Dynamic performance of ground-source heat pumps fitted with frequency inverters for part-load control
Dynamic performance of ground-source heat pumps fitted with frequency inverters for part-load control
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DOI：
10.1016/j.apenergy.2010.04.029
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发表时间：
2010-11
期刊：
影响因子：
11.2
通讯作者：
C. K. Lee
中科院分区：
文献类型：
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作者：
C. K. Lee
建立了带变速压缩机的地源热泵模型。为了提高系统的部分负载性能，采用变频器对地源热泵容量进行调制。基于香港、昆明和北京的天气情况，利用TRNSYS对一个办公室进行了全年动态模拟。对部分负荷控制的不同控制方案进行了试验，并对结果进行了比较。结果表明，在制冷和制热工况下，采用部分负荷变速控制的地源热泵运行效果较好。尽管不可避免地会导致井内流体循环泵能耗的轻微增加，但压缩机的能量输入至少可以减少27%。井田流体的峰值温度也降低了，这使得井眼长度缩短了至少4%，初始成本也相应降低。经济分析表明，随着井眼长度的缩短，投资回收期不超过0.4个月。这突出了在地源热泵系统中采用变速部分负载的优点，因为除了在各种气候条件下的运行成本外，还可以节省初始成本。
A model for a ground-source heat pump (GSHP) fitted with a variable-speed compressor was developed. A frequency inverter (FI) was used to modulate the GSHP capacity for improving the part-load performance of the system. Year-round dynamic simulations were made using TRNSYS for a general office based on the weather conditions in Hong Kong (HK), Kunming (KM) and Beijing (BJ). Different control schemes for the part-load control were tried and the results compared. It was found that the adoption of a variable-speed part-load control to the GSHP in both the cooling and heating mode operations was better. A reduction in the compressor energy input by minimum 27% could be achieved although a slight increase in the borefield fluid circulating pump energy consumption was inevitable. The peak borefield fluid temperatures were also reduced which allowed the borehole lengths to be shortened by at least 4% and the initial cost lowered accordingly. An economic analysis indicated that with the reduced borehole lengths, the payback periods were no longer than 0.4months. This highlighted the merit of employing a variable-speed part-load in a GSHP system as the initial cost might also be saved besides the running costs under a wide range of climatic conditions.