The refrigerants of different ultra-low temperature freezer manufacturers are different. The refrigerants commonly used in LNEYA refrigeration equipment are R404, R22, etc. So, what is the difference between the two-120-degree ultra-low temperature freezer refrigerant?Since the saturation pressure of R404A is higher than R22, the design pressure of the pressure vessel in the system should be changed to ensure safety. Such as liquid storage and gas-liquid separators. At the same time, the set values of the safety valve and fusible plug installed on the system components will also change. Since the gas density of R404A is about 50% larger than that of R22 under the same exhaust gas amount, the pipe diameter selected is larger than R22 when piping design using R404A refrigerant.For the same compressor, the current of the R40A in the -120 degree ultra-low temperature freezer is greater than R22, so the wire diameter of the AC contactor, thermal relay and cable of the compressor should be adjusted. In terms of system protection, the high pressure switch setting is adjusted from the original 2.45 MPa to 2.7 MPa. The exhaust pressure of the R404A refrigerant is about 1.2 times that of R22, and the mass flow rate is about 1.5 times that of R22. The exhaust flow rate increases and the resistance increases. In general, the heat transfer capacity of the condenser is increased by 20% to 30% compared to R22.
The saturation pressure of R404A and R22 is different at the same temperature, so the action mechanism of the -120 degree ultra-low temperature freezer R404A thermal expansion valve is different from that of R22. At the same time, because the R404A refrigerant and lubricating oil have different compatibility with the sealing material, the expansion valve sealing material should also be changed accordingly. Therefore, the R404A special expansion valve should be selected in the selection of the thermal expansion valve. Since the saturation pressure of 404A is different from that of R22, the air tightness test pressure is greater than R22. At the same time, the vacuum degree of the system is higher than R22, and the water content is lower than R22. The refrigerant should be charged in liquid form during charging to prevent changes in the R404A configuration.The refrigerant R404A used in the 120 degree ultra-low temperature freezer is a non-azeotropic mixture. The concentration of the non-azeotropic mixture changes with temperature and pressure, which brings certain difficulties to the production, commissioning and maintenance of the refrigeration system. The heat transfer performance of the system will also have a certain impact, especially when the refrigerant leaks, the system refrigerant needs to be completely drained and replaced, so as to ensure the proportion of each mixed component, and also achieve the design cooling effect, otherwise it will get worse. .The refrigerant of the -120 degree ultra-low temperature freezer should be selected according to the corresponding equipment. LNEYA selects the corresponding environmentally friendly refrigerant refrigerant, which is more in line with the development of the environmental protection theme of the contemporary era.
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When the user buys and uses 100 freezers, LNEYA will have relevant instructions for use and will be sent to the user along with the device. So, what should I pay attention to when using the 100p freezer?When receiving the equipment, the user should first check the outer packaging to see if the accessories are complete. After unpacking, lift the 100p freezer off the wooden packaging base and lay it flat in a spacious position to check whether there is any damage in the transportation. After confirming the error, push it to the installation position, put the 100p freezer in a stable state, and then connect the external circulation and return water pipeline of the device.It is recommended to clean the water tank and the site before starting. There should be no corrosive gas and harmful impurities in the air. There is no strong electromagnetic field interference around. Avoid direct sunlight on the instrument. Check whether the ferrule or flange bolt of the external hose is Tighten.100p freezer power supply requirements, need to pay attention to single-phase three-wire system or three-phase five-wire system (corresponding model selection power supply specifications) with good grounding, grounding resistance is not more than 0.1 ohms. Just use the coolant to be injected, and the amount of coolant to be injected is better than the upper edge. To prevent foreign matter from clogging the pipeline, scaling, etc., use deionized water or special coolant. The water tank should be cleaned regularly, and the coolant in the water tank should be replaced regularly to prevent microbial growth.In addition, the use of the freezer also needs to pay attention to the use of temperature, ambient temperature, temperature control accuracy and flow rate related values, different types of power supply requirements, please correspond to the model.The instruction manual for the 100p freezer is as shown above. It is better to run the equipment according to the instructions.
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In order to make the high-temperature circulator run more efficiently, it is recommended to pay attention to the safety and choice of the heat-conducting oil. What should be paid attention to the heat-conducting oil of the high-temperature circulator manufacturer?Although the high temperature circulator heat transfer oil has a high boiling point and flash point, it is still a flammable liquid. Therefore, it should be safe when used. If it is used improperly, it may cause fire. The cause of the fire is caused by leakage. At this time, attention should be paid to leakage and fire. Related instructions.Misfire in the insulation zone is a common type of fire in organic heat transfer oil systems. Heat transfer oil leakage occurs at the flange or meter connection, and penetrates into the heat preservation zone. Then, in the presence of air, the circulating liquid and the pipe heat heat the heat transfer oil, and gradually oxidize the liquid, causing the heat preservation zone to be ignited and causing a fire.Pipe leakage or bursting causes fire due to pipe leakage or bursting, causing heat transfer oil to flow into the hot gas flame zone and causing fire. The flash point causes the flash point to be misfired. The higher the temperature of the high temperature circulator, the lower the flash point temperature, the heat transfer oil, air and fire source.The fire caused by the process raw materials is mainly caused by the leakage of the heat transfer oil into the heating system, and the process raw materials are easily oxidized and oxidized to cause fire. In addition to the above four types of fire, it should be more careful to use in the gas phase system, such as causing a large amount of heat transfer oil vapor leakage, can form an aerosol mist, which can cause explosive combustion when exposed to fire in the air.The heat transfer oil of LNEYA high temperature circulators is selected from brand heat transfer oil, because the choice of heat transfer oil is expiring and operating efficiency and safety.
