned above, their main components and principles are the same as those of household air conditioners. The only difference is that the central air conditioner uses "water" to exchange heat with the host. Of course, there are also some technical differences in control and size.
Take refrigeration as an example, there are two water cycles at work.
The first type is frozen water: the water is cooled by the evaporator of the main engine (water is separated from the refrigerant of the evaporator)-the indoor heat is taken away by the indoor coil-and then returned to the evaporator to be cooled (that is, the evaporator absorbs the indoor heat to complete refrigeration).
The second type is cooling water: water takes the heat absorbed from the evaporator to the system through the condenser-to the cooling tower for cooling-and then returns to the condenser to continue to absorb heat. This cycle.
The cold-hot conversion in system operation is the phase change process of refrigerant. Gas to liquid-exothermic liquid to gas-endothermic.
Working principle of cooling tower:
As far as the take-away counter-current tower is concerned, it is an auxiliary equipment installed on the second circulating water (cooling water) system. Generally speaking, it is like a barrel, with a height of1.5-4m. The upper part is slightly smaller than the lower part, and the bottom is equipped with a water tray. A fan is installed at the upper part to blow air upwards, and a 360-degree rotating nozzle is installed at the bottom of the fan. (that is, a horizontal steel pipe is equipped with many nozzles rotating around the center, and its rotation does not require external power, but the nozzles spray water downward at 45 degrees. ) Small tributaries spray water downward at 45 degrees, and there are many wave-breaking plastic plates for changing the velocity and direction of water flow 30CM below the nozzle, with a certain gap between them. Vertical installation, water slowly flows down from above, and the fan sucks air from the bottom and blows it out from the top to achieve the purpose of cooling. The disadvantage of open countercurrent tower is that it is easy to get dirty and waste water (high-power fan will bring water out). Other types of towers work in a similar way.
Question 10: What kinds of central air conditioners are there? In terms of refrigeration methods, there are water separators, fans and refrigerants. Brands are made in China, Japanese and American. Your question is too general to answer. . .