Vacuum partial pressure control system is composed of computer system, vacuum modulation valve and partial pressure pump, of which the valve is one of key parts of the equipment.

The problem of energy conservation for air conditioning second returns air system;

Air conditioning includes two types,namely comfort and industrial air conditioning.

According to the characteristics of air conditioning system in high speed passenger cars,the virtues and defects of different air conditioning systems are analyzed and compared and it is pointed out that the all-air inducing system is an ideal air conditioning model.

From Air-conditioning to Space-conditioning:the Architectural Design of Office Building,China Putian Shanghai Industrial Park Development CO.

or: An analysis of the heat transfer characteristics in the airlock module in manned space environmental test shows that air-conditioning in the module is important.

Circulating pumps are generally adopted in air-conditioning system to convey cold or hot medium to satisfy the designed requirements in winter or summer air-conditioning, in which power consumption is desired to be reduced as much as possible.