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Ultra-low temperature refrigeration equipment is mainly used in industrial cold processing. Unlike some manufacturers of ultra-low temperature refrigeration equipment, LNEYA ultra-low temperature refrigeration equipment uses environmentally friendly refrigerant, which is conducive to the operation of ultra-low temperature refrigeration equipment. If the ultra-low temperature refrigeration equipment does not cool, how to Solve it?Generally speaking, if the ultra-low temperature freezer is not cooled, there are four main reasons. One is that the filter is clogged. When the filter is clogged, the dust on the condenser will accumulate more and more, and the refrigeration effect of the refrigeration equipment will be affected over time. . In the long run, it may even cause refrigeration equipment to fail to cool. Solution to filter blockage: Clean the filter regularly or irregularly. It is also possible that the coolant content is small, and the ultra-low temperature refrigeration coolant content is too small, which may cause the equipment to not absorb oil and reduce the cooling effect. Less coolant content Solution: Always check the coolant to see if the coolant level is maintained at high or low, and add coolant when the coolant is too low.
If the refrigeration equipment is not cooled, there may be a lack of refrigerant. In the refrigeration, after the refrigerant is used for a long time, the refrigerant will volatilize after a long use time, thereby affecting the cooling effect. Solution: Refrigerant may have certain harm to the human body, so if you encounter this situation, you should find a professional refrigeration equipment company to add. There is also the possibility that the ultra-low temperature refrigeration supply voltage is low or the power of the refrigeration equipment is insufficient, and the equipment may not be cooled.In general, the reasons and solutions for the non-refrigeration of ultra-low temperature refrigeration equipment are as shown above. It is recommended to find that the refrigeration faults are resolved in time to avoid affecting the production of the enterprise.
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Glycol Chiller System SUNDI -10℃ ～ 200℃, as we can tell from its name, it is to use Glycol as the refrigeration agent for the chiller. In the all air environment, because of the low temperature in the outdoors, it is impossible to use a cooling tower to supply the inner area directly with the cold air-conditioner. In addition, the cold air in the outdoors could be used directly as refrigerator source，with glycol as refrigerant, it can introduce the natural cold air into the inner area and supply cold air-conditioner. If we need to heat the outer area and provide cooling for the inner area, we can turn off the chiller and still use the boiler or the urban hot water as the heat source to heat the outer area.
Install plate heat exchanger in the outdoor, and the outdoor cold air is introduced into the plate heat exchanger by the fan. The glycol solution and the outdoor cold air are exchanged in the plate heat exchanger. The cooled glycol solution enters into the air conditioners in the inner area and exchange with mixed air. Then the mixed air enters into the inner room with lower temperature and supply cooling. The temperature of glycol solution rise up, it comes back to the plant heat exchanger in the outdoor again, exchange heat with the cold air in the outdoor and continue this cycling after the temperature is lowered. This way of heat exchange is usually used in the heat recycling system.It is a very energy-saving way that use glycol as a refrigerant to introduce the cold air in the outdoors to supply cooling for the inner area. All we need to do is to install a plant heat exchanger in the outdoor when it works, the cold water equipment closed, opening the fan and the air conditioners can bring cooling for the inner area. In this way, we can save energy and reduce the cost.
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Industrial water chiller compressor exhaust temperature determines whether the equipment can stably and efficiently run. The common problem of compressor is excess exhaust temperature. Once the situation appears, it is easy to make industrial chiller high pressure and high temperature, overload, reduced working efficiency and poor industrial water chiller compressor refrigerating capacity. It can also lead to other problems. So how to reduce the exhaust temperature of industrial water chillers and cool the compressor, we are the experts to develop water chiller refrigeration system 320/420 w / 430 w experts, so today LNEYA will recommend a few solutions for you:Increase cooling water flow and heat ventilation of water tank and water tower:Air-cooled water tank of industrial cold water machine and cooling water in industrial cooling towers are to cool the condenser and transfer heat which can take away the heat generated by the compressor work. If you can guarantee the cooling water flow rate and air cooling industry cold water machine water tanks, water chiller water tower cooling ventilation ability, you will keep cooling water temperature to within the limits defined, so as to maximize the cool the compressor.Reduce the exhaust temperature of the refrigeration compressor directly:You can start from decreasing compression ratio and the load of the compressor. Lower compression ratio will make compressor low efficient, but it can solve the problem of excess exhaust temperature of compressor.
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LNEYA screw chiller is suitable for all kinds of chemical, pharmaceutical, mechanical and other fields of production process cold source, can provide -25 ° C ~ 30 ° C chilled water, can be used as ice cold storage, low temperature air supply and other production processes required process cold source.LNEYA's screw chiller production specifications:1. Standard design conditions are: chilled water: effluent temperature 7 ° C, return water temperature 12 ° C; condensing temperature 30 ° C2. Refrigerant type is R22, if you want to use R404a, R134a, R407c or other models please declare.3. Due to continuous updating of product technology, the above data is subject to change without notice.4. In addition to the listed product models, our company can also customize non-standard evaporative condensing unit according to customer requirements.We are the technology leader for high precision thermoregulation solutions in research and development industry. Our products ensure precise temperature control throughout the whole world in the semiconductor industry, chemical/pharmaceutical industry, biotechnology industry, research/lab/university, food/medical/hospital (health)and laptop/Mobile Phone. Our products offer temperature control solutions for applications from -152 to +350°C.
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