The cooling tower is nothing but a device used to reduce the heat and increase production efficiency. In simple words, it is used to cool industrial hot water. Its size ranges from tiny to massive towers based on the requirement.
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A cooling tower's main function is to remove heat from water by evaporating a little amount of it. The mixture of warm and cooler water leads to latent heat evaporation causing the water to cool. A commercial cooling tower has an average life expectancy of 15-20 years.
Several industries use a cooling tower, such as chemical manufacturing plants, primary metals processing plants, petroleum refineries, rubber products manufacturing plants, tobacco manufacturing plants, glass manufacturing plants, and textile manufacturing plants.
The cooling tower provides high cooling efficiency, needs less maintenance, consists of reliability and sustainability, and can be operated for a longer duration. Now, let us have a look at a few questions that will help you get clear with the idea behind cooling towers.
1. What is a cooling tower?
A cooling tower is nothing but a heat exchanger. It extracts waste heat to the atmosphere by cooling the water stream to a lower temperature. Water begins to cool when it comes into contact with air. In this way, the same amount of water is evaporated and thereby cool down the hot water.
2. What are the different types of cooling towers?
There are two types of cooling towers:
3. What is an Evaporative cooling tower?
Cooling is provided via an evaporative cooling tower based on a design wet-bulb temperature. This cooling tower can cool water to 85 degrees Fahrenheit. It is the most economical option for cooling a large amount of water.
4. What is entering wet-bulb temperature (EWBT)?
EWBT is nothing but a device that measures the level of humidity in the air entering the cooling tower. The higher the temperature of the wet bulb, the more moisture exists in the air. The cooling tower needs to be larger with a high wet-bulb temperature compared to a lower wet-bulb temperature.
5. What is the difference between 'counterflow' and 'cross flow' cooling towers?
In a counterflow cooling tower, air travels vertically upwards through the fill and makes intimate contact with water. Hence, both air and water are in opposite directions. In a crossflow tower, air passes through the fill horizontally, crossing the downwards water flow.
6. Why choose the FRP cooling tower?
FRP (fibreglass reinforced polyester) is mixed with a gel coating that protects the cooling tower from direct UV rays. Additionally, it also provides a higher resistance to rot and decay to all FRP portions. Hence, FRP cooling tower manufacture is considered in extreme climate conditions.
7. How do Cooling Towers Operate in Cold and Sub-zero Weather?
In cold weather, the cooling tower is operated with a heat load. The operating water flow is directly bypassed to the cold-water basin to prevent icing if the heat load drops too low. The water flow is maintained over the cooling tower.
8. What is the difference between a 'Force Draft' and 'Induced Draft' cooling tower?
A Force-draft cooling tower imparts an agitation system that forces air into the tower, and fans are positioned on the side of the cooling water. Meanwhile, induced draft tower works by pulling air from the building and fans are located on the top of the cooling tower.
9. How is Water Loss Calculated in Cooling Tower?
There are three types of water loss in the cooling tower: drift, evaporation, and blowdown. Drift loss is while circulating water for the natural draft tower. Evaporation loss is simple as it sounds, water loss due to evaporation. Blowdown loss is during circulating water that lowers the concentration of solids.
10. What is Cooling Tower Drift?
Drift is undesirable loss of water to the environment through tiny, unevaporated droplets in the existing cooling tower stream. These water droplets carry minerals, microorganisms, debris, and chemicals from the circulating water. Hence, it potentially impacts the environment.
11. What is the regulating organization for cooling tower technology, and where can you learn more about the cooling tower industry?
There's a worldwide industry named Cooling Technology Institute (CTI) authorized on cooling tower technology. In this institute, there are manufactures, owners/operators, and supplies providing facilities for the cooling tower. Moreover, you can get more information on CTI guidelines and specifications on the CTI site.
12. How to clean Air Inlet Louvers of Cooling Tower?
The best method to remove the minerals from the air inlet louvres is to remove the louvre equipment and let them soak in the cold-water basin of the unit. The chemicals present in the water treatment unit will neutralize and dissolve the minerals buildup. The time depends on the severity of the buildup.
Hello,
Its time for some updates on the subject. None of this is new, just new to me.
I want to make it clear, the Cross flow open coolant system works, and if the radiator cap is working and the recovery tank coolant level is kept adequately for cool down return, and all the functions of the radiator cap are working, the open loop system works very well.
