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％。     

低温地板辐射采暖传热特性研究

为了揭示低温地板辐射供暖的传热特性,利用Fluent软件和k-ε湍流模型对低温地板辐射采暖系统的温度场进行数值模拟.搭建电热地板辐射采暖实验系统,进行室内温度场的测量和数值模拟,通过实验测试值及模拟值的对比分析,验证数值模拟的正确性.建立低温热水地板辐射采暖物理模型,对不同供水流速和供水温度进行地面温度分布、地板层温度...     

太阳能低温热水地板辐射供暖系统的研究

低温地板辐射供暖具有舒适、节能、清洁等许多优点，这种供暖方式已在我国北方得到广泛的应用。研究、开发廉价和清洁的辐射供暖的低温热源－太阳能，对于大面积推广低温辐射供暖系统具有十分重要的意义。     

采用散热器和低温地板辐射供暖的室内热环境与能耗研究

建立了供暖房间室内空气自然对流二维空气湍流流动与传热数学模型，利用PHOE—NICS3．3计算软件对低温地板辐射供暖房间和散热器供暖房间的温度场进行了仿真模拟。建立了供暖房间热过程数学模型，对两种房间进行了编程计算。两个模型计算结果反映了低温地板辐射供暖房间的室内热环境优于散热器供暖房间。根据各自热环境特点，计算了两种房间的能耗。发现低温地板辐射供暖房间比散热器供暖房间节能109／6～129／6，其节能的主要原因是消除了空气局部高温区，避免了外围护上的附加传热量。     

地板辐射供暖应用分析

阐述低温地板辐射供暖系统具有室内舒适性好、不占用室内使用面积等优点,也指出系统存在初投资高、运行成本高、维修困难、层间传热损失大等不足。通过工程项目方案论证的方法,针对地板辐射供暖系统的初投资成本、运行成本、使用效果、安装和使用中出现的问题,对地板辐射供暖与传统的散热器供暖进行比较与分析,并结合运行管理经验,阐述地板辐射供暖优缺点及适宜应用的条件,综合分析得出散热器供暖系统的整体经济性优于地板辐射供暖系统的结论。     

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。     

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。     

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。     

太阳能-水源热泵多能互补供暖系统实验研究

设计搭建新型太阳能-水源热泵多能互补地板辐射供暖系统,并在室外环境条件基本相同的条件下,与传统城市集中供暖系统进行对比实验。结果表明:采用新型太阳能-水源热泵多能互补供暖系统比传统区域锅炉房集中供暖系统节能30.55%;低温热水地板辐射供暖方式与传统明装散热器供暖方式相比,可节能18.96%;新型供暖系统比传统供暖系统具有更好的热舒适性;在实验条件下,太阳能保证率可达24%以上。     

一种新型低温热水地板辐射供暖系统

低温热水地板辐射供热系统具有十分广阔的市场前景，介绍了低温热水地板辐射供暖系统的结构、性能及特点，因其具有节能、不占空间、可自行调节温度、维护运行费用低等优点，将成为供暖领域的一种新的发展趋势。     

低温水地板辐射采暖实例分析

通过实例分析了低温水地板辐射采暖方式与传统对流采暖方式在人体热舒适方面的差异,指出这是一种舒适节能的供暖方式,建议在新建建筑及现有供暖系统改造中大力推广。     

低温地板采暖与散热器采暖效果的对比分析

通过地板，墙面和人体之间的辐射换热计算，分析了地板采暖比暖气片采暖节能的原因，对比了两种采暖方式温度场水平分布和垂直分布的差异，空间气流分布的差异以及两种采暖方式热源热储量的差别。通过实测数据的对比表明地板采暖在多方面优于暖气片采暖方式。     

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.     

地板辐射采暖空间温度场的数值模拟

根据地板采暖的特点，建立数学模型，采用有限差分法，模拟地板辐射采暖中地板温度场的变化关系。通过与实测结果进行比较和调整，可有效地控制供暖温度，取得了满意的结果，为工程设计提供比较准确的方法。     

有限热源影响下VM循环热泵的热力学分析

对于低温余热,VM循环热泵是一种高效节能的利用途径.文中采用有限时间热力学方法,推导了基于牛顿线性导热定律的内可逆VM循环热泵泵热率的表达式.分析表明:采用VM循环热泵用于地板辐射采暖时,随着有限高温热源的入口温度和有限低温热源进口温度的增加,泵热率将增大;而随着有限高温热源的出口温度和有限低温热源出口温度的增加,泵热率将减小.并且低温有限热源温度的变化对泵热率的影响远大于高温有限热源温度的变化.     

