辽沈Ⅳ型日光温室墙体保温性能试验研究

通过对辽沈Ⅳ型（大跨度）日光温室的北墙相同垂直面不同高度处的实验研究,得出温室的墙体表面温度与室内外温度的关系和热流量及墙体表面蓄放热的变化规律.实验研究表明,温室所采用的墙体具有良好的保温隔热性能.     

双向单坡日光温室温度环境试验研究

双向单坡日光温室的结构特点是南、北两栋温室共用一面后墙,由于这样的结构特点,使得温室的后墙不再裸露在外部空气中,减少了南面温室后墙的热量散失,从而提高了温室的室内气温。     

下沉式日光温室土质墙体的保温蓄热性能

为研究土质墙体下沉式日光温室的保温蓄热性能,对墙体温度及热流的变化进行了实验测试.测试结果表明:白天土质墙体接受太阳辐射并蓄热;夜间墙体内侧表面温度高于室内温度,墙体向室内放热.土质墙体具有良好的保温蓄热性能,可以满足作物生长的需要,.     

日光温室节能墙体的选择

为探讨日光温室墙体对室内热环境的影响，对两组温室室内外温度进行了测试对比，并针对目前常见的单一材料墙体及异质复合墙体，在厚度相同的情况下进行了传热分析。测试结果显示，异质复合墙体温室内的夜间温度比单一材料墙体温室夜间温度高3℃左右。在考虑墙体的蓄热和传热情况下，温室墙体以内部砖外部聚苯板异质复合墙体为宜。     

燃池在日光温室应用的试验研究

燃池加温是一种利用生物质能的新型加温方法。燃池燃烧是一种阴燃过程,不需任何助燃措施,即可放出热量,提高温室的地温和气温,加热均匀,持续稳定。在不同日光温室中进行的对比试验表明,利用燃池可以显著提高温室的地温和气温,室内外平均温差达到30℃以上。     

东北型节能日光温室--辽沈Ⅰ型日光温室节能设计试验研究

辽沈Ⅰ型日光温室是“九五”国家重大科技产业工程-工厂化高效农业示范工程在全国招标的十三个专题之一-“东北型节能日光温室结构及调控设施的优化设计实验”的研究成果，在采光性能，保温性能取得了突破性进展，真正达到了高效节能。     

辽沈I型日光温室内热平衡的建立及数值模拟

利用稳态传热理论,通过已有的辽沈Ⅰ型日光温室的热阻资料建立热量平衡方程,对室内气温进行数值模拟,并与观测值进行对比分析,验证模型的可靠性.为辽沈Ⅰ型日光温室的室内温度预测提供依据.     

辽沈Ⅰ型日光温室内热平衡的建立及数值模拟

利用稳态传热理论,通过已有的辽沈Ⅰ型日光温室的热阻资料建立热量平衡方程,对室内气温进行数值模拟,并与观测值进行对比分析,验证模型的可靠性。为辽沈Ⅰ型日光温室的室内温度预测提供依据。     

基于ANSYS的日光温室复合相变保温墙体的模拟研究

复合相变保温砂浆可作为内保温砂浆与日光温室墙体组成复合相变保温墙体,为温室生产提供热能。通过对日光温室相变墙体相变传热过程的数值模拟研究,可较好地掌握其蓄放热特性,为日光温室应用复合相变材料提供理论支持。该文利用ANSYS有限元分析软件模拟研究日光温室复合相变保温墙体的传热过程,数值模拟结果表明:50 mm复合相变保温砂浆与490 mm砖墙组成的复合相变保温墙体和30 mm复合相变保温砂浆与240 mm加气混凝土砌块墙组成的复合相变保温墙体都具有较强的蓄放热能力,两者的持续蓄热时间均为8 h,持续放热时间分别为16和13 h,这2种复合相变保温墙体均适合于冬季温室生产。     

东北型日光温室太阳能辅助加温系统试验研究

针对利用传统能源为温室地温加热耗能量大、将造成环境污染等现状,对太阳能辅助加热系统进行试验和理论探讨,通过利用太阳能集热器加热水并在地下散热水管中循环散热直接对温室内土壤进行加热,从而作为一种辅助加温措施以达到降低农业耗能量的目的.结果表明,当散热管埋深400 mm时地温最高,较其他散热管埋深及地下埋设有机酿热物更利于植物根系生长,且地温值变化稳定,效果更佳.     

