Patent ID: 8468842
Filing Date: 2013-06-25
Classification: F25B

Abstract:
1. A direct exchange heating and cooling system operable in a cooling mode, comprising: a compressor having a compressor inlet and a compressor outlet; an exterior sub-surface heat exchanger; an interior heat exchanger having an interior heat exchanger inlet and an interior heat exchanger outlet; a liquid refrigerant transport line extending from the exterior sub-surface heat exchanger to the interior heat exchanger inlet; a vapor refrigerant transport line extending from the interior heat exchanger outlet to the compressor inlet; a hot gas discharge line extending from the compressor outlet to the exterior sub-surface heat exchanger; a bypass line fluidly communicating between the hot gas discharge line and a connection point provided on the vapor refrigerant transport line; and a bypass valve disposed in the bypass line, the bypass valve having a normally closed position and being configured to selectively open to directly communicate heated refrigerant from the hot gas discharge line to the vapor refrigerant transport line, wherein the connection point is sufficiently proximate the interior heat exchanger outlet so that the heated refrigerant from the hot gas discharge line generates a back pressure in the interior heat exchanger.