Hvac system for buildings

Abstract

A ventilation system comprises a plurality of axial fan units, each having at least one axial fan having a rotational axis generally parallel to a downstream flow caused by the axial fan, and at least one grill positioned adjacent to the at least one axial fan in a downstream flow path of the axial fan unit, the at least one grill directing an air flow of the axial fan. At least a first series of the plurality of axial fan units is adapted to be positioned at a top of a plenum arrangement extending from a bottom front of a refrigerated enclosure, to a rear back of the refrigerated enclosure, said top being at a top of the rear back. At least a second series of the plurality of axial fan units is adapted to be positioned above an area to cool and oriented to project its downstream flow in a downward direction to direct its downstream flow to said area to cool. The first series of the plurality of axial fan units is oriented to project its downstream flow in an upward direction toward the second series of the plurality of axial fan units such that the first series is adapted to direct air from the plenum arrangement to the second series.

1 . A ventilation system comprising:
 a plurality of axial fan units, each having at least one axial fan having a rotational axis generally parallel to a downstream flow caused by the axial fan, and at least one grill positioned adjacent to the at least one axial fan in a downstream flow path of the axial fan unit, the at least one grill directing an air flow of the axial fan;   wherein at least a first series of the plurality of axial fan units is adapted to be positioned at a top of a plenum arrangement extending from a bottom front of a refrigerated enclosure, to a rear back of the refrigerated enclosure, said top being at a top of the rear back;   wherein at least a second series of the plurality of axial fan units is adapted to be positioned above an area to cool and oriented to project its downstream flow in a downward direction to direct its downstream flow to said area to cool; and   wherein the first series of the plurality of axial fan units is oriented to project its downstream flow in an upward direction toward the second series of the plurality of axial fan units such that the first series is adapted to direct air from the plenum arrangement to the second series.   
     
     
         2 . The ventilation system according to  claim 1 , wherein the at least one grill is at least one double louver grill. 
     
     
         3 . The ventilation system according to  claim 2 , wherein a plurality of vents defined by the double louver grill each have a rectangular shape having a length ranging between 0.375″ and 1.125″. 
     
     
         4 . The ventilation system according to  claim 3 , wherein the plurality of vents defined by the double louver grill each have a width ranging between 0.375″ and 1.125″. 
     
     
         5 . The ventilation system according to  claim 3 , wherein the plurality of vents defined by the double louver grill each have a depth of at least 0.25″. 
     
     
         6 . The ventilation system according to  claim 1 , comprising one of the at least one grill for each said axial fan unit. 
     
     
         7 . A refrigeration controller system for operating a refrigeration, a ventilation system and a HVAC system comprising:
 a processing unit, and   
       a non-transitory computer-readable memory communicatively coupled to the processing unit and comprising computer-readable program instructions executable by the processing unit for
 operating the refrigeration system to cool refrigerated enclosures; 
 operating the ventilation system according to  claim 1  to provide cold heat to a facility recuperated from said refrigerated enclosures; 
 reclaiming heat from the refrigeration system; and 
 operating the HVAC system with the heat reclaimed from the refrigeration system to provide heated air; 
 wherein the refrigeration controller system operates when an outdoor temperature is greater than 20 C. 
 
     
     
         8 . A heating, ventilating and air conditioning (HVAC) system, comprising:
 a central unit, comprising:
 a compressor operable to provide compressed refrigerant, 
 a condenser at a refrigerant inlet fluidly connected to a refrigerant outlet of the compressor via a compressed refrigerant line to receive the compressed refrigerant from the compressor, and 
 a first fan operatively connected to the condenser to move air through the condenser; 
   a plurality of terminal units, each terminal unit of the plurality of terminal units comprising, in serial air flow communication:
 a cooling coil fluidly connected:
 at a refrigerant inlet thereof, to a refrigerant outlet of the condenser to receive refrigerant from the condenser, and 
 at a refrigerant outlet thereof, to a refrigerant inlet of the compressor to supply evaporated refrigerant to the refrigerant inlet of the compressor; 
 
 a heating coil fluidly connected:
 at a refrigerant inlet thereof, to the compressed refrigerant line at a first location that is fluidly between the refrigerant outlet of the compressor and the refrigerant inlet of the condenser, and 
 at a refrigerant outlet thereof, to the compressed refrigerant line at a second location that is fluidly between the first location and the refrigerant inlet of the condenser; and 
 
 a second fan operable to move air through the cooling coil and the heating coil. 
   
     
     
         9 . The HVAC system of  claim 8 , wherein the plurality of terminal units includes a horizontal terminal unit configured such that the second fan of the horizontal terminal unit ejects air out of the horizontal terminal unit in a horizontal direction when the horizontal terminal unit is installed. 
     
     
         10 . The HVAC system of  claim 9 , wherein the second fan of the horizontal terminal unit is a plurality of axial fans. 
     
     
         11 . The HVAC system of  claim 8 , wherein the plurality of terminal units includes a vertical terminal unit configured to supply air in a vertical direction when the vertical terminal unit is installed. 
     
     
         12 . The HVAC system of  claim 11 , wherein the second fan of the vertical terminal unit is a single axial fan. 
     
     
         13 . The HVAC system of  claim 8 , further comprising a check valve in the compressed refrigerant line fluidly between the first and second locations, the check valve oriented to allow refrigerant flow from the first location toward the second location and to prevent refrigerant flow from the second location toward the first location. 
     
     
         14 . The HVAC system of  claim 8 , further comprising a water unit a volume for storing water and a heat exchanger disposed in the volume, the heat exchanger fluidly connected:
 at a refrigerant inlet thereof, to the compressed refrigerant line at the first location, and   at a refrigerant outlet thereof, to the compressed refrigerant line at the second location.   
     
     
         15 . The HVAC system of  claim 14 , wherein the water unit is a domestic hot water tank. 
     
     
         16 . The HVAC system of  claim 8 , further comprising a refrigerant expansion valve fluidly between the refrigerant outlet of the condenser and the refrigerant inlets of the cooling coils of the plurality of terminal units. 
     
     
         17 . The HVAC system of  claim 8 , further comprising a refrigerant flow control valve fluidly upstream of the refrigerant inlet of the heating coil of each of the plurality of terminal units. 
     
     
         18 . The HVAC system of  claim 8 , wherein the refrigerant flow control valve is a first refrigerant flow control valve and further comprising a second refrigerant flow control valve fluidly upstream of the refrigerant inlet of the cooling coil of each of the plurality of terminal units.