My reading about the merrits of the closed loop system has convinced me that the purpose of it is to eliminate many of the points of failure of the radiator cap.
My research has also shown that plastic expansion tanks and the pressure caps can have a high failure rate, depending on quality. These can have a greater failure rate than an open system. A plastic expansion tank will leak from its seams and caps will fail allowing boil-off. You should usually see evidence of this from pooling or seeing coolant level loss in the tank. When possible, buy OEM quality for these.
Another option is use a metal surge/expansion tank and pressure cap. These have the advantage of absolute reliability and caps are available in a variety of pressure rates.
The open system can be a silent killer failing to drawback overflow or a cracked cap gasket letting loose at the worst possible time. (ask me how I know)
Pick your poisons.
The only engines Caterham have used open systems on have been the Kents.
I am not pursuing a metal tank now but if I did,
https://www.carbuilder.com/uk/horizontal-header-tank-bottom-brackets
https://www.carbuilder.com/uk/horizontal-header-tank-rear-brackets
And there are other good tanks.
Moving on...
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I have sourced some new parts for the closed conversion:
Amazon, of course
And:
Fiesta Mk2/3/4 PN:
Samco Sport Hose kit:
The hose kit comes with 3'7" x 5/8" heater hose, perfect for the smaller expansion tanks. That length is the length from the rad mount to the footwell shelf edge. Maybe a little short for a scuttle mounted bottle to a lower hose Tee, but adequate for anywhere else. No top bleeder hose.
https://samcosport.com/product-category/car-kits/caterham-7/
Lets discuss this tank, the Rover series 200 & 400, PN: EAP, and its cap, Rover PCD.
It was used by Caterham on the K Series, Sigma and early Duratecs and mounted on the front top chassis cross tube. It's a fine tank but I found the Crossflow is mounted too far forward to use it on the provided brackets. The hoses would be touching and there may be a height problem too. If mounted high enough to clear the Fiesta TH, would it clear and fit under the nose?
Plenty of room for the K
Others have been able to use the 200/400 tank on the scuttle.
Notice the cap appears to not be the standard Rover cap.
Notice the fiesta thermo housings used.
Where do those "7" branded cases come from?
I like this Rover 200/400 tank but it's getting hard to source.
The pressures for the Rover caps are ideal, in the 100 bar, 16 psi range, and the mid point fill volume is 20oz. I would prefer a taller and narrower tank to keep slosh away from the cap. 5/8" outlet.
Failing other options,I will use it.
The Rover 600:
Used by Caterham and Lotus. Uses aforementioned Rover cap.
Also used on the Lotus Elise. There's your cool Lotus connection.
I really like this tank, but those stubby legs are worrisome to me.
Cat parts still has the bracket
The 600s close cousin, the Rover 25:
Longer legs are probably an improvement.
The ubiquitous Land Rover Freelander:
Used by CC on everything after the Rover 600 tank.
The mount for this crews into the boss in the center of the top cruciform.
You always wondered what the was for, didn't you?
There are other options..
The Westfield standard appears to be Opel Corsa:
The Dacia Duster / Renault Kangoo
I heard from one other L7C member that uses this tank on his/hers BDR.
21psi cap.
I found some other miscellaneous Crossflow applications:
Birkin, I believe. Anyone know this tank?
As for how to plumb, the tank flow is top to bottom. The top inlet nipple is usually plumbed to a high point such as a radiator air bleed or thermostat housing.
The bottom outlet is usually plumbed to the cold side between the radiator and pump inlet. It needs to be on a suction part of the circuit where coolant will be drawn out of the tank and thus, pulling air & coolant from the bleed hose location which no longer needs to be the high point, but it helps.
On a Crossflow, if the pump heater inlet pipe is available, use it. If a heater is plumbed, tap into the return hose going to the pump. If running a straight line from the carb manifold to the pump, tee into that. But not if using a coolant controlled carb choke. If neither heater circuit is available, tee into the lower radiator hose.
Because an expansion tank is never completely filled, the air gap retains the purged air (closed) and excess pressure is vented out the cap, which should be the highest point of the system.
The coolant is allowed to expand and retract and contain sudden acceleration surges within in this vessel.
In the UK, Crossflow closed system kits have been sold by Arrowstar and James Whiting.
Contact us to discuss your requirements of Counterflow Fill. Our experienced sales team can help you identify the options that best suit your needs.