Abstract: A compound condensing device to be used in an air conditioner having at least two condensing stages, one behind another, along the blowing direction of a common air blower to reduce the temperature and pressure of the refrigerant in the coiled pipe extending from the exiting end of the compressor and input end of the expanding device. In both condensing stages, coiled pipe sections are arranged in an up-and-down array, and evaporative cooling liquid droplets are distributed over the coiled pipe to extract heat from the refrigerant in the coiled pipe. Furthermore, fins and water-retaining material wrapping around the coiled pipe are used to increase the efficiency of evaporation. With the arrangement of two or more condensing stages, the exiting air from the compound condensing device has a temperature of about 28.5.degree. C.

Abstract: A multistage condensing structure using a liquid dispensing means to transfer droplets of evaporative cooling liquid onto an air-cooled condenser, taking advantage of the conventional air-cooled condensing method and the evaporation method using a liquid coolant. To further increase the efficiency of the air conditioner, two or more condensing units can be arranged in tandem along the blowing direction of a common air blower. With two or more condensing units arranged in tandem, the contacting area between the evaporation surfaces and the air flow can be enlarged to increase the evaporation efficiency without significantly increasing the size of the air conditioner. The multistage condensing structure, with its continuous heat-exchange along the flow of the refrigerant in the coiled pipe, causes an increase in the subcooling condition in the refrigerant. This condensing structure can, therefore, achieve a much higher E.E.R. than the known method of air cooling.

Abstract: A method and system to distribute evaporative cooling liquid onto a heat-exchanger in an air conditioner which uses a rotating air blower to generate a forced air flow toward the heat-exchanger. The liquid distributing system consists of a liquid dispenser fixedly mounted on the rotating axis of the air blower, a liquid supplier to provide the cooling liquid to the liquid dispenser. As the blades of the air blower are turned to provide a forced airflow, the liquid dispenser rotates along with the rotating axis of the air blower. The centrifugal force resulting from the rotating motion of the liquid dispenser causes the liquid received by the dispenser to scatter toward the heat exchanger.

Abstract: An air conditioner operating on a compressor-condenser-evaporator circuit utilizes water cooled by air flowing over an evaporative medium through which the water flows to cool a condenser coil located in a continuous serpentine channel in a sump member located at the lower side of the air conditioner unit. The condenser coils include offset intertwined upright coils that provide a large heat exchange surface with water flowing in the channel to a pump intake region of the sump. A pump is provided to supply the evaporative medium with water from the pump intake region of the sump for continuous circulation through the evaporative medium and the sump channel. A water distributor system supplies water uniformly to the top area of the evaporative medium by creating a film of water that is evenly distributed across the top of the evaporative medium.

Abstract: A heat exchange apparatus is provided with an indirect evaporative heat exchange section and a direct evaporative heat exchange section. A uniform temperature evaporative liquid is downwardly sprayed into the indirect section to indirectly exchange sensible heat with a hot fluid stream flowing within a series of enclosed circuits which comprise the indirect evaporative heat exchange section. After the evaporative fluid descends through the entire indirect heat exchange section and absorbs heat, it is distributed across fill media within the direct evaporative heat exchange section for cooling. Separate streams of ambient cooling air are simultaneously drawn into each of the heat exchange sections crosscurrently to evaporatively cool the evaporative liquid flowing within each section. The water cooled in the direct heat exchange section is then collected in a sump where it is allowed to mix and resultantly become uniform in temperature before being redistributed.

Abstract: A heat exchange unit for an air conditioning/refrigeration system includes a plurality of independent spiral coils carrying hot refrigerant. Water is sprayed onto an upper set of the coils and passes through a bank of surface media onto a lower set of coils and then into a sump where it is recirculated. Water is also sprayed onto the lower coils. Air flows upwardly though the unit and cools the downwardly moving water droplets. Although most of the cooling in the unit is from evaporation, an unusual feature is the almost complete lack of scale buildup. The unit is almost completely dark inside so algae doesn't grow. Periodic high water temperatures and periodic purging of the recirculated water minimizes fungi growth. The coils are supported in such a manner that the tubes are allowed to lengthen and expand radially when temperatures are high and shrink when temperatures are low.

