Study On Radiant Floor Heating Characters Of Large Space Building And Thermal Comfort For Different Tube Spacing

Low temperature radiant floor heating in residential buildings has been very extensive, but appliaction is less in the large space buildings. The large space building have many characters, such as height, bulky, layered.Then the indoor space temperature will be unevenly distributed that affect human comfort level. According to the characters of a large space buildings, the main study focus on the average temperature from the supply and return water, tube spacing, flow rate.In this paper, a method of numerical simulation of the FLUENT software and experiment research is used. Low-temperature radiant floor heating of Large space building can achieve the requirements of comfort, as altitude increases, the smaller the inhomogeneity of the temperature. Low temperature heat source meet the thermal comfort requirements, when the tube spacing is150mm, and meet the requirements of indoor comfort for return an average temperature of33.26℃. When the tube spacing is400mm, what indoor comfort requirements are the return average temperature of42.93℃. As the velocity improves, the average temperature of the radiant panel surface is gradually increased. However the temperature is increased0.1℃between0.5m/s and0.6m/s. Generally water temperature is not easily to be greater than10℃.With the gradual strengthening of the building envelope, building thermal loads will be smaller in severe cold and cold zones, and radiant floor heating construction tube pitch is greater than300mm situation, then there are two approaches. First, it is necessary to increase the pipe pitch. Second, you can use the local design, and radiant panel which close to the external wall can assume all the thermal loads.This article focuses on simulation of the eight kinds of different heating tube spacing methods which the floor paved overall and close to the external structure of local laying. In certain circumstances of the supply and return water temperature, the tube spacing of the same tube spacing paved program is relatively large, and the temperature distribute uniformity. The comfort of different tube spacing paved program is better, but the design is more complex, and the ratio of the heat flux is difficult to grasp. Local laying program to achieve China’s comfort requirements, then the location of the radiation plate laying the farther away from external wall is more energy-saving.VB programming of a thermal comfort evaluation by the ISO7730 standard, the8laying ways which each laying way has30points and a total of240points.Meanwhile, Each point calculates the PMV and PPD values. By calculating the contrast, at1m from the external walls of local laying program is the most reasonable.In summary, the paper provides a certain amount of design parameters and the laying of the way for the large space building low-temperature radiant floor heating. Through the comparative study, which obtained with the reference value in low temperature radiant floor heating provides a certain foundation.