Research On Radiant Heating Building Model Of Solar Phase Change Floor

Solar energy as a kind of clean and renewable energy quality get more and more application in today's world,its combination with the construction is also in the process of gradual promotion.Floor radiant heating;due to its low for the return water temperature and can provide a better thermal comfort,also become a trend of future heating.To solve the problem appeared in the course of a combination of solar energy by the time limit,Use phase change materials to storage heating under low load of abundant solar energy during the day,to meet the demand of heating energy under high load.This paper analyzed the heat conduction process of the phase change material,wrote a model which used to calculate the temperature changes of phase change in the conductivity process,after the module into the building system,analysis the effect of phase change materials on the indoor thermal environment changes.Apply specific heat capacity method deal with the material heat capacity change in phase change process of phase change.Based on TRNSYS framework,write a phase change material module which can calculate each node temperature of phase change material.Reference to relative absolute value and consistency of trend analysis of two kinds of mathematical method to evaluate the accuracy of the simulation results with the experimental results of the judgment and consistency,Results show that the relative error is 4.82%,the consistency of boundary for(0.7436,0.7436),outside boundary points to 4.9%.Simulated temperature changes of the reference heating room.Compared to two kind of room temperature change rate,indoor temperature peak value and peak valley value difference and so on time differences,analysis of the effect of phase change materials on the indoor temperature.Define the concept of auxiliary energy ratio;with the direct heating room heating energy consumption is relatively reduced by 5.87%.Optimize the solar phase change,analysis the change of phase change materials melting solidification radius,melting solidification temperature effect on the system.Simulation analyzed phase change materials dosage,water system control and the influence of solar collector,Simulation results show that the radius change melting solidification radius than big impact on the system,and when the solidification temperature is between 26 ?~27 ?,can produce higher indoor temperature.And by making a reasonable control strategy the indoor temperature have a small rise.In the cold area,select Beijing,Lhasa and Yinchuan do solar floor heating system suitability analysis,analyzed the influence of solidification temperature and the radius of the solidification temperature on the system;the result show that the average temperature of indoor air is higher when Beijing's is 20? and Yinchuan's and Lhasa's are 24?;the indoor average temperature of the three region is higher when the radius of solidification temperature is 3?.