Aimed at the new J-shape ventilation system of fully mechanized sub-level caving face,the model of computational fluid dynamics was set up for simulating the flow field of the goaf under J-shape ventilation system.

5201 fully mechanized sub-level caving face in Wangzhuang Coal Mine of Lu'an Mining Group, and based on the successfully retaining of small section entry along gob side, the method of J-shape ventilation system and its regulating technology were put forward for controlling high gas emission at fully mechanized sub-level caving face.

The J-typed ventilation,based on the U-typed ventilationi,s specially designed with one inflow and two outflows for draining gas better.

Compared the programming method of theobject-oriented and process-oriented, the basic concepts and principal properties of the object-oriented method was introduced, the software programming method of the fan selection system was analysed and an example of class is listed.

Compared the programming method of the object-oriented and process-oriented,on the introduction of the basic concepts and principal properties of the object-oriented method are emphasized,and based on these concepts,the software programming method of the fan selection system is analyzed.

With the development of society, people's concern over indoor thermal environment and indoor air quality (IAQ) has led to the emergence of mini-type ventilation system, which brings healthy and comfortable environment to freestanding residential buildings and small offices.