Measurement of heat and mass transfer between the lower and upper floors of a house

The work is concerned with measuring heat and mass transfer between the lower and upper floors of a conventional house via a doorway. Air flows between the two floors were measured using a single tracer gas technique, and the temperatures at various points in each floor were measured using thermocouples. The lower floor of the house was heated to various temperatures in the range 18–35 °C using thermostatically controlled heaters. The upper floor was unheated. Two portable SF₆ systems fitted with electron capture detectors were employed for measurement of the interzonal air flow. The mass and heat flow rates between the two floors were calculated from the tracer gas concentrations, and temperature differences and results were compared with the values predicted by the existing algorithms for the two zone enclosures. The mass flow rate and coefficient of discharge for the doorway were found to be functions of the temperature difference between the floors of the house.     

A new apparatus for measuring total hemispherical emittance of surfaces at room temperature

Radiation heat transfer is an important mode of heat transfer even in our life space at room temperature. Such radiation heat transfer is evaluated mostly by calculating the radiation energy exchange among surfaces in an enclosure. For this evaluation, knowledge of the hemispherical emittances of the constituent life surfaces is needed. However, there has not been a suitable technique for measuring the emittance of each surface in the life space at room temperature. In the present work we develop a new apparatus for measuring total hemispherical emittances of real surfaces at room temperature. The apparatus consists of a total radiation flux meter and a Peltier element cooler to cool the flux meter surface from the back, and measure the net total radiation flux from the specimen surface to the surrounding surfaces to determine the total hemispherical emittance of the specimen surface. This apparatus is effective to measure total hemispherical emittances of surfaces at room temperature on site. We apply the developed apparatus to measure the total hemispherical emittances of various surfaces in the life space, such as metals, human skin, cloth, floor mat, wood, glass, brick tile, stone, cement, plant leaves, etc., and demonstrate the feasibility of the apparatus. © 2011 Wiley Periodicals, Inc. Heat Trans Asian Res; Published online in Wiley Online Library ( wileyonlinelibrary.com/journal/htj ). DOI 10.1002/htj.20349     

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。     

Greenhouse floor heating system optimization using long-term thermal performance design curves

Steady-state design curves suitable for the determination of long-term thermal performance of the floor heating system are presented in the paper. The dominant design variables considered in the system synthesis are: pipe diameter and spacing, floor depth, greenhouse main air mass temperature, hot water temperature, water flow rate and plant canopy density. The design curves are generated for a wide range of these parameter values. The nomograms are presented in terms of the greenhouse heat gain per unit floor area as a function of the floor depth, with other variables as parameters. The set of design curves also includes the values of the rate of change of heat flux with the floor depth. This facilitates in design optimization by reducing the three dimensional search in geometric parameter, namely, pipe diameter and spacing, and floor depth, to a two dimensional search. The utility of nomograms is illustrated through a design example for a floor heated greenhouse located in the midwest region of the United States. The optimum parameter values for the floor heating system are estimated using the classical calculus technique.     

Numerical study of radiation‐convection heat transfer

In this study, the authors attempted to introduce a simulation technique for radiation‐convection heat transfer in the high‐temperature fields of industrial furnaces, boilers, and gas turbine combustors. The convection effect was analyzed by a differential equation, but the radiation effect was analyzed by an integral equation. Thus, it was not easy to arrange both effects using the same type of equations. Then, the authors introduced the zone method and Monte Carlo method for the integral equation of the radiation effect and the finite difference method for the differential equation of the convection effect. A three‐dimensional analysis of the high‐temperature furnace was performed by this simulation technique to obtain its temperature distribution. Furthermore, another radiation‐convection heat transfer analysis in the low‐temperature living room was performed by the same technique. Finally, the authors tried to develop a computer software for radiation‐convection heat transfer and described their idea of software construction for the above. © 2002 Wiley Periodicals, Inc. Heat Trans Asian Res, 31(5): 391–407, 2002; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.10042