Abstract:
The efficiency of home external condenser units is improved by cooling ambient air by a water mist, preferably formed about 12 inches away from the condenser unit. Mist-forming nozzles or heads are mounted on the condenser unit housing and coupled to a water supply (spigot) via a solenoid valve coupled to the thermostat control circuit for the condenser unit.

Description:
REFERENCE TO RELATED APPLICATION 
     This application is based on my provisional application Ser. No. 60/111,275 filed Dec. 7, 1998 entitled H 2 0 MIST KIT FOR HOME EXTERNAL CONDENSER UNITS. 
    
    
     BACKGROUND AND BRIEF DESCRIPTION OF THE INVENTION 
     Residential or home air conditioners include an external condenser unit having a coil wherein a refrigerant is circulated through the coil for heat exchange purposes. During operation, the coils are cooled by a fan which draws external air over the condenser coil. 
     There have been numerous attempts in the past to use water to cool condenser coils to thereby enhance the efficiency. See the following patents: 
     
       
         
               
               
             
           
               
                   
               
               
                 Patent No. 
                 Inventor and Title 
               
               
                   
               
             
             
               
                 2,278,242 
                 Chapman 
               
               
                   
                 For: EVAPORATIVE COOLER 
               
               
                 4,028,906 
                 Gingold et al 
               
               
                   
                 For: FOGGING DEVICE FOR COOLING A 
               
               
                   
                 CONDENSER COIL 
               
               
                 4,170,117 
                 Faxon 
               
               
                   
                 For: MIST SPRAY APPARATUS FOR AIR 
               
               
                   
                 CONDITIONER CONDENSER 
               
               
                 4,240,265 
                 Faxon 
               
               
                   
                 For: MIST SPRAY APPARATUS FOR AIR 
               
               
                   
                 CONDITIONER CONDENSER 
               
               
                 4,274,266 
                 Shires 
               
               
                   
                 For: WATER COOLING SYSTEM FOR AIR COOLED 
               
               
                   
                 AIR CONDITIONERS 
               
               
                 5,003,789 
                 Gaona 
               
               
                   
                 For: MIST AIR CONDITIONER FOR EVAPORATIVE 
               
               
                   
                 COOLER 
               
               
                 4,542,627 
                 Welker 
               
               
                   
                 For: COOLING APPARATUS FOR AIR CONDITIONER 
               
               
                   
                 AND REFRIGERATION SYSTEMS 
               
               
                 4,685,308 
                 Welker 
               
               
                   
                 For: TEMPERATURE RESPONSIVE COOLING 
               
               
                   
                 APPARATUS 
               
               
                 5,117,644 
                 Fought 
               
               
                   
                 For: CONDENSER COIL COOLING APPARATUS 
               
               
                 5,285,651 
                 Marine 
               
               
                   
                 For: AIR CONDITIONER COOLING APPARATUS 
               
               
                 5,311,747 
                 Pringle et al 
               
               
                   
                 For: WATER-ASSISTED CONDENSER COOLER 
               
               
                 5,605,052 
                 Middleton et al 
               
               
                   
                 For: MIST SPRAY SYSTEM FOR REFRIGERATION 
               
               
                   
                 CONDENSERS 
               
               
                   
               
             
          
         
       
     
     For the most part, these units are not satisfactory because some unduly block airflow and/or they tend to cause excessive rusting of the condenser coils and the associated hardware in the external condenser unit. 
     The object of this invention is to provide an improved method and apparatus for misting home external condenser units which does not cause excessive rusting and is more efficient and less costly and is easy to install. 
     According to the present invention, a fine spray mist is formed in the airflow stream about twelve inches up-stream or spaced away from the condenser unit so as to cool the air being drawn into the condenser unit. This cooled air allows the fluid in the condensing unit to change state much easier and faster. On very hot summer days, the present invention removes some super heat from the air and lowers the suction pressure; for instance, by removing this extreme heat when the temperature is in the high 90&#39;s and the heat index is 110° or above. The flash gases returning on the suction side of the condenser can condense back to liquid form much easier thus lowering the current drawn by the condensing unit and the air conditioning unit plus reduce running time on the condensing unit and also on days which have extreme heat will allow the unit to cycle on and off in synchronism with the thermostat. 
     Moreover, by making the water spray in the form of a mist, less water is required because of the size of the spray heads and this is the only time the water is being used, e.g. when the thermostat calls for cooling. Because the water is in the form of a cloud or mist, there is less tendency for water to collect in the condenser unit so that the condenser unit does not rust out. In other words, no pool of water or water droplets are retained within the condensing unit. 
     If the heating unit has a heat pump and underground wiring going to a coil on the solenoid valve, for installation unscrew the water line at the spigot where the water supply was picked up and attach the one-quarter inch outside dimension plastic tubing. Before starting up in the spring, it is preferable that the spray orifice be washed in warm soapy or soda water to remove encrustation and the like and then rub a little Vaseline® (petroleum jelly) on the rubber orifice and screw them back into the three tees. Hook up the ground wire and this prepares the unit to be ready for next Spring. 
     It must be remembered that the invention is not sucking or drawing water through the condensing unit. The mist generated by the spray orifices just cools the air down to make the heat exchange process more efficient, and this is the process which makes the unit operate exceptionally well. 
    
