水冷式制冷机组的性能比较及选型

分析了水冷活塞式、螺杆式和离心式冷水机组的特点，介绍了不同厂家制造的一些代表性的水冷活塞式、螺杆式和离心式冷水机组在名义工况下的性能，总结了他们各自的适用范围和COP值大小，可供实际使用和选型参考。     

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。     

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.     

永磁同步变频螺杆式冷水机组

1基本信息产品名称:永磁同步变频螺杆式冷水机组规格型号:LHVE系列产品类型:制冷与空调类生产企业:珠海格力电器股份有限公司2企业介绍珠海格力电器股份有限公司是全球先进的集研发、生产、销售和服务于一体的专业化空调企业。公司注册资金601573.0878万元人民币,公司现有9万多名员工,其中有1.5万名研发人员和3万多名技术工人。2019年,公司全年实现营业总收入2005.08亿元。     

带热回收的水冷螺杆式冷水机组

正1设备简介:上海阿尔西空调系统服务有限公司(以下简称阿尔西公司)的型号为HYDROCOOL SCREW W HEF 340V1系列产品,通过了上海市节能产品评审委员会的评审,荣获2013-2016年上海市节能产品称号。本节能产品为中央空调用水冷螺杆式冷水机组(带热回收),配置了高效热回收装置,具有制冷效率高,出热水效果好,并能降低冷却塔功耗的一种多功能机型。该机组可以广泛应用于酒店、医院、写字楼、休闲娱乐场所、生产工艺要求等同时需要     

有限速率过程对活塞式斯特林发动机性能的影响

本文讨论在给定热源温度和压缩比的情况下,过程进行的速率有限,并受热传导不可逆影响的内可逆活塞式斯特林发动机的最优性能,导出以理想气体或范德瓦尔斯气体为工质的斯特林发动机的最大输出功率与热效率的关系,以及最大热效率与输出功率的关系,并推出了一些新的有限时间热力学的性能界限。     

变频节能技术在螺杆式制冷主机循环水泵上的应用

详细介绍了一项变频节能项目,针对不同的制冷主要用不同的控制方式,对中央空调循环水泵进行变频节能控制,取得了较好的经济效益和社会效益。     

部分负荷性能对冷水机组运行能耗的影响评价

冷水机组的运行能耗与其部分负荷性能有关。本文论述了部分负荷性能对冷水机组运行能耗的影响,认为要降低冷水机组的运行能耗,必须选择部分负荷性能好的冷水机组。     

一种先进的离心式制冷机：美国开利公司19DM型离心式冷水机组综述

本文在介绍了美国开利公司19DM型离心式冷水机组的概况之后,着重分析了其“可调气动压缩机”是如何保证该机组在宽广的工况范围内实现高效、稳定运行的,并将这种具有双重调节机构的压缩机与普遍仅调节进口导叶的压缩机作了较深入的比较。     

浅谈部分负荷性能对冷水机组节能运行的影响

通过对由两台离心式冷水机组组成的制冷系统在不同运行方案下的能耗分析,指出部分负荷性能对冷水机组节能运行的影响,并提出节能运行方案。     

小型风冷式冷热水机组的现状和发展

小型风冷式冷热水机组以其一机两用、微电脑控制自动运行、安装方便，一台机组带多台分离安装的末端设备、可同时调节多个房间的温度、机组可安装于室外阳台的隐蔽处、以及兼具有大型中央空调系统和家用空调器的优点等特点，较好地满足了市场的需求，受到了用户的青睐，在住宅、别墅、商场、餐厅、写字楼等处采用愈来愈多。文章说明了小型风冷式冷热水机组的分类，叙述了小型风冷式冷热水机组的特点，介绍了小型风冷式冷热水机组的制冷和控制系统，阐述了小型风冷式冷热水机组性能提高途径，为小型风冷式冷热水机组的发展奠定了基础。     

Performance comparison investigation on solar photovoltaic-thermoelectric generation and solar photovoltaic-thermoelectric cooling hybrid systems under different conditions

The performance of solar photovoltaic-thermoelectric generation hybrid system (PV-TGS) and solar photovoltaic-thermoelectric cooling hybrid system (PV-TCS) under different conditions were theoretically analysed and compared. To test the practicality of these two hybrid systems, the performance of stand-alone PV system was also studied. The results show that PV-TGS and PV-TCS in most cases will result in the system with a better performance than stand-alone PV system. The advantage of PV-TGS is emphasised in total output power and conversion efficiency which is even poorer in PV-TCS than that in stand-alone PV system at the ambient wind speed u_w being below 3 m/s. However, PV-TCS has obvious advantage on lowering the temperature of PV cell. There is an obvious increase in tendency on the performance of PV-TGS and PV-TCS when the cooling capacity of two hybrid systems varies from around 0.06 to 0.3?W/K. And it is also proved that not just a-Si in PV-TGS can produce a better performance than the stand-alone PV system alone at most cases.     

A performance comparison between an air‐source and a ground‐source reversible heat pump

In this study, the performance of a reversible ground‐source heat pump coupled to a municipality water reticulation system, is compared experimentally and with simulations to a conventional air‐source heat pump for space cooling and heating. A typical municipality water reticulation system comprises hundreds of kilometres of pipes designed in loops that will ensure adequate circulation of water. This results in a substantial heat exchanger with great potential. Indirect heat transfer occurs between the refrigerant and ground via the municipality water reticulation system that acts as the water‐to‐ground heat exchanger. The experimental and simulated comparisons of the ground‐source system to the air‐source system are conducted in both the cooling and the heating cycles. Climatalogical statistics are used to calculate the capacities and coefficients of performance of the ground‐source and air‐source heat pumps. Results obtained from measurements and simulations indicate that the utilization of municipality water reticulation systems as a heat source/sink is a viable method of optimizing energy usage in the air conditioning industry, especially when used in the heating mode. Copyright © 2001 John Wiley & Sons, Ltd.     

Performance comparison of different combined heat and compressed air energy storage systems integrated with organic Rankine cycle

Compressed air energy storage (CAES) is promising to enable large‐scale penetration of renewable energies (REs). However, conventional diabatic CAES (D‐CAES) depends largely on fossil fuels, while adiabatic CAES (A‐CAES) is limited in output power. To conquer these disadvantages, concept of combined heat and CAES (CH‐CAES) is proposed in this paper. The proposed system couples an electric heater with conventional A‐CAES. During charging, electricity storage transforms from pure compression to partly relying on Joule heating. The stored heat in an electric heater will be used to boost turbine inlet temperature during discharging. Consequently, system charge/discharge capacity can be improved without enlarging cavern size, raising cavern pressure, and producing greenhouse gases. This paper discusses three types of CH‐CAES systems with different electric heater installation positions. Off‐design performance analysis for each system is conducted on the basis of turbomachinery (compressors, turbines, and the pump) characteristic maps and heat exchangers off‐design models. Performance comparison is conducted between these three CH‐CAES systems (called Mode II, III, and IV for simplification) and the conventional A‐CAES system (Mode I). Control strategies are also given in this paper. Results show that the EVR (energy generated per unit volume of storage) increases with participation of an electric heater, while the RTE (system roundtrip efficiency) slightly decreases. Mode I has the highest RTE. The largest EVR appears in Mode III where the electrical heater is in series with the intercooler and after cooler. Mode II is a compromise solution to achieve both relatively high RET and EVR when the electrical heater is installed in series only with the intercooler. Mode IV with a paralleling electrical heater has great flexibility to adapt different user demands. The integration of the ORC has a positive effect on system RTE and EVR.