Industrial chillers are divided into water cooled industrial chillers and air cooled industrial chillers. The difference between them is mainly the difference in condensers. The condenser of the water cooled chiller mainly removes heat by circulating cooling water, so the water cooled condenser of the water cooled chiller is also commonly called a water cannon. Different from the water cooled type, the air cooled industrial chiller uses a fan for heat dissipation. A finned condenser is usually used. The fins actually refer to aluminum sheets. The parts that need heat exchange are externally installed with aluminum sheets to achieve efficient heat dissipation, and then the hot air is drawn out through a powerful fan. Therefore, when the temperature of the workshop is high, the air-cooled chiller will not only be affected by itself (the high temperature of the condenser will directly cause the high pressure alarm of the industrial chiller, and the cooling capacity will decrease), it will also have a direct impact on the temperature of the workshop. The advantages of water-cooled chillers are obvious. The water-cooled industrial chiller requires the cooling water tower to circulate cooling water to cool down. Therefore, to use the water-cooled chiller, it is necessary to install the cooling water tower, the cooling water circulating pump, and the pipeline, which is cumbersome. Compared with air-cooled industrial chillers, the ease of movement pales in comparison. But in most cases factories are already equipped with cooling water circulation system.

Condenser: In the refrigeration process, the condenser plays the role of outputting heat energy and condensing the refrigerant. After the high-pressure superheated vapor discharged from the refrigeration compressor enters the condenser, all the heat absorbed in the working process, including the heat absorbed from the evaporator and the refrigeration compressor and in the pipeline, is transferred to the surrounding medium (water or Air) is taken away; the high-pressure superheated vapor of the refrigerant is re-condensed into a liquid. (According to the different cooling medium and cooling methods, condensers can be divided into three categories: water cooled condensers, air cooled condensers, and evaporative condensers.) Liquid accumulator: The liquid accumulator is installed after the condenser and is directly connected to the discharge pipe of the condenser. The refrigerant liquid of the condenser should flow into the liquid receiver unimpeded, so that the cooling area of the condenser can be fully utilized. On the other hand, when the heat load of the evaporator changes, the demand of the refrigerant liquid also changes accordingly, and the accumulator plays the role of adjusting and storing the refrigerant at that time. For the small chiller refrigeration system, the liquid receiver is often not installed, but the condenser is used to adjust and store the refrigerant. Filter drier: In the refrigeration cycle of the chiller, it is necessary to prevent the entry of moisture and dirt (oil, iron filings, copper filings), etc. The source of moisture is mainly the trace moisture contained in the newly added refrigerant and lubricating oil, or due to Moisture from air ingress during system maintenance. If the water in the system is not removed, when the refrigerant passes through the throttle valve (thermal expansion valve or capillary), the water will sometimes freeze into ice due to the drop in pressure and temperature, blocking the channel and affecting the normal operation of the refrigeration device. Therefore, a filter drier must be installed in the chiller refrigeration system. Evaporator: The evaporator is a heat exchange device that relies on the evaporation (actually boiling) of the refrigerant liquid to absorb the heat of the cooled medium. Its function in the refrigeration system is to absorb heat (or output cooling). In order to ensure that the evaporation process can be carried out stably and lastingly, the evaporating gas must be continuously pumped out by the refrigeration compressor to maintain a certain evaporation pressure. Thermal expansion valve: The thermal expansion valve is not only a flow control valve in the chiller refrigeration system, but also a throttle valve in the refrigeration equipment. It is installed between the drying filter and the evaporator in the refrigeration equipment. It is wrapped at the outlet of the evaporator. Its main function is to throttle and depressurize the high-pressure and normal-temperature r...

Air-cooled chiller: a type of chiller, the water at room temperature is cooled to a certain temperature by the compressor of the condensing unit to strengthen the cooling of the mold or machine, as a stand-alone use, the heat dissipation device is a built-in fan, there are mainly three mutual Contact systems: refrigerant circulation system, water circulation system, electrical automatic control system. Refrigerant circulation system: The liquid refrigerant in the evaporator absorbs the heat in the water and begins to evaporate, and finally a certain temperature difference is formed between the refrigerant and the water, and the liquid refrigerant is also completely evaporated into a gaseous state, which is then sucked in and compressed by the compressor. (increase in pressure and temperature), the gaseous refrigerant absorbs heat through the condenser and condenses into a liquid. After throttling through the expansion valve (or capillary), it becomes a low temperature and low pressure refrigerant and enters the evaporator to complete the refrigerant cycle process. Water circulation system: The water pump is responsible for pumping water from the water tank to the equipment that the user needs to cool. The chilled water takes away the heat and then the temperature rises, and then returns to the chilled water tank. Electrical automatic control system: including power supply part and automatic control part. The power supply part supplies power to compressors, fans, water pumps, etc. through contactors. The automatic control part includes thermostat, pressure protection, delay device, relay, overload protection, etc. to achieve automatic start-stop, protection and other functions according to the water temperature.

