Geothermal heating and cooling system with solar heating

• US 7,234,314 B1
• Filed: 07/10/2003
• Issued: 06/26/2007
• Est. Priority Date: 01/14/2003
• Status: Expired due to Fees

• Current Assignee: Earth To Air Systems, LLC
• Original Assignee: Earth To Air Systems, LLC
• Inventors: Wiggs, B. Ryland
• Primary Examiner(s): Ali; Mohammad M.
• Application Number:
  US10/616,701
• Time in Patent Office: 1,447 Days
• Field of Search: 622/60, 622/36, 622/351, 622/386, 165/45
• US Class Current: 62/235.1
• CPC Class Codes: F24S 10/00 Solar heat collectors using working fluids
• CPC Class Codes: F24T 10/15 using bent tubes; using tubes assembled with connectors or with return headers
• CPC Class Codes: F24T 10/30 using underground reservoirs for accumulating working fluids or intermediate fluids
• CPC Class Codes: F25B 27/005 in compression type systems
• CPC Class Codes: F25B 30/06 characterised by the source of low potential heat
• CPC Class Codes: Y02E 10/10 Geothermal energy
• CPC Class Codes: Y02E 10/44 Heat exchange systems

Abstract

A sealed well direct expansion geothermal heat exchange unit, whose sealed well can be placed in ground and/or in water, consisting of a conventional direct expansion, or other heat pump, system wherein the exterior refrigerant heat exchange lines are placed within an insulated and sealed container, which container is supplied with a circulating heat conductive liquid from and to a sub-surface sealed well encasement, which container liquid may be supplemented with heat from a solar heating system, and which unit'"'"'s hot refrigerant vapor line may be supplementary cooled by means of condensate water evaporative cooling, as well as a means to provide any direct expansion, and any closed-loop water-source, geothermal heat pump system with an optional solar heating supplement in the heating mode, and with an optional water-cooled vapor line supplement in the cooling mode.

Claims

1. A direct expansion (“

DX”

) geothermal heat exchange system having a DX geothermal heat pump operable in a heating mode and including a sub-surface geothermal heat exchanger comprising sub-surface refrigerant tubing positioned to allow primary geothermal heat transfer directly to refrigerant fluid circulating in the sub-surface refrigerant tubing, the system further comprising a supplemental solar heating system including a solar heat collector fluidly connected to a solar heat to direct expansion system refrigerant fluid heat exchanger by fluid transport tubing, wherein solar heat acquired from the solar heat collector is conveyed by means of a fluid within the fluid transport tubing, and the solar heat is transferred by the solar heat to direct expansion system refrigerant fluid heat exchanger to the refrigerant fluid in the DX geothermal heat pump.

2. The system of claim 1 wherein the fluid transport tubing between the solar heat collector and the solar heat to refrigerant fluid heat exchanger is insulated, and wherein the exterior of the solar heat to refrigerant fluid heat exchanger is insulated.

3. The system of claim 1 wherein the solar heat to refrigerant fluid heat exchanger is located at an elevation above that of the solar heat collector.

4. The system of claim 1 further comprising a solar heat transfer termination device, which solar heat transfer termination device is activated only when the DX geothermal heat exchange system is operating in a cooling mode, and during periods of time when supplemental heat supplied by the solar heat collector is at a lower temperature than a maximum temperature in the sub-surface geothermal heat exchanger.

5. The system of claim 1 further comprising refrigerant tubing fluidly connected to the solar heat to direct expansion refrigerant fluid heat exchanger, the refrigerant tubing including an inverted U bend.

6. In a geothermal direct expansion (“

DX”

) heat exchange system, having a DX geothermal heat pump operable in a heating mode and including a sub-surface geothermal heat exchanger, an improvement comprising a supplemental solar heating system including a solar heat collector fluidly connected to a solar heat to direct expansion system refrigerant fluid heat exchanger by transport tubing, wherein solar heat acquired from the solar heat collector is conveyed by means of a fluid within the transport tubing, and the solar heat is transferred by the solar heat to direct expansion system refrigerant fluid heat exchanger to refrigerant fluid immediately prior to the refrigerant fluid entering the sub-surface geothermal heat exchanger.

7. A direct expansion geothermal heat exchange system, operating in the heating mode, comprising a supplemental solar heating system wherein heat acquired from a solar heat collector is conveyed by means of a fluid within transport tubing, and the solar heat is transferred, by a solar heat to direct expansion system refrigerant fluid heat exchange means, to the refrigerant fluid in a direct expansion system, wherein the solar collector'"'"'s heat transfer tubing is always sloped in an upward vertical orientation from the bottom of the solar heat collector to the top of the solar heat to direct expansion refrigerant fluid heat exchange means, and wherein the solar collector'"'"'s heat transfer tubing is always sloped in a downward vertical orientation from the top of the solar heat to direct expansion refrigerant fluid heat exchange means to the bottom of the solar heat collector.

8. A direct expansion geothermal heat exchange system, operating in the heating mode, comprising a supplemental solar heating system wherein heat acquired from a solar heat collector is conveyed by means of a fluid within transport tubing, and the solar heat is transferred, by a solar heat to direct expansion system refrigerant fluid heat exchange means, to the refrigerant fluid in a direct expansion system, wherein the solar heat to direct expansion refrigerant fluid heat exchange means is situated at a point in the direct expansion system'"'"'s liquid refrigerant transport line after the direct expansion system'"'"'s heating mode refrigerant expansion device and before the point where the direct expansion system'"'"'s thermally exposed sub-surface refrigerant transport geothermal heat exchange tubing is located.

9. A geothermal heat exchange system, operating in the heating mode, comprising:

a geothermal heat pump, the geothermal heat pump including system refrigerant tubing and system refrigerant moving through the refrigerant tubing;

wherein at least a portion of the system refrigerant tubing is positioned in a sub-surface location to allow for primary geothermal heat transfer directly into the system refrigerant;

a supplemental solar heating system, the supplemental solar heating system including a solar collector, solar heating transport tubing thermally coupled to the solar collector, and solar heating fluid moving within the solar heating transport tubing;

a heat exchanger thermally coupled to the supplemental solar heating system and to the geothermal heat pump; and

;

wherein heat acquired from the solar collector is conveyed to the solar heat heating fluid within the solar heating transport tubing, and the solar heat is then transferred by the heat exchanger to the system refrigerant in the system refrigerant tubing.