Optimization And Simulation Analysis Of Dew Point Evaporative Cooling Heat Exchanger

The energy consumption of air conditioning is the most important one in the building energy consumption. The existing mechanical compression refrigeration is not only consuming large amounts of energy, but also its refrigerant working severe damage to the atmosphere.As a new kind of cooling mode at present,indirect evaporative cooling is getting more attention with its advantages of more energy-saving and environmental protection,which remains the humidity unchanged in the processing of reducing the air temperature. But the way just treats the air temperature to the wet bulb temperature, that can’t meet the demand of indoor thermal comfort. The dew-point cooling technology, can cool the air to the wet bulb temperature and fall to near the dew point temperature,which is based on the original indirect evaporative cooling technology,while can achieve greater cooling effect. But,the dew-point cooling technology is mostly used to pre-cooling in the application of the central air conditioning,and huge volume and mostly installed outside. Therefore cannot be widely used in household refrigeration. Based on the above several disadvantages, this article designs a new small kind of dew point evaporative cooling heat exchanger, optimizing the structure, multistaging the cooling style, and studying the various parameters which affects the efficiency of the cooler, and that makes the dew-point cooling way been widely used.First,compared with the ordinary evaporative cooling technology,it is proved that the dew-point cooling technology dose good to environmental protection and energy saving.Second analysis the advantages of plate heat exchanger and fluid counter-current flow in heat exchange aspect, from the perspective of theory. This article constructs the plate and counter-current cooling heat exchanger, greatly enhances the heat transfer effect between the fluid. Compared to indirect evaporative cooler and traditional dew point cooler,this article mainly puts forward to build the multistage cooling by the way that set up a variety of different forms of perforation on the heat exchanged surface and set up the channels such as axis-symmetric periodic arrangement of core body on the structure. At the same time, design the whole structure of the cooler,which including the import and export. Given the basic thermodynamic conditions,the outdoor air as the working medium is adopted to get initial design data,and finally uses the CAD Pro/E to complete cooler model by 1:13d modeling.For structure optimization of the dew point cooler in this paper, theoretical analysis of the basic assumptions and thermal analysis method is given.And analysis the influence of the relationship between the thermal design parameters, study the mathematical model of evaporative cooling, and complete the theory of thermal analysis of the dew-point coolingUsing CFD FLUENT software to simulate the internal temperature field, concentration field and velocity field in the three-dimensional body of the cooler,and make analysis on the perforation type, channel height and air inlet velocity, inlet temperature and relative humidity and other factors,and then do further work to complete optimization design and simulation of dew-point cooling heat exchanger under the expected condition,and aim to verify that the scheme is feasible. In this paper,the performance of the dew-point cooler is good.The dew point efficiency under the expected stability condition, increased by 2.4% compared with the expected efficiency of the traditional structure.