TEST OF A PILOT INSTALLATION OF A SOIL REGENERATOR FOR GREENHOUSES

Thermophysics and Thermal Power Engineering Pub Date : 2021-10-08 DOI:10.31472/ttpe.3.2021.11

I. Boshkova, N. Volgusheva, I. Mukminov, E. Altman

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Abstract

The relevance of the development of ground regenerative heat exchangers is determined by the need to save energy resources for heating greenhouses at night and maintaining the required temperature level during the day. The aim of the work is to study working capacity of a ground regenerator for a greenhouse when testing a pilot plant in full-scale conditions. To achieve this goal the following main tasks were solved: experimental research of soil regenerator pilot plant operation was carried out, the heating period of nozzle and cooling period were determined by the obtained temperature curves, the coefficient of intercomponent heat exchange during the heating period was estimated, the rationality of material choice for granulated nozzle was proved, recommendations on improvement of soil regenerator design for industrial use were developed. The research was conducted on a pilot installation of a soil regenerator, which consists of a heat-exchange duct filled with granulated material and covered with a layer of insulation, and ducts with an exhaust duct fan installed at the outlet. Data on air and nozzle temperatures, which were taken during the day, were used to conduct thermal calculations and assess the efficiency of the ground regenerator. It was determined that the heating period at the selected loading mass of 15.5 kg is not long relative to the duration of the experiment and was 166 min. To increase the amount of accumulated heat it is recommended to increase the weight of the nozzle and air flow rate. It was determined that the coefficient of inter-component heat transfer during the heating period varied between 4 W/m2K and 9 W/m2K. In this case, the Bio number is in the range of 0.05 - 0.10, which allows us to conclude that the use of crushed stone as a nozzle material is rational. It is recommended to increase the thickness of insulation to 4.3 cm so that the heat loss from the heat exchange section does not exceed 5%, and to provide the installation of insulated plugs at the ends of the heat exchange section, closing after the end of the heating period.

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温室土壤再生器试验装置试验

地面蓄热式热交换器发展的相关性是由节约能源的需要决定的，以便在夜间加热温室，并在白天保持所需的温度水平。这项工作的目的是研究温室地面再生器的工作能力，同时在全尺寸条件下测试一个试点工厂。为实现这一目标，解决了以下主要任务:开展土壤再生器中试装置运行试验研究，根据所得温度曲线确定喷嘴加热周期和冷却周期，估算加热周期的组分间换热系数，验证颗粒状喷嘴材料选择的合理性，提出改进工业用土壤再生器设计的建议。该研究是在土壤再生器的试验装置上进行的，该装置由一个充满颗粒状材料并覆盖一层隔热层的热交换管和在出口安装排气管道风扇的管道组成。白天采集的空气和喷嘴温度数据被用来进行热计算和评估地面蓄热器的效率。结果表明，在15.5 kg的加载质量下，加热时间相对于实验时间来说并不长，为166 min。为了增加累积的热量，建议增加喷嘴的重量和空气流量。结果表明，加热期间的组分间换热系数在4 W/m2K ~ 9 W/m2K之间。在这种情况下，Bio值在0.05 - 0.10的范围内，这可以让我们得出结论，使用碎石作为喷嘴材料是合理的。建议将保温厚度增加到4.3 cm，使换热段的热损失不超过5%，并在换热段两端安装保温插头，在采暖期结束后关闭。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Thermophysics and Thermal Power Engineering

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