Induction supply air terminal unit with increased air induction ratio, method of providing increased air induction ratio

Abstract

The present invention relates to an induction supply air terminal device where primary air flow is used to induce a secondary air flow wherein the nozzles are provided in the form of a cluster arrangement, comprising one or more clusters of three or more nozzles each. The clusters can be arranged according to predetermined patterns depending on the pattern of air induction that is desired.

1 . An induction supply air terminal device that comprises of primary supply air chamber, connected with at least one mixing chamber which opens into an air-conditioned room space, at least one or no heat exchangers provided connected with each said mixing chamber, wherein an array of multiple nozzles is provided on one surface of the primary supply air chamber in the form of a cluster to supply primary air flow into at least one mixing chamber to induce a secondary air flow heated or cooled as it flows through a heat exchanger and conducted into the mixing chamber, wherein both the primary supply air and secondary air mix, whereby this mixed air is then conducted into the air-conditioned room space with an increased air induction ratio. 
     
     
         2 . A device as claimed in  claim 1  wherein the array of multiple nozzles in a cluster comprises three or more number of nozzles. 
     
     
         3 . A device as claimed in  claim 1  wherein the nozzles in a cluster are selected from circular, rectangular, elliptical and scalloped shape nozzles. 
     
     
         4 . A device as claimed in  claim 1  wherein the nozzles in a cluster comprise holes or punched collars in a sheet metal plate or conical nozzles fixed over an opening in a sheet metal plate. 
     
     
         5 . A device as claimed in  claim 1  wherein the nozzles in a cluster are made of metal, plastic or rubber. 
     
     
         6 . A device as claimed in  claim 1  wherein the cluster of multiple nozzles form a multiple air jet zone of length (l 1 ) through air jets, said zone converging into a single air jet at a distance l 1 , forming into a single air jet zone of length (l 2 ). 
     
     
         7 . A device as claimed in  claim 1  wherein the distance (d 1 ) between an array of nozzles in a cluster is smaller than the distance (d 2 ) between any two clusters of nozzles. 
     
     
         8 . A device as claimed in  claim 1  wherein additionally a venturi device is provided disposed of in the air jet zone at a predetermined distance from the cluster nozzle array. 
     
     
         9 . A device as claimed in  claim 8  wherein the venturi is a fixed venturi. 
     
     
         10 . A device as claimed in  claim 8  wherein the venturi is an adjustable venturi. 
     
     
         11 . A device as claimed in  claim 8  wherein the location of the venturi is a function of the optimum central line velocity in the venturi neck, in turn depending on the primary air flow rate, the face area of the nozzle(s) and the secondary air flow. 
     
     
         12 . A device as claimed in  claim 8  wherein the neck diameter of venturi is set equal to the diameter of the air jet at the same location. 
     
     
         13 . A device as claimed in  claim 10  wherein the location of the venturi and/or the neck diameter of the venturi is adjustable manually, or automatically by an actuator. 
     
     
         14 . A device as claimed in  claim 8  wherein the venturi is selected from a solid or inflatable venturi, or a venturi with a bent metal/plastic sheet fixed at one end and an adjustable another end. 
     
     
         15 . An induction supply air terminal device comprising of primary supply air chamber, at least one mixing chamber which opens into an air-conditioned room space, at least one or no heat exchanger, one or more nozzles provided on said primary air supply chamber to supply primary air flow into said at least one mixing chamber to induce a secondary air flow that is heated or cooled as it flows through a heat exchanger and conducted into said mixing chamber, wherein both this primary supply air and secondary air mix, whereby this mixed air is then conducted into the air-conditioned room space, wherein an adjustable venturi is provided to increase the secondary air flow rate. 
     
     
         16 . A device as claimed in  claim 15  wherein the location of the venturi is a function of the optimum central line velocity in the venturi neck, in turn depending on the primary air flow rate, the face area of the nozzle(s) and the secondary air flow. 
     
     
         17 . A device as claimed in  claim 15  wherein the neck diameter of venturi is set equal to the diameter of the air jet at the same location. 
     
     
         18 . A device as claimed in  claim 15  wherein the location of the venturi and/or the neck diameter of the venturi is adjustable manually, or automatically by an actuator. 
     
     
         19 . A device as claimed in  claim 15  wherein the venturi is selected from a solid or inflatable venturi, or a venturi with a bent metal/plastic sheet fixed at one end and an adjustable another end. 
     
     
         20 . A device as claimed in  claim 15  wherein the nozzles are present as a cluster of nozzles in an array. 
     
     
         21 . An induction supply air terminal device comprising of primary supply air chamber, at least one mixing chamber which opens into an air-conditioned room space, at least one or no heat exchanger, an array of multiple nozzles is provided on one surface of the primary supply air chamber in the form of a cluster to supply primary air flow pinto said at least one mixing chamber to induce a secondary air flow that is heated or cooled as it flows through a heat exchanger and conducted into said mixing chamber, wherein both this primary supply air and secondary air mix, whereby this mixed air is then conducted into the air-conditioned room space, wherein an adjustable venturi  9  is provided to increase the secondary air flow rate. 
     
     
         22 . A device as claimed in  claim 21  wherein the location of the venturi is a function of the optimum central line velocity in the venturi neck, in turn depending on the primary air flow rate, the face area of the nozzle(s) and the secondary air flow. 
     
     
         23 . A device as claimed in  claim 21  wherein the neck diameter of venturi is set equal to the diameter of the air jet at the same location. 
     
     
         24 . A device as claimed in  claim 21  wherein the location of the venturi and/or the neck diameter of the venturi is adjustable manually, or automatically by an actuator. 
     
     
         25 . A device as claimed in  claim 21  wherein the venturi is selected from a solid or inflatable venturi, or a venturi with a bent metal/plastic sheet fixed at one end and an adjustable another end. 
     
     
         26 . A device as claimed in  claim 21  wherein the array of multiple nozzles in a cluster comprises three or more number of nozzles. 
     
     
         27 . A device as claimed in  claim 21  wherein the nozzles in a cluster are selected from circular, rectangular, elliptical and scalloped shape nozzles. 
     
     
         28 . A device as claimed in  claim 21  wherein the nozzles in a cluster comprise holes or punched collars in a sheet metal plate or conical nozzles fixed over an opening in a sheet metal plate. 
     
     
         29 . A device as claimed in  claim 21  wherein the nozzles in a cluster are made of metal, plastic or rubber. 
     
     
         30 . A device as claimed in  claim 21  wherein the cluster of multiple nozzles form a multiple air jet zone of length (l 1 ) through air jets, said zone converging into a single air jet at a distance l 1 , forming into a single air jet zone of length (l 2 ). 
     
     
         31 . A device as claimed in  claim 21  wherein the distance (d 1 ) between an array of nozzles in a cluster is smaller than the distance (d 2 ) between any two clusters of nozzles.