? The library is a quiet place. Considering the noise requirements, the central air conditioning system is set in the main area, which is convenient for noise elimination and earthquake prevention, and frequency conversion energy-saving equipment is adopted.

? In late summer and early winter, the per capita flow in the museum is large, so the museum must meet comfortable air conditioning standards (considering temperature, humidity, air quality and ventilation) to avoid air conditioning diseases; ? A large number of people entering the library will inevitably bring in some infectious bacteria and viruses, and bacteria, viruses and particulate matter will also breed in the reading room;

? According to the functional design of the library, air conditioning supply should be divided into four areas: office area, reading area, public area and special Tibetan area, and air conditioning should be supplied as needed to minimize energy waste; ● Overview of the library:

The first floor (Chinese stacks, foreign stacks, literature stacks and readers' salon (hollow second floor)) and the second floor (new book reading room, periodical reading room and lobby).

Third floor (electronic reading room, multifunctional reading room, hall)

The fourth floor (some offices, back issue library, special collection reading room and e-book retrieval room) and the fifth floor (retrieval tool reading room, information technology room, curator room and some offices) ● Air conditioning system.

? The air conditioning system of fan coil with electrostatic air disinfection cleaner and fresh air is adopted in the office area, which is convenient for managers to control the air volume according to the actual indoor situation.

? Each reading room is a relatively large space, and all of them adopt a primary air return system. The air conditioning unit has high filtration efficiency and is installed on the main pipeline. In addition to the muffler, muffler elbows and muffler static pressure boxes are installed at necessary positions, and the equipment is also equipped with damping pads. Set up a number of electrostatic adsorption air purification disinfectors.

? Back issue warehouse and special reading room adopt constant temperature and humidity air conditioning system, equipped with water-cooled constant temperature and humidity air conditioning unit, and the fluctuation range of day and night temperature does not exceed 2℃ and 5%; Set square diffuser with low wind speed.

● Air conditioning water system

? The water system adopts double pipes: one pump changes the water quantity, and the lower supply and the next return adopt vertical distance and horizontal same pass;

? Considering the layout of cold and heat source system, the main pipe adopts double butterfly valves for return water;

? Butterfly valves are installed on the main water supply pipes from all floors to adjust the flow, and the main return pipe uses balance valves to adjust the hydraulic balance of each branch; Install butterfly valves for return pipe entering each room;

? Considering the flow deviation caused by the change of start-stop at the end of the air conditioner, check valves and ball valves are installed on the fan coil water supply pipe, and electric balance valves and ball valves are installed on the return pipe.