1 The source of the design
This task is to complete the design of air conditioning system of the Shanghai office building design, aims to through the air conditioning system design, basic grasp the general plan selection, equipment selection, hydraulic calculation and load calculation, etc., cultivate the ability to analyze and solve problems for the future is engaged in HVAC design, construction management and so on various aspects lay the solid foundation, at the same time can understand this professional in the actual process and relevant professional contact and role.
Through this graduation design, make we able to work independently, independent thinking, independent acquire new knowledge and use has learned knowledge is the ability of solving practical problems, for after graduation in this major or related professional and lay the good foundation.
2 The general situation of the engineering
The building is located in Shanghai, this building is for central air conditioning system design, it is a three floors of the building, with a total construction area of 4749.63 square meters and a building total height of 825 meters. A layer of main is tall and businesses, and the hall was 4.5 meters; 2 and 3 layers, each layer for office are 3.75 meters high.
3 The basic of Design
3.1 Design task request and the original information
According to the Building nature, purpose and requirements of the construction unit of Sunshine hotel for specific types of hotel design are as follows：
⑴ load calculation (mainly carried out gradually when the cooling load).
⑵ air-conditioning system design wind: based on the actual situation of choice for the construction of the system.
⑶ cold and heat source equipment design.
⑷ the calculation of air-conditioning Selection: including the choice of fan coil, air conditioning units and air units of the new calculation Selection.
⑸ air conditioning water systems and wind systems design and calculation: including water piping system design, fan coil units and air-conditioning layout.
4 The load calculate of air condition
In the air conditioning engineering design, there are two inter-cooled load, the calculation method for harmonic response: a method (temperature method), a load for cold load coefficient method. Cold load coefficient method is based on the transfer function for easy in engineering in the hand count and set up a kind of simplified calculation method. Through the cold load temperature and cooling load coefficient perturbation obtained directly from the breakdown of energy hourly cold load this design is the use of cold load coefficient method for the cold load calculation.
5 Air condition breeze systems
The entire building adopts primary air fan coil air conditioning system. Have independent fresh air system supply fresh air, namely indoor managed to interior parameters, do not assume room load. This scheme both improve the system adjustment and operation flexibility, and into the fan coil water supply temperature can be appropriately increased, conduit condensation phenomenon can be improved.
6 Air conditioning water system
Taking into account the design of the pipeline system is simple, the design of water systems are dual-tube. That is for, return water pipe in the opposite direction of flow, the pipe length of each ring circuit range, using the method without a return pipe, pipe length is shorter, simpler pipeline.
This design USES is cold water chiller, air-cooled heat pump, unit of scheme. Decorate roof Water supply, the stand pipe adopts different programs, fresh air fan-coil unit and system Shared supply and backwater stand pipe; Each layer of conduit with programs, by constant pressure water system USES expansion water tank, expansion water tank on the top floor.
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