A Load-Aggregation Method to Calculate Extraction Temperatures of Borehole Heat Exchangers
A Load-Aggregation Method to Calculate Extraction Temperatures of Borehole Heat Exchangers
复制标题
计算埋管换热器抽气温度的载荷聚合方法
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
S. Javed
中科院分区：
文献类型：
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作者：
J. Claesson;S. Javed
从埋管换热器中提取流体温度的每小时模拟往往非常耗时。提出了一种新的负荷聚合方案，用于对埋管换热器进行长期模拟。起点是所考虑的埋管换热器和相应的长序列单元的阶跃响应函数，每个单元具有负载和加权因子。在第一级，保留原始加权因子。在下面的级别，2，4，8等，加权因子被集中在一起。集总加权因子直接从阶跃响应函数获得。选择要集中在一起的电池的数量，使得使用集中加权因子的提取温度给出非聚集方案的足够好的近似。将新方案应用于测试用例，以模拟20年时间段内的浸提液温度。结果表明，新格式能快速准确地模拟埋管换热器的传热过程。
Hourly simulations of extraction fluid temperatures from borehole heat exchangers tend to be very time consuming. A new load aggregation scheme to perform long-term simulations of borehole heat exchangers is presented. The starting point is the step-response function for the considered borehole heat exchanger and the corresponding long sequence of cells, each with a load and a weighting factor. On the first level, the original weighting factors are kept. On the following levels, 2, 4, 8, etc., the weighting factors are lumped together. The lumped weighting factors are obtained directly from the step-response function. The number of cells to be lumped together is chosen so that the extraction temperatures using lumped weighting factors give a sufficiently good approximation of the non-aggregated scheme. The new scheme is applied to a test case to simulate extraction fluid temperature over a 20-year time period. Comparison of the results from the new scheme with the non-aggregated setting shows that the new scheme can perform very accurate and fast simulations of borehole heat exchangers.