室内低温热水地板辐射供暖系统的节能分析

本文阐述了低温热水地板辐射采暖分户热计量系统是一种易控、易调、节能的采暖系统,讨论了地板辐射供暖方式与其他方式在房间内人体热舒适方面的差异,并通过对其综合节能效果的考察,分析了地板辐射供暖系统不稳定供暖过程的数学模型,用数值计算的方法分析了间歇供暖条件下,达到室内要求温度所需的预热量与预热时间的关系。     

气液分离两翼式热管用于辐射采暖的特性分析

为了适应舒适的辐射采暖系统,降低低温地板辐射采暖系统的供水温度的需要,通过对传统热管工作原理及其结构的分析,发现传统热管应用于辐射采暖具有一定的局限性,针对传统热管用于辐射采暖的局限性,提出了一种低温地板辐射供暖用的新型热管的设计方案。该新型热管的特点在于实现了气相工质和液相工质相互独立流动,减小了流动阻力,避免了热管的携带极限、干涸极限等传热极限的发生;并且增大了蒸发段和冷凝段换热面积,使热水管道与地板层的换热量显著增加。该热管应用于低温地板辐射供暖系统可以增大换热面积、提高换热量、降低供水温度,从而达到节能的目的,同时,为太阳能等低品位能源直接应用于供暖系统的研究提供参考。     

太阳能热泵地板辐射供暖系统

太阳能热泵低温地板辐射供暖系统是将太阳能、水源热泵和地板供暖结合在一起的新型采暖方式。介绍了太阳能热泵低温地板辐射供暖系统的工作原理和构成,并以青岛地区为例,设计了太阳集热器、蓄热器、地板换热盘管等设备,探讨了系统的设计方法。     

热管用于空气源热泵地板辐射采暖系统的优化实验研究

为了提高空气源热泵地板辐射采暖系统的供暖效率,将导热能力极强的热管用于空气源热泵地板辐射采暖系统并对其进行了优化实验。该实验是在热管管间距为15 cm时,对50 cm x 50 cm x 40 cm的房间模型的地板进行加热,分别测试了热源温度为40、45和50℃时,混凝土板块的温度和房间模型的温度,并研究了混凝土板块和房间模型的供暖效果。经过比较分析,得出随着热源温度的升高,供暖效果提高,且热源温度为45℃和50℃能达到相似的效果。在实际应用中,对于该系统,选择合适的热源温度尤为重要。     

间接连接和混水连接联合应用的供暖系统调节控制方式分析

为了解决供暖系统中同时存在散热器供暖及地板辐射供暖用户时,地板辐射供暖用户过热的问题,提出了地板辐射供暖系统采用混水连接的供热方式,分析供热系统的调节曲线及混水站控制方式,给出混水泵混水比的变化曲线。结合工程实例计算分析得出,混水连接方式能很好解决不同供暖方式联合应用的问题,并且相对间接连接供暖方式水泵运行能耗明显降低。     

利用价值工程分析地板辐射供暖系统的经济性

利用价值工程经济评价方法对地板辐射供暖方式与散热器供暖的经济性进行比较分析，得出了地板辐射供暖方案要优于散热器供暖的结论。     

低温地板辐射供暖节能作用分析

低温地板辐射供暖地板与外围护结构内表面存在辐射换热，散热器供暖房间的散热器附近以及散热器上部热气流与外围护结构存在热流短路。文章在低温地板辐射供暖室比散热器供暖房间室内设计温度降低2℃的情况下，分别对三个典型地区这两种供暖方式在上述情况下造成的房间热负荷和供暖季平均耗热量进行计算。结果表明此条件下，低温地板辐射供暖房间的热负荷可降低10％～15％，节能率约为15％～20％。     

基于火用分析的供暖末端设备节能性研究

探讨了散热器、供暖地板、风机盘管、毛细管辐射平面等4种室内供暖末端设备的采暖特点;阐述了4种采暖设备的传热机理及热舒适性;利用火用分析方法进行能量计算。计算结果显示,毛细管辐射平面空调系统可比低温地板辐射采暖系统节能52.82%。供暖末端设备的节能分析为供暖工程设计提供一定的理论参考。     

电热膜与地热采暖方式的对比

低温辐射电热膜供暖与低温地板辐射供暖是分户计量的两种主要形式。本文对二者各选择一个典型居室在两方面进行对比:24h的竖向温度场、相对湿度实测研究对比;一个采暖期的经济运行的实际测算对比。结论表明,目前二者各有利弊,而长远看低温地板辐射供暖将更有优势。     

一种新型的供暖方式——地板辐射供暖

简要介绍了地板辐射供暖系统的原理,并与传统的供暖方式作对比,被认为是目前最理想的一种供暖方式,市场前景广阔。     

A parametric study on radiant floor heating system performance

Efficient radiant heating systems are promising technologies for energy saving in commercial and building sectors together with improving occupant thermal comfort. However, the thermal performance of radiant systems in buildings has not been fully understood and accounted for in currently available building energy simulation software. In this paper, the effects of design parameters on performance of a typical radiant floor heating system have been studied using finite element method. A radiant heating system includes a number of pipes filled with hot water. Therefore, several design parameters such as pipe diameter, type (material), number, thickness and cover of system are affected on the value of transferred heat. In this study, transient conduction, convection and radiation heat transfer mechanisms are considered meanwhile analyzing the typical problem by using a finite element method solver. It is noted that the type and thickness of the floor cover are the most important parameters in the design of radiant heating systems.     

