Techno-economic assessment of cascade air-to-water heat pump retrofitted into residential buildings using experimentally validated simulations
Techno-economic assessment of cascade air-to-water heat pump retrofitted into residential buildings using experimentally validated simulations
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DOI：
10.1016/j.apenergy.2019.05.041
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发表时间：
2019-09
期刊：
影响因子：
11.2
通讯作者：
K. Le;M. Huang;N. Shah;Christopher Wilson;Paul Mac Artain;R. Byrne;N. Hewitt
中科院分区：
文献类型：
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作者：
K. Le;M. Huang;N. Shah;Christopher Wilson;Paul Mac Artain;R. Byrne;N. Hewitt
复叠式空气能热泵在低环境温度下运行进行高温供水时，比单级空气能热泵具有更好的综合效率。虽然文献中的许多研究调查了复叠热泵设备性能的具体特征，但很少有关于使用经过实验验证的动态建筑模拟对这些热泵在住宅建筑中的改造应用的信息。在本研究中，通过经过实验验证的 TRNSYS 模拟对住宅建筑中改装的可变容量级联空气-水热泵进行技术经济评估。进一步研究了复叠热泵与蓄热耦合在不同场景下的运行情况。获得了实验室和现场试验结果，以开发和验证与动态建筑模拟模型集成的复叠热泵模型。对于无蓄能的热泵系统，即使热泵采用了天气补偿控制，在环境温度为− 11.2°C 至 29.5°C 时，预测的年 COP 几乎低于 2.5。模拟结果还表明，复叠热泵在运行成本方面无法击败燃气锅炉和高效燃油锅炉（90％），但可以减少CO 2 （从14％到57％）。对于热泵与蓄能耦合，模拟结果表明，在环境温度为− 5.6°C 至 23.8°C 之间时，热泵与蓄能连续耦合的年性能最低（实际 COP 为 1.41），而直接加热获得最高效率（实际 COP 为 2.12），其次是负荷转移（实际 COP 为 1.88）。
Cascade air-to-water heat pumps have better overall efficiency than single-stage air-to-water heat pumps when operating at low ambient temperatures for high temperature water supply. While many studies in the literature investigated the specific features of equipment performance of cascade heat pumps, there is little information about retrofit applications of these heat pumps in residential buildings using experimentally validated dynamic building simulations. In this study, the techno-economic assessment of a variable capacity cascade air-to-water heat pump retrofitted into residential buildings is conducted by means of experimentally validated TRNSYS simulations. The cascade heat pump coupled with thermal energy storage operating in different scenarios is further studied. Laboratory and field trial results were obtained to develop and validate a cascade heat pump model integrated with a dynamic building simulation model. Regarding the heat pump system without storage, the predicted annual COPs were almost below 2.5 at ambient temperatures of from− 11.2° C to 29.5° C, even the heat pump adopted weather compensation control. Simulation results also indicated that the cascade heat pump could not defeat gas boilers and high-efficiency oil boilers (90%) in terms of operating costs, but there were CO 2 reductions (from 14% to 57%). As for the heat pump coupled with storage, simulation results showed that at ambient temperatures of between− 5.6° C and 23.8° C, the continuous coupling between the heat pump and the storage revealed the lowest annual performance (actual COP of 1.41), while the direct heating obtained the highest efficiency (actual COP of 2.12) followed by the load-shifting (actual COP of 1.88).