As far as I understand from the video, the adiabatic coolers work the most efficiently in moderate to warm climates but the air should be dry. This is because you want to lower the air temperature by forcing it to reject heat as much as possible to the evaporation process of the water mist from the sprayers. The dryer the air the more extra moisture it can "carry", the more heat it can reject, and subsequently the lower temperature it will achieve.
Many thanks for your question Anuraj. For a fixed heat load and water temperatures the efficiency of a cooler can be affected by a number of things: 1) The rpm of the fans pulling the air through the heat exchange coils - the slower the fan speed, the more efficient the cooler. This is because variable speed fans reduce the power consumption to the cube of the speed of the fan (so, if the fans are running at 50% of their maximum speed, their input power will be 0.5³ or 12.5%). However, with slower fans comes a higher upfront CAPEX cost and your ROI will depend on how many hours per year the equipment runs. 2) The gap between your required water outlet temperature from the cooler - in this video we give the example of cooling to 38°C with a 35°C dry bulb temperature - for a dry cooler, this only gives a 3°C cooling window meaning that maximising efficiency is very difficult. However, if we were to size an adiabatic cooler for the same conditions we would reduce the inlet air temperature to circa. 23°C which increases the cooling window to 15°C which is a massive percentage increase. This means that the adiabatic cooler needs less airflow / fewer fans to achieve the same performance, giving much greater efficiency at maximum design conditions and a smaller equipment footprint. As the video states, if you want to achieve water temperatures below dry bulb air temperature then you have no choice but to use an evaporative adiabatic cooler as it is not possible to do this with a dry cooler. I hope this helps, please feel free to email us or leave a reply if you need anything else.
@@ANU31313 You can do calculations. Theoretical limit is reached with Relative Humidity. If you can no longer add humidity to air - you can not cool it down further.
Hi @@ANU31313 Our adiabatic coolers can generally cool the water to within 5°C of the wet bulb temperature. So, in your example, as long as the wet bulb temperature doesn't exceed 27°C, the answer is yes. The dry bulb largely dictates how much water the adiabatic cooler will consume and the wet bulb dictates what water temperature we can achieve. I hope this helps.
Hi Bailor, Thanks for your comment. As with any product, there are those that will take great care in the initial development and design and the continuous improvement of their products. There will also be those who rush unreliable products to market minus the correct development. The automotive industry is a great example of how differing levels of development can affect a product’s operation and it’s longevity. All cars will get you from A to B for a period but how long that period is will, on average, be dictated by the experience of the manufacturer and amount of effort put into their designs. At Transtherm, we have been manufacturing heat exchange products for over 3 decades and adiabatic coolers for over 2 decades. In that time, we have supplied thousands of coolers and have had fantastic product reliability and longevity. Equally, we have witnessed the problems with other adiabatic coolers, hybrid coolers and cooling towers owing to poor design and mistreatment in the field. 9 times out of 10 the problems occur for one of the following reasons: 1. Excessive evaporative cooling is used as control systems are manipulated (this is not possible with Transtherm PLC based controls) 2. There are a small number of large spray nozzles pointing directly at the coil face, creating wetted surface cooling (Transtherm use a larger number of smaller nozzles and direct them counter-flow to the air stream in order to minimise the possibility of wetted surface cooling)
@@transthermcoolingindustrie4548 I’m guessing this is some sort of auto reply because I said the word “problem” but I was making a joke about engineering homework.
@@BailorTheSailorMan Thanks for your comment. Nope, that wasn't a auto reply, we do take every comment seriously :) We hope you enjoy our content. Wish you have a great day ahead
Your Adiabatic Coolers would be a perfect application for a data center located in a tropical climate, correct?
As far as I understand from the video, the adiabatic coolers work the most efficiently in moderate to warm climates but the air should be dry. This is because you want to lower the air temperature by forcing it to reject heat as much as possible to the evaporation process of the water mist from the sprayers. The dryer the air the more extra moisture it can "carry", the more heat it can reject, and subsequently the lower temperature it will achieve.
Thnxs more
In that case, it doesn't feel like the dry cooler is very useful, only dropping about three degrees.
how the dry cooler is less efficient than the adiabatic coolers?
Many thanks for your question Anuraj.
For a fixed heat load and water temperatures the efficiency of a cooler can be affected by a number of things:
1) The rpm of the fans pulling the air through the heat exchange coils - the slower the fan speed, the more efficient the cooler. This is because variable speed fans reduce the power consumption to the cube of the speed of the fan (so, if the fans are running at 50% of their maximum speed, their input power will be 0.5³ or 12.5%). However, with slower fans comes a higher upfront CAPEX cost and your ROI will depend on how many hours per year the equipment runs.
2) The gap between your required water outlet temperature from the cooler - in this video we give the example of cooling to 38°C with a 35°C dry bulb temperature - for a dry cooler, this only gives a 3°C cooling window meaning that maximising efficiency is very difficult. However, if we were to size an adiabatic cooler for the same conditions we would reduce the inlet air temperature to circa. 23°C which increases the cooling window to 15°C which is a massive percentage increase. This means that the adiabatic cooler needs less airflow / fewer fans to achieve the same performance, giving much greater efficiency at maximum design conditions and a smaller equipment footprint.
As the video states, if you want to achieve water temperatures below dry bulb air temperature then you have no choice but to use an evaporative adiabatic cooler as it is not possible to do this with a dry cooler.
I hope this helps, please feel free to email us or leave a reply if you need anything else.
@@transthermcoolingindustrie4548 if the ambient is 46 deg c and needs the water outlet needs 32deg c is it possible?
@@ANU31313 You can do calculations. Theoretical limit is reached with Relative Humidity. If you can no longer add humidity to air - you can not cool it down further.
Hi @@ANU31313
Our adiabatic coolers can generally cool the water to within 5°C of the wet bulb temperature.
So, in your example, as long as the wet bulb temperature doesn't exceed 27°C, the answer is yes.
The dry bulb largely dictates how much water the adiabatic cooler will consume and the wet bulb dictates what water temperature we can achieve. I hope this helps.
So its just a gaint swamp cooler
So this is that thing from all the example problems...
Hi Bailor,
Thanks for your comment.
As with any product, there are those that will take great care in the initial development and design and the continuous improvement of their products. There will also be those who rush unreliable products to market minus the correct development.
The automotive industry is a great example of how differing levels of development can affect a product’s operation and it’s longevity. All cars will get you from A to B for a period but how long that period is will, on average, be dictated by the experience of the manufacturer and amount of effort put into their designs.
At Transtherm, we have been manufacturing heat exchange products for over 3 decades and adiabatic coolers for over 2 decades. In that time, we have supplied thousands of coolers and have had fantastic product reliability and longevity.
Equally, we have witnessed the problems with other adiabatic coolers, hybrid coolers and cooling towers owing to poor design and mistreatment in the field. 9 times out of 10 the problems occur for one of the following reasons:
1. Excessive evaporative cooling is used as control systems are manipulated (this is not possible with Transtherm PLC based controls)
2. There are a small number of large spray nozzles pointing directly at the coil face, creating wetted surface cooling (Transtherm use a larger number of smaller nozzles and direct them counter-flow to the air stream in order to minimise the possibility of wetted surface cooling)
@@transthermcoolingindustrie4548 I’m guessing this is some sort of auto reply because I said the word “problem” but I was making a joke about engineering homework.
@@BailorTheSailorMan
Thanks for your comment.
Nope, that wasn't a auto reply, we do take every comment seriously :) We hope you enjoy our content.
Wish you have a great day ahead