Research On Performance And Applicability Of Capillary Ceiling Radiant Air Conditioning System

With the rapid development of the world economy,the energy consumption is growing faster and faster.To improve the energy efficiency of buildings' air conditioning system,people began to apply more energy-efficient air conditioning systems.In this context,the capillary radiant air conditioning system gradually draw people's attention.Capillary radiant air conditioning system bears building load through radiative heat transfer with low temperature requirement for chilled water and hot water,which leads to a great energy saving potential.What's more,it uses radiant cooling and heating to deal with indoor load,which makes air-conditioning room more comfortable.In this paper,the performance and applicability of capillary radiant cooling combined with dedicated fresh air dehumidification air conditioning system was researched.Firstly,the heat transfer model of radiant air conditioning system was established by Matlab software in three steps: establishing two-dimensional model by partial differential equation toolbox,extending it to three dimensions by nodal temperature analysis,and establishing whole heat transfer model by heat balance principle.Secondly,the cooling performance of radiant air conditioning system was analyzed,using three-dimensional heat transfer model for radiant ceiling and whole heat transfer model for the whole air conditioning system,respectively.For radiant ceiling,the influence of ceiling configuration parameters and supply water parameters on the cooling capacity is analyzed,and the influence degree of different factors is studied by sensitivity analysis.For the whole system,the influence of water supply parameters,fresh air parameters and outdoor climate conditions on the cooling capacity is analyzed.It was concluded that the variation of water supply parameters has a greater influence on the system cooling than the fresh air parameters,and the radiant ceiling has better self-regulation ability than dedicated fresh air.Thirdly,the energy consumption analysis model of air conditioning system combined with cold source was established.The simulation results show that the total energy consumption array of three kinds of cold source setting modes is as follows: respective water supply with different cold sources less than parallel water supply with same cold source less than series water supply with same cold source.Finally,four typical climate cities in China were selected to discuss the applicability of the capillary radiant cooling air conditioning system in different climatic regions.Based on the simulation of the cooling season in these four regions,the suitable configuration parameters of radiant air conditioning system in a standard office building under four typical climatic conditions are obtained.The simulation results show that the dedicated fresh air system of office buildings occupies a large part of the energy consumption,which leads to further discussion on the feasibility and implementation measures of other energy-saving cooling and dehumidifying methods for fresh air.Based on above research,the performance and applicability of capillary radiant air conditioning system are detailly studied in this paper,and many meaningful conclusions are obtained,which can provide reference for the research and engineering application in related fields.