Condensing unit having fluid injection
View Patent ↗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.
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.
2. The condensing unit of claim 1 , wherein said valve opens and closes in steps to control said fluid into said conduit.
3. 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.
4. The condensing unit of claim 3 , further comprising a first temperature sensor disposed between said first outlet and said second inlet.
5. The condensing unit of claim 4 , further comprising a second temperature sensor disposed proximate to said second outlet of said second heat exchanger.
6. 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.
7. 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.
8. The condensing unit of claim 3 , wherein said valve is disposed between said first outlet and said first temperature sensor.
9. The condensing unit of claim 1 , further comprising a first temperature sensor disposed between said valve and said second heat exchanger.
10. The condensing unit of claim 9 , further comprising a second temperature sensor disposed between said second heat exchanger and said compressor.
11. The condensing unit of claim 1 , wherein said second heat exchanger is a plate-heat exchanger.
12. 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.
13. The condensing unit of claim 1 , wherein said discharge temperature is measured approximately every twenty seconds.
14. The condensing unit of claim 1 , wherein said valve is an electronic expansion valve.
15. The condensing unit of claim 1 , wherein said valve is controlled to maintain said discharge temperature within a predetermined temperature range.
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.
17. The condensing unit of claim 16 , wherein said compressor is a scroll compressor.
18. 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.
19. 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.
20. 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.
21. The condensing unit of claim 19 , wherein said second heat exchanger is a plate-heat exchanger.
22. The condensing unit of claim 19 , wherein said valve is an electronic expansion valve.
23. The condensing unit of claim 19 , wherein said valve includes a stepper motor.