| Autor: |
Greene, M., Lohan, J., Burke, N., Dimache, L., Clarke, R. |
| Předmět: |
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| Zdroj: |
Proceedings of the Renewable Energy Conference; Jun2010, p85-96, 12p |
| Abstrakt: |
As part of the HP-IRL study a horizontal ground heat exchanger in winter mode was simulated using the finite difference method in Cartesian coordinates. The authors have found that while a finite difference liquid energy balance simulation of the heat exchanger is accurate; fully transient and mimics real life, it is best suited for simulation of shorter system on-times of hours or days, as it becomes cumbersome to simulate every meter of the heat exchange fluid along with ground temperature distribution over long system on-times of months. This paper demonstrates a simulation based on estimating the heat exchanger's local heat flux at the exit of the pipe in order to determine the fluid's return temperature. For a 150m pipe this makes the calculation domain 150 times smaller than the liquid energy balance domain meaning the method is more efficient to use when a ground source heat pump system is to be simulated over long time periods such as months. It works best when the heat pump system is running in an approximate steady state condition, meaning turned on for all or a part of each day. Validation shows that the maximum error in hour average return temperature prediction is 1°C. This method along with the more common liquid energy balance method, both in Cartesian coordinates, are currently in use as part the HP-IRL study to simulate new heat exchanger designs in order to optimize system efficiency in Ireland's maritime climate. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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