Cost optimisation of AC-R134a and AC-diethyl ether pair vapour adsorption refrigeration systems

ABSTRACT

The thermoeconomic analysis comprises three major divisions, namely the estimation of exergy of all internal and external streams of VAR system, the estimation of investment and fuel cost and estimation cost rates of streams and the cost of product. The results obtained in the above individual divisions are explained in this paper. Finally, the cost of the product of both working pairs is estimated and compared. The results obtained in each stage of the total research are presented.     

建筑节能技术在施工中的应用

就目前施工中常用的围护结构保温技术加以论述,指出在大力推广现有保温技术的同时,要加强新型节能材料的开发和利用,从而使建筑节能真正得以实现。     

建筑节能应用技术

阐述在控制建筑物耗热量指标等方面的建筑节能应用技术，介绍建筑节能墙体，门，窗，屋面等方面的设计和热工指标以及北京地区建筑节能示范小区的作法。     

用于个人冷却的微型制冷系统研究现状

微电子机械系统(MEMS)的迅速发展,使过程机械装置的微型化和轻量化成为可能。与传统制冷装置相比,微型制冷系统的体积可以缩小到1/60以下。微型制冷系统可以广泛应用于特殊环境下的个人冷却。重点介绍了微型制冷系统在国内外的研究成果和研究进展,指出了当前存在的主要问题,并对今后的研究工作提出了一些建议。     

供暖节能新技术及其应用探微

结合国内供暖节能新技术的发展现状,对供暖节能新产品、新设备的主要类型进行了介绍,并对供暖节能新技术在循环水泵变频控制技术与提高锅炉整体负荷率方面的应用进行了阐述,以推动供暖节能技术的发展。     

谈建筑节能防火的对策

针对建筑保温材料的火灾隐患,从防火保温材料选用方面入手探讨解决方法,并指出防火保温材料替代易燃保温材料和采用新型自保温结构体系是处理建筑节能防火的根本之道,以指导实践。     

Improvement of solar-electric compression refrigeration system through ejector-assisted vapour compression chiller for space conditioning in subtropical climate

In this study, improvement was made for the solar-electric compression refrigeration system by incorporating the ejector design to a conventional vapour compression chiller within the system. Through year-round dynamic simulation, the performances of the ejector-assisted vapour compression chiller (EAVCC) were evaluated under the intermittent and changing supply of solar energy in the subtropical climate. In addition, the effect of three common refrigerants, R22, R134a and R410A on the EAVCC was assessed and compared. It was found that the coefficient of performance of the chiller was increased and the total primary energy consumption of the system was decreased for all the three refrigerants, in which the degree of enhancement from R134a was the most significant. It was also noted that the effect of R410A on EAVCC was not apparent, and the overall system energy improvement was marginal. With appropriate ejector design and refrigerant selection of the solar-electric compression refrigeration system, the reduction potential of year-round primary energy consumption could be more than 5%. This would be certainly helpful in promoting the application of solar air-conditioning for building use in the subtropical climate.     

建筑节能的几个途径与措施

通过对建筑节能含义、重要地位以及存在问题的分析,探讨了我国在建筑节能方面的节能措施,分别阐述了墙体、门窗、屋面等不同部位的节能措施,并对太阳能利用现状作了介绍,提出应结合国情和实际情况,综合利用各种节能技术,趋利避害。     

某管控中心节能技术选择与运用

论述了在高纬度严寒地区东西向大玻璃幕墙建筑的节能和营造舒适环境的技术措施,结合实例对玻璃幕墙的选用、幕墙遮阳系统、机电设备等方面进行分析和探讨,并提出了相应的解决方法,对今后同类玻璃幕墙工程具有一定指导意义。     

Modeling solar-driven ejector refrigeration system offering air conditioning for office buildings

A lumped method combined with dynamic model is proposed for use in investigating the performance and solar fraction of a solar-driven ejector refrigeration system (SERS) using R134a, for office air conditioning application for buildings in Shanghai, China. Classical hourly outdoor temperature and solar radiation model were used to provide basic data for accurate analysis of the system performance. Results indicate that during the office working-time, i.e., from 9:00 to 17:00, the average COP and the average solar fraction of the system were 0.48 and 0.82 respectively when the operating conditions were: generator temperature (85 °C), evaporator temperature (8 °C) and condenser temperature varying with ambient temperature. Compared with traditional compressor based air conditioner, the system can save upto 80% electric energy when providing the same cooling capacity for office buildings. Hence, the system offers a good energy conservation method for office buildings.     

