武汉嘉叶宾馆空调冷热源的选择

针对武汉嘉叶宾馆空调扩建工程，文章对螺杆式冷水机组加燃油锅炉，螺杆式冷水机组加蓄热式电热锅炉，直燃型溴化锂吸收式冷温水机组3种类型的冷热源方案进行了技术、经济性分析，作者认为，螺杆式冷水机组加燃油锅炉方案最合适。     

某厂房分布式冷热源方案可行性分析

为充分认识某厂房的分布式冷热源方案的可行性,对新方案从一次能源煤耗差、系统年运行费用、排放产物等3个方面与燃气锅炉+电动冷水机组冷热源方案进行了定量比较。结果表明:在冷热负荷需求相同的情况下,分布式冷热源方案较传统方案耗煤量少,年运行费用低,清洁环保。     

雄安某社区中心空调冷源方案比选

结合项目当地能源价格,从投资费用、运行费用、维护费用等方面对雄安地区某社区中心的蓄冷空调、水冷螺杆式冷水机组、螺杆式风冷热泵、模块式风冷热泵、双热源多联机的空调冷源方案进行了对比,并结合项目用能特点,选择了双热源多联机冷源方案。     

某住宅区冷热源型式的分析与比较

本文针对某住宅区设置集中式空调系统的要求,对风冷热泵冷热水机组、水冷螺杆式冷水机组＋燃油锅炉、由热电厂余热蒸汽驱动的蒸汽双效溴化锂吸收式冷水机组＋热交换器和燃气直燃型溴化锂吸收式冷温水机组等四种冷热源方案作了能耗和经济性比较,认为利用热电厂余热蒸汽为能耗的方案是最适合该住宅楼的空调方案。     

大型超市建筑空调配置方案的经济性分析

运用经济性分析方法对大型建筑的常用的五种中央空调的冷热源方案的投资情况和运行费用进行比较分析,论证水冷螺杆机组加燃气锅炉是经济性最好的配置方案。     

复合式地源热泵系统能源方案应用

以新建集中供冷供热高端住宅项目为例进行能源方案应用分析。采用类比法，根据项目周边的能源条件，对目前常用的冷热源形式进行对比分析，包括冷水机组、燃气锅炉、地源热泵、市政热力等，并根据项目需求进行组合分析。基于应用角度分析各系统的设备选型、初投资、运行费用、静态回收期，为建设方的前期项目定位提供设计思路。针对新建集中供冷供热高端住宅项目，冷水机组+市政热力系统的初投资费用最低，且运行成本较低，建议采用冷水机组+市政热力形式。受区域性质、一次能源费、市政开口费、设备采购价、地质条件等因素影响，不同项目供冷供热的最优能源方案不同，为能源方案分析提供设计思路。     

利用水冷机组全年空调的可行性分析

本文提出了一种可使用水冷冷水机组同时实现夏季制冷和冬季供热的中央空调系统冷热源方案。其在夏季运行时具有水冷冷水机组制冷系数高的特点而冬季又能象风冷热泵机组一样以热泵方式工作。初步分析表明其在中南部地区全年能耗低于风冷热泵机组，具有一定的应用价值，可作为空调冷热源方案的一种新选择。     

半封闭活塞式和螺杆式冷水机组性能比较

半封闭活塞式和螺杆式冷机组以其各自鲜明的特点得到了广泛的应用。文章分析了开利半封闭活塞式和螺杆式冷水机组的特点,对比在不同温度和不同冷量下的性能,为实际使用打下基础。     

某宾馆空调冷源方案的比较

介绍了浙江省绍兴市某宾馆改造过程中,对三种空调冷源方案从初始投资和运行费用两方面进行了比较：一是风冷热泵冷水机组（单冷）;二是螺杆式冷水机组;三是溴化锂冷水机组。结果第一种方案最符合要求。     

螺杆式冷水机组在空调系统中的应用分析

叙述了双螺杆和单螺杆式冷水机组的特点,螺杆式冷水机组的容量调节的方式,以及各种螺杆式机组的适用条件,为空调工程设计中冷水机组的选择提供了一定的借鉴.     

