Simulation of Heat Transfer Characteristics of Ceiling Radiant Heating System in Passive House in Severe Cold Region
The heat transfer characteristics of the ceiling radiant heating system in the passive house are simulated and studied.The degree of influence of various influencing factors(pipe center distance,dis-tance between ceiling bottom surface and buried pipe center,outer diameter of buried pipe,water supply tem-perature and hot water flow rate)on the heat flux den-sity of the ceiling bottom surface was evaluated.When the water supply temperature increases by 1 ℃,the av-erage temperature of the ceiling bottom surface increa-ses by about 0.6℃,and the heat flux density of the ceiling bottom surface increases by about 2 W/m2.When the water supply temperature is 30 ℃,the hot water flow rate increases from 0.25 m/s to 0.50 m/s,the average temperature of the ceiling bottom surface increases by 1.2 ℃,and the heat flux density of the ceiling bottom surface increases by 3.9 W/m2.When the water supply temperature is 30 ℃,the outer diame-ter of the buried pipe increases from 16 mm to 25 mm,the average temperature of the ceiling bottom surface increases by 2.4 ℃,and the heat flux density of the ceiling bottom surface increases by 8 W/m2.The dis-tance between the ceiling bottom surface and the buried pipe center has little influence on the heat transfer characteristics of the ceiling radiant heating system,and 50 mm can meet the requirements in the project.When the indoor temperature is 20 ℃,it is recommended to take the buried pipe outer diameter of 20 mm,the water supply temperature of 30 ℃,and the hot water flow rate of 0.3 m/s.The factors affecting the heat flux density of the ceiling bottom surface are ranked from strong to weak as follows:water supply temperature,outer diam-eter of buried pipe,hot water flow rate,pipe center dis-tance and distance between ceiling bottom surface and buried pipe center.
passive houseceiling radiant heat-ing systemheat transfer characteristicsinfluencing fac-tors
万方数据
维普
