Optimum design and constructin for the upper air-returning system at the sixth mining area, No.1 well, Yaojie coal field;

The air supply and return systems of air-conditioning as one of the important channels, contacted outdoor and indoor environment and shoulder the important task to provide good air quality for personnel and equipment.

The revamping of the gasification process,distributed control system,steam system,gas flow recovery system and the oil hydraulic system in the Second Plant of the Linyi Subsidiary of the Fengxi Fertilizer Group Co.

The computing characteristics of primary return air system for supermarket;

Analyses and compares the annual energy consumption of the system and that of the system with primary return air using the method of equivalent weight full load operation time, and the results show that in some given conditions the annual energy consumption of this system can be less than that of conventional primary return air systems, especially to the buildings which have h.

With a project example,compare the primary return air system with the secondary return air system,especially in design of the AHU.

The clean operating department applies eight unattached clean air conditioning systems, and applies the secondary return air systems with the constant return air rate.

Primary return air system and secondary return air system are the two kinds of deal with the air in the mixture air system,they both have their advantages and disadvantages.