东北型节能日光温室--辽沈Ⅰ型温室地下热交换系统试验研究

温室的地下热交换系统是为提高太阳能的利用率，达到节能增温的目的而研究设置的，本文运用传热学的基本理论，通过对日光温室地下热交换系统土壤温度场的分析。提出了日光温室地下热交换系统的设计原理，地下热交换系统的设计的一般方法，并结合测试结果进行分析。     

Experimental determination of the overall heat loss coefficient for energy requirement of greenhouse heating

This paper presents an experimental determination of energy requirement for greenhouse heating. The overall heat loss coefficient, heat input, the control factor for air‐tightness, the rate of heat loss and the thermal screen effectiveness were calculated. The relationships between the overall heat loss coefficient and the wind speed, and the outside temperature were modelled, including the measured and calculated values. It was found that the thermal screen effectiveness was 16 and 19.8% for the polyethylene (PE) and polyester screens, respectively. Copyright © 2005 John Wiley & Sons, Ltd.     

纳米颗粒对盐梯度太阳池热性能影响的实验研究

为了增强太阳池的储热温度以及热效率,采用了在太阳池下对流层添加纳米颗粒的方法.通过光照实验与沉降实验选取质量分数为0.010％的碳纳米管溶液添加到太阳池的下对流层,然后与普通盐梯度太阳池进行对比实验,并对实验数据进行分析、计算.实验结果表明:在相同模拟光源下,含纳米颗粒小型太阳池的下对流层平均温度提高了 1.7℃,效率...     

A review on thermal energy storage systems in solar air heaters

The drying needs of agricultural, industrial process heat requirements and for space heating, solar energy is one of the prime sources which is renewable and pollution free. As the solar energy is inconsistent and nature dependent, more often there is a mismatch between the solar thermal energy availability and requirement. This drawback could be addressed to an extent with the help of thermal energy storage systems combined with solar air heaters. This review article focuses on solar air heaters with integrated and separate thermal energy storage systems as well as greenhouses with thermal storage units. A comprehensive study was carried out in solar thermal storage units consisting of sensible heat storage materials and latent heat storage materials. As the phase change heat storage materials offer many advantages over the sensible heat storage materials, the researchers are more interested in this system. The charging and discharging characteristics of thermal storage materials with various operational parameters have been reported. All the possible solar air heater applications with storage units have also been discussed.     

太阳能冷暖箱的研制

介绍了一种用太阳电池供电的半导体致冷、致热双用保温箱,具有结构紧凑轻巧、无噪音、无污染和寿命长等特点。叙述了该冷暖箱的工作原理、系统设计、半导体致冷器件以及太阳能电源控制器的研制。     

Effect of phase change material on passive thermal heating of a greenhouse

In this study, a periodic analysis of a greenhouse with combination of phase change material (PCM) and insulation as a north wall has been developed for thermal heating. The thermal model is based on Fourier analysis. Effect of distribution of PCM thickness on plant and room air temperature has been studied in detail. The plant and room air temperature have been evaluated with and without north wall. Numerical computations have been carried out for a typical winter day of New Delhi. On the basis of numerical results, it is inferred that (i) there is a significant effect of PCM north wall and heat capacity of plant temperature during off‐sunshine hour due to storage effect and (ii) the rate of heat flux inside greenhouse from north wall is maximum for least thickness of PCM. Copyright © 2005 John Wiley & Sons, Ltd.     

Short-term thermal performance of a built-in solar storage for frost prevention in a greenhouse

Built-in solar storage is an alternative to the traditional solar collectors. This paper explores the possibility of utilizing such solar stores for frost prevention in greenhouses. In the study, two identical NE–SW orientated greenhouses with 50 m² ground area were erected. The total ground area and volume of the water stores used in the solar greenhouse were about 6·4 and 5·4% of the total ground area and volume of the greenhouse. The short-term results showed that at times when the air temperature in the control greenhouse dropped below 0°C, it was about 3·5°C in the solar greenhouse, and sometimes this difference was more than 4·5°C. The average fraction of solar energy storage by the stores was 0·26 for a four day period. © 1998 John Wiley & Sons, Ltd.