Loading...
Please wait, while we are loading the content...
Similar Documents
Effects of the Circuit Arrangement on the Thermal Performance of Double U-Tube Ground Heat Exchangers
| Content Provider | MDPI |
|---|---|
| Author | Jahanbin, Aminhossein Semprini, Giovanni Impiombato, Andrea Natale Biserni, Cesare Schio, Eugenia Rossi Di |
| Copyright Year | 2020 |
| Description | Given that the issue of variations in geometrical parameters of the borehole heat exchanger (BHE) revolves around the phenomenon of thermal resistance, a thorough understanding of these parameters is beneficial in enhancing thermal performance of BHEs. The present study seeks to identify relative changes in the thermal performance of double U-tube BHEs triggered by alterations in circuit arrangements, as well as the shank spacing and the borehole length. The thermal performance of double U-tube BHEs with different configurations is comprehensively analyzed through a 3D transient numerical code developed by means of the finite element method. The sensitivity of each circuit configuration in terms of the thermal performance to variations of the borehole length and shank spacing is investigated. The impact of the thermal interference between flowing legs, namely thermal short-circuiting, on parameters affecting the borehole thermal resistance is addressed. Furthermore, the energy exchange characteristics for different circuit configurations are quantified by introducing the thermal effectiveness coefficient. The results indicate that the borehole length is more influential than shank spacing in increasing the discrepancy between thermal performances of different circuit configurations. It is shown that deviation of the averaged-over-the-depth mean fluid temperature from the arithmetic mean of the inlet and outlet temperatures is more critical for lower shank spacings and higher borehole lengths. |
| Starting Page | 3275 |
| e-ISSN | 19961073 |
| DOI | 10.3390/en13123275 |
| Journal | Energies |
| Issue Number | 12 |
| Volume Number | 13 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2020-06-24 |
| Access Restriction | Open |
| Subject Keyword | Energies Geothermal Energy Ground-source Heat Pumps Borehole Heat Exchangers Ground Heat Exchangers Double U-tube Circuit Arrangement Thermal Performance Thermal Resistance Shank Spacing |
| Content Type | Text |
| Resource Type | Article |
