borehole thermal energy storage_ dlsc

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Borehole Thermal Energy Storage (BTES)

144 150mm dia x 35m deep boreholes spaced 2.25m on centre.Single 25mm PEX U-tube with 40mm grout tube.High solids grout 9% Blast Furnace Cement, 9% Portland cement,32% fine silica sand, 50% water24 strings of 6 boreholes in series.

Divided into four circuits and distributed through four quadrants sothat the loss of any s ingle string or circuit has minimal impact on theheat capacity on the entire systemAll circuits and strings s tart from centre of the BTES and move towardthe outside to maximize stratification.

A borehole thermal energy storage (BTES) system is an underground structurefor storing large quantities of solar heat collected in summer for use later inwinter. It is basically a large, underground heat exchanger.

A BTES consists of an array of boreholes resembling standard drilled wells.After drilling, a plastic pipe with a U bend at the bottom is inserted down theborehole. To provide good thermal contact with the surrounding soil, theborehole is then filled with a high thermal conductivity grouting material.

Aerial view of Borehole Thermal Energy Storage (BTES)
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Sideview of single Borehole ThermalEnergy Storage (BTES) tube

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The BTES in the Drake Landing SolarCommunity (DLSC) consists of144 boreholes, each stretching to adepth of 37 meters and planned in agrid with 2.25 meters between them.The BTES field covers 35 metres indiameter. At the surface, the U-pipesare joined together in groups of sixthat radiate from the center to theouter edge , and then connect back tothe Energy Centre building. Theentire BTES field is then covered in alayer of insulation and then soil with a landscaped park built on top.

When solar heated water is availableto be stored, it is pumped into thecentre of the BTES field and throughthe U-pipe series. Heat is transferredto the surrounding soil and rock, andthe water gradually cools as itreaches the outer edge and returnsto the Energy Centre.

Conversely, when the homes requireheat, cooler water is pumped into theedges of the BTES field and as thewater flows to the centre it picks upheat. The heated water passes tothe short-term storage tank in theEnergy Centre and is then circulatedto the homes through the districtheating loop. All pumps and controlvalves are housed in theneighbouring Energy Centre building.

Even with sunny Alberta weather, it will take approximately three years to fullycharge the BTES field. In the first years of operation, the field will operate atrelatively low temperatures, and the recoverable energy will be largelydepleted before the end of the heating season. However, after a few years ofoperation, the core temperature of the BTES field will approach 80C by theend of summer, with sufficient heat for almost an entire heating season.
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borehole thermal energy storage_ dlsc

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