What surface cooler? What is the difference between it and a tubular heat exchanger?

I don’t know how to answer; definitions vary and device structures differ. Search online – there are pictures and explanations available.

Is air cooling a surface cooler? This should also belong to the tubular type.

A surface evaporation-type condenser is a highly efficient and energy-saving heat exchange device that utilizes the evaporation of a water film sprayed on the outer surface of the heat exchange coil (with forced convection air generated by an exhaust fan carrying away the water vapor) to absorb the heat from the fluid inside the tube, thereby enabling the fluid within the tube to be condensed. The main mode of heat exchange is the latent heat of the water being used for heat exchange; evaporation of the water film on the outer surface of the tube drives heat transfer, thereby cooling (or condensing) the fluid inside the tube. To achieve the best results in terms of comprehensive energy and water savings, reduced floor space, and low costs, an optimized combination is used, where one power source performs two functions: the main evaporation cooling process and the auxiliary wet air cooling process. 1) Heat transfer is achieved through the latent heat of vaporization; only about 1% of the water evaporated by the water cooler is required to remove the same amount of heat. 2) The water circulation rate for the water-cooled type is 10%–30%, and the water circulates only within the equipment; the power consumption of the pump is only 1/8–1/4 of that of the chiller + cooling tower system. This eliminates the need for a cooling tower as well, thereby reducing the energy consumption associated with system circulation. 3) The cooling task for a combination of air cooling and water cooling is accomplished within a single device (it is even possible to achieve temperatures lower than those obtained with water cooling: the cooling temperature approaches the wet-bulb temperature, being 3–6°C lower than that achieved by water cooling, and 10–30°C lower than that achieved by air cooling). ）

The principle of a surface cooler is to allow the refrigerant or cooling medium to flow through the interior of metal tubes, while the air to be cooled flows over the outer walls of these tubes, thereby enabling heat exchange and achieving air cooling. Both plate heat exchangers and tube heat exchangers are surface-type heat exchangers, in which the cold and hot fluids do not come into direct contact. In other words, a tubular heat exchanger is a type of surface cooler.

What’s explained on the 5th floor is still understandable