# US 8,539,785 B2 · Condensing unit having fluid injection > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,539,785 B2 - Document ID: US8539785B2 - Status: Granted - Kind: B2 - Application number: 12/705,030 - Filed: 2010-02-12 - Published: 2010-08-19 - Granted: 2013-09-24 - Earliest claimed: 2009-02-18 - Assignees: Emerson Climate Technologies, Inc. - Applicants: Chao Jiang; Ying Wang - Inventors: Chao Jiang; Ying Wang - Web page: https://patentgrep.com/patent/US8539785B2 ## CPC - F25B 49/027: {Condenser control arrangements} - F25B 1/10: with multi-stage compression (with cascade operation F25B7/00) - F25B 41/35: by rotary motors, e.g. by stepping motors - F25B 2400/13: Economisers - F25B 2600/21: Refrigerant outlet evaporator temperature - F25B 2600/2509: Economiser valves - F25B 2600/2513: Expansion valves - F25B 2700/21: Temperatures - F25B 2700/2106: of fresh outdoor air - F25B 2700/21152: at the discharge side of the compressor - Y02B 30/70: Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A climate control system is provided and may include a compressor, a first heat exchanger in fluid communication with the compressor, a second heat exchanger in fluid communication with the compressor and the first heat exchanger, and a third heat exchanger disposed between the first heat exchanger and the second heat exchanger. A conduit may be fluidly coupled to the third heat exchanger and the compressor and may selectively supply fluid to the compressor. A valve may control a volume of fluid supplied to the compressor via the conduit and a controller may control the valve based on a discharge temperature of the compressor and a super heat temperature of the third heat exchanger. ## Claims ### Claim 1 A condensing unit comprising: a base; a compressor supported by said base; a first heat exchanger supported by said base and in fluid communication with said compressor; a second heat exchanger supported by said base and in fluid communication with said first heat exchanger and said compressor; a conduit fluidly coupled to said second heat exchanger and said compressor and operable to selectively supply fluid to said compressor; a valve operable to control a volume of fluid supplied to said compressor via said conduit; and a controller operable to control said valve based on a discharge temperature of said compressor and a super heat temperature of said second heat exchanger. ### Claim 2 (depends on 1) The condensing unit of claim 1, wherein said valve opens and closes in steps to control said fluid into said conduit. ### Claim 3 (depends on 1) The condensing unit of claim 1, wherein said second heat exchanger includes a first inlet, a first outlet, a second inlet, and a second outlet. ### Claim 4 (depends on 3) The condensing unit of claim 3, further comprising a first temperature sensor disposed between said first outlet and said second inlet. ### Claim 5 (depends on 4) The condensing unit of claim 4, further comprising a second temperature sensor disposed proximate to said second outlet of said second heat exchanger. ### Claim 6 (depends on 5) The condensing unit of claim 5, wherein said super heat temperature is based on information received from said first temperature sensor and said second temperature sensor. ### Claim 7 (depends on 5) The condensing unit of claim 5, wherein said second temperature sensor is disposed between said second outlet of said second heat exchanger and said compressor. ### Claim 8 (depends on 3) The condensing unit of claim 3, wherein said valve is disposed between said first outlet and said first temperature sensor. ### Claim 9 (depends on 1) The condensing unit of claim 1, further comprising a first temperature sensor disposed between said valve and said second heat exchanger. ### Claim 10 (depends on 9) The condensing unit of claim 9, further comprising a second temperature sensor disposed between said second heat exchanger and said compressor. ### Claim 11 (depends on 1) The condensing unit of claim 1, wherein said second heat exchanger is a plate-heat exchanger. ### Claim 12 (depends on 1) The condensing unit of claim 1, further comprising a discharge temperature sensor disposed proximate to an outlet of said compressor and providing said discharge temperature. ### Claim 13 (depends on 1) The condensing unit of claim 1, wherein said discharge temperature is measured approximately every twenty seconds. ### Claim 14 (depends on 1) The condensing unit of claim 1, wherein said valve is an electronic expansion valve. ### Claim 15 (depends on 1) The condensing unit of claim 1, wherein said valve is controlled to maintain said discharge temperature within a predetermined temperature range. ### Claim 16 A condensing unit comprising: a base; a compressor supported by said base and including a suction port, a discharge port, and a fluid-injection port; a first heat exchanger supported by said base and in fluid communication with said discharge port; a second heat exchanger supported by said base and including a first inlet fluidly coupled to said first heat exchanger, a first outlet, a second inlet fluidly coupled to said first outlet, and a second outlet; a conduit fluidly coupled to said second outlet of said second heat exchanger and said fluid-injection port of said compressor; and a valve disposed between said first outlet of said second heat exchanger and said second inlet of said second heat exchanger. ### Claim 17 (depends on 16) The condensing unit of claim 16, wherein said compressor is a scroll compressor. ### Claim 18 (depends on 16) The condensing unit of claim 16, further comprising a first temperature sensor disposed between said first outlet of said second heat exchanger and said second inlet of said second heat exchanger, a second temperature sensor disposed between said second outlet of said second heat exchanger and said fluid-injection port of said compressor, and a third temperature sensor disposed proximate to said discharge port. ### Claim 19 (depends on 18) The condensing unit of claim 18, further comprising a controller in communication with said first temperature sensor, said second temperature sensor, and said third temperature sensor. ### Claim 20 (depends on 19) The condensing unit of claim 19, wherein said controller controls said valve based on information from said first temperature sensor, said second temperature sensor, and said third temperature sensor. ### Claim 21 (depends on 19) The condensing unit of claim 19, wherein said second heat exchanger is a plate-heat exchanger. ### Claim 22 (depends on 19) The condensing unit of claim 19, wherein said valve is an electronic expansion valve. ### Claim 23 (depends on 19) The condensing unit of claim 19, wherein said valve includes a stepper motor.