2. The selection of water chillers should be considered according to the cooling load and use. For the refrigeration system with long working time under low load, it is advisable to choose multi-head piston compressor or screw compressor, which is convenient to adjust and save energy.
3. When selecting water chillers, give priority to units with higher efficiency coefficient. According to statistics, the annual execution time of general water chillers under 100% load accounts for less than 1/4 of the total execution time. In the total execution time, the execution time proportion of 100%, 75%, 50% and 25% load is approximately 2.3%, 4 1.5%, 46. 1% and1. Therefore, when selecting water chillers, the model with relatively flat efficiency curve should be given priority. At the same time, the adjustment range of chiller load should be considered in the design and selection. Multi-head screw chiller has excellent partial load efficiency and can be selected according to the actual situation.
4. When selecting water chillers, attention should be paid to the conditions of rated working conditions. The actual cooling capacity of water chillers is related to the following factors:
A) cold water outlet temperature and flow;
B) Inlet water temperature, flow rate and fouling coefficient of cooling water.
5. When selecting a water chiller, attention should be paid to the normal working range of this type of unit, mainly because the current limit of the main motor is the current value of the shaft power under rated working conditions.
6. During the design and selection, it should be noted that the outlet temperature of cold water should not exceed 65438 05℃ and the outdoor dry bulb temperature of air cooling unit should not exceed 43℃ under the rated working condition flow. If it is necessary to exceed the above range, you should know whether the use range of the compressor is allowed and whether the power of the main motor is sufficient.
Suzhou Zhide Air Conditioning Equipment Engineering Co., Ltd. has been focusing on the design, installation, maintenance, renovation and maintenance of central air conditioning system, the supply of central air conditioning accessories and consumables, and the water quality treatment of circulating water system since its establishment.
How to save energy for Aili water-cooled screw chiller? The energy-saving principle of air source heat pump blower is that the compressor of air source heat pump is driven by electric energy to do work, and the refrigerant absorbs the low-grade heat of air at ambient temperature from the evaporator, transports it to the compressor, and is compressed into high-temperature and high-pressure refrigerant by the compressor. The electric energy consumed by driving the compressor to do work is converted into mechanical energy, and then into heat energy, which is absorbed by the refrigerant together, condensed by the condenser and converted into high-temperature air exchange for drying, and the maximum energy efficiency ratio is 4.25.
How about the price of water-cooled screw chillers? We have two or three Kadeli chillers in Da Qiao. One KDS-080SLA seems to be140,000, which is much more expensive than other chillers. This is the water cooler ordered by our engineering department.
Water-cooled screw chiller Water-cooled screw chiller brand, Kadley Group brand is good, our factory uses theirs, Hitachi can also. The quality is similar, and the price is higher than theirs, for your reference.
The biggest difference between industrial water chillers and industrial and civil water-cooled screw chillers lies in the convenience of annual cooling/summer cooling maintenance and high reliability/energy saving. The design ideas are different.
Air cooled screw chiller Group Function: Kadley air cooled screw chiller Group-Function
1. The air-cooled condenser is of fin type, made of double-oil corrugated hydrophilic aluminum platinum and manufactured by professional heat exchanger processing equipment. It has the advantages of compact structure, small volume, light weight and high heat exchange efficiency, and is equipped with a low-speed axial fan with large blades, which can effectively reduce the execution noise and reduce the impact on the surrounding environment.
2. The control system of the unit adopts imported PLC program controller, and the man-machine field is equipped with large-screen touch screen, with simple interface and intuitive operation.
3. The unit has reliable safety protection device.
Including:
High and low voltage protector,
Exhaust overheat protector,
Compressor motor overheat protector,
Current carrying protector,
Antifreeze temperature protector,
Water flow protector,
Emergency stop switch,
Heat-sensitive fusible plug,
Safety valve, etc.
How to calculate the cooling capacity of water-cooled screw chiller? Generally, the cooling capacity of water-cooled screw machine is based on the cold tons in the United States, 1 cold tons = 3.5 16KW, and the cooling capacity of fan coil is based on KW, so it can be converted.
How to classify screw chillers? Kadeli Technology Department will be happy to answer your questions.
The screw refrigeration compressors used in 1. are classified in different ways. Screw refrigeration compressors are divided into twin-screw and single-screw types. The twin-screw refrigeration compressor has a pair of rotors with spiral teeth, which are engaged with each other and rotate in opposite directions. The rotor screw of a single-screw refrigeration compressor has six spiral grooves on its outer cylindrical surface. The same planetary gear with 1 1 rack is vertically installed on the left and right sides of the butterfly and lever.
2. According to its condensation mode, it is divided into water-cooled screw chiller and air-cooled screw chiller.
3. According to the sealing structure of the compressor, it can be divided into open, semi-closed and fully closed.
4. According to the air conditioning function, it can be divided into single cooling type and heat pump type.
5. According to the different refrigerants used, it can be divided into R 134a and R22.
6. According to the different structure of evaporator, it can be divided into ordinary type and full liquid type.
Advantages of screw chillers:
1, simple structure, few moving parts and wearing parts, only piston type110, low failure rate and long service life.
2, the circular motion is stable, there is no "surge" phenomenon during low load operation, and the noise and vibration are low.
3, the compression ratio can be as high as 20, and the EER value is high.
4. Convenient adjustment, stepless adjustment within the range of 10%~ 100%, high efficiency under partial load and remarkable power saving.
5, small size and light weight, and can be made into a vertical fully enclosed large-capacity unit.
6. Not sensitive to wet scratching.
7, positive pressure, there is no external air intrusion corrosion problem.
Screw rotor profile design of screw chiller, compressor rotor is directly driven by motor, advanced economizer has outstanding compression efficiency and quiet operation, dual-loop design, stepless adjustment of compressor capacity through slide valve and accurate dynamic control of electronic expansion valve, optimization of partial load of system, efficiency and intelligent energy-saving reset function, automatic adjustment of chilled water when backwater or outdoor environment temperature drops, and outlet water temperature with automatic switching function of air conditioning and ice-making conditions, so as to realize efficient integration with ice storage system and perfectly meet the needs of energy-saving buildings. The lowest outlet water temperature of evaporator can reach-12℃, and the highest outlet water temperature of condenser can reach 63℃.