Abstract: A heat exchange apparatus which can be used as an evaporative condenser, fluid cooler or wet-air cooler, is provided with a direct evaporative heat exchange section overlying an indirect evaporative heat exchange section. An air entry zone common to both heat exchange sections receives an air stream blown into this zone by at least one fan, thereby pressurizing the plenum such that the air stream is forced to split and enter each section while inside the apparatus. This eliminates the need for separate air entries, thus condensing the size and cost of the apparatus, while increasing heat exchange capacity. A countercurrent air flow pattern through the direct section provides a uniformly cooled evaporative liquid for use in the indirect section. The evaporative liquid flow is parallel to the air stream provided in the indirect section.

Abstract: An evaporative cooling system externally mounted around an air cooled condenser to increase the rate of heat transfer. Spray cooling takes place in stages around succeeding portions of the condenser as determined by thermostats which respond to increasing condenser air discharge temperature.

Abstract: This invention uses an air to air heat exchanger to cool the air passing through an evaporative water cooler. This enables the evaporative water cooler to cool water to a temperature very near to the dewpoint temperature. The water so cooled may be used to remove heat from other media. One use of the cooled water is to remove heat from a habitation. This invention provides in hot arid climates a method of cooling air inside a habitation to a temperature providing comfort to the occupants at a much lower cost and at a much lower usage of electrical energy than previous methods.

Abstract: An air conditioning system includes a compressor, a motor adapted for driving the compressor, a condenser in communication with the compressor, an expansion device, an evaporator which precipitates a condensate, and an electronic system controller. A liquid management system for the air conditioning system includes a reservoir for accumulating condensate precipitated from the evaporator and means for distributing the condensate for cooling at least one selected system component. A method of cooling an air conditioning system is also provided. The method includes capturing the condensate precipitated from the evaporator; distributing the condensate to various system components for cooling.

Abstract: A water cooling device for water purifiers is disclosed. In the above cooling device, the hot junction of a thermoelement compositely dissipate heat due to both latent heat of vaporization generated by water vaporization and air current blown by a blower fan, thereby cooling the purified water contained in the cold water tank more rapidly. The above thermoelement absorbs heat from the cold water tank at its cold junction and dissipates the heat to atmosphere at its hot junction. The above hot junction has a plurality of radiating fins which is covered with a zigzagged cooling water absorbing member saturated with cooling water. The cooling water is heated and vaporized by the heat of the hot junction thereby cooling the hot junction. The above radiating fins and zigzagged water absorbing member are clipped together by a clip unit in order to be brought into close contact with each other.

Abstract: The invention is a mist spray system for refrigeration condensers and includes a water spray nozzle centrally affixed to the condenser grill for spraying a circular pattern of water on the condenser when operating. A paddle pivotally suspended over the condenser exhaust is connected to a control arm that functions as a pinch valve controlling the flow of water to the nozzles when the paddle is activated by the flow of exhaust air. Water into the system is pressure controlled, and travels through 1/4 inch plastic tubing to the nozzles which are adjustable.

Abstract: The insertion of a specifically designed evaporative cooled supplemental condenser in a refrigeration system, working in operative relation with the air cooled condenser of the system, enhances the system operation. The objective of this evaporative type supplemental condenser is to improve the condensing capacity of the existing air cooled refrigerant condenser to the extent that its performance will counteract the detrimental effects of high ambient temperatures by supplementing the existing condenser capacity. The system's air cooled condenser will perform as the primary condenser and the supplemental condenser will correct the pressures and temperatures of the refrigerant as required, for counteracting the effects of high ambient temperature operation on air conditioning refrigeration systems.

Abstract: A housing is provided for an air conditioning condenser of the type providing a fan creating an upward path of air movement through the housing, a heat exchange coil having and inlet and an outlet for connection to a source of hot refrigerant in a refrigerant loop and means for spraying water on the coil. The housing is made of rotomolded plastic and comprises a base, a plurality of identical walls and a top. The base and top are rotocast as a single piece and then cut horizontally with a saw to provide the two pieces. The base includes a U-shaped foot arranged to receive fork lift tines and oriented so the fork lift does not damage the inlet and outlet to the heat exchange coils.

