Abstract

One of the important heating criteria of a greenhouse in the Northern hemisphere countries is heat availability, particularly in the winter season. Among other heat storage types, seasonal soil-based energy storage performance is auspicious. However, the performance is affected by the length and depth of borehole pipes used, which are very expensive for growers. Therefore, this study investigates the performance of a shallow seasonal soil-based energy storage heat pump, in a greenhouse. Thick insulations were installed to reduce soil heat loss. The soil thermal imbalance ratio was calculated to know the thermal recovery resulted. Based on the results, the heat pump’s seasonal coefficient of performance (COP) heating and cooling varied between 1.48–2.97 and 1.20–3.45, respectively. The COPsys heating and cooling were observed to be 1.51 and 1.55, respectively. However, the system successfully maintained indoor temperature >16°C in other seasons, except for winter. Due to low brine input in winter, the average indoor temperature dropped to 11°C, indicating a thermal soil property problem. Moreover, the proposed system achieved soil thermal imbalance ratio of 32.76%.

中文翻译：

---

温室采暖制冷地源热泵系统试验研究

摘要

北半球国家温室的重要供暖标准之一是供暖，尤其是在冬季。在其他储热类型中，基于土壤的季节性储能性能是吉祥的。然而，性能受所用钻孔管的长度和深度的影响，这对种植者来说非常昂贵。因此，本研究调查了浅层季节性土壤储能热泵在温室中的性能。安装了厚绝缘层以减少土壤热损失。计算土壤热失衡率以了解热恢复结果。根据结果​​，热泵的季节性能系数 (COP) 加热和冷却分别在 1.48-2.97 和 1.20-3.45 之间变化。观察到 COPsys 加热和冷却分别为 1.51 和 1.55，分别。然而，该系统在除冬季外的其他季节成功地将室内温度保持在 16°C 以上。由于冬季盐水输入量低，室内平均温度降至 11°C，表明存在热土性状问题。此外，所提出的系统实现了 32.76% 的土壤热失衡率。