A: The circulating water temperature of the closed cooling coil must be maintained at or above 7 ℃. The circulating water in a closed system may freeze even if it remains flowing without heat load. Proper antifreeze measures must be taken, and generally, the following three methods should be considered:1) To maintain a certain heat load on the circulating water, immersion electric heaters can generally be installed in the piping system or electric heat tracing can be added to the pipeline; At the same time, the circulating water in the closed system should maintained an appropriate flow rate (recommended for customers to maintain at 10-15 m3/h), and real-time temperature monitoring should be achieved through temperature sensors and control systems.2) Add antifreeze, such as ethylene glycol or propylene glycol, to the cooling coil. It should be noted that if users purchase on their own, they should choose branded products because the quality of antifreeze on the market varies greatly.3) If the downtime is short or slightly long, an automatic bypass heating system can be set up to switch the fluid circulation in the pipeline and maintain a certain heat load on the fluid inside the pipeline.4) If the shutdown is extremely long or seasonal, it is recommended that users use compressed air (usually below 0.4Mpa) or other auxiliary means to empty the water in the coil heat exchanger to prevent the closed cooling tray tubes from freezing.

A: 1. Corrosion and leakage of the closed cooling tower bodyThe water leakage in this part may be due to the long-term corrosion of the tower material caused by the usage environment, resulting in uneven thickness of the tower. Destructive water leakage may occur in thinner areas. For the sealing method of this cooling tower, surface cleaning, polishing cleaning, cleaning agent degreasing, epoxy repair agent, and fiberglass tape reinforcement methods can be used. 2. Leakage at the junction of the closed cooling tower body and the water tankWhen installing a closed cooling tower, the outer shell plate should be tightly sealed with sealant. Long-term operation and the impact of water spray can cause deformation of the cooling tower body, resulting in the detachment of sealant and water leakage at the connection. Sealing method:Fangnuo heat transfer cooling tower suggests filling the internal gaps of the cooling tower with sealant to prevent leakage. 3. Leakage in the connecting pipe of the closed cooling towerWhen connecting the pipeline to a closed cooling tower, some flanges and elbows will be connected. According to the experience of Fangnuo heat transfer cooling tower, a sealing ring will be added between the two connections when making connections. If there is a leakage in the pipeline, the main reason is that the pipeline connection is not tight, the sealing ring is damaged, or the position is offset, resulting in weak sealing and water leakage. Leak sealing method: We can try tightening the pipeline or replacing it with a new sealing ring. 4. Closed cooling tower water pump leakageLeakage of the water pump in a closed cooling tower can cause unstable pressure and guide to system overheating or shutdown. Under normal circumstances, water pump leakage is relatively rare, mainly due to surface wear of the pump machinery or failure of the mechanical seal. Leakage prevention method: readjust the dynamic and static balance, replace the water pump seal, etc.

A: When the temperature is high in summer, if the cooling effect is not very obvious, the 1st thing to do is to turn on the sprinkler system of the entire system. The sprinkler system can effectively alleviate the problem of high temperature. By relying on a large amount of cooling circulating water for heat exchange, the temperature can be effectively controlled. And when the temperature is controlled within the normal range, we can stop the sprinkler system. By relying on air cooling to continue cooling and then turning on the spray when the temperature is high, this cycle can control the temperature and reduce energy consumption. 2. What should I do if the temperature of the cooling tower is high in summer and the cooling effect is not good? Opening the spray still cannot cool down. The temperature in certain areas during summer is very high, and even after the sprinkler system is turned on, the temperature cannot be controlled within the normal required range. At this point, the cooling capacity of the cooling tower has reached its limit. Due to the impact of ambient temperature on the cooling efficiency of the cooling tower, we will adopt the method of intermittent replenishment of cold water at this time. This will cause some cooling water loss, but it can significantly reduce the temperature. If we want to consider the issue of water conservation, we can install a thermal valve in the outlet valve and automatically control the replenishment of cold water through PLC. After the temperature drops, the replenishment of cold water will automatically stop. 3. The air volume of the fan will accelerate the flow of air inside the tower, accelerate the conversion of heat, and the angle of inclination, speed, and installation angle of the maple leaf will all affect the air volume. In the case of consistent air volume and type, the cooling effect is much better when the cooling water volume is smaller than larger. We can adjust the design of the cooling tower appropriately. 4. The temperature of the cooling tower is high in summer, and the cooling effect is not good. In the early design stage of the cooling tower, the local wet bulb temperature should be considered and calculated according to the summer temperature. In the northern regions of China, the design temperature can generally meet the requirements, but in the southern regions, it will be affected. The environment inside the cooling tower is a high-temperature and humid environment, with more rainfall, high air humidity, and high temperature in the south. This environment is similar to the internal environment of the cooling tower, so it will have a certain impact on the heat transfer efficiency of the cooling tower. Therefore, when selecting a cooling tower, it is necessary to design it slightly larger.