Abstract: A system for cooling and gases in which the process gas is dehumidified in a desiccant module and subsequently treated in a heat exchanger. Additional heat exchanger and gas washers may be included in the system. The system is operable in either an open or closed system to generate either cold gas or cold fluid or both. In a preferred embodiment, the heat exchanger has a dry channel in which both sensible and adiabatic gas cooling occurs and an adjacent counterflow wet channel. The desiccant may be either a liquid or solid and is regenerated.

Abstract: An engine cooling apparatus positioned between a coolant radiator and air conditioning condenser of an associated automotive vehicle, with the cooling apparatus including a plurality of nozzle members between the condenser and radiator structure, with a fluid control operative through a control relay to effect actuation of a pump to direct fluid flow to the nozzle members upon sensing a predetermined coolant temperature within the radiator.

Abstract: A heat exchange apparatus is provided with an indirect evaporative heat exchange section and a direct evaporative heat exchange section. A uniform temperature evaporative liquid is downwardly sprayed into the indirect section to indirectly exchange sensible heat with a hot fluid stream flowing within a series of enclosed circuits which comprise the indirect evaporative heat exchange section. After the evaporative fluid descends through the entire indirect heat exchange section and absorbs heat, it is distributed across fill media within the direct evaporative heat exchange section for cooling. Separate streams of ambient cooling air are simultaneously drawn into each of the heat exchange sections to evaporatively cool the evaporative liquid flowing within each section. The water cooled in the direct heat exchange section is then collected in a sump where it is allowed to mix and resultantly become uniform in temperature before being redistributed.

Abstract: Disclosed is a method for reducing the temperature of the air passing over the condenser surface of an air conditioner unit, thereby reducing the power requirements of the unit. The method is carried out by applying water to the condenser surface to achieve coverage of substantially the entire outside surface and the entire inside surface of the condenser with water while the unit is operating. The amount of water applied should be sufficient to wet substantially the entire inside and outside surface of the condenser. The water can be applied from a tubing having a plurality of passages opening through its sidewall at generally linearly spaced apart positions. An adjustable valve means can be positioned near the inlet end of the tubing to regulate water flow through the tubing. An electrically actuated on-off valve can be operatively connected to the tubing between the adjustable valve and the passages so that water will flow only when the compressor is operating.

Abstract: A fluid cooler having contiguous air cooled and evaporative portions and having a heat exchanger common to both portions. The heat exchanger employs a series of straight tubes which traverse both the air-cooled and the evaporative portions. Separate fans are provided for the air-cooled and for the evaporative portions. The segments of the straight tube laying within the air-cooled portion are finned. The segments of straight tubes laying within the evaporative portion are partially finned and extend further downwards as a sub-cooling section of the evaporative coil portion, thereby providing means for cooling the fluid to a temperature lower than ambient dry-bulb temperature.

Abstract: An improved water cooled air conditioner having a compressor, an evaporator, a cooling fan, a low pressure pipe, a high pressure pipe, a radiator, a cooling motor, and a condenser is provided. The apparatus is characterized in that the heat exchanging efficiency between the cooling water and the refrigerant is highly enhanced thereby intensifying the cooling effect and increasing the temperature of the cooling water flowing out of the apparatus to an acceptable degree for use as residential hot water. Further, the heated water from the radiator may be sprayed on to the external surface of the radiator to provide evaporative cooling thereof.

Abstract: A refrigeration system is disclosed having first stage and second stage compressors, first stage and second stage evaporator coils, and first stage and second stage condenser coils, each connected together to form first stage and second stage closed loop refrigeration circuits. The two circuits are coupled one to the other by a liquid (water, ethylene glycol of other good heat transfer medium) heat transfer loop which interconnects the second stage evaporator and the first stage condenser to transfer heat from the first stage condenser to the second stage evaporator. A plurality of additional refrigeration circuits may be provided, each including