This paper gives out principal keys on design optimizing , energy consumption reduction , resources saving and elementary investment reduction for hvac systems of typical modern hotels 针对这些情况，有必要对工程设计进行分析研究，针对工程设计中存在的问题进行改进，达到优化设计、降低耗能、节约资源、减少初投资等目的。
Abstract : connecting with example this paper introduces the rational application of bypass pressure fixing and secondary pumping system in air conditioning ' s cooling water system of tall buildings 文摘:本文结合实例介绍了旁通定压和二级泵系统在高层建筑空调冷水系统中的合理应用。该技术节约了设备初投资和运行费用，使系统的运行曲线和设计水压线相吻合。
As a example of a residential district , analysis of the economical efficiency of different modes of district cooling systems is carried on in initial investment and operation cost in order to supply reference to the correct choosing of cold source of distrct cooling system 以某住宅小区为例，对居住区实行区域供冷不同系统的经济性从初投资和运行费用两个方面进行了分析，为正确的进行区域供冷的冷源选择提供参考。
The results indicate that thermostatic radiator valves can regulate and control indoor temperature effectively and save heating energy consumption , and that using thermostatic radiator valves can produce good economic benefit because the initial investment is lower and the payout period is shorter 分析结果表明散热器恒温控制阀可以有效调控室内温度和节约供暖能耗；恒温控制阀初投资低和投资回收期短，在实际应用中可以产生良好的经济效益。
The desired type of heat exchanger is determined by considering economic factors such as the total costs , comprised of the capital and operating costs . the cost - effectiveness of investments of each system is discussed , with parameters , such as the payback period , net present value and internal rate of return 分别计算了上述三种系统的cop 、逐月制冷制热量，并分析了初投资、运行和维护费用、投资回收期、净价值以及偿还利率等经济学参数对不同系统的影响。
This paper separately analyzed the principle and characteristic of water condensing + water condensing mode and air condensing + water condensing mode of compound condensing method . it is found that the building heating and cooling systems applied compound condensing method can well integrate the function of space cooling and space heating and sanitary hot water heating . the compound condensing method could well preserve energy , and its integration makes the investment of building heating and cooling system more economical 论文对复合冷凝技术的水冷+水冷模式和风冷+水冷模式的原理分别进行了探讨,讨论发现此技术能使冷热源机组将空调制冷、空调供暖、生产卫生热水等功能互相结合起来,节能效果显著,集成化的功能也使得建筑冷热源设备的初投资也大大减少,并很大程度上缓解了建筑冷热源设备对环境的热污染和城市的“热岛效应” 。
Ground source heat pump ( gshp ) is becoming the more and more focus of the word ' s attention as a hvac technique of energy saving and environment protection . this paper summarized the research and development of gshp oversea and in our country , provided several typical heat transfer modelings and introduced neural network ( nn ) methology and its current application situation in hvac field 由于受初投资大、本地地理气候影响大等限制，我国地源热泵尚处初级开发阶段。本文综述了地源热泵（ gshp ）在国外和国内的研究发展状况，介绍了几种典型的地下埋管换热器传热模型，并概要介绍了神经网络及其在暖通空调领域的应用现状。
Through comparison of start - up mode and start - up time for high - pressure and medium - pressure cylinders , service life expenditure , bypass system allocation , capital investment , and operation cost etc . , combining with the type and capacity allocation of bypass system for units , which have already been put into operation in our country , some recommended opinions for salecting the bypass system of units have been put forward 通过高、中压缸起动方式的起动时间、寿命损耗、旁路系统配置、初投资、运行费用等的对比，结合国内已投运机组的旁路系统型式及容量配置，提出了选择机组旁路系统的推荐意见。
So it save much energy consumption of the air conditioning running . but the preliminary investment of the psd system is higher . in the feasibility researching phase of the subway environmental control item , it is essential to do the technoeconomics analysis and forecast of the psd system 站台屏蔽门系统在我国还是一种新型的地铁环境控制系统，它将地铁车站站台与列车运行空间隔开，避免了冷量损失，节省了大量空调运行能耗，但站台屏蔽门系统初投资较高，因此在地铁环控项目的可行性研究阶段，进行站台屏蔽门系统的技术经济分析与预测非常必要。
