Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6732336 | Energy and Buildings | 2015 | 8 Pages |
Abstract
Thermal performance of earth air tunnel heat exchanger has been investigated under transient conditions for three different soil conditions considering three operating modes. In first operating mode EATHE works continuously for 12Â h, in second mode it works for 60Â min and then it is off for 20Â min and in the last mode EATHE runs for 60Â min and remains off for 40Â min. In second and third mode EATHE is operated for 12Â h intermittently. CFD model was developed in GAMBIT (version 2.2.3), simulated in FLUENT (version 6.3) and then validated with experimental data. CFD analysis has been carried out using a three-dimensional transient numerical model. Air temperature drop and heat transfer between air and soil is calculated considering different thermal properties of soils. Higher thermal conductivity (1.28Â WÂ mâ1Â Kâ1) soil should be used in first mode of 12Â h continuous operation as it improves the performance by 5.04% as compared to least thermal conductivity soil and soil with poor thermal conductivity (0.52Â WÂ mâ1Â Kâ1) shows performance improvement of 1.81% when operated in intermittent operation as compared to continuous running.
Related Topics
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Authors
Anuj Mathur, Ayushman Srivastava, G.D. Agrawal, Sanjay Mathur, Jyotirmay Mathur,