    
     DESCRIPTION OF THE DRAWINGS 
     The above and other objects, advantages and features of the invention will become more clear when considered with the following specification and accompanying drawings, wherein: 
     FIG. 1 is an isometric perspective view of a home external condensing unit incorporating the invention; 
     FIG. 2 is a functional block diagram of the misting system shown in FIG. 1; and 
     FIGS. 3A-3K are pictorial depictions of component parts of the invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The basic objective of the invention is to improve the efficiency of home air-conditioning external condensing units by cooling the air drawn through the unit. As shown in FIG. 2, a source of water, such as an outside spigot  10  has a fitment  11  attached to serve as the source of water. Plastic tubing (¼″) connects the source of water to a solenoid valve  12  which has an operating coil  12 OC which is electrically connected with thermostat controls in the house by way of the service panel on the external condenser (see FIG.  1 ). An in-line filter (see FIG. 3H) may be included in the water line to the valve  12 . The water from valve  12  is coupled by ¼″ tubing to a plurality of mist forming nozzles  15 . As shown in FIG. 1, the air cooling mist is formed about twelve inches away from or upstream of the condensing unit and cools the air prior to the air entering the condensing unit. 
     All the items that come with the H 2 O Kit for the user to hook up and be ready in about 30 minutes are as follows: 
     1. At least three spray orifices. 
     2. Twenty-five foot roll of ¼″ outside dimension plastic tubing. 
     3. Three plastic tees. 
     4. Three clamps for mounting water line as shown. 
     5. Water solenoid with ferrule shown on illustration ( 18 ) V-sealed unit. 
     6. 115 V sealed coil. 
     7. A diagram on “How to Install Complete Kit”. 
     Also in kit will show the owner where to place plastic tees that mount the spray heads and orifices and end cap as needed. 
     Part Number Function 
     1A Air that has passed through the condensing unit. 
     2B Air that has passed through the cloud created by installing the invention (H 2 O mist kit). Air now has dropped from about 115° F. on heat index to about 85° F. 
     3C This band runs around all three sides of the condenser. 
     4D This panel is removed for installing #18V checking freon pressure at service valves to see once the kit is installed you might have to add a little more freon to bring super heat up—use gauges for pressure reading and amp probe for measuring amps. 
     5E Actual outdoor heat index. 
     6F Output air outside in shade is 115° F. 
     7G This is where the water line runs in and out by service valves. The opening for the refrigeration lines are large enough to run the outside dimensions of plastic tubing that comes in the kit. 
     8H This shows how the 30° difference in temperature takes place due to air passing through the cloud mist. 
     9I This is the air temperature once it has completed entry through cloud mist formed by spray orifices and is ready for entry into the condensing unit. 
     10J Shows the 25′ roll of plastic tubing that also comes with kit. (FIG. 3A) 
     11K Shows three angles of how the water line is held in place and the alligator clip to mount to condensing unit. (FIG. 3B) 
     12L This is a plastic ferule and lock nut used to hook water line up after the valve is open. (FIG. 3C) 
     13M This shows the owner how the spray header screws into the plastic so it can be unscrewed and cleaned and remounted in case of calcium build-up. (FIG. 3D) 
     14N Shows the rubber seal around spray orifice (head on). (FIG. 3E) 
     15O This shows a side view. It can be seen what screws into the tee and also the threads on the brass for removal or for tightening up spray orifice. (FIG. 3F) 
     16P This shows a connector, if the 25′ roll of tubing is not enough, how you can add on by extending the length of the tubing (comes in plastic or brass). (FIG. 3G) 
     17Q This is an in-line filter you can buy at your hardware store if your water is really hard water (like from a well). (FIG. 3H) 
     18R Shows a magnetic water valve and a 115V coil as unit that operates off the air conditioning thermostat. One side of line voltage will go to back side of contactor when the thermostat calls for cooling, then other side of line will be picked up from the ground wire run to the unit. (FIG. 3I) 
     19S This shows that you can hook up this to your spigot for water supply and water your lawn at the same time. It comes with a water cut-off for both sides of supply. (FIGS. J and K) 
     While the invention has been described in relation to preferred embodiments of the invention, it will be appreciated that other embodiments, adaptations and modifications of the invention will be apparent to those skilled in the art.