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首页> 外文会议>International Symposium on Advanced Technologies and Management Towards Sustainable Greenhouse Ecosystems >Performance of a Covered Closed Loop Shallow Geothermal Greenhouse Heating System
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Performance of a Covered Closed Loop Shallow Geothermal Greenhouse Heating System

机译：覆盖闭环浅层地热温室加热系统的性能

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摘要

A great variety of heating applications are being used nowadays in order to cover the greenhouse thermal needs. During the last decade a significant increase in installation of Shallow Geothermal Heat (SGH) systems assisted by closed loop Geothermal Heat Pumps (GHP) has been observed. The SGH systems are highly efficient, renewable energy systems for greenhouse heating and cooling. The main advantage of these systems consists on the simplicity of the application, the low cost of structure and the fact that no drilling is required. The SGH systems exploit the underground stored heat, even in shallow depths. The external air temperature variations interact directly only with the surface soil temperature, due to the soil heat capacity. As a result, the effect of the external air temperature variations is being reduced at deeper ground layers. The underground temperature value remains almost constant at a depth greater than 5.0 m, while in 2.0 m depth the underground temperature value has been proved that do not change significantly if the ground is under cover. Therefore, a fluid of a more or less constant temperature can be supplied to the primary GHP circuit by installing a ground heat exchanger. GHPs, operating with such a system, consume less energy than air-to-air heat pumps which are widely used. The present study presents a technical analysis concerning the installation and performance of a covered closed loop GHP used in a SGH system for greenhouse, without an auxiliary conventional heating system. The innovation of the examined system relies on the fact that the ground surface, above which the piping installation is under a polyethylene film cover or it is located inside a greenhouse. This system was proved experimentally to improve the heating performance of the GHPs.
机译：现在正在使用各种各样的加热应用，以弥补温室热需求。在过去的十年中，已经观察到通过闭环地热泵（GHP）辅助的浅地形热（SGH）系统安装的显着增加。 SGH系统是温室加热和冷却的高效，可再生能源系统。这些系统的主要优点在于应用程序的简单性，结构的低成本以及不需要钻孔的事实。 SGH系统利用地下储存的热量，即使在浅层深度也是如此。由于土壤热容量，外部空气温度变化仅与表面土温相互作用。结果，外部空气温度变化的效果在更深的研磨层处减小。地下温度值在大于5.0米的深度保持几乎恒定，而在2.0米深度中，已经证明了地下温度值，如果地面处于盖板下，则不会发生显着变化。因此，通过安装接地热交换器，可以将更多或更少恒定温度的流体提供给主GHP电路。 GHPS，使用这种系统操作，比广泛使用的空对空热泵消耗更少的能量。本研究提出了关于用于温室的SGH系统中使用的覆盖闭环GHP的安装和性能的技术分析，而无需辅助传统的加热系统。所检查系统的创新依赖于地面表面，上述管道安装在聚乙烯薄膜盖下或其位于温室内。实验证明该系统以提高GHP的加热性能。

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