Air conditioning units

Abstract

A ducted unit including a sound-insulated housing having a sound absorption coefficient of at least 0.05 W/m 2 at 100 Hz and wherein the sound-insulated housing contains an air circulation unit to draw air through the ducted unit, wherein the air circulation unit is operated to spin between around 1200 and 750 revolutions per minute.

1 . A ducted unit comprising a sound-insulated housing having a sound absorption coefficient of at least 0.05 W/m 2  at 100 Hz and wherein the sound-insulated housing contains an air circulation unit to draw air through the ducted unit, wherein the air circulation unit is operated to spin between around 1200 and 750 revolutions per minute. 
     
     
         2 . The ducted unit of  claim 1 , wherein the sound absorbing material has open cells or voids, through which noise travels and is dissipated, with the inner most surface of the sound insulating over which the air travels being substantially continuous and flat. 
     
     
         3 . The ducted unit of  claim 1 , wherein the sound insulated housing provides an enclosure for the air circulation unit to be arranged between an inlet and an outlet, wherein operation of the air circulation unit causes air to be drawn through the inlet and expelled through the outlet. 
     
     
         4 . The ducted unit according to  claim 3 , wherein the inlet and the outlet comprise ducts housed within the sound-insulated housing, wherein the ducted unit is a stand alone piece of equipment. 
     
     
         5 . The ducted unit of  claim 2 , in which the area of the inlet is greater than the area of the outlet. 
     
     
         6 . The ducted unit of  claim 1  suitable for use in an air-conditioning system, wherein the sound insulated housing comprises an enclosure suitable to arrange a radiator in the air flow. 
     
     
         7 . The ducted unit of  claim 3 , wherein the ducted unit has a plurality of inlets, and a plurality of outlets, the ducted unit having more inlets than outlets. 
     
     
         8 . The ducted unit of  claim 1  further comprising first and second outlets wherein the first and second outlets are connected to each other by outlet ducting to form a closed loop, the outlet ducting having at least two spaced apertures for ejecting air within the outlet ducting at substantially constant pressure. 
     
     
         9 . The ducted unit of  claim 8 , wherein the closed loop outlet ducting comprises at least one section of ducting connected at each end to an outlet of a ducted unit. 
     
     
         10 . The ducted unit of  claim 8 , wherein the outlet ducting of two or more ducted units are connected together, the closed loop outlet ducting therefore being formed by a plurality of outlet ducting sections, with each outlet ducting section being directly connected at one end to one outlet and the other end to a different outlet. 
     
     
         11 . The ducted unit of  claim 8 , wherein the closed loop outlet ducting has at least two outlet apertures per kW that the ducted unit is rated to. 
     
     
         12 . The ducted unit of  claim 8 , wherein solid or flexible tubing is arranged to extend from the closed loop outlet ducting in order to change the direction of airflow from one plane to a second plane. 
     
     
         13 . The ducted unit of  claim 8 , where each aperture has an area that is between 8% and 12% of the cross-sectional area of the closed loop outlet ducting. 
     
     
         14 . The ducted unit of  claim 8 , wherein the outlet ducting is formed from a section having a first chamber for supply air and a second chamber for return air. 
     
     
         15 . The ducted unit of  claim 8 , wherein the outlet ducting is formed from a section having a first chamber for supply air, wherein the section has a step formed on each outer side, wherein the side face of each step includes said apertures. 
     
     
         16 . The ducted unit of  claim 15 , wherein the outlet ducting includes a second, separate chamber for supply air, wherein the first and second chambers are arranged parallel to each other and the apertures on one side face are connected to one chamber and the apertures on the other side face are connected with the other chamber. 
     
     
         17 . (canceled)