2. principles of design
(1). The heat source should first use the city, the region heats or the factory afterheat.The high degree of concentration heat source can the effect be high, is advantageous for the management, also is advantageous to the environmental protection, encourages for the national energy policy.
(2). Has the city fuel gas supply area, is implementing the minute seasonal or quarterly plan price, the price inexpensive area in particular, may use the fuel gas boiler, the fuel gas cold water unit carries on heating, supplies coldly.Uses straight burns the lithium bromide absorption type cold lukewarm water unit to be able to adjust the fuel gas the season load, balanced power load peak valley, improvement environment quality.
(3). When not above heat source and irony of fate, may use the coal-burning, the fuel oil boiler heats, the electrically operated compression type cold water unit supplies coldly, or the fuel oil lithium bromide absorption type cold water unit supplies, heating coldly.
3. main design materials and design content
 this project is located Shanghai, for trade and work construction.Total floor space 190000 m ², the work region air conditioning area approximately is approximately 39264 m ², the commercial region air conditioning area is approximately 33313 m ², construction 132m, underground 4, ground 30 (16 for seek asylum highly approximately level).Skirt room 1~7 and underground 1 is partially the commercial region, including market, dining and so on; Main building 1~30 are the work regions, including entrance hall, office, conference room and so on; The basement for between the garage, the equipment and other assistances uses the room. According to the construction condition chart which gives carries on the room serial number, determined various rooms the load type, the room size, the windows and doors size, the surrounding protection structure heat transfer coefficient, the room faces, in the heat transfer area, outdoor meteorological condition, the room the design variable.With excel form various rooms by when shoulders the statistics to calculate, determined the biggest load appears time as well as biggest load value.According to the energy conservation design standard request, the union computation software, uses the cold method of correlates to carry on to the entire hotel cold load by the time calculates.Obtains after the computation, this building business district always the cold load is 13924KW, office district always the cold load is 7093 KW.
By the total load and around the local meteorological condition as well as the building environmental condition which calculates chooses the cold heat source system, this project elects to use electricity the refrigeration unit refrigeration, the cold heat source plan which the fuel gas boiler heats, this plan for one kind of cold heat source plan which uses generally, also is until now the period of revolution longest one kind of plan, is in the technology, the reliability, installs debugs and moves the maintenance and so on the aspect maturest one kind of plans.The electricity refrigeration unit supplies the freezing water, the fuel gas boiler supplies the warm general hot water and the life hot water, may satisfy various aspects fully the operation requirements.The electricity refrigeration unit selects may act according to service condition size matching, by the COP value highest centrifugal type unit, satisfies the economical movement the need.The refrigeration unit in the refrigerant choice should consider is forbid the age limit.Heat source provide, may grasp the heating time freely.Its investment and the operating cost are moderate, does not have in the special request situation in the project is the general designer's standard selects the plan.
According to calculates always the cold load and always the heat load determined cold water unit and the boiler model, simultaneously selects the inflation water tank and so on the supporting facility.Finally carries on the set the arrangement and the cold heat source system comb as well as the water conservation computation, selects the appropriate freezing water pump and the cooling water pump. 大厦中央空调系统冷热源系统设计+CAD图纸(2):http://www.751com.cn/gongcheng/lunwen_11125.html