6 空调水系统
在空调设计当中，水系统通常包括：冷冻水系统和冷却水系统，集中的空调房对分散的空调用户供应冷热量时，常以水作为传递冷热量的介质。冷冻水循环流程：水泵—冷水机组—末端设备—水泵。根据回水方式的不同，空调水系统有重力式和机械式两种，本设计采用机械式，为封闭式系统。空调水不与大气相接触，仅在系统的最高处设膨胀水箱，管路系统不易产生污垢和腐蚀，无须克服系统进水压头（膨胀水箱定压），水泵能耗相对较少。由于本设计采用全空气系统，故不考虑水系统的设计。

The general illustrate of design
1 The source of the design
Due to the HVAC's main features include: Heating, ventilation and Air Conditioning, the three aspects of abbreviations for HVAC (Heating, Ventilating and Air Conditioning), take the three functions of comprehensive, is the HVAC.
Hvac design is mainly to design of indoor thermal environment and air quality, but it must be in fully understand the construction of hvac requirements and hvac systems and equipment for buildings and other facilities on the basis of the influence of the design.
The design task is to complete the Shanghai hao sheng building air conditioning system design. Through four years learning of theoretical and practical knowledge of air conditioning system design, the purpose is to ask students to understand and grasp the related information search, hvac design specification and learn the basic knowledge of hvac design, the design methods and steps, to cultivate students ability to solve practical problems, is engaged in refrigeration, hvac aspect for the future work to lay a solid foundation; Therefore asked the students in the whole design process strictly enforce college requirement for graduation design, the independent completed the graduation design under the guidance of teachers.
2 project summary
The building is located in Shanghai, is used in air conditioning system. Construction area of 16979.7 ㎡. Building for total 11 layer, the height of 4.5 meters. Each layer is mainly for office room, rest room, gymnasium, business center, bank, hall, restaurant, etc. With the latest technology at home and abroad, design the most comfortable, the most energy-efficient buildings.
3 design basis
3.1 the design plan descriptions of the requirements and offer the raw data
In accordance with the requirements of building nature, use and construction units, the Shanghai hao sheng building planning are as follows:
1, load calculation, you can use the hand can also make use of relevant software
2, hydraulic calculation
3, equipment type selection
4, drawing drawing
3.2 the main reference
1, the cooling technology in air conditioning engineering of Harbin engineering university press, Liu Yajun, 2001
2, use the air conditioning refrigeration technology, mechanical industry publishing house, Li Shulin, 1995
3, the HVAC air conditioning design guide China building industry press, Liu Yaoqing, 1996
4, to the publication of the Clean room design: Chichester, Whyte, W.S., (Walter s.), Wiley, c1991
4 The main work of designs
Combined with the architecture characteristics choose air conditioning mode; Calculation of cold and hot load; Duct layout and hydraulic calculation; Of each pipeline hydraulic calculation table were listed. According to the hydraulic calculation to choose air-conditioning equipment, including air conditioning unit, outlet diffuser and etc equipment.
5 air conditioning wind system
Added fresh air requirements: meet the sanitary requirements, local exhaust air volume, keep the positive pressure of air conditioning room. Duct hydraulic calculation purpose: make sure each section of pipe diameter and resistance, provide the basis for equipment type selection, system meet the requirements of ventilation rate. In order to ensure the reasonable air distribution, to cope with system pressure balance, the unbalanced rate control within 15%. Usually adopts the calculating methods are: assume that the velocity method, the loss of pressure average method of static pressure well. This design adopts the assumption that the velocity method. Loss mainly includes frictional loss and local resistance loss. 大厦空调系统设计+CAD图纸+回风管水力计算(2):http://www.751com.cn/gongcheng/lunwen_6891.html