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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.:

US 9657977 B1

PDFFull Text
Date of Patent:
May. 23, 2017

Filed:

Aug. 22, 2016

Cascade refrigeration system with modular ammonia chiller units

Applicant:

Hill Phoenix, Inc., Conyers, GA (US);

Inventors:

David K. Hinde, Atlanta, GA (US);

John D. Bittner, Bethlehem, GA (US);

Shitong Zha, Conyers, GA (US);

Joe T. Wilkerson, Jr., Covington, GA (US);

Assignee:

Hill Phoenix, Inc., Conyers, GA (US);

Attorney:

Foley & Lardner LLP

Primary Examiner:

Jonathan Bradford

Int. Cl.
CPC ...
F25B 43/02 (2006.01); F25B 31/00 (2006.01); F25B 7/00 (2006.01); F25B 49/02 (2006.01); F25B 43/00 (2006.01); F25B 9/00 (2006.01); F25B 25/00 (2006.01);
U.S. Cl.
CPC ...
F25B 43/02 (2013.01); F25B 7/00 (2013.01); F25B 9/002 (2013.01); F25B 25/005 (2013.01); F25B 31/004 (2013.01); F25B 43/003 (2013.01); F25B 43/006 (2013.01); F25B 49/02 (2013.01); F25B 2341/0016 (2013.01); F25B 2400/051 (2013.01); F25B 2400/23 (2013.01); F25B 2600/21 (2013.01); F25B 2700/03 (2013.01);
Abstract

A cascade refrigeration system includes an upper portion. The upper portion includes at least one modular chiller unit that provides cooling to at least one of a low temperature subsystem having a plurality of low temperature loads, and a medium temperature subsystem having a plurality of medium temperature loads. The modular chiller unit includes a refrigerant circuit, an ammonia refrigerant, an ammonia refrigerant accumulator, and an oil separation system. The refrigerant circuit includes at least a compressor, a condenser, an expansion device, and an evaporator. The ammonia refrigerant is configured for circulation within the refrigerant circuit. The ammonia refrigerant accumulator is configured to receive the ammonia refrigerant from the evaporator. The oil separation system is configured to remove oil from the ammonia refrigerant. The oil separation system includes an oil separator that is configured to remove oil from the ammonia refrigerant flowing from the compressor to the condenser, an oil drain pot that is configured to collect oil from the evaporator, and an oil reservoir that is configured to collect oil from the oil separator and the oil drain pot.

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