Analysis And Research For Some Problems Of Ceiling Radiation System In A Building

Radiant cooling can provide excellent indoor thermal environment, low operating cost; displacement ventilation with high ventilation efficiency, can provide high indoor air quality. Reasonable combination of the two, weaknesses, and has a good energy saving effect, as a new type of air conditioning, a combination of composite ceiling radiation plus displacement ventilation air conditioning system, both at home and abroad are causing more and more attention. This article is primarily based on a mathematical model of composite system, calculated using FLUENT software.First, displacement ventilation and ceiling radiation, radiant floor and wall radiant cooling recombination radiation model for numerical simulation and compare the three cases of indoor thermal environment, such as vertical temperature difference, hair sense, the PMV-PPD index and the energy utilization factor, found in the same cooling environment ceiling radiant cooling comfort index is the most ideal, radiant floor cooling energy efficient. The calculation provides a theoretical basis for the rational optimization of various system design parameters.Second, compare the separate displacement ventilation, separate the roof radiation cooling and the two combined systems, cooling and indoor thermal environmental conditions, the use of vertical temperature, ventilation efficiency, the PMV a PPD indicators drawn from the analysis, the load is small, separate system to meet the cooling requirements, in the case of large load, only a composite system in order to meet good indoor thermal comfort requirements. In addition, analysis of the composite system cooling indoor air quality and human thermal comfort parameters such as ceiling and roof temperature, air temperature and air velocity changes, changes in which the air supply parameters have a greater impact on the work area comfort.Applicability, energy consumption and economic analysis system for the cooling characteristics of the composite system, integrated derived composite systems in general civil construction, such as rooms, offices, homes and schools, etc. can be a good use, and has great energy saving potential. This research work on the application and promotion of roof radiant cooling, displacement ventilation system design of a certain significance.