某药厂冷冻系统设计缺陷及其补救

本文讨论了某厂冷冻系统设计上的几个缺陷及其对试车和运行的影响，并就相应的补救或解决措施提出了建议。     

一种新农村钢结构住宅节能墙体应用技术研究

介绍一种新农村钢结构住宅节能墙体系统的构造及特性,针对保温与防火性能关键指标要求,给出评价其防火性能的试验结论和热工计算方法,确定系统材料主要性能指标,简述其节点构造和施工做法,阐明其在农村钢结构住宅建筑工程中的应用关键技术。     

水头损失与管网漏损——浅谈新型节能降耗供水技术

本文论述了水头损失在管网运行中对电耗和漏损的重要影响，以及我们对此的分析，并提出了采用分时分压供水技术的解决方法。     

发展新型节能墙材 为重建家园做贡献

2008年5月12日,我国四川汶川突如其来的强烈地震灾害,给灾区人民的生命财产造成了重大损失,经济社会发展受到严重制约.中节能新材料投资有限公司作为国务院国资委麾下中国节能投资公司的下属企业,作为国内最大的新型节能墙体材料投资企业,按照中围节能投资公司的安排部署,遵照中砖协字[2008]16号"关于投资灾区发展新型节能墙体屋面材料重建家园的通知"文件精神,本着"灾后重建、建材先行"的原则,于2008年6月中下旬,组织相关人员先后多次赴成都地区进行考察,并通过与成都市经委、投促委、墙改办、建材协会、墙材协会等相关部门以及来自国内的业内多名专家广泛深入的交流与沟通,了解到成都地区烧结墙体材料的发展现状以及灾后重建对新型节能墙体材料的巨大需求情况,使我们深刻认识到,投资灾区,不仅可为灾后重建提供强有力的支援,而且还可发挥引领示范作用.2008年8月28日,我们在彭州市投资的、第一个支持灾后重建的节能环保项目举行了开工建设奠基仪式,项目建设工作全面展开.     

某卷烟厂联合工房空调系统节能设计

结合工程实例,以节能环保理念为指导,介绍了卷烟厂空调、通风等设备的选择要点、主要节能措施、设备运行情况及所取得的成效,以期对工程中空调、通风方案的选择提供参考。     

中国移动广东生产调度中心节能技术研究与应用

对原设计方案进行了优化研究,主要包括空调冷热源、空调通风系统和太阳能应用,分析了节能环保效益.     

喷油螺杆制冷压缩机换热分析与模拟

根据变质量热力系统的理论，在分析研究油、气、机体、转子间的换热效应及其参数关系的基础上，建立了换热的数学模型。     

某大厦集中空调系统节能运行探讨

总结了该大厦集中空调系统所采取的管理节电措施,介绍了采用的节能改造技术。     

我国绿色建筑给排水节能新技术的应用

从第二水源开发、热水供应系统开发与完善、新型节水设备推广等方面对建筑给排水节能新技术进行了深入的探讨,指出给排水节能技术的应用对实现绿色建筑,促进我国建筑可持续发展具有重要的作用.     

Whole building energy simulation and energy saving potential analysis of a large public building

This article explores how to use EnergyPlus to construct models to accurately simulate complex building systems as well as the inter-relationships among sub-systems such as heating, ventilation and air conditioning (HVAC), lighting and service hot water systems. The energy consumption and cost of a large public building are simulated and calculated for Leadership in Energy and Environmental Design (LEED) certification using EnergyPlus. American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) baseline model is constructed according to ASHRAE 90.1 standard and the comparison of annual energy consumption between ASHRAE baseline model and proposed model is carried out. Moreover, an energy efficiency (EE) model is built based on the design model. Meanwhile, other energy conservation measures (ECMs) such as daylighting dimming and occupant sensors are considered. The simulation results show 4.7% electricity consumption decrease but 6.9% gas consumption increase of the EE model compared to ASHRAE baseline model. In summary, the annual energy cost of the EE model is reduced by 7.75%.