Calorific value approximate calculation method for subway equipment room

The invention discloses a calorific value approximate calculation method for a subway equipment room. The method comprises the following steps: (1) measuring and obtaining the boundary dimension and the number of heat dissipation planes of cabinets in the subway equipment machine room, the average temperature and the average humidity of air in a room and the convection air speed in the room; determining whether a cooling fan exists, and if yes, obtaining the air speed of the cooling fan; (2) obtaining the average temperature of the surface of the cabinet, wherein the average temperature comprises the average temperature of a cooling fan area on the surface of the cabinet and the average temperature of a non-cooling fan area; (3) searching air physical properties according to the average temperature of the air in the room, and further calculating a convective heat transfer coefficient and a convective heat transfer area; (4) calculating the convective heat transfer amount Q according tothe convective heat tran