低温地板辐射采暖构造层传热模拟

本文针对以哈尔滨为代表的寒冷地区的低温热水地板辐射供暖系统的传热特点和铺设方式，建立了构造层内传热过程的数学模型，分析了低温热水地板辐射供暖系统的热工性能，确定了构造层内温度分布、地板表面温度分布、单位面积散热量等设计指标与管间距、水温、表面材料之间的定量关系。     

Numerical and experimental analysis of floor heat storage and release during an intermittent in-slab floor heating process

In this paper, the floor heat storage in the preheating period and the heat release in the intermittent period during an intermittent in-slab floor heating process are investigated. Numerical simulations are used to determine the effect of the design and operating parameters, i.e., the pipe spacing, the filling layer thickness and the pipe water temperature, on the floor heat storage and heat release. The relationship between the intermittent time and the preheating time is also obtained. The results show that pipe spacing has the dominant effect on the preheating time. In the intermittent period, 2 h later, the two-dimensional heat transfer process can be modeled as a one-dimensional vertical heat transfer process, and the filling layer thickness has a relatively large effect on the heat release time. The numerical simulation method is shown to be accurate to at least within 7% of the experimental measurements.     

Fuzzy controlled central heating system

In this paper a comparison study was carried out in order to understand how two different systems, classical and fuzzy logic control of central heating affect the economy and comfort of private homes or offices. Also a literature review was done to help decide which one of these systems is more effective. The objective of the fuzzy controller heating system is to estimate the actual heat requirement of the house. It uses a total of five inputs, four of which are derived from energy consumption curve, using conventional digital filtering techniques; the fifth is the average outdoor temperature, whereas, the classical control system burns diesel type fuel in its furnace to heat the water supply (boiler). From the boiler, the hot water is distributed by a pipe system to the individual radiators in the house. Thereby, it is shown that the fuzzy controlled heating system is more effective, also it maximizes the economy and the comfort of the consumer. Copyright © 2002 John Wiley & Sons, Ltd.     

The effect of solar radiation on dynamic thermal performance of floor heating systems

This paper presents a numerical investigation of transient heat transfer in floor heating systems using a three-dimensional explicit finite difference model. The study focused on the influence of the cover layer and incident solar radiation on floor temperature distribution and on energy consumption. Complete and partial (area) carpets were considered as well as hardwood cover layers over concrete or gypcrete thermal storage. Experimental and simulation results for an outdoor testroom reveal that solar beam radiation can cause a local floor surface temperature in the illuminated area 8°C higher than that in the shaded area. Partial carpet cover further increases floor surface temperature differences up to 15°C when solar radiation is absorbed. Solar radiation stored in the floor thermal mass was found to reduce heating energy consumption significantly (30% or more). Increase of thermal mass thickness from 5 cm to 10 cm did not lead to higher energy savings with conventional proportional-integral control. Advanced control algorithms need to be developed to maximize energy savings while maintaining good thermal comfort.     

浅析火炕与低温地面辐射供暖住宅的生态节能性

调查表明火炕仍然是我国北方小城镇和农村住宅中最重要、最有效的供暖设施;新建的城市住宅中低温地面辐射供暖逐渐普及,其原因在于辐射供暖具有供热均匀、热舒适性好、散热体蓄热性强、节能明显等优点。文中对比普通的暖气供暖,分析了住宅中火炕与低温地面辐射供暖的独特优势,各自的适用场合。最后提出了推广应用火炕与低温地面辐射供暖的建议,以及对火炕的改进建议。     

Energy supply performance and environmental load‐reduction effect of a cogeneration system for an apartment building using distributed heat storage technology

In order to make distributed generation systems for apartment buildings economically viable, it is essential to develop an efficient and low‐cost heat supply system. We are developing a new cogeneration system (Neighboring CoGeneration system: NCG system). The key concept of this system is to install a heat storage unit for the hot water supply, floor heating, and bath heating in each house, and to connect the heat storage units by a single‐loop hot water pipe. The system leads to time leveling of the total heat supply and reduced installation costs. Furthermore, it is expected that the cogeneration can operate according to electrical demand because of the large heat storage capacity of the system. In this study, a dynamic simulation model is developed to evaluate the performance and environmental load‐reduction effect of the NCG system for 50 households. The results show that the NCG system can supply sufficient heat for peak demand in winter and reduce annual CO₂ emissions by 23% on average. © 2013 Wiley Periodicals, Inc. Heat Trans Asian Res, 42(8): 745–757, 2013; Published online in Wiley Online Library ( wileyonlinelibrary.com/journal/htj ). DOI 10.1002/htj.20376     

电厂蒸汽长距离供热分析

随着经济的快速发展,供热市场潜力巨大,且多以稳定的生产工艺热负荷为主.但电厂与热用户之间的距离相对较远,国家现行的供热相关标准已经不能满足工业快速发展的现状,所以迫切需要解决长距离供热问题.通过数值计算得到管道内部蒸汽流动时压力和温度随长度的变化关系,然后利用计算机编程计算出机组在不同抽汽参数和输送管径下的供热距离并进...     

新型地板辐射供冷暖系统的理论研究

提出了一种新型地板辐射供冷暖系统,通过综合利用墙体和地板的导热,仅将金属管路布置在踢脚线内,并采取强化传热措施,即可满足室内供能需求.建立了该系统的理论模型,并用有限元方法对其传热性能进行了数值模拟.研究结果表明:该系统供能效果良好,冬季采用40℃供暖介质便能满足保温的节能后居住建筑的供冷暖需求,夏季用10℃制冷介质即可满足该房间的制冷需求;地板辐射面提供热量约占60%;系统供能能力受埋管管径、介质温度及强化传热的材料等因素的影响,其中介质温度的影响最为明显.