Thermally activated building systems (TABSs) offer promising potential for enhancing energy efficiency and indoor thermal comfort in the building sector. The existing studies related to TABSs are mainly limited to simulations and lab-based experiments and studies on experimental tests in real buildings with integrated TABS and ground source heat pump systems are limited. This paper presents an experimental investigation and performance evaluation of a thermally activated building system integrated with a ground source heat pump (TABS-GSHP) system implemented in a net-zero energy office building. A matrix of experiments in the heating mode was designed and analyzed using the Taguchi method to find the optimal operating conditions to improve the operating efficiency of the TABS-GSHP system. A dynamic thermal resistance–capacitance (RC) network model for the floor TABS was also developed to explore additional conditions to overcome experimental limitations. The experimental results showed that the TABS-GSHP system studied can achieve a COP of 5.73 based on the optimal settings for the ground loop differential pressure set-point, slab loop differential pressure set-point, and slab supply water temperature set-point, determined through Taguchi method analysis. The validation of the 5R3C model using the experimental data demonstrated good accuracy in predicting indoor air temperature under two different slab loop differential pressures of 100 kPa and 70 kPa with the maximum relative error of 0.97 % and 1.48 %, respectively. A total of 24 simulation cases based on two different differential pressures in the TABS loop, which were developed considering different operating schedules and slab supply water temperatures, were further used to investigate the indoor thermal performance. On three consecutive winter days, the TABS maintained an indoor air temperature at 20 °C or above for 83.78 % of the occupied period when the supply water temperature was 38 °C and the system was operated from midnight to 5 pm with the slab loop differential pressure of 100 kPa. The results can be used to facilitate the development of optimal control strategies for TABS-GSHP systems to achieve energy efficient operation.

中文翻译：

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与地源热泵系统集成的热激活建筑系统的实验和建模研究


热激活建筑系统 （TABS） 为提高建筑领域的能源效率和室内热舒适度提供了广阔的潜力。现有的与 TABS 相关的研究主要局限于模拟和基于实验室的实验，而对集成 TABS 和地源热泵系统的真实建筑物中的实验测试研究有限。本文介绍了与净零能耗办公楼中实施的地源热泵 （TABS-GSHP） 系统集成的热激活建筑系统的实验调查和性能评估。设计了加热模式下的实验矩阵，并使用田口方法进行分析，以找到提高 TABS-GSHP 系统运行效率的最佳运行条件。还开发了地板 TABS 的动态热阻-电容 （RC） 网络模型，以探索克服实验限制的其他条件。实验结果表明，根据田口法分析确定的接地回路差压设定点、板回路差压设定点和板坯给水温度设定点的最优设置，所研究的 TABS-GSHP 系统可以达到 5.73 的 COP。利用实验数据对 5R3C 模型进行验证，表明在 100 kPa 和 70 kPa 两种不同板回路差压下预测室内空气温度的准确性较高，最大相对误差分别为 0.97 % 和 1.48 %。 总共使用了 24 个基于 TABS 回路中两种不同压差的仿真案例，这些案例是考虑到不同的运行时间表和板式供水温度开发的，进一步用于研究室内热性能。在连续三个冬季日子里，当供水温度为 38 °C 时，TABS 在83.78% 的占用时间内保持室内空气温度在 20 °C 或以上，系统从午夜到下午 5 点运行，板式回路压差为 100 kPa。结果可用于促进 TABS-GSHP 系统的最佳控制策略的开发，以实现节能运行。