The Gray Model Of Indoor Human Thermal Comfort With The Radiant Ceiling Conditioning System

To promote energy efficiency in radiant ceiling system under the premise of thehuman thermal comfort, it was essential to establish a reasonable model for humanthermal comfort. Considering uncertainties in the human thermal comfort,this paperused gray theory and research uncertainties in the assessment of human thermalcomfort, and then through the generation and development of the known information,achieving the purpose of establishing thermal comfort models under the radiantceiling conditions.First, this paper analyzes the characteristics among various factors and personnelsubjective evaluation using gray relational theory. The gray correlation degreeanalysis between factors and human thermal comfort percent satisfaction showed that:the attention should be focused on the factors ceiling temperature, mean radianttemperature, air temperature and relative humidity when designing and controllingradiant ceiling system. Second, in order to simplify the complex system, the grayrelational clustering analysis was used to merge the same factors through calculatingabsolute gray correlation among each factors,which could reflects the correlation inresource and the results showed that: when the threshold was0.85, the ceilingtemperature, indoor dry bulb temperature, mean radiant temperature, verticaltemperature, radiation in homogeneity can be merged into one category under theradiant ceiling conditions. Finally, this paper simply analyzed how to handle theexisting models and discussed its disadvantages. Then the gray expand human thermalcomfort discrete multivariate model FDGM (1,6) was established on the basis of graymodeling, and the model accuracy was calculated to justify it.