地板辐射供暖房间内表面温度和节能率的影响因素分析

Analysis on influencing factors of inner surface temperature and energy-saving rate of radiant floor heating room

基于热平衡原理,建立地板辐射供暖房间传热数学模型,并根据试算法原理对模型进行求解。结果表明:冷风渗透量和室外温度对辐射板表面温度影响较大,外围护保温性能对外围护内表面温度影响较大;无冷风渗透时,内围护表面温度几乎等于室内温度,冷风渗透量为0.5次/时,内围护表面温度比室内温度高1℃以上;在相同室内温度下,南向房间所需的地板温度比北向房间的低,而南向房间的外围护内表面温度比北向房间的高,南、北向房间内围护表面温度几乎相等;南、北向房间辐射供暖相对于散热器供暖的节能率均随着房间冷风渗透量的增大、室外温度的降低和室内温度的升高而减小,且北向房间的节能率大于南向房间;在相同室内温度和冷风渗透量的条件下,从严寒地区到寒冷地区再到夏热冬冷地区,辐射供暖相对于散热器供暖的节能率逐渐增大。

Based on the principle of thermal balance,the heat transfer mathematical model of radiant floor heating room is established.The model is solved based on trial algorithm.The results show that cold air infiltration and outdoor temperature have a great effect on radiant floor surface temperature.Thermal performance of building envelop has a great effect on its inner surface temperature.Inner envelope surface temperature is almost equal to indoor temperature when there is no cold air infiltration,and it is more than 1℃higher than indoor temperature when cold air infiltration is 0.5 times per hour.Under the same indoor temperature,the floor surface temperature required by south-facing room is lower than that of north-facing room,while the external envelop inner surface temperature of south-facing room is higher than that of north-facing room,and the inner envelop surface temperatures of the north-facing room and south-facing room are almost equal.The energy-saving rate of radiant heating room compared with that of radiator heating room of the north-facing room or south-facing room decreases with the increase of cold air infiltration,the decrease of outdoor temperature and the increase of indoor temperature,and the energy-saving rate of north-facing room is higher than that of south-facing room.Under the same indoor temperature and cold air infiltration,the energy-saving rate of radiant heating room compared with that of radiator heating room increases gradually from severe cold zone to cold zone and to hot summer&cold winter zone.