| 摘要 |
<p>The method extracts heat from the ground in a greenhouse heated by buried pipes through which a warm medium flows. Air is drawn in from inside the greenhouse (2) and caused to circulate through drains (8) running near the buried pipes (6), before returning to the interior of the greenhouse again. The drains can be run parallel or at right angles to the buried pipes, each having a fan (10) giving forced air circulation through it. Two valves can be provided, allowing air to be drawn in from the inside or outside of the greenhouse.</p> |
