System and method for heating and cooling

Abstract

An HVAC system is provided. Embodiments of the present disclosure generally relate to heat exchangers having tubing with a reduced diameter compared to traditional systems. In one embodiment, a ducted HVAC system comprises an outdoor heat exchanger with tubing that has an outer diameter of eight millimeters (8 mm) or less and an indoor heat exchanger with tubing that has an outer diameter of nine millimeters (9 mm) or less. Additional systems, devices, and methods are also disclosed.

1 . A beating, ventilation, and air-conditioning (“HVAC”) system for providing conditioned air to a structure, comprising:
 an outdoor unit external to the structure, the outdoor unit comprising an outdoor heat exchanger comprising a first tubing with an outer diameter less than or equal to eight millimeters (8 mm); 
 an indoor heat exchanger disposed within the structure and coupled to the outdoor heat exchanger, the indoor heat exchanger comprising a second tubing with an outer diameter less than ⅜ inch, wherein the outer diameter of the first tubing is smaller than the outer diameter of the second tubing; 
 an airflow circulation system operable to circulate air from the structure over the indoor heat exchanger and then route the air back to the structure via ductworks; and 
 at least one electronic expansion valve in fluid communication with at least one of the outdoor or indoor heat exchangers and configured to reduce a pressure of a refrigerant flowing through the at least one electronic expansion valve. 
 
     
     
         2 . The system of  claim 1 , further comprising a compressor motor disposed in the outdoor unit. 
     
     
         3 . The system of  claim 1 , wherein the outdoor and indoor heat exchangers are coupled via a refrigerant loop and heat is absorbable from the structure by flowing the refrigerant through the indoor heat exchanger. 
     
     
         4 . The system of  claim 1 , wherein heat is absorbable from or releasable to the structure by flowing the refrigerant through the indoor heat exchanger. 
     
     
         5 . The system of  claim 1 , wherein the airflow circulation system is operable to circulate air from the structure over a gas furnace and then route the heated air back to the structure via the ductworks. 
     
     
         6 . The system of  claim 1 , wherein the refrigerant comprises at least 50%, in terms of weight, R32 refrigerant. 
     
     
         7 . The system of  claim 6 , wherein the refrigerant at least partially comprises a hydrofluoro-olefin (HFO) refrigerant. 
     
     
         8 . The system of  claim 1 , wherein the at least one electronic expansion valve is configured to reduce the pressure of the refrigerant by restricting flow of the refrigerant therethrough. 
     
     
         9 . A heating, ventilation, and air-conditioning (“HVAC”) system for providing conditioned air to a structure, comprising:
 an outdoor unit external to the structure and comprising an outdoor heat exchanger comprising tubing with an outer diameter less than or equal to eight millimeters (8 mm); 
 an indoor unit disposed within the structure and comprising an indoor heat exchanger coupled to the outdoor heat exchanger and comprising non-circular channel tubing comprising channels, each channel with an outer diameter of less than or equal to eight millimeters (8 mm), wherein the outer diameter of each channel of the indoor heat exchanger is smaller than the outer diameter of the tubing of the outdoor heat exchanger; and 
 at least one electronic expansion valve in fluid communication with at least one of the outdoor heat exchanger or the indoor heat exchanger and configured to reduce a pressure of a refrigerant flowing through the at least one electronic expansion valve. 
 
     
     
         10 . The system of  claim 9 , further comprising an airflow circulation system operable to circulate air from the structure over the indoor heat exchanger and then route the air back to the structure via ductworks. 
     
     
         11 . The system of  claim 9 , wherein the outdoor heat exchanger comprises a coiled-tube heat exchanger and the indoor heat exchanger comprises a micro-channel heat exchanger. 
     
     
         12 . The system of  claim 11 , further comprising a compressor motor disposed in the outdoor unit. 
     
     
         13 . The system of  claim 11 , wherein the indoor heat exchanger comprises a series of plates having the non-circular channel tubing formed therethrough. 
     
     
         14 . The system of  claim 11 , wherein the outer diameter of each channel is less than or equal to seven millimeters (7 mm). 
     
     
         15 . The system of  claim 9 , wherein heat is absorbable from or releasable to the structure by flowing the refrigerant through the indoor heat exchanger. 
     
     
         16 . The system of  claim 9 , wherein the at least one electronic expansion valve is configured to reduce the pressure of the refrigerant by restricting flow of the refrigerant therethrough. 
     
     
         17 . A heating, ventilation, and air-conditioning (“HVAC”) system for providing conditioned air to a structure, comprising:
 an outdoor unit disposed external to the structure and comprising an outdoor coiled-tube heat exchanger comprising a first tubing with an outer diameter less than or equal to eight millimeters (8 mm); 
 an indoor unit disposed within the structure and comprising an indoor coiled-tube heat exchanger coupled to the outdoor coiled-tube heat exchanger and comprising a second tubing with an outer diameter less than or equal to nine millimeters (9 mm), wherein the outer diameter of the first tubing is smaller than the outer diameter of the second tubing; 
 a first electronic expansion valve in fluid communication with the outdoor coiled-tube heat exchanger and configured to reduce a pressure of a refrigerant flowing through the first electronic expansion valve; 
 a second electronic expansion valve in fluid communication with the indoor coiled-tube heat exchanger and configured to reduce the pressure of the refrigerant flowing through the second electronic expansion valve; and 
 an airflow circulation system operable to circulate air from the structure over the indoor coiled-tube heat exchanger and then route the air back to the structure via ductworks. 
 
     
     
         18 . The system of  claim 17 , further comprising a first by-pass line to by-pass the first electronic expansion valve. 
     
     
         19 . The system of  claim 18 , further comprising a second by-pass line to by-pass the second electronic expansion valve. 
     
     
         20 . The system of  claim 17 , wherein the first electronic expansion valve and the second electronic expansion valve are configured to reduce the pressure of the refrigerant by restricting flow of the refrigerant therethrough.