The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 13, 1991
Filed:
Dec. 05, 1989
David P Hart, Delaware, OH (US);
Other;
Abstract
The present invention is a heat pump system having a direct earth coupled underground heat exchanging apparatus. The system uses a heat exchanging fluid existing in both gaseous and liquid form during operation and includes ancillary equipment and associated controls for carrying out various functions such as cooling, heating, refrigeration and water heating. By effectively utilizing the excellent heat conservation characteristics and huge heat capacity of subsurface earth or water, a greatly improved level of efficiency is achieved. The apparatus comprises a compressor 1, an expansion valve 8, a receiver 7, an indoor evaporator/condenser coil 5, a four way reversing valve 3, an accumulator 16 and a plurality of evaporator/condenser coils 11 disposed in the earth. The apparatus uses the native earth as a heat source in the heating mode and as heat sink in the cooling mode.