Research On Influence Of Internal Thermal Mass And Controllable Inner Heat Sources On Thermal Inertia Of Building

Most of the current heating load calculation methods do not think about the thermal inertia of the architecture enough, resulting in high designed heating load. At the same time, the determination of most heating and air conditioning system operating strateges, such as keeping the same heat supply throughout the day, is not combined with the regenerative effect of the architecture, ignoring the characteristic that the outdoor environment itself is a periodic external disturbance with a 24-hour cycle. As a result, the indoor temperature is turning higher with the outdoor temperature, wasting the heat supply. And as the indoor temperature fluctuates with the outdoor temperature, the indoor thermal stability is poor, causing it difficult to meet people's requirements for the the thermal comfort. So, it is of great significance to analysis the influencing factors of the architecture thermal inertia and study how to combine the role of the thermal inertia with the optimization process of the system operating strateges for reducing the system energy consumption and improving the indoor thermal comfort.On the base of summarizing the common thermal inertia characteristic parameters from the existing theories, experiments and simulations, this paper selected two groups of parameters respectively from the responses of the thermal inertia to the periodic external disturbance and to the operating role of the controllable inner heat sources. By the way of Energyplus software simulation and practical measure research, it had analyzed the impact of both interior building envelope and indoor furnitures on the architecture thermal inertia with the selected characteristic parameters. And based on the study of the two responses talking above, it had researched a step operating strategy with a 24-hour cycle.From the research conclusions we can see that the internal thermal mass, as a heat store unit of the architecture thermal inertia, weekens the role of the solar radiation. Within the internal thermal mass, the interior building envelope make much more contributions to the whole storaged heat than the indoor furnitures do. From the result of single variable curve-fitting on the amount of the internal thermal mass and the selected characteristic parameters, it shows: Relative to the parameters on the periodic external disturbance, the change rule is in conformity with the polynomial-series fit; Relative to the parameters on the step operating role of controllable inner heat sources, the change rule is in conformity with the Fourier series fit. Based on the findings above, it finally proposed a method about how to combine the role of the thermal inertia with the optimization process of the system operating strateges, using the thermal inertia characteristic parameters in the evaluation of system operating strategies, and analyzed the importance of conbining the architecture thermal inertia with system operating strategies.