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Residential space heating electrification through a PV-driven hot water heat pump
Energy and Buildings ( IF 6.6 ) Pub Date : 2025-01-19 , DOI: 10.1016/j.enbuild.2025.115319
Zheng Wang, Mark Luther, Peter Horan, Jane Matthews, Chunlu Liu

As the world progresses towards decarbonisation, solutions for houses dependent on fossil fuels are required. Solar photovoltaic (PV) and heat pumps are attractive in reducing carbon emissions due to their renewable energy generation and outstanding energy efficiency. Therefore, this paper investigates the energy, economic and environmental performance of electrifying fossil fuel-based space heating systems through PV-driven hot water heat pumps. A case study was conducted on a typical Australian housewith a 10 kW PV, a hot water heat pump, and a gas-ducted heater. Transient System Simulation (TRNSYS) was employed to simulate the existing space heating and hot water system (ESH): a gas ducted heater + a PV-driven hot water heat pump and the proposed space heating and hot water system (PSH): a heating tank + a heating element + fan coil units + a PV-driven hot water heat pump. The simulated space heating loads, PV generation and heat pump power consumption, were verified using actual measurements. Results demonstrated that PSH eliminated the annual gas demand of 4093 kWh needed for ESH. Additionally, the annual PV self-consumption and self-sufficiency increased by 26 % and 50 %, respectively, from the previous levels of 19 % and 29 % due to the electrification of the space heating system. After determining the optimal sizing of the heating tank and its immersed heating element based on the high PV energy utilization rule, it was discovered that a payback period of 12.3 years was required for transitioning the house from ESH to PSH with an annual carbon emission reduction of 24 %. This work demonstrated the feasibility of electrifying the conventional fossil fuel-based space heating system to fan coil units and a heating tank connected to a PV-driven hot water heat pump, thus contributing to the decarbonization of future homes.

中文翻译:


通过光伏驱动的热水热泵实现住宅空间供暖电气化



随着世界朝着脱碳方向发展,需要为依赖化石燃料的房屋提供解决方案。太阳能光伏 (PV) 和热泵因其可再生能源发电和出色的能源效率而在减少碳排放方面具有吸引力。因此,本文研究了通过光伏驱动的热水热泵实现基于化石燃料的空间供暖系统电气化的能源、经济和环境性能。对一个典型的澳大利亚房屋进行了案例研究,该房屋拥有 10 kW PV、热水热泵和燃气管道加热器。瞬态系统仿真 (TRNSYS) 用于模拟现有的空间供暖和热水系统 (ESH):燃气管道加热器 + 光伏驱动的热水热泵和拟议的空间供暖和热水系统 (PSH):加热箱 + 加热元件 + 风机盘管机组 + 光伏驱动的热水热泵。模拟的空间供暖负荷、光伏发电量和热泵功耗通过实际测量进行了验证。结果表明,PSH 消除了 ESH 所需的 4093 kWh 的年天然气需求。此外,由于空间供暖系统的电气化,年度光伏自用和自给自足分别从之前的 19% 和 29% 的水平增长了 26% 和 50%。在根据光伏高能利用率规则确定加热罐及其浸没式加热元件的最佳尺寸后,发现将房屋从 ESH 过渡到 PSH 需要 12.3 年的投资回收期,每年减少 24% 的碳排放量。 这项工作证明了将传统的基于化石燃料的空间供暖系统电气化为风扇盘管装置和连接到光伏驱动热水热泵的加热罐的可行性,从而为未来住宅的脱碳做出贡献。
更新日期:2025-01-19
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