Experimental Research On Combined Air-conditioning System Based On Radiant Heating And Cooling With Evaporative Cooling

The tasks for energy conservation and reduction of pollutant emissions were proposed clearly in "The Outline of The 11th Five-Year Plan" because it has a long way to go,which are becoming the focal issue attracted attention by the central government and all sectors of society.Evaporative cooling technology is adapt to this background which has been applied widely in northwestern China.At the same time, energy efficiency and thermal comfort of radiant heating and cooling air conditioning system is also attracting people's attention increasingly,and radiant heating has achieved large-scale promotion in a large area in northwestern China.At the same time,radiant cooling has also made rapid development in recent years.At present,in order to exert all powers of energy saving and pollution reduction coming from evaporative cooling and radiant heating and cooling,the condensation bottlenecks,no fresh air,low-capacity cooling of radiant cooling and the form of air conditioning system must be given full consideration in the design.Directing against the above problems mentioned,the combining air-conditioning system based on radiant heating and cooling with evaporative cooling is presented and the theoretical basis,system components,engineering design,experimental design and experimental verification of the new system are given an in-depth studyFirstly,evaporative cooling and radiant heating and cooling systems are systematically introduced,and the composite theory of the combining air-conditioning system based on radiant heating and cooling with evaporative cooling is presented. And semi-centralized air-conditioning system which is composed of two kinds of air-conditioning technique mentioned above.And then the components, characteristics,applications,operation mode of the new air conditioning system are given an intensive study.After this,this new air conditioning system is considered as the typical applications of independent theory of temperature and humidity control.Secondly,the calculation steps and calculation content of the new combined air-conditioning system are presented,that is to say,the engineering design of air conditioning system based on radiant heating and cooling with evaporative cooling is put forward systematically for the first time,giving some reference to engineering design.Thirdly,the systematical design to test bed of semi-centralized air-conditioning system based on radiant cooling and heating with evaporative cooling is carried out, and the operation mode of the test-bed in different seasons and the features of the experimental station are conducted in a detailed description,which provides a good platform for experiments to verify the engineering design method,and points out the features of the experimental station.With a view to more engineers learning about the characteristics of new air-conditioning system,meanwhile it provides a useful platform for engineering design in middle humidity area.Finally,two types of air conditioning system were put in detailed engineering test under summer air conditioning,one is the air-conditioning system based on floor radiant cooling with evaporative cooling,the other is the air-conditioning system based on capillary tube radiant cooling with evaporative cooling.These tests results indicate that temperature patterns and RH patterns have good air distribution and experimental data is meet to engineering design,there has no dew condensation on the radiant cooling surface.Thus,we can conclude that the engineering design of air conditioning system is able to guide the actual work correctly at load distribution,parameters selected between fresh air requirement of evaporation cooling and high-pressure cool water, and equipment selected,and so on.All the work done above provides the foundation for the combined air-conditioning system's further research and the promoted application,will provide the reference to the engineering design,and the method for new semi-centralized air-conditioning system based on evaporative cooling studied in the next year.This research will impel the evaporative cooling air-conditioning system to become into diversification,and will accelerate the air conditioning of evaporative cooling and radiant heating and cooling in the home field of application and development.