A: 1. Cooling principle of the open cooling tower: by spraying circulating water on the packing in the form of spray, heat exchange is achieved through the contact between water and air, and then the fan drives the air circulation in the tower to bring out the hot air after heat exchange with water, so as to achieve cooling. This cooling method requires less initial investment, but has higher operating costs (water and electricity consumption). 2. The cooling principle of a closed cooling tower: Simply put, it consists of two cycles: an internal cycle and an external cycle. The main core part is the copper tube surface cooler ① Internal circulation: Connect with the target device to form a closed circulation system (with soft water as the circulating medium). Cooling the target device by transferring the heat from the target device to the cooling unit.② External circulation: In the cooling tower, it cools down the cooling tower itself. Not in contact with the internal circulating water phase, only through the copper tube surface cooler in the cooling tower for heat exchange and dissipation. Under this cooling method, the operation of the motor is set according to the water temperature through automatic control. Two cycles are required to run simultaneously in high environmental temperatures during spring and summer. The environmental temperature is not high in autumn and winter, and in many cases, only one internal cycle is needed.

A: 1. Determining flow rate: The simplest method is to select based on the actual flow rate and pressure of the circulating water pump on site; Or choose according to the required cooling water volume of the equipment. 2. Determine temperature: Based on the cooling water requirements of the equipment, determine the outlet temperature and inlet temperature of the equipment, which are the inlet and outlet temperatures of the cooling tower; Cooling towers can be divided into three types based on temperature: standard cooling towers, medium temperature cooling towers, and high temperature cooling towers. You can choose according to your specific needs. 3. Determine the installation environment of the cooling tower: Select the type based on the actual environmental location of the cooling tower installation. When selecting a cooling tower, attention should be paid to the stability, durability, corrosion resistance, and precise assembly of the tower structure material.

A: 1. The water heat exchange area utilizes the heat conduction of water, where high-temperature water transfers heat to cups with lower temperatures. For example, if the same amount of water is introduced into a water cup and a wide-mouthed bowl, the temperature of the water in the bowl will be lower than that in the cup at the same time, which is the area of heat exchange. 2. The flow of air is mainly controlled by high fans. The size and power of a fan are not necessarily better, so the design of a fan needs to be set according to the usage of the equipment. Generally speaking, the larger the fan blades of a fan, the faster the speed and the greater the guided airflow. On the contrary, the air volume will decrease. Inside the box of the evaporative condenser, regardless of whether we have installed a spray device or not, we must choose the appropriate air volume. 3. Heat is conducted to the air or water inside the box through the condensing coil, and the temperature of the air will quickly rise. If the hot air continues to stay inside the box, it cannot absorb new heat, so the heat conduction of the condensing coil will slow down. 4. The choice of fan is also very important: the setting of the fan can also take away the hot air inside the box, and fresh low-temperature air will be sucked in from the bottom for further heat conduction before being discharged. This circulation can continuously transfer the heat from the condenser coil, achieving the purpose of cooling.