House heating terminal capacity determination method based on Q-t curves

The invention provides a house heating terminal capacity determination method based on Q-t curves. The method comprises the following steps: the unit area hourly heating load in the whole heating season is calculated by using unstable building simulation software according to a house target building, envelop enclosure thermal parameters, outdoor climatic parameters, an inner disturbance mold and a zero-dimension heating time length t; an unguaranteed hour number is calculated according to 5 unguaranteed days of the mean daily temperature in the heating season to determine a design day and a heating designed load Q; when preheating is not performed, a Q-t graph is directly drawn out; when preheating is performed, different preheating times and preheating temperatures are input in the unstable building simulation software again, the corresponding heating designed load Q with preheating is obtained according to the determined design day, and the Q-t curves with preheating are drawn to build a Q-t curve cluster; and a designer can respectively determine the terminal capacities with or without preheating according to the Q-t curve cluster and the user demands. The method effectively overcomes main limitation in traditional house heating terminal capacity selection, and can realize reasonable selection of compartmenting and time-sharing heating terminal capacities to prevent the problem of higher or lower equipment capacity.