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单设新风系统，独立供给室内，可随着室外气象变化进行调节，即把新风处理到室内参数，不承担房间负荷，保证室内湿度与新风量要求。这种方案既提高了该系统的调节和运转的灵活性，且进入风机盘管的供水温度可适当提高，水管结露的现象可以得到改善。
6 空调水系统
由于该建筑的空调水系统，考虑到设计的管路系统简单，该设计的水系统均采用两管式。客房部分竖向为异程式，即供、回水干管中的水流方向相反，每一环路的管路长度不等，采用该方式不需回程管，管道长度较短，管路简单；纵向为同程式，即供、回水干管中的水流方向相同，经过每一环路的管路长度相等，采用该方式使水量分配、调节方便，便于水力平衡；
季节转换采取在分、集水器上阀门切换。空调机组和风机盘管回水管上设电动两通阀，根据空调负荷变化调节通过盘管的水量，分、集水器间设电动压差旁通阀来文持系统压力平衡。
7 卫生间通风设计
本工程房间的卫生间设机械排风装置，设置排气扇，卫生间的通风换气量按20-30m3/h。无窗卫生间设置排风口，排风由风管同一接出，由排风机排至室外。靠近外墙且有外窗的卫生间，直接排到室外。卫生间保持负压，防止气外泄，卫生间选用排气扇加止回阀.
The general illustrate of design
1 The source of the design
HVAC design is mainly for indoor thermal environment, air quality in design, but construction must be fully aware of the requirements for HVAC and HVAC systems and equipment for construction and other facilities on the basis of design.
The design task is to complete the Shanghai Yibo building conditioning design, design issues since the actual project. Purpose of this project through the design, control air-conditioning systems design, design steps to train students of the problem, solve the problem of the actual application capacity; deepen their understanding of building air-conditioning engineering expertise and understanding of memory; have air-conditioning duct, plumbing , Equipment selection and layout; master of wind and water mains in calculation; enhanced graphics capabilities and develop analytical, problem-solving practical engineering capabilities for the future in the indoor environment and public works construction equipment of HVAC design and construction organizations , Operation and management work for a reliable basis.
2 The general situation of the engineering
The building is located in Shanghai, is a 10-story budget building, the building area of 7800 square meters. Including underground and ground ten layers. Mainly for warehouse and equipment room, the underground layer one to three layers of dining-room, balcony, such as occupancy, four to nine layers for hotel rooms, building height is 36.6 meters. The air conditioning design mainly for air conditioning room above the ground for the design of air conditioning system.The air-conditioning design is mainly directed against above the ground.
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 the Shanghai Yibo building for specific types of building 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 the calculation of air-conditioning Selection: including the choice of fan coil, air conditioning units and air units of the new calculation Selection
⑷ air conditioning water systems and wind systems design and calculation: including water piping system design, fan coil units and air-conditioning layout
4 The main design work
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