The air-cooled screw cold water heat pump unit is a central air-conditioning unit that uses air as the cooling medium (summer) and heat source (winter), water as the refrigerant, and adopts a vapor compression refrigeration cycle. The unit has the characteristics of both heating and cooling. It can form a centralized or semi-centralized central air-conditioning system together with fan coil units, air conditioning boxes, and air handlers. It has the characteristics of flexible layout and various control methods. Refrigeration cycle: During refrigeration: the compressor continuously extracts the refrigerant vapor from the evaporator, and after compression by the compressor, the refrigerant changes from low temperature and low pressure vapor to high temperature and high pressure vapor. The high-temperature and high-pressure refrigerant vapor is condensed in the air cooled condenser, and a large amount of heat is released and absorbed by the air. The high-pressure liquid refrigerant condensed by the air cooled condenser is throttled and depressurized by the thermal expansion valve, and turned into a low-pressure refrigerant liquid. The low-pressure refrigerant evaporates in the evaporator and absorbs a lot of heat from the refrigerant water, thereby reducing the temperature of the refrigerant water and achieving the purpose of refrigeration. The low pressure refrigerant vapor is extracted by the compressor, thus forming a refrigeration cycle. Heating cycle: When heating: the compressor of condensing unit continuously extracts the refrigerant vapor from the evaporator, and after being compressed by the compressor, the refrigerant changes from low temperature and low pressure vapor to high temperature and high pressure vapor. The high temperature and high pressure refrigerant vapor is condensed in the condenser, and a large amount of heat is released and absorbed by the heat medium water, so as to achieve the purpose of heating. The low pressure refrigerant vapor is extracted by the compressor, thus forming a heating cycle.

The oil blockage of the refrigeration system of the cold storage refers to the phenomenon that the valve hole of the thermal expansion valve is blocked by the solidified lubricating oil and hinders the flow of the refrigerant. It usually occurs in the refrigeration system of low-temperature cold storage, or due to the selection of high freezing point and inferior refrigeration oil. Because the freezing point of inferior refrigeration oil is high, it may cause the refrigeration lubricating oil to flow through the valve hole of the thermal expansion valve after mixing with the refrigerant. , Due to the sudden drop in temperature, part of the lubricating oil is precipitated from the refrigerant and frozen into a thick paste, causing the valve hole of the thermal expansion valve to be blocked. When encountering the problem of oil blockage in the refrigeration system, it is usually necessary to replace the refrigeration oil.

The characteristic of the cold storage system is that the compressor of the refrigeration system is running normally, but the cooler unit is not frosted, the high-pressure exhaust pressure is lower than the normal value, and the low-pressure return air pressure is lower than the normal value or even negative. After the refrigeration system is dirty and blocked, the refrigerant cannot circulate, causing the low pressure protection of the high and low pressure relays to act, and the compressor shuts down. Manually turn on the condensing unit again, and the failure phenomenon remains, which is a typical dirty blockage failure. The thermal expansion valve is often dirty and blocked, which is characterized by: when the inlet of the expansion valve is frosted (or the valve cover is also frosted), the temperature of the liquid inlet pipe is lower than the normal temperature, and even condensation occurs. The suction pressure of the compressor is lower than the corresponding normal pressure at the storage temperature, and the temperature in the cold storage decreases slowly or does not drop, which indicates that the thermal expansion valve is dirty and blocked. The solution to the problem of dirty blockage in the thermal expansion valve is to close the shut-off valve from the liquid outlet valve of the refrigeration system to the cooler unit. Disassemble the liquid inlet of the expansion valve, take out the filter screen and clean it with kerosene and put it back in again. After replacing the desiccant in the drying filter, first open the stop valve of the liquid inlet of the drying filter, and loosen the liquid outlet of the thermal expansion valve. After the gas escapes, tighten it and then open the stop valve of the liquid outlet of the thermal expansion valve, which can eliminate the failure phenomenon and restore the normal operation of the refrigeration system.

The characteristics of ice blockage in the cold storage system are that the compressor of the refrigeration system works normally, but the refrigeration effect is poor, the high-pressure exhaust pressure is lower than the normal value, and the low-pressure return air pressure is lower than the normal value or even negative. When the refrigeration system is blocked by ice, the refrigerant cannot circulate, causing the temperature in the cold room to rise, and the cooler unit will automatically defrost. After the cooler unit is clean, the refrigeration system resumes cooling. The ice blockage of the thermal expansion valve generally occurs at the throttle hole of the expansion valve. The fault feature is: the refrigeration system starts to operate normally, but after a period of time, the evaporator begins to defrost. After the defrosting process is over, the evaporator returns to the cooling state, and the defrosting phenomenon occurs again after a period of time. The solution to the problem of ice blockage in the thermal expansion valve is: for the thermal expansion valve slightly blocked by ice, a hot towel can be applied to the ice block of the thermal expansion valve, the ice block can be removed, and the operation of the refrigeration system can be restored; if the degree of ice blockage is relatively high If it is serious and the normal operation of the refrigeration system cannot be restored, close the stop valves at both ends of the drier filter, remove the drier filter from the refrigeration system, and after replacing the desiccant in the drier filter, first open the inlet of the drier filter. The shut-off valve, loosen the shut-off valve at the liquid outlet, and then tighten the shut-off valve at the liquid outlet of the drier filter after the gas escapes, so as to eliminate the failure phenomenon and restore the normal operation of the refrigeration system.

International Labor Day is approaching, the employees of KITDOO Refrigeration Equipment Company congratulate you on a happy holiday. The company holiday is from April 30 to May 4. During the holiday, the production base will suspend production. The sales department accepts business as usual. In order to facilitate your access to our customer service during the holiday season, you can get in touch with the customer service staff by mail. KITDOO Refrigeration Equipment Company is a professional manufacturer of condensers, air cooler units and condensing units. Provide professional cold storage installation technology and advice. Provide customers with professional cold chain one-stop service.