1MW塔式太阳能电站蓄热系统模拟分析

以1MW塔式太阳能电站蓄热系统为研究对象,通过理论分析,建立了管壳式换热器、热罐、冷罐以及蒸汽蓄热器的动态数学模型,经验证模型具有合理性.在此基础上对蓄热系统的充、放热过程进行了模拟计算,分析研究了换热器A和C的动态特性、冷热罐内油温的动态变化以及蒸汽蓄热器的充、放热特性.模拟结果为双级蓄热系统的过程控制提供了理论依据.     

蒸汽喷射泵式蓄热器实验研究

运用实验方法首次对蒸汽喷射泵式蓄热器进行了实验研究。实验结果表明,和常规蓄热系数相比,蒸汽喷射泵式蓄热器具有较强的锅炉负荷平衡能力;能有效提高蓄热器单位水容积的蓄热量,并具有较强的锅炉负荷调节能力,可取代常规蓄热系统中的电动调节阀,在实际应用中进行负荷调节。     

核动力装置安全系统中喷射泵工作过程模拟

建立了以蒸汽为工作流体的喷射泵工作过程的一维稳态数学模型。采用数值计算方法,针对应用于核动力装置被动安全系统的喷射泵参数,计算了汽-液喷射泵内轴向压力分布和不同参数下的喷射泵工作性能。结果表明,本模型得到的喷射泵性能与实测值很接近,可以用于蒸汽喷射泵的计算分析。     

大型电站凝汽器动态数学模型的研究

在对凝汽器工作过程中工质物性合理简化的基础上，详细论述了建立凝汽器动态数学模型的机理；讨论了蒸汽凝结量的两种计算方法，并将计算结果与现场设备调试曲线进行对比。通过在电站仿真工程中的应用，证明本文所建立的动态数学模型在仿真领域具有较高的实用价值。     

蒸汽蓄热器设计要点及案例分析

为提高蒸汽蓄热器设计质量,从基本结构和工作原理入手,对其设计选型过程中涉及的诸如蓄热容积、蓄热量、喷头数量以及充、放热特性等参数进行分析.在此基础上,对闪蒸量为54 t/h的蒸汽蓄热器进行设计计算,所得结果可供特殊试验目的用蒸汽蓄热器的设计作参考.     

MSF多级闪蒸海水淡化系统的建模与仿真

通过对MSF多级闪蒸过程的机理分析，建立了完整的动态数学模型，与其它文献提供的模型比，考虑了蒸汽密度和级间闪蒸盐水流量变化的影响，仿真计算结果真实地反映了MSF系统动态过程的非线特性。     

蒸汽蓄热器充汽过程建模仿真及优化设计

为了深入分析蒸汽蓄热器充汽过程,提出利用建模仿真的方法对充汽过程进行分析,通过建立蒸汽蓄热器充汽过程数学模型,搭建基于Simulink的仿真模型,仿真分析液侧对流强度、汽液交界面换热系数以及汽侧对流强度对于充汽过程的影响。结果表明,液侧对流越强,汽液交界面换热系数越大,汽侧对流越强,充汽过程达到饱和状态越快。因此通过强化液侧对流和汽侧对流换热能够加快蒸汽蓄热器充汽过程,对于蒸汽蓄热器优化设计具有指导意义。     

蒸汽蓄热器在铜冶炼余热发电系统上的应用

结合项目实例介绍蒸汽蓄热器在铜冶炼余热发电系统上的应用、蓄热器容积计算、采用蒸汽蓄热器的效益.     

高压蓄热器在工厂热电冷联供系统中的应用

蒸汽蓄热器是国家大力推广的节能产品，其既可提高锅炉燃烧效率节约能源又可减轻运行人员劳动强度，具有巨大的市场潜力。本文阐述了高压立式蓄热器在热电冷联产系统中的应用。分析了应用蓄热器后节能、锅炉和车间蒸汽压力稳定及其他方面产生的经济效益。     

1MW塔式太阳能电站换热网络的动态模拟

以1 MW塔式太阳能热电站蓄热系统的换热器网络为研究对象,通过理论分析,建立了管壳式换热器的动态数学模型,并验证了该模型及计算方法的合理性.在此基础上,采用模块化仿真方法分析了充、放热过程中受到入口温度、流量以及流量和温度同时扰动时,换热器A和C的动态特性.结果表明:换热器A和C都具有较大的热惯性,其动态响应时间分别约为30 min和20 min;在蒸汽进口温度的扰动下,换热器A和C导热油与蒸汽出口温度均无响应时滞;在导热油入口温度的扰动下,换热器C导热油出口温度存在响应时滞.     

The design and experimental verification of heat exchanger accumulators used in small commercially available air conditioning systems

This study involves the mathematical modelling and experimental verification of a heat exchanger accumulator. The study was initiated with a literature survey which, according to the authors, revealed that there was no published material that described how heat exchanger accumulators are designed to ensure that they are correctly sized according to the operating system and conditions. The heat exchange process that takes place within the heat accumulator was studied and a mathematical model of a heat exchanger accumulator developed. This model was used to develop a universal design procedure that correctly sized the heat exchanger accumulator according to the operating system into which it was to be installed. The model was then verified by conducting experimental tests and it was concluded that the model could be used to successfully design and implement heat exchanger accumulators into small commercially available air conditioning systems. Copyright © 2001 John Wiley & Sons, Ltd.     

