Renewable energy as an auxiliary to heat pumps: Performance evaluation of hybrid solar-geothermal-systems

Q1 Chemical Engineering International Journal of Thermofluids Pub Date : 2024-10-20 DOI:10.1016/j.ijft.2024.100922
Rabih Murr , Jalal Faraj , Hicham El Hage , Mahmoud Khaled
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Abstract

The aim of this study is to combine renewable energy sources with heat pumps so that the usage of electricity needed to operate heat pumps is minimized along with associated fuel combustion. The aforementioned objective leads to reduce the energy consumption, the operational cost and the environmental impact of the heat pump. To minimize the usage of electricity, it is proposed that the heat pump (HP) system is combined by two renewable energy systems, a Solar Air Heater (SAH) and a Geothermal Well Water (G). To enrich this study, five prospective combinations of Heat Pump (HP), Solar Air Heater (SAH) placed Upstream (U) and Downstream (D) of the condenser, and Geothermal Water Well (G) were investigated. Hereafter, these five combinations are referred as HP-G, HP-S-U, HP-S-D, HP-G-S-U and HP-G-S-D. The thermal modeling of the aforementioned combinations in addition to baseline HP were developed and examined using an in-house computational code. To ensure that the input data used in the computational code are reliable, experiments were conducted to validate that the geothermal water temperature is higher than the ambient temperature in winter, in addition to confirming the analytical thermal modeling of the solar air heater. Numerical analyses and associated parametric studies revealed that the combination of Solar Air Heater (SAH) and a Geothermal Well Water (G) can efficiently increase the performance of the system by reducing the power needed to operate the compressor of HP. The gain in COP was found to be 48, 43, 81, 105 and 191 % for HP-G, HP-S-U, HP-S-D, HP-G-S-U and HP-G-S-D respectively. In addition, results revealed that the most efficient system is the (HP-G-S-D) for all simulated conditions and assumptions with a gain in COP that can reach up to 191 % in comparison to the baseline heat pump system.
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可再生能源作为热泵的辅助能源:太阳能-地热混合系统的性能评估
这项研究的目的是将可再生能源与热泵结合起来,从而最大限度地减少热泵运行所需的电力和相关燃料的燃烧。上述目标可降低热泵的能耗、运行成本和对环境的影响。为了最大限度地减少用电量,建议将热泵(HP)系统与太阳能空气加热器(SAH)和地热井水(G)这两个可再生能源系统结合起来。为了丰富这项研究,研究了热泵(HP)、置于冷凝器上游(U)和下游(D)的太阳能空气加热器(SAH)以及地热水井(G)的五种组合。以下将这五种组合称为 HP-G、HP-S-U、HP-S-D、HP-G-S-U 和 HP-G-S-D。除基准 HP 外,上述组合的热建模均采用内部计算代码进行开发和检验。为确保计算代码中使用的输入数据可靠,除了确认太阳能空气加热器的分析热建模外,还进行了实验,以验证冬季地热水温度高于环境温度。数值分析和相关参数研究表明,太阳能空气加热器(SAH)和地热井水(G)的组合可以通过降低运行 HP 压缩机所需的功率来有效提高系统性能。研究发现,HP-G、HP-S-U、HP-S-D、HP-G-S-U 和 HP-G-S-D 的 COP 增益分别为 48%、43%、81%、105% 和 191%。此外,结果显示,在所有模拟条件和假设下,效率最高的系统是(HP-G-S-D),与基准热泵系统相比,其 COP 增益可达 191%。
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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来源期刊
International Journal of Thermofluids
International Journal of Thermofluids Engineering-Mechanical Engineering
CiteScore
10.10
自引率
0.00%
发文量
111
审稿时长
66 days
期刊最新文献
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