The difference between closed cooling tower and open cooling tower

open cooling tower:

Open cooling tower is a kind of equipment that uses the contact of water and air to dissipate the waste heat generated in industry or refrigeration and air conditioning through evaporation. The basic principle is: after the dry (low enthalpy) air is pumped by the fan, it enters the cooling tower from the air inlet network; the high-temperature water molecules with high saturated steam partial pressure flow to the air with low pressure, and the damp heat (high enthalpy value) The water self-seeding water system is sprinkled into the tower. When water droplets are in contact with air, on the one hand, due to the direct heat transfer of air and water contact, on the other hand, due to the pressure difference between the surface of water vapor and air, evaporation occurs under the action of pressure, that is, through heat transfer with unsaturated dry air, the sensible heat of water is taken away, and part of the water evaporates to take away the latent heat in the water, so as to achieve the purpose of cooling water cooling.

 

 

closed cooling tower

Is the use of water and coil contact, through the tube wall heat transfer heat transfer to take away the heat of the coil cooling medium to achieve the purpose of cooling. The circulating water in the closed cooling tower only circulates inside the cooling tower to exchange heat with air for cooling, then contacts with the coil to take away the heat of the working medium in the coil, and the water supplement pipe properly supplements water. Compared with the open cooling tower, the obvious feature of the closed cooling tower is to increase the coil. The liquid working medium to be cooled flows in the steel coil without direct contact with water and exchanges heat through the pipe wall.

 

 

The specific differences of the open-close cooling tower are summarized as follows:

01, the cooling principle is different. As expressed in the above concept, the closed cooling tower medium is a fully enclosed cycle in the cooling coil and does not directly contact with the air, while the open cooling tower medium is directly cooled by the filler.

02, the cooling method is different. The closed cooling tower realizes the double circulation cooling mode, that is, the combination of air cooling and water cooling, while the open cooling tower is a single circulation cooling mode, only air cooling.

03, the cooling medium is different. Closed cooling tower can be directly cooling water, oil, alcohol, quenching water, salt water and chemical liquid and other media, media without loss, stable composition, and open cooling tower in principle can only cooling water.

04, the cooling temperature is different. The closed cooling tower can cool the high temperature medium, while the open cooling tower can only cool the water below 65 ℃ in principle, which largely depends on the material of the heat sink.

05. The price is different, the cost of closed cooling towers is relatively high, generally three to five times that of open cooling towers

 

 

06, energy saving effect is different. Closed cooling tower drift rate and evaporation is much lower than the open cooling tower

07, the degree of protection of the cooled equipment is different. The circulating fluid operates in a closed manner, so it will not be polluted, evaporated or concentrated, and there is no need to replenish water and add medicine, thus ensuring the usability and service life of the associated equipment, and the daily management is also very convenient. However, the circulating fluid of the open cooling tower is concentrated due to evaporation, and must be dosed and replenished all the year round. Moreover, the fluid is easily polluted due to direct contact with air.

08, the degree of maintenance is different. Closed cooling tower does not need frequent downtime maintenance, stable and safe operation, can reduce the failure rate of associated equipment, suitable for continuous operation of the system; and open cooling tower must be frequently shut down maintenance, not suitable for continuous operation of the system.

09, the use of different performance. For example, the closed cooling tower circulating fluid will not produce algae and salt crystals due to no sunlight and no contact with air, "no need to remove algae and salt", thus ensuring the high-performance operation of the system; while the open cooling tower circulating fluid is open and exposed to the sun, it is easy to produce algae and salt crystals, thus affecting the performance of the system.

10. Environmental protection. Closed cooling tower can be dry operation, will not breed all kinds of bacteria, so it is especially suitable for air purification needs of the occasion, but also often used in dry areas; open cooling tower can not be dry operation.

11, Security. Closed cooling tower when the fluid is volatile or toxic, irritating solution, the use of closed circulation system, will not pollute the environment, so widely applicable to the fluid has strict requirements of the system; and open cooling tower when the fluid is volatile toxic, irritating solution, the use of open cooling tower operation mode there is a safety hazard.

 

Summary:

There is a big difference between open cooling tower and closed cooling tower, but the cooling tower is not good or bad, only suitable for the needs of the cooling system, different cooling systems provide different cooling methods and cooling tower type. When customers choose cooling towers, they can compare them according to process requirements and budget. According to the customer's local environment, the temperature and humidity of the oasis ice peak are calculated by professional equipment to bring better cooling effect to the customer.

1, stability: closed cooling tower circulating water is usually soft water closed cycle, effectively prevent the long-term use of the tower or user equipment in the process of scale and damage to the equipment.

Water saving: Compared with the traditional cooling tower, the closed cooling tower is more suitable for use in areas with scarce water resources because of the use of a fully closed internal circulation and the use of high-efficiency dehydration devices.

3, energy saving: closed cooling tower can be based on the temperature to control the number of fans to start, and the spray pump to open and close, you can also install a regulating valve to control the flow.

Environmental protection: the closed cooling tower is not polluted through the fully enclosed inner circuit circulating water and can be used sustainably. The relative evaporation of spray water is less, which protects the environment to a large extent.

5. Longer service life: Our company adopts higher quality inspection standards in the industry, which greatly improves the corrosion resistance. The proper service life is usually more than 10, and the later maintenance and cost are lower.

Oasis Bingfeng BFL series closed cooling tower products adopt advanced cooling methods, and optimize the equipment structure and materials to make the products more efficient, more energy-saving, more environmentally friendly, better overall stability, and more cost-effective!

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