Thermal Comfort And Energy Conservation Study Of Radiant Floor Heating

In this paper, the author use AIRPAK software to establish mathematical model and physical model for a standard building, and according to these models to study the comfort of indoor environment. It has tested the indoor heating environment of the building which used radiant floor heating system and radiator heating system. Analysis the similarities and difference of the two systems, the conclusion: with the number of the peripheral structure increasing, the comfort of the radiant floor heating rooms has major difference. The comfort of the room which has three external walls is the worst, it has cool feeling, the percentage of dissatisfaction get to 99.9%. The comfort of the room which has one external wall is also worse because of the higher temperature, the percentage of dissatisfaction get to 99.16%.the room with two external walls: external roof affect indoor temperature is bigger than west external wall. The percentage of dissatisfaction of the indoor thermal sensation of the room with external roof get to 21.74%.The indoor temperature which makes people comfortable is 20.72℃. The relative humidity is 60.54%.The temperature of the radiator heating room is lower, because of the existence of the positive temperature gradient, the percentage of dissatisfaction is higher. At the same time, analyzing the changes of the indoor heating environment because of the different number of the peripheral structure for the radiant floor heating system. Aiming at the existent problem, the solution method is put forward.For the standard building model, at the condition of PMV=0, the indoor temperature differential is 2℃, calculated Tr and energy conservation of the radiant floor heating system and radiator heating system. The result indicates: the mean radiant temperature value of internal surface of each maintenance structure for the radiator heating room is 17.13℃.,the mean radiant temperature value of internal surface of each maintenance structure for the radiant floor heating room is 18.80℃, the temperature difference is 1.67℃. When the south wall is the external wall, others are internal maintenance structures, the heat consumption of the radiant floor heating system is less than the heat consumption of the radiator heating system, the difference is 27.47W, the energy efficient rate is 6%. With the increase of the number of the external wall, the heat consumption is increasing. In order to meet the indoor comfort, the temperature of the floor surface should be increased. From the calculate result we know the temperature of the floor increase more, but the temperature of other maintenance structure increase little. It is conclusion that: it can meet the demand of the indoor temperature and comfort request by reduce the distance of the coil pipe to increase the heat dissipating capacity of the heat dispersing surface when the indoor heating load is increased.