A Study Of Calculation Method For Dynamic Heating Load Of Solar Heating Room

At present, steady calculation method still be adopted for calculating heating load of solar heating room in two design standards about solar heating, which named solar heating engineering specification (GB50495-2009) and Tibet autonomous region design standard for energy efficiency of residential buildings (DB54/0016-2007). This steady calculation method is simple accurate, but it can't reflect the strong fluctuation of heating load of solar heating building. On the other hand, heat output of solar heat source has a obvious fluctuation, and it conflicts the phase of heating load. So solar heating system need depend on heat accumulate regulation to ensure heating effect. However, grasping the dynamic rules of heating load of solar heating room provides a basis for accumulating and regulating heat. In view of this, this paper draws lessons from air conditioning cooling load coefficient method, and puts forward a heating load dynamic calculation method for solar heating room, which is easy to engineering design application. This method is called heating load coefficient method.In the establishment of mathematical models, this paper analyzes wall (or roof) dynamic heating transfer process and room dynamic heating load formation process, and gives the mathematical models of wall (roof) heat loss and room heating load. In this paper, wall (or roof) or heating room together with indoor air are regarded as thermal system, and external crack disturbance and indoor heat loss are considered as this system input, while heat loss through wall (or roof) and room heating load are considered as system output. System input and system output are both expressed by time series, and conversion relationship between them is expressed by Z transfer function. 1In simulation calculation, according to the hourly result of wall heat transmission, which is obtained by programming calculation, this paper gets the heating load coefficient of solar energy heating room. By the calculation of different orientation wall and different wall structure,finds:the lager the wall heating capacity,the smaller the daily changing amplitude of heating load coefficient; the same structure, but with different orientation wall, the heating load coefficient has obvious difference.Based on this study, this paper has developed software used for calculating dynamic heating load of solar heating room. Under different sites, different wall (or roof) structure, different orientation wall combination situation, dynamic heating load and heating load coefficient of solar heating room in typical day can be calculated by this software.This study provides reliable basis for the design and operation regulation of solar heating system.