I've made simple comparision of radiator frontal area. Just a basic data, but if put everything in one place, can lead to interesting conclusions.
What is important to read these numbers:
frontal area =/= surface area
These values are not the same, but if we assume we compare radiators within same class (same thickness, same fpi (fins per inch density), same type and build quality (ideally same manufacturer), they can scale accordingly.
Another factor is flow rate, caused by radiator restrictions. This also changes with radiator size, but often wider radiators have lower restrictions (better), at least if we consider conventional radiator type (not rad with tubes like mo-ra series).
Final thing are fans, there is lack of good tests of larger fans. What we know today, is that 120mm fans have best parameters, and best 120mm fans (especially to use with radiators where static pressure is deciding factor) outperform 140mm fans. But these differences are not that dramatic, and each new fan model that appears on market can change it. Same goes for larger fans 180mm, and 200mm, we can assume they are slightly worse than equal area of 120mm fans, but it depends on quality. At the moment nobody knows, that for example gentle typhoons (one of the best 120mm fans in terms of pressure/noise ratio) beat all most popular 180mm fans. We can only guess here, but even if it does, it only gives some edge to 120mm fans, that has to be taken into consideration.
So taking all these factors into account, and some more, such as - larger rads due to different amount of water canals, are not exactly a scaled version of smaller ones, so water behaves differently inside these rads, that can cause difference in performance.
But if we assume we compare radiators considering all previously mentioned points, same brand, same thickness, same fpi, a decent quality fans, we can use this graph to give us at least some idea about how performance will scale.
There is lot of variables that can change it, so don't treat this as performance chart. It should be used carefully, always including other factors impacting radiator performance.
I use 120x120mm radiator as reference, since it is most common type.
Conclusions:
1. 3x120 (360) radiator has only ~10% higher frontal area than 2x140 (280)
2. 3x140 (420) radiator has about same frontal surface (2% more) as more popular 4x120 (480), which is 60cm longer, making it difficult to fit on top of many popular cases
3. 180mm radiators have much better frontal area than 120 (125%) and 140 (65%) rads
4. Single 180mm radiator has larger frontal surface than 240 (2x120) by 12,5%
5. 2x180 radiator, that can fit in several popular cases, is only length of regular 360, but has frontal area of four and a half 120mm rads (50% more than 360, 12,5% more than 480)
6. 3x180mm radiator beats king of conventional (long) radiators, 560mm (4x140), in terms of frontal area, by 24%.
7. single 200mm radiator, has frontal surface area close to a 360 (missing 8%), and is slitghly better than 280 (2x140)
8. Large square external radiators 9x140 (1260), have 36% higher frontal surface area than 9x120 (just like single 120mm vs 140mm), thus if external seems to be worth it (size does not matter that much), even used with four 200mm fans, over classic 9x120 used with 4x180mm fans. Frontal surface gain for a 9x140mm over 9x120mm is more than one extra 360 radiator.
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