Energy and Exergy Performances of Floor, Ceiling, Wall Radiator and Stratum Ventilation Heating Systems for Residential Buildings

To provide a highly efficient heating for the residential buildings, different heating systems, including the floor and ceiling heating, wall radiator heating and stratum ventilation heating, are compared based on a typical sleeping environment in this study. Performance indices, including occupied zone predicted mean vote (OPMV), energy consumption and exergy consumption, are analyzed under different conditions. The results show that stratum ventilation heating performs better than the conventional floor, ceiling and wall radiator heating in terms of energy and exergy consumptions. Firstly, under stratum ventilation heating, the OPMV equals zero at a low supply air temperature (20.0 degrees C for stratum ventilation heating at the supply air angle of 45 degrees and 19.7 degrees C for stratum ventilation heating mode at the supply air angle of 75 degrees). Secondly, stratum ventilation heating consumes less energy than the floor, ceiling or wall radiator heating of identical OPMV increments. In addition, compared with the floor, ceiling, wall radiator heating and stratum ventilation heating at the supply air angle of 45 degrees, the energy-saving ratio of stratum ventilation heating at the supply air angle of 75 degrees reaches 29.7%, 21.2%, 22.4% and 4.2% respectively when OPMV equals zero. Lastly, for stratum ventilation heating, the supply and return water temperatures in the air handling unit are significantly lower. Therefore, a lower exergy consumption is realized under stratum ventilation heating in comparison with the conventional floor, ceiling and wall radiator heating. (c) 2020 Elsevier B.V. All rights reserved.