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Heat Pumps for Heating and Cooling The method chosen will depend on site characteristics, available drilling rig and budget. Vertical installations may require resource consent from the EPA or local regulation authorities for drilling activities. Once the required number of holes is drilled, two HDPE or PEX pipes are fed down each bore hole. The bottom ends of these pipes are fusion welded together with a U- bend to close the circulation loop. The top ends of the pipes (supply and return) are “headered” so that all the U-tube assemblies operate in parallel (e.g., one side of each U-tube assembly is connected to a supply header, while the other side is connected to a return header). The headers are typically configured for reverse return flow with stepped piping sizes to maintain approximately the same head loss per unit length. This helps ensure equal flow distribution through each U-tube assembly. All earth loops, especially those with buried (inaccessible) fusion joints, should be pressure tested with compressed air to at least 75 psi for at least 24 hours to ensure there are absolutely no leaks. Backfill and Grouts After testing, each bore hole is carefully backfilled with grout slurry (bentonite) or thermally enhanced, low permeability clay mixed with a fine aggregate such as sand. The grouting fills any air voids around the tubing and earth and plays a major part in maximizing the conductive heat transfer. Grouting also seals the borehole off from surface water penetration. Standard grout actually has a poor conductivity, so the 33PDF Image | Heat Pumps for Heating and Cooling
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
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