Experimental Analysis Study On Performance Of Heat Transfer & Pressure Drop Of Fin-and-tube Exchanger

With the rapid development of computer technology, computer processing speed is more and more faster, heat load of data center is also increasing, the air conditioning is more and more widely used in data center. Current data center integration trend more and more obvious, heat load of data center equipments have great diversity and complexity, including time variation diversity, space complexity. It requires us to adapt to this trend when we design a data center refrigeration system, which can provide dynamic refrigeration and can meet the demand of diversity and complexity.This article is based on China's data center air conditioner market size will continue to increase and to enhanced heat transfer technology as a main means of improving air conditioning performance. Heat transfer studying is under different inlet water temperatures based on using wavy fin-and-tube and louvered fin-and-tube heat exchangers respectively. Threlkeld method based on enthalpy difference under wet condition is chose to process test data, we can get following conclusions:1)Found a fin-and-tube heat exchanger airside characteristic test method based on the experiment conditions and objects. All test parameters error range were within ±15%.2)According to the experimental data, respectively studied heat transfer and pressure drop characteristics of using hydrophilic wavy fin-and-tube and louvered fin-and-tube heat exchangers under dehumidifying conditions. Analysis the impact of heat transfer and pressure drop characteristics of air side in different inlet water temperature, respectively build heat transfer correlation and pressure drop correlation of two types of exchangers.3)As the inlet water temperature rising, the airside heat transfer factors are increase of two types of different fins, the factors difference are small, changing trends is same.4)As the inlet water temperature rising, the airside friction factors are reduction of two types of different fins, the former friction factor is 1.5 times of the latter.5)From two types of fins experimental values compared with predicted values of transfer factor and friction factor can be found: the heat factor is a little difference of experiment values and forecast values; while the friction factor is match well of experiment values and forecast values, but forecast values are well distributed in the 15% area.6)Two types of fin-and-tube heat exchangers indicate that effect of different inlet water temperature on heat transfer factors is larger than the effect of different inlet water temperature on friction factor. Finally, the author briefly summarizes the shortcomings of this studying and prospect of the next research work.