Exergy analysis of a two-stage ground source heat pump with a vertical bore for residential space conditioning under simulated occupancy
Exergy analysis of a two-stage ground source heat pump with a vertical bore for residential space conditioning under simulated occupancy
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DOI：
10.1016/j.apenergy.2015.06.004
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发表时间：
2015-10
期刊：
影响因子：
11.2
通讯作者：
M. Ally;J. Munk;V. Baxter;A. Gehl
中科院分区：
文献类型：
--
作者：
M. Ally;J. Munk;V. Baxter;A. Gehl
这项为期12个月的实地研究分析了7.56 W（2.16吨）的水-空气-地源热泵（WA-GSHP）的性能，以满足美国混合潮湿气候中253 m2房屋的家用空间空调负荷。利用土地作为可再生能源的实际可行性得到了明确的证明。超过75%的空间供暖所需的能量来自地面。在夏季和冬季恒温器设定点分别为24.4 ℃和21.7 ℃时，空间空调的平均每月耗电量仅为40千瓦/小时。WA-GSHP与单独的水-水地源热泵（WW-GSHP）共享相同的94.5 m垂直钻孔地面环路，以满足同一房屋的生活热水需求。系统不可逆性是造成系统损失功的主要原因，通过分析系统不可逆性的（火用）和（能量），确定系统不可逆性的（火用）和（能量）损失的来源，对进一步的系统改进至关重要。研究结果表明，WA-GSHPs是一种切实可行的技术，可减少IECC 2012标准下的一次能源消耗和温室气体排放，以及欧盟（EU）2020年使用可再生能源的目标。
This twelve-month field study analyzes the performance of a 7.56 W (2.16-ton) water-to-air-ground source heat pump (WA-GSHP) to satisfy domestic space conditioning loads in a 253 m2house in a mixed-humid climate in the United States. The practical feasibility of using the ground as a source of renewable energy is clearly demonstrated. Better than 75% of the energy needed for space heating was extracted from the ground. The average monthly electricity consumption for space conditioning was only 40 kW h at summer and winter thermostat set points of 24.4 °C and 21.7 °C, respectively. The WA-GSHP shared the same 94.5 m vertical bore ground loop with a separate water-to-water ground-source heat pump (WW-GSHP) for meeting domestic hot water needs in the same house. Sources of systemic irreversibility, the main cause of lost work, are identified using Exergy and energy analysis.Quantifying the sources of Exergy and energy losses is essential for further systemic improvements. The research findings suggest that the WA-GSHPs are a practical and viable technology to reduce primary energy consumption and greenhouse gas emissions under the IECC 2012 Standard, as well as the European Union (EU) 2020 targets of using renewable energy resources.