蒸汽蓄热器升温过程的分析计算与实验研究

蒸汽蓄热器升温过程是一个动态的传热传质过程。对蓄热器模型进行了实验研究与分析，探讨了壁温变化规律，所得结果可供设计太阳能发电用蓄热器参考。     

The steady-state modeling and optimization of a refrigeration system for high heat flux removal

Steady-state modeling and optimization of a refrigeration system for high heat flux removal, such as electronics cooling, is studied. The refrigeration cycle proposed consists of multiple evaporators, liquid accumulator, compressor, condenser and expansion valves. To obtain more efficient heat transfer and higher critical heat flux (CHF), the evaporators operate with two-phase flow only. This unique operating condition necessitates the inclusion of a liquid accumulator with integrated heater for the safe operation of the compressor. Due to the projected incorporation of microchannels into the system to enhance the heat transfer in heat sinks, the momentum balance equation, rarely seen in previous vapor compression cycle heat exchangers modeling efforts, is utilized in addition to the mass and energy balance equations to capture the expected significant microchannel pressure drop witnessed in previous experimental investigations. Using the steady-state model developed, a parametric study is performed to study the effect of various external inputs on the system performance. The Pareto optimization is applied to find the optimal system operating conditions for given heat loads such that the system coefficient of performance (COP) is optimized while satisfying the CHF and other system operation constraints. Initial validation efforts show the good agreement between the experimental data and model predictions.     

Modeling the heat balance of a solar greenhouse with a passive heat accumulator

A model of heat balance of a solar greenhouse with a passive water accumulator in the system soil-plants-heat accumulator-air-fencing-atmosphere is presented. The heat of moisture evaporation from the soil surface and plants is defined using the Bowen-Penman method.     

Energy analysis of heat surplus storage systems in plastic tunnels

This paper presents the findings of a theoretical analysis and experimental verification on the storing of heat excess in soil and liquid accumulators located in a foil tunnel. There was positive verification of the formulated macroscopic heat exchange model in both accumulators (maximum error 81%) and the quantity of heat stored in them was defined. During the experiments, under existing weather conditions, the amount of stored heat stood between 6 MJ and 45 MJ in the liquid accumulator and between 9 MJ and 130 MJ in the soil accumulator. The quantity of heat supplied from the accumulator to the interior of the tunnel during discharging, which stood between 0.6 MJ and 46 MJ, was also described. The COP was determined for the tested system both for the accumulator charging process and the discharging of the soil accumulator. Furthermore, the quantity of heat used for heating up heat originating from the discharging of the accumulator whilst heating the tunnel for favourable and unfavourable surrounding climate conditions was determined.     

The hydrodynamic characteristic of a layer of plastic bottles as elements of a water heat accumulator

A hydrodynamic model of a water heat accumulator made of plastic bottles is described. Rows of plastic bottles on lattice shelves are regarded as stationary layers of coarse packing. The granulometric and hydrodynamic characteristics of a packing of plastic bottles as heat-retaining elements in a solar heating system are determined.     

蒸汽蓄热器容积最优化研究

建立了蓄热器必需热量最小化的算法模型，并将计算机程序应用于一个实例。计算结果显示了该程序能找到往往比手工计算的结果小得多的最小必需蓄热量，为蓄热器容积最小化，从而为其工程方案的优化创造了条件。     

Theoretical research of a silica gel–water adsorption chiller in a micro combined cooling,heating and power (CCHP) system

A novel micro CCHP system, which is based on a two bed silica gel–water adsorption chiller, is constructed in this work. To reveal the chiller characteristic in this system, a transient model of the adsorption chiller is developed. According to the comparison of the simulated results and experimental data, the presented model shows a good performance in predicting the chiller performance, with both stable and variable heat source temperature. With the analysis of simulated results, it is found that the cooling capacity and the coefficient of performance (COP) of the chiller are influenced significantly by the average value and variation rate of electric load, as well as the average value of cooling load. The water tank also shows a great effect on the chiller performance. To get better performance of the chiller, the water tank should be adopted when the electric load is low or its variation rate is positive, and should not be utilized when the electric load is high or its variation rate is negative. A 500 L water tank is recommended in order to get better performance and acceptable start-up time. Furthermore, to get better performance as well as higher security, a cold accumulator should be adopted.     

Simulation and verification of lithium-ion battery temperature changing process

针对软包锂离子电池放电过程中温度变化过程进行研究,依据电池产热基本理论,通过内阻实验及0.5 C放电倍率下的温升实验计算出瞬态生热率曲线,得出电池熵热系数,建立生热速率随放电深度不断变化的瞬态生热模型,基于该模型进行不同放电倍率的温度仿真模拟,并与实验进行对比。结果表明,温度变化模拟结果与实验相吻合,生热率变化模拟结果与实验计算值相符合,模型可以很好地模拟电池在不同放电倍率下的温度变化,对电池温升过程分析及电池热管理过程控制具有指导意义。