Colder Water, Cooler Air: The Impact on Cooling Efficiency in Air Units

In summary, the conversation discusses the potential benefits of using colder water in an air unit to improve its cooling capabilities. The participants agree that a greater water-air temperature difference will result in cooler air and better heat transfer. This is known as improving the "approach temperature" and can lead to a 1 degree Celsius increase in the delta T and potentially 8 degrees Celsius return water. However, it is noted that this may have a negative impact on the chiller's approach temperature. The calculation of the total effect in Watts is not discussed.
  • #1
TSN79
424
0
If a cooling element in an air unit was designed for water temperatures of 7C in and 12C out, how much "better" will it become if it receives water at 2C ? Let's say the return is then 7C, will the effect then be the same since the delta T is the same as it was with 7/12 ? It just seems so logical to me that bringing colder water in will result in cooler air...
 
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  • #2
Correct, although you won't get quite 5C colder air, the greater water-air temperature difference will cause more heat to flow but it will also increase the effects of anny thermal resistance.
 
  • #3
This is called improving your "approach temperature". A bigger approach temperature will improve heat transfer and therefore you will pull more energy out of the air. So the delta T will go from, say, 5 C to 6C and you'll get perhaps 8 C return water. Of course, the approach temperature of the chiller that is making that water gets worse when you do that...
 
  • #4
Thx guys, just one more thing; if this will indeed make the air cooler, how can I calculate the total effect in Watts?
 

Related to Colder Water, Cooler Air: The Impact on Cooling Efficiency in Air Units

What is the relationship between cooler air and colder water?

The relationship between cooler air and colder water is that they can both have a cooling effect on each other. When cool air passes over the surface of colder water, it can absorb heat and become even cooler. Similarly, when cold water evaporates into the air, it can lower the air temperature.

Why does cooler air feel colder with colder water?

Cooler air feels colder with colder water because of the transfer of heat energy. When the air is cooler, it has less heat energy and can absorb more heat from the colder water, making it feel even colder. Additionally, the evaporation of cold water into the air can also contribute to the cooling effect.

Can colder water make the air too cold?

Yes, colder water can make the air too cold. When the air temperature drops below freezing, the cold water can freeze on surfaces, leading to icy conditions. This can also create a dangerous situation for humans and animals, as the body can lose heat faster in extremely cold air.

How does the temperature of water affect the air temperature?

The temperature of water can affect the air temperature through various processes. When the air is cooler than the water, it can absorb heat from the water and become cooler. On the other hand, when the air is warmer than the water, it can transfer heat to the water and warm it up. Additionally, the evaporation of water can also impact the air temperature.

What are the impacts of cooler air and colder water on the environment?

Cooler air and colder water have various impacts on the environment. They can contribute to the formation of clouds and precipitation, which are essential for the water cycle. They can also affect the growth and migration of plants and animals, as well as regulate the Earth's overall climate. However, extreme temperatures can also have negative impacts, such as damaging crops and causing natural disasters.

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