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1. Principle of Work
SCF closed circuit cooling tower is a piece of highly efficient heat exchange equipment that is designed and made using sophisticated heat-exchange technology.
The air enters through the inlet in the bottom of the cooling tower, which is in an alternating counter-flow direction with spray water falling down, forming saturated vapor in this process. The heat is exhausted out of tower by the fan and the water is collected to bottom tank and circulate continuously by the special evaporator. As there is no heat transfer padding inside the closed circuit cooling tower, more space is saved to increase coil's radiating area. This is suitable for cooling applications where the outlet water temperature is required to be close to the wet bulb temperature.
(1). The efficient water eliminator is made of PVC, which is radiation resistant and long lasting. It can filter the drips from discharged air streams.
(2). Water is pumped over the evaporative coil surface area at 3.2l/m2 to ensure continuous wetting of the primary heat transfer surface which enhances heat transfer efficiency and minimizes fouling and scale formation
(3). For applications that might deposit soluble scale or sludge within the tubes, the cleanable header tube bundle provides removable cover plates.
(4). Easy removable air inlet grating avoids direct sunlight and prevents dust and dirt from entering the closed circuit cooling tower.

2. Parameters of SCF Counterflow Closed Circuit Cooling Tower

3. Advantages
The closed circuit cooling tower provides many operational and maintenance benefits to the user by keeping the process fluid in a clean, closed loop.
(1). Protect process fluids from contamination.
(2). Maximize system efficiency by reducing fouling.
(3). Reduce system energy costs.
(4). Reduce system maintenance costs.
(5). Provide reliable, efficient, year-round operation.
As a result, our SCF closed circuit cooling tower is a product of choice for users.

4. Engineering Considerations
Location Requirement
SCF closed circuit cooling tower must have an adequate supply of fresh air to all air inlets. When units are located adjacent to building walls or in enclosures, care must be taken to ensure that the warm, saturated discharge air is not deflected and drawn back to the air inlets.

Think about the Compatibility of Fluid
The fluid to be cooled must be compatible with the coil material. Fluids not compatible with coil materials can lead to coil corrosion and failure. Certain fluids may require occasional pressure cleaning or mechanical cleaning of the inside of coil. In such cases, the coil must be designed to provide this capability.

Piping and Valves
Piping size and installation must be in accordance with good piping criterion. All piping should be supported by pipe hangers or other supports, not by the closed circuit cooling tower. External shut off valves may also be required if the system design necessitates the isolation of individual tower cells.

Capacity Control
In general seasons, the performance of most closed circuit cooling tower will vary due to the change of its environmental wet bulb temperature. Therefore, when the change of environmental temperature leads to the difference of liquid temperature, in this case, capacity control will be required.
Fan periodicity operation is the simplest method of capacity control for our closed circuit cooling towers, normally used in multi fan unit system or multi cell unit system. In some circumstances of low requirement on outlet water temperature control, fan periodicity operation can meet with temperature control requirement, and also, is easy to handle. Using two-speed fan can provide substantial energy savings when compared to simple fan periodicity operation.
How to Prevent the Closed Circuit Cooling Towers from Freezing? (Very Important)

Protection against Coil Freezing
At below freezing ambient temperatures, the closed circuit cooling tower can experience heat loss even when the circulating spray water pump and fans are not operating. Without a heat load on the circulating fluid, coil freezing can occur even at full flow. Protective measures are readily available to avoid potential freezing problems. Where the system will permit, the best protection against coil freezing is the use of an anti-freeze solution. When this is not possible, the system must be designed to meet the following conditions: Maintain a heat load on the circulating fluid so that the temperature of the fluid leaving the coil will not fall below7℃.

Attached: Mixture Ratio of Antifreeze Liquid (For example glycol)

5. High Quality Parts
(1) Imported Galvanized Steel Sheet
The shell of the cooling tower uses imported galvanized steel sheet, which offers great corrosion resistance, heat resistance and aesthetic appearance. In addition, the galvanized steel sheet lasts 3-6 times longer than ordinary galvanized plates.

(2) Electronic Scaling Apparatus
The enclosed circuit cooling tower is equipped with advanced electronic scaling apparatus, which can do antiscale, contaminant separation, sterilization and algae removal through the use of electronic pulse technique. The only thing you need to do is Connect 220V power, and then it will deal with the recycled water, which effectively prevents the formation of dirt on both coil walls and padding.

(3) Circulating Water Pump
The circulating water pump uses quality mechanical seal that is not restricted by the direction of rotation. It offers long lifetime, no leakage, low power, high flow rate, low noise, and other advantages.

(4) Propeller Fan
The ventilation system uses a special propeller fan with aluminum alloy blade, featuring front tipping blades, streamlined entrance wind-cone, nor-pulley driven structural design and totally enclosed self-cooled motor with low noise. It has such advantages as light weight, small size, good starting performance, reliable operation and high durability.

(5) Heat Exchange Coils
The forward flow type coils are made of high-quality steel pipes; counter flow type coils are made of quality elliptical steel pipes. The design pressure is 2.0MPa. In order to ensure 100% qualified welding quality, 2.0MPa airproof tests are conducted at coil-shaping stage and assembly stage, and the whole pipe bundle has undergone a hot-dip galvanizing treatment.

(6) Water Dispatching System
The cooling water spray system uses high-flow-rate and ant-clogging basket type nozzle to ensure water can be continuously sprayed on the components of the coil. Under the help of induced air, water can thoroughly cover all the coils to facilitate the complete heat exchange among water, air and refrigerant. In this case, heat transfer efficiency will increase dramatically. The nozzle is connected on spray pipe branch, which can be easily removed for convenient cleaning.

(7) Dismountable Water Dehydrator
The dehydrator of the cooling tower is made of corrosion resistant PVC material. The special structure can get rid of the humid air moisture coming out from the coil pipe by means of changing the air current 3 times, making the water leakage rate as low as 0.001%. It is very convenient to disconnect the dehydrator when we do the cleaning.

(8) PVC Padding Heat Exchange Layer
SCF closed circuit cooling towers adopt PVC honeycomb type padding. The short horizontal air-inlet design can help the cool air and water do heat exchange to the utmost extent. In addition, the padding can bear the water up to 68℃, and has the advantages of good flame-retardant performance, ageing resistance, deformation resistance and low wind resistance coefficient, etc.

6. Warranties
When purchasing our SCF closed circuit cooling tower, please refer to applicable and effective warranties as well as the restrictions.

We are a specialized closed circuit cooling tower manufacturer and supplier in China. We provide various types of refrigeration equipment such as closed circuit cooling tower, evaporative condenser, thermosiphon dry-mode evaporator, and ammonia oil separator.

Related Names
Counter Flow Enclosed Cooling Column | Upstream Closed Type Cooling Facility | Counter-current Potted Cooling Tower | Counter-flow Closed Chimney Cooler