| In recent years,in view of the increasing seriousness from the energy and environmental problems and meeting the people's health and comfort requirements,how to rationally arrange the energy utilization,environmental protection,energy conservation and emission reduction,and reducing energy consumption has become the hot issue for people to urgently solve in the 21 st Century.Traditional airconditioning modes and their running systems have many problems,such as high energy consumption,environmental pollution,poor indoor air quality,and poor thermal comfort,etc.which impel the related scholars,engineers and technicians to continuously develop some new kinds of air-conditioning modes to solve these existing problems.Based on the above problems,an air-conditioning system of combining capillary ceiling radiation with displacement ventilation(ACSCCCRDV)is proposed in this paper,which adopts the designing concept of independent temperature and humidity control and possesses the features of energy saving,environmental protection,comfort,etc.On the basis of verifying the feasibility of this system,the variation regularity of the important parameters that can characterize indoor thermal environment is obtained by the relevant numerical simulation when the proposed ACSCCCRDV is applied to an office in Changsha area.By analyzing,the results meet the evaluation criteria of indoor thermal comfort and show that this ACSCCCRDV is theoretically feasible as well,which can be used for a certain reference in engineering practice.The main contents of this paper are as follows:1.Based on the analysis of the mechanism,the working principle and important components of the capillary radiation air-conditioning system are stated and the running modes of summer and winter air-conditioning of the ACSCCCRDV are described,the corresponding measures to solve the condensation problem and the evaluation standard of indoor thermal comfort are introduced.2.Based on an experimental object in the existing literature,with the aid of numerical simulation method,the changing curves of the relevant important parameters of this ACSCCCRDV are obtained.Compared those data from the numerical simulation with the relevant experimental data in the existing literature,the maximally relative error is less than 3%.It shows that the numerical calculation model and the research method of the proposed ACSCCCRDV are correct and feasible.3.The office in Changsha area is selected as the application object of this ACSCCCRDV,and the relevant design,layout of this system,calculation and type selection of main equipments are also executed.By Airpak software,the variation regularity of the important parameters characterizing the indoor thermal environment of this office is obtained via the numerical simulation.By analyzing,the corresponding results meet the evaluation criteria of indoor thermal comfort.4.The effects on indoor thermal environment of underfloor air distribution,horizontal wall jet,and vertical wall jet are executed by numerical simulation under the working conditions of summer and winter air-conditioning while keeping the same capillary ceiling radiation cooling and heating capacity.It can be found that this ACSCCCRDV can create a more comfortable indoor thermal environment for people by comparing and analyzing the related numerical results.5.An all-air air-conditioning system,a primary air plus dry fan-coil air-conditioning system,and an indoor radiator heating system are applied to the same office under the working conditions of summer and winter,respectively,and the corresponding variation regularities of important parameters characterizing the indoor thermal environment of this office are obtained.With the comparison and analysis of energy utilization coefficient,IAQ and comfortable parameters,the proposed ACSCCCRDV is more suitable for the working conditions of both summer and winter under the same indoor cooling and heating loads. |
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