engleski

Analysis of the room air and wall temperature distribution using the new type of wall-mounted convector

The new standards, for calculation of energy performance of buildings, which are under public enquiry, deal with the room operative temperature instead of the indoor air temperature in calculations of building energy needs. The operative temperature, as a representative of thermal comfort, is a function of the air temperature, the mean radiant temperature and the relative air velocity. Detailed building transient heat transfer models already allow calculation of the operative temperature, whereby determination of the mean radiant temperature is based on calculation of the area weighted mean value. This means that the obtained value is independent of the location in the room. In practice, the location of person within the room has a significant influence on the comfort level. In this paper, the room air and wall temperature distribution was determined experimentally for wall-mounted convector and conventional radiator at controlled room conditions. The room air was continuously measured at several positions and heights (0, 75 m and 1, 5 m) using calibrated T- type thermocouples. The wall temperatures were obtained from thermograms captured by the IR thermal camera. Each wall was divided into several sections with approximately similar temperatures. For these sections, the view factors used in determination of the mean radiant temperature were obtained numerically. The thermal capacity of the tested heat emitters is determined according to EN 442- 2:2014. Obtained results were analysed and conclusions about the achieved thermal comfort were made accordingly.

Mean radiant temperature, operative temperature, thermal comfort, thermography, heat emitters

nije evidentirano