Importance of Groundwater Flow on Life Cycle Costs of a Household Ground Heat Pump System in Japan
Importance of Groundwater Flow on Life Cycle Costs of a Household Ground Heat Pump System in Japan
复制标题
地下水流量对日本家用地源热泵系统生命周期成本的重要性
DOI：
10.11322/tjsrae.18-45ac_oa
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
K. Nagano
中科院分区：
文献类型：
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作者：
Yoshitaka Sakata;T. Katsura;K. Nagano
本文分析了日本住宅中使用的地源热泵系统的生命周期成本，考虑了八种不同达西速度的地下水流的平流效应。通过热泵模拟，在不同加热/冷却负荷的每七个区域中确定单个埋管换热器所需的长度，以最大限度地降低 20 年内的生命周期成本。研究表明，地下水流的影响在流速大于10 m/y时出现，当流速达到200 m/y时基本收敛。成本根据速度的对数几乎呈线性下降。该速度范围在日本的陡峭山谷和冲积扇中是可能的。这项研究还表明，成本主要与总负荷有关，其次与家庭系统的地下水流条件有关。在七个地区中，在寒冷地区1和2中，户用系统相对于传统空气源热泵系统在经济上是合适的，而无需降低初始成本。当初始成本降低 20% 作为当前研发项目的共同目标时，中温暖地区 3 至 5 也变得合适。
This paper analyzed life cycle costs of a ground source heat pump system used in a residence of Japan considering an advection effect of groundwater flow of eight different Darcy velocity. The required length of a single borehole heat exchanger was determined in each seven area of different heating/cooling loads to minimize the life cycle cost during 20 years through heat pump simulations. This study revealed that the effect of groundwater flow appeared when the velocity was more than 10 m/y and was almost converged when the velocity reached at 200 m/y. The cost decreased almost linearly according to the logarithms of the velocity. The velocity range was possible in steep valleys and alluvial fans of Japan. This study also showed that the costs were related mainly to the total loads, and secondarily to the groundwater flow conditions for the household system. Among seven areas, the household system was economically suitable relative to conventional air source heat pump systems in the cold areas 1 and 2 without initial cost reduction. The moderately warm areas 3 to 5 also became suitable when the initial costs would be reduced by 20 % as a common target of current R&D projects.
家用空调COP现状及APF区域特征研究
DOI：
--
发表时间：
2014
期刊：
日本建築学会技術報告集
影响因子：
--
作者：
赤林 伸一;坂口 淳;大嶋 拓也;市川 裕幸;有波 裕貴
通讯作者：
有波 裕貴