Steady-state simulation of screw liquid chillers

In order to predict the performance of screw liquid chillers in a wide range of configuration parameters and operating conditions, a steady-state simulation model is presented, which is suitable for non-economized and economized chillers. The model includes sub-models for key components, such as non-economized compressor, economized compressor, shell-and-tube condenser, expansion valve, and flooded evaporator. Sequential modular method and successive substitution methods are combined together to carry out the simulation of the chillers. The convergence properties of this simulation technique are also analyzed. The present model can predict the performance within ±10% for large scale of cooling capacity including four specifications of non-economized chillers and three specifications of economized chillers. With the validated model, a sensitivity analysis on the economizer system is made. It is found that the cooling capacity of screw liquid chiller can be increased apparently by adding the economizer, but only when the volumetric ratio of the first stage internal compression is greater than a certain value, the economized screw liquid chiller can gain a higher COP than that of the non-economized one at the same time.     

Modelling of improved energy performance of air-cooled chillers with mist pre-cooling

Air-cooled chillers are widely used to provide cooling energy and yet pragmatic and simple energy efficient measures for them are still lacking. This paper considers how their coefficient of performance (COP) can be improved by using mist to pre-cool ambient air entering the condensers. The benefit of this application rests on the decrease of compressor power resulting from the reduced condenser air temperature with insignificant consumption of water and pump power associated with the mist generation. Based on a simulation analysis of an air-cooled screw chiller operating under head pressure control, applying such mist pre-cooling enables the COP to increase by up to 7.7%. Precise control of mist generation rate and integration with floating condensing temperature control are the major challenges of using a mist system to maximize electricity savings. The results of this study will prompt low-energy operation of existing air-cooled chillers working for various climatic conditions.     

浅谈层燃煤炉改燃天然气技术

简述了层燃煤炉改燃天然气的原则及燃烧器布置的一般方法。指出：层燃煤炉改燃天然气后，燃烧效率和热效率均有明显的提高，环境效益特别显著；但也存在运行成本高，尾部受热面渗水等不足；建议在尾部增设凝结式换热，达到节能、节水、减少NOx排放和降低运行成本的目的。     

全燃和掺燃高炉煤气炉的比较研究

由于高炉煤气中含有大量的惰性气体 ,可燃成分少 ,发热值低 ,燃料产物的体积流量大 ,因而使大容量高压燃煤气锅炉各受热面的传热特性与燃煤锅炉相比发生很大的变化。针对 5 0MW高压锅炉全燃和掺燃高炉煤气2种炉型的特点进行了详细的分析讨论 ,并与燃煤锅炉进行了比较研究 ,阐述了燃用高炉煤气锅炉的热工参数、传热特性以及受热面布置的特点 ,为研究和设计燃用高炉煤气炉提供了可靠的实践数据和理论依据。     

螺杆式冷水机组群控策略

叙述了螺杆式冷水机组在冷冻/冷却水系统定流量情况下,低负荷或高负荷时,能效比均较低的特点,提出了一种在保证机组稳定、可靠运行的基础上,以系统总能效比为目标的螺杆式冷水机组群优化控制策略。     

Transient modeling of an air-cooled chiller with economized compressor. Part I: Model development and validation

Air-cooled chillers are widely used and the control design is important for the chiller performance and reliability under the varying operating conditions. A mathematical model is developed for a chiller with an economized screw compressor and to assist the controller design. The model covers both the economized mode and non-economized mode. The two modes can be automatically switched depending on the operating conditions. Comparisons made between simulations and experiments indicate that the model can reasonably simulate the transients of the chiller. Based on the validated model, a follow-up paper will describe its application to the controller design.     

卧式内燃燃油和燃气锅炉的结构和设计

讨论了卧式内燃燃油和燃气锅炉的总体结构和设计。提出燃油和燃气锅炉炉膛、尾部受热面和燃烧器设计的要求。     

燃气锅炉尾部烟道的防腐措施

介绍了燃气锅炉尾部烟道腐蚀的现象,介绍了腐蚀的原因,并且从结构和运行管理上提出了改进措施,改进方法同样适用于燃油锅炉。