Are spray-type heat exchangers and water-cooled radiators the same type of heat exchanger? What is the relationship between the heat transfer coefficient and the degree of water spraying?
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Are spray-type heat exchangers and water-cooled radiators the same type of heat exchanger? What is the relationship between the heat transfer coefficient and the degree of water spraying?
As I understand it, the spray type may be in the form of tubes, but tubes do not necessarily mean a spray system; the definition of a spray-type heat exchanger is that the fluid flows inside the tubes, while the cooling water flows in the upper tank and spreads over the coiled tubes in a film-like manner. The heat released by the material is transferred to the water film through the wall of the tube, and from there it is transferred to the air; the heat is then carried away by natural convection of the air. A small amount of heat is carried away through water evaporation. In cold storage, the exhaust pipes in the evaporator section are not in the form of nozzles. Simply put, the spray system is water-cooled, but that’s not necessarily the case for the exhaust pipes; they may also be air-cooled
Water cooling radiators work in a similar manner to radiators used for heating, by increasing the number of fins to expand the heat exchange surface area; they rely on radiant heat transfer, and are the preferred choice for players who need high-performance CPUs. The spray type, on the other hand, achieves heat and moisture exchange through multiple nozzles, which is a phase-change heat transfer process. As for the water spray rate, I don’t really remember having seen this term before, so I’m not aware of its relationship with the heat transfer coefficient. Looking forward to experts' guidance.
In the approximate calculation of a spray-type heat exchanger with film formation and downward flow outside horizontal tubes, the external heat transfer coefficient is taken to be proportional to the 1/3 power of the spray density
In ammonia synthesis, the water-cooled exchanger is a spray-type heat exchanger.