Concept of HVAC Engineering:
The full name of HVAC in the subject classification is heating, gas, ventilation and air conditioning engineering, which includes three aspects: heating, ventilation and air conditioning, and is functionally an integral part of a building.

System Efficiency Improvement Measures
1. water quality treatment
Corrosion, scaling, and impurity problems caused by poor water quality bring safety risks to system operation, increase the thermal resistance of dirt, and reduce heat exchange efficiency. The system adopts a combination of physical and chemical water treatment methods, and is equipped with a water quality monitoring controller to detect water quality indicators online and transmit them to the controller.

System Efficiency Improvement Measures

1.Heat source and hot water distribution

The heating energy consumption of buildings in hot summer and cold winter regions accounts for more than 30% of the annual energy consumption of HVAC systems. Therefore, energy conservation in heating conditions should also be paid attention to. The design improves energy utilization efficiency from the heat source side and hot water transmission and distribution.

First, the process of processing and production of air ducts
There are many types of air ducts, different air duct production process is different, to the commonly used metal air ducts as an example, its processing and production process is as follows:

First, the process of processing and production of air ducts
There are many types of air ducts, different air duct production process is different, to the commonly used metal air ducts as an example, its processing and production process is as follows:

1.Cold source preparation
As mentioned above, the project builds the system based on the principle of overall system energy saving, and the end system makes reasonable use of high-temperature cold sources.

1. Process requirements
1) Before installing the air duct, check the drawing with the construction site to check whether it can be installed according to the designed elevation and position;
2) Use infrared rays to position and set out the wires to ensure the distance and straightness of the air ducts, and find out the installation position of the suspenders according to the center line of the air ducts, and install the hangers;

The basic situation of the case project and the principle of system construction:
This paper takes the energy station in the terminal area of an airport as an example to discuss the strategies and practices for improving the energy efficiency of the energy station based on the principle of overall energy conservation of the system.

1. Process requirements
1) The flange of the air duct is processed by the mold method, and the flange of the same type uses a mold to ensure the interchangeability and dimensional accuracy of the flange;

According to statistics, the energy consumption of HVAC systems in public buildings accounts for 30% to 50% of the total energy consumption. The energy consumption of the energy station accounts for about 50% of the HVAC system, and there is a large space for energy saving, which is a hot spot in the industry at present.

1. Process requirements
1) The outer diameter or outer length of the air duct shall prevail, and shall be welded;
2) The weld seam of the welded air duct should be flat, and there should be no cracks, protrusions, penetrating slag inclusions, air holes and other defects. The deformation of the plate after welding should be corrected, and the welding slag and spatter should be removed;

19.Economic heat transfer resistance: It is the heat transfer resistance when the sum of the building envelope and unit area construction cost (depreciation cost of initial investment) and use cost (heating operation cost and equipment depreciation cost apportioned by the unit area of the envelope structure) reaches the minimum value. thermal resistance