Air handler

Abstract

The present disclosure provides an air handler having a cabinet and a plurality of refrigerant tubes, where each refrigerant tube has a diameter of 7 mm. The air handler includes a V-shaped round tube plate fin heat exchanger disposed within the cabinet and including a plurality of louvered fins. Each louvered fin defines a plurality of holes configured to receive the refrigerant tubes. The plurality of holes defines a linear offset configuration of the louvered fin. The air handler further includes an axial fan housing disposed within the cabinet and located downstream of the V-shaped round tube plate fin heat exchanger, a distributor in fluid communication with the refrigerant tubes, and a plurality of feeder tubes extending between the distributor and the refrigerant tubes. Each feeder tube is configured to allow flow of refrigerant therethrough.

1 . An air handler comprising:
 a cabinet;   a plurality of refrigerant tubes, each refrigerant tube having a diameter of 7 mm;   a V-shaped round tube plate fin heat exchanger disposed within the cabinet and comprising a plurality of louvered fins, wherein each louvered fin defines a plurality of holes configured to receive the refrigerant tubes, and wherein the plurality of holes defines a linear offset configuration of the louvered fin;   an axial fan housing disposed within the cabinet and located downstream of the V-shaped round tube plate fin heat exchanger;   a distributor in fluid communication with the refrigerant tubes; and   a plurality of feeder tubes extending between the distributor and the refrigerant tubes, each feeder tube configured to allow flow of refrigerant therethrough.   
     
     
         2 . The air handler of  claim 1 , wherein the linear offset configuration of the plurality of holes comprises:
 a first set of holes defined along a first axis;   a second set of holes defined along a second axis, wherein the second set of holes are offset from the first set of holes along a longitudinal axis of the louvered fin; and   a third set of holes defined along a third axis, wherein the third set of holes are offset from the second set of holes along the longitudinal axis of the louvered fin, and wherein a first offset distance defined between the second set of holes and the first set of holes is greater than a second offset distance defined between the third set of holes and the second set of holes, wherein each of the first axis, the second axis, and the third axis extends substantially parallel to the longitudinal axis of the louvered fin, and   wherein the second set of holes and the third set of holes define a substantially obtuse trapezoidal matrix.   
     
     
         3 . The air handler of  claim 2 , wherein each of two opposite wider angles of the obtuse trapezoidal matrix is in a range of about 95 degrees to about 105 degrees. 
     
     
         4 . The air handler of  claim 1 , wherein a length of each feeder tube is in a range of 20 inches to 30 inches. 
     
     
         5 . The air handler of  claim 1 , wherein a ratio of sum of pressure drops across the distributor and across the feeder tube to the pressure drop across the V-shaped round tube plate fin heat exchanger is in a range of about 3 to 7. 
     
     
         6 . The air handler of  claim 1 , wherein a ratio of sum of pressure drops across the distributor and across the feeder tube to the pressure drop across the V-shaped round tube plate fin heat exchanger is 3. 
     
     
         7 . The air handler of  claim 1 , wherein each of the plurality of holes forms an interference fit with an outer surface of the refrigerant tube passing therethrough. 
     
     
         8 . The air handler of  claim 1 , wherein each of the plurality of louvered fins defines at least one cropped corner. 
     
     
         9 . The air handler of  claim 1 , wherein the axial fan housing is disposed vertically above the V-shaped round tube plate fin heat exchanger. 
     
     
         10 . A heating, ventilation, and air conditioning (HVAC) system comprising:
 a plurality of refrigerant tubes;   a V-shaped round tube plate fin heat exchanger comprising a plurality of louvered fins, wherein each louvered fin defines a plurality of holes configured to receive the refrigerant tubes, and wherein the plurality of holes defines a linear offset configuration of the louvered fin;   an axial fan housing disposed downstream of the V-shaped round tube plate fin heat exchanger;   a distributor in fluid communication with the refrigerant tubes; and   a plurality of feeder tubes extending between the distributor and the refrigerant tubes, each feeder tube configured to allow flow of refrigerant therethrough.   
     
     
         11 . The HVAC system of  claim 10 , wherein the linear offset configuration of the plurality of holes comprises:
 a first set of holes defined along a first axis;   a second set of holes defined along a second axis, wherein the second set of holes are offset from the first set of holes along a longitudinal axis of the louvered fin; and   a third set of holes defined along a third axis, wherein the third set of holes are offset from the second set of holes along the longitudinal axis of the louvered fin, and wherein a first offset distance defined between the second set of holes and the first set of holes is greater than a second offset distance defined between the third set of holes and the second set of holes.   
     
     
         12 . The HVAC system of  claim 11 , wherein each of the first axis, the second axis, and the third axis extends substantially parallel to the longitudinal axis of the louvered fin, and
 wherein the second set of holes and the third set of holes define a substantially obtuse trapezoidal matrix.   
     
     
         13 . The HVAC system of  claim 12 , wherein each of two opposite wider angles of the obtuse trapezoidal matrix is in a range of about 95 degrees to about 105 degrees. 
     
     
         14 . The HVAC system of  claim 10 , wherein a length of each feeder tube is in a range of 20 inches to 30 inches. 
     
     
         15 . The HVAC system of  claim 10 , wherein a ratio of sum of pressure drops across the distributor and across the feeder tube to the pressure drop across the V-shaped round tube plate fin heat exchanger is in a range of about 3 to 7. 
     
     
         16 . The HVAC system of  claim 10 , wherein a ratio of sum of pressure drops across the distributor and across the feeder tube to the pressure drop across the V-shaped round tube plate fin heat exchanger is 3. 
     
     
         17 . The HVAC system of  claim 10 , wherein each of the plurality of holes forms an interference fit with an outer surface of the refrigerant tube passing therethrough. 
     
     
         18 . The HVAC system of  claim 10 , wherein each of the plurality of louvered fins defines at least one cropped corner. 
     
     
         19 . The HVAC system of  claim 10 , wherein the axial fan housing is disposed vertically above the V-shaped round tube plate fin heat exchanger. 
     
     
         20 . An HVAC system comprising:
 an outdoor unit; and   an air handler comprising:   a plurality of refrigerant tubes;   a V-shaped round tube plate fin heat exchanger comprising a plurality of louvered fins, wherein each louvered fin defines a plurality of holes configured to receive the refrigerant tubes, and wherein the plurality of holes defines a linear offset configuration of the louvered fin;   an axial fan housing disposed downstream of the V-shaped round tube plate fin heat exchanger;   a distributor in fluid communication with the refrigerant tubes; and   a plurality of feeder tubes extending between the distributor and the refrigerant tubes, each feeder tube configured to allow flow of refrigerant therethrough.