How does the Earth to Air System differ from conventional water-source geothermal systems?
Most conventional water-source geothermal systems are presently closed-loop systems, as open-loop systems can cause bacterial ground-water contamination and are prohibited in various states. Closed-loop water-source systems require three heat transfer steps, namely: • ground to water • water to refrigerant • refrigerant to air (vice-versa in the cooling mode). Further, water-source systems require the operation of a water pump, and generally require about 150′ to 250′ of drilling depth/length per ton of system design capacity. In comparison, the Earth to Air system requires only two heat transfer steps: • ground to refrigerant • refrigerant to air (vice-versa in the cooling mode), and does not require any water pump operation (or any water pump maintenance) ETA systems generally only require about 100′ to 125′ of drilling depth/length per ton of system design capacity (one of ETA’s prototype units heated and cooled a home for one year with a 74′ per ton drilling depth). Further, the ET
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