design sequence: terminal first, then main engine

design principle: reasonable and economical, and minimize operating costs

design scheme and scope of application:

1. Terminal part:

1. Fan coil system; Scope of application: general offices, restaurants and other places

2. Fan coil unit plus fresh air system; Scope of application: offices, hotels, restaurants and entertainment places with high requirements

3. Full air system; Scope of application: shopping malls, supermarkets, workshops and other large-scale open spaces

2. Host part:

1. Screw chiller for refrigeration and municipal or boiler heating; Scope of application: there is a dedicated computer room with sufficient power and special personnel to be on duty

2. Air-cooled unit refrigeration (heating), municipal or boiler heating; Scope of application: the air conditioning area is small, there is no computer room, and there is no special person on duty

3. Centrifugal water chillers are used for refrigeration and municipal or boiler heating; Scope of application: large air-conditioning area, special computer room, sufficient power, and need to be attended by special personnel

4. Refrigeration (heating) of lithium bromide unit, municipal or boiler heating; Scope of application: power shortage, municipal heat source, comprehensive economy, special computer room and special person on duty < P > III. Others:

1. Multi-system with one traction; Scope of application: places with small air-conditioning area, no special computer room, no special person on duty, large air-conditioning area but not used at the same time and need independent billing

2. Duct blower system; Scope of application: large studio, no dedicated computer room, no special person on duty, flexible control and low initial investment

Design procedure:

1. Terminal part:

(1) Equipment selection:

1. Calculate the actual air conditioning area;

2. Determine the cooling load index according to the place of use, calculate the total design load, determine the required equipment quantity and equipment model according to the equipment layout characteristics; Cooling load estimation index: the combined air conditioner is adopted, and the cycle times are 6-7 times, and 8-9 times are recommended < P > (2) Water system design:

1. Locate and arrange the equipment, determine the position of the riser, and determine the same program or different program according to the complexity of the system (try to use the same program when the distance between the riser and the terminal equipment exceeds 31 meters);

2. Determine the direction of the main pipeline and connect it with the equipment reasonably. When the main pipeline has branches, a valve should be set to facilitate adjustment;

3. Determine the water flow rate of each pipe section according to the equipment flow rate, and then calculate the pipe diameter according to the design water flow rate;