SCF Closed Circuit Cooling Tower

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.

Model	Nominal flow rate (m³/h )	Fan power (kw)	Air flow (m³/h)	Water pump power (kw)	Spray water (m³/h)	Pipe-connecting size (mm)	Approx. weight (kg)		Dimensions L×W×H(mm)
							Shipping	Operating
SCF-30	32	4	60000	1.5	45	65 (2)	3150	3880	1850×2410×4225
SCF-40	43	5.5	65000	1.5	45	80 (2)	3450	4290	1850×2410×4225
SCF-50	52	5.5	75000	2.2	65	80 (2)	3980	5100	1950×3030×4265
SCF-60	64	7.5	75000	2.2	65	100 (2)	4450	5500	1950×3030×4265
SCF-70	72	4(2)	60000 (2)	3	95	100 (2)	5150	7980	3590×2410×4225
SCF-80	85	5.5(2)	65000 (2)	3	95	125 (2)	5880	8250	3790×2610×4965
SCF-100	109	7.5(2)	72000 (2)	4	125	125 (2)	6280	8900	3790×2610×4965
SCF-125	135	5.5(2)	75000 (2)	4	125	150 (2)	6650	9100	3790×2610×4965
SCF-150	156	7.5(2)	87000 (2)	5.5	165	150 (2)	6950	9850	3790×3030×4965
SCF-175	182	7.5(2)	87000 (2)	5.5	165	175 (2)	7890	10900	3790×3030×4965
SCF-200	211	7.5(3)	75000 (3)	5.5	165	175 (2)	8550	11200	5330×2410×4825
SCF-250	260	7.5(3)	87000 (3)	7.5	210	200 (2)	9360	12100	5630×2610×4965
SCF-300	315	7.5(3)	100000 (3)	7.5	210	175 (4)	11600	13100	6000×3200×4965
SCF-350	359	7.5(4)	100000 (4)	5.5 (2)	165 (2)	175 (4)	13900	15800	8050×3200×4965
SCF-400	412	11(4)	125000 (4)	7.5 (2)	210 (2)	175 (4)	14900	18900	8050×3500×4965
SCF-500	522	7.5(6)	87000 (6)	7.5 (2)	210 (2)	200 (4)	16900	23900	5630×5250×4965
SCF-600	619	7.5(6)	100000 (6)	7.5 (2)	210 (2)	200 (4)	21500	26200	6000×6450×4965
SCF-700	730	7.5(8)	100000 (8)	5.5 (4)	165 (4)	175 (8)	23100	31900	8050×6450×4965
SCF-800	825	11(8)	125000 (8)	7.5 (4)	210 (4)	200 (8)	27800	37800	8050×7050×4965

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)

Glycol (wt %)	0	10	20	30	40	50	58	80	90
Freezing point (℃)	-0.0	-3.5	-8	-15	-24	-36	-48	-47	-29

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.