Patent ID: 8931295
Filing Date: 2015-01-13
Classification: F25B

Abstract:
1. A direct exchange geothermal heating/cooling system comprising: a geothermal heat exchange field; refrigerant transport lines including a liquid refrigerant transport line and a vapor refrigerant transport line; a compressor sized between 80% and 95% of a maximum heating/cooling load; expansion devices; a heat exchanger; an oil separator having a filter configured to separate a particle size no greater than approximately 0.3 microns and to provide at least approximately 98% efficiency; a refrigerant having an operating pressure at least 25% greater than R-22; a high pressure cut-off switch operably coupled to the compressor and configured to shut off the compressor when an operational system pressure reaches approximately 500 psi, plus or minus approximately 25 psi; and wherein each of the geothermal heat exchange field, refrigerant transport lines, compressor, expansion devices, heat exchanger, oil separator, and high pressure cut-off switch has at least a 25% greater safe working load strength than a safe working load strength of components in an R-22 refrigerant system.