废水源热回收热泵使用前景分析

本文分析了废热水排放企业和公共浴室的给水和排水现状,.介绍了废水源热回收热泵的工作原理和特点,从不同角度分析了使用废水源热回收热泵的前景和重大意义.     

废热驱动热管溴化锂制冷机的比较

利用热力学第一定律的热力平衡方法和热力学第二定律的火用分析方法,分别对单级单效、单级双效和两级热管废热回收双效溴化锂制冷系统的热力系数和火用效率进行比较。结果表明：不管从热经济性角度,还是从能源利用的完善性（[火用]效率）与合理性（能级匹配）角度,两级热管废热回收双效溴化锂制冷系统都更具合理性和实用性。     

高校公共浴室废水余热回收间接换热分析

针对高校公共浴室废水余热回收和利用,设计间接换热过程。基于废水排放量动态特征,建立间接换热过程数学模型,并进行动态模拟。结合实测废水排放量动态变化,分析换热过程参数变化,并提出冷水侧流量调节控制策略。结果表明,制定的策略既能够充分满足换热要求,又能够降低冷水侧水泵的运行能耗。     

Conceptual design and performance analysis of absorption heat pumps for waste heat utilization

The potential of the absorption cycle for recovering low temperature waste heat (60°C) as a first step towards the construction of a working system to provide process heat is assessed. The system is considered with lithium chloride-, lithium bromide-water solutions as working fluids.     

Synthesis of energy-induced waste minimization networks (EIWAMINs) for simultaneous waste reduction and heat integration

 This article introduces a process synthesis methodology for identifying cost-effective Energy-Induced Waste Minimization Networks (EIWAMINs). The synthesis methodology is targeted toward retrofit designs for an existing plant or site where environmental emissions (aqueous or gaseous) must be reduced. This approach uses heat-induced separation units that separate mass via a phase change (condensers, dryers, crystallizers, evaporators, etc.) and heat exchangers to simultaneously address waste minimization and heat integration within a large plant or site. While heat-induced separators may be employed for optimal waste separation and allocation (via a phase change), heat exchange equipment (e.g. heaters, coolers, chillers, etc.) may be employed to improve the thermodynamics of existing unit operations. In addition, pressurization/depressurization devices (compressors, turbines, etc.) are also employed to enhance the effectiveness of the heat-induced separators. The problem is tackled via two mathematical formulations which are mixed-integer non-linear programs (MINLPs). The mathematical formulations are combined to identify the most cost-effective design(s) that simultaneously addresses the plant waste minimization and heat integration tasks. Linearization techniques and graphical insights are incorporated to simplify the mathematical formulation of the problem. A case study is provided to highlight the features of this design procedure and its economic merits against several alternative designs. Received: 19 November 1998 / Accepted: 21 January 1999     

A desalination battery

Water desalination is an important approach to provide fresh water around the world, although its high energy consumption, and thus high cost, call for new, efficient technology. Here, we demonstrate the novel concept of a "desalination battery", which operates by performing cycles in reverse on our previously reported mixing entropy battery. Rather than generating electricity from salinity differences, as in mixing entropy batteries, desalination batteries use an electrical energy input to extract sodium and chloride ions from seawater and to generate fresh water. The desalination battery is comprised by a Na(2-x)Mn(5)O(10) nanorod positive electrode and Ag/AgCl negative electrode. Here, we demonstrate an energy consumption of 0.29 Wh l(-1) for the removal of 25% salt using this novel desalination battery, which is promising when compared to reverse osmosis (~ 0.2 Wh l(-1)), the most efficient technique presently available.     

三冲量控制在加热炉余热回收系统中的应用

本文重点介缉三冲量控型在邯钥2250热轧厂加热炉余热回收系统中的应用。通过对三冲量控制的研究与实践,从控制系统方面解决了在加热炉余热回收系统中汽包出现假水位的现象。     

某大酒店废水热量回收分析

针对酒店蒸汽冷凝水大多未被利用的情况,定量分析不同条件下蒸汽凝结水利用方案,并进行节能计算和分析。     

Theoretical approximation to transient heat conduction in nuclear waste repositories

Comparison is made between the numerical solution for temperature histories at a nuclear waste site and the analytical solution of a correlated thermal problem. The differences between both solutions are found. Both problems are nonlinear diffusion problems connected with the disposal of nuclear wastes.     

Estimation of waste heat and its recovery potential from energy-intensive industries

Clean Technologies and Environmental Policy - The recovery and reuse of waste heat offers a significant opportunity for any country to reduce its overall primary energy usage. Reuse of waste heat...     

利用低位余热的喷射式制冷机性能研究

研究使用氟利昂作为工质的喷射式制冷机的性能，编制计算机仿真程序，分析状态参数对制冷循环性能的影响。计算结果表明这一装置可以用低位余热驱动，适用于空调系统。     

太阳能/余热固体除湿冷却系统研究

提出并研制一种太阳能／余热驱动除湿冷却系统。系统包括2台内冷却紧凑式固体除湿器、热交换器、蒸发冷却器等部件。在不同工况下对系统的性能进行模拟计算，分析再生温度、热交换器效率及蒸发冷却器效率对系统性能的影响。     

CO2 heat pump for waste heat recovery and utilization in dairy industry with ammonia based refrigeration

Based on field data from a medium scale ammonia based milk refrigeration plant located in northern India, a trans-critical CO₂ heat pump system with IHX is conceptualized for waste heat utilization. The waste heat is utilized to pre-heating the boiler feed water and thereby reduces energy consumption. A thermodynamic model of the refrigeration system is built and simulated for year-round field data. In this study, the condenser of the ammonia based refrigeration system is coupled with the evaporator of the proposed CO₂ heat pump which is maintained at 20 °C year-round. The heat pump delivers heat at about 70 °C to pre-heat the boiler feed water drawn from underground source and is available in temperature range of 25 °C to 29 °C year-round. Thus, the CO₂ heat pump performance is essentially independent of variation in ambient temperature. We reported reduction in CO₂ emission and reduction in total energy cost by approximately 45.7% and 33.8% respectively. Economic analysis shows the payback period (PBP) is about 40 months.