Simulation analysis of heating energy consumption of typical buildings

Adopting the three typical farmhouse models in Section 4.1, selecting Yulin City, a representative city of Cold A Zone, and Xi'an City, a representative city of Cold B Zone, and based on the starting and ending dates of outdoor air calculation parameter daily average temperature ≤ 5 ℃ in Appendix A of GB 50736-2012, the heating periods of the two places were set to be from October 27th to March 28th of the following year, and from November 23rd to March 2 of the following year. For the six envelope practices described in Section 4.2, only the first three are calculated because the envelope in the living space does not bear the load under the whole-room continuous heating energy consumption algorithm, while all of them are calculated under the split-room intermittent heating energy consumption algorithm. In addition, when calculating the energy consumption of continuous whole-room heating, all living spaces are heated 24 hours a day, and the calculated indoor temperature is 18 ℃. For the calculation of energy consumption for intermittent heating in separate rooms, a distinction is made between permanent and non-permanent rooms, and the calculated indoor temperature and daily operation time of the heating system are set according to the requirements of sections 3.1 and 3.2, respectively.

According to the compilation and explanation of GB/T 50824, the energy saving rate of farmhouses in cold regions implementing GB/T 50824 envelope energy-saving practices can reach about 50% compared to ordinary farmhouses without energy-saving at that time. The current status quo farmhouse generally still does not take any thermal insulation measures, consistent with the farmhouse envelope practice at the time of GB/T 50824 research. According to clause 3.0.8 of the revised GB/T 50824, its energy consumption level has been reduced by more than 30% on the basis of GB/T 50824. Under the energy consumption algorithm for continuous heating of the whole room, the average energy saving rate of farmhouses implementing GB/T 50824 compared with the status quo farmhouses is 55.63% in the cold A zone, 56.30% in the cold B zone and 56.00% on average; the average energy saving rate of farmhouses implementing the revised draft of GB/T 50824 compared with the farmhouses implementing GB/T 50824 is 37.68% in the cold A zone, 38.48% in the cold B zone, and 38.48% on average. 38.48%, with an average of 38.08%, and the results of each calculation can satisfy the energy saving rate requirements of GB/T 50824 and the revised draft of GB/T 50824. Under the energy consumption algorithm of intermittent heating in separate rooms, the average energy saving rate of farmhouses implementing GB/T 50824 compared with that of the current farmhouses is 62.46% in cold A zone, 63.69% in cold B zone, and 63.08% on average; the average energy saving rate of farmhouses implementing the revision of GB/T 50824 compared with that of GB/T 50824 farmhouses is 25.51% in cold A zone, 23.22% in cold B zone, and 24.22% on average; all the calculation results can meet the requirements of GB/T 50824 and GB/T 50824 revision. 23.22%, an average of 24.37%; in the GB/T 50824 revised draft based on the consideration of the heating room envelope insulation, the average energy-saving rate compared to the GB/T 50824 farmhouse is significantly higher, 40.71% in the cold A zone, 39.04% in the cold B zone, an average of 39.88%. GB/T 50824 and the revised draft GB/T 50824 both focus on the improvement of the thermal performance of the outer envelope of the farmhouse. Under the algorithm of continuous heating energy consumption in the whole room, the inner envelope of the living space does not bear the heat load, and the load of the outer envelope accounts for the main part, and the above improvement measures can effectively realize the target of energy saving rate. Under the energy consumption algorithm of intermittent heating in separate rooms, the internal enclosure structure of the living space needs to bear the heat load of heating in separate rooms and intermittent heating, and it can be seen from Fig. 7 that, with the upgrading of the implementation standards of agricultural houses, the load proportion of the internal enclosure structure and its influence on energy consumption are greater, and the thermal insulation of this part should be strengthened to reduce the heat transfer from the neighboring rooms to guarantee the realization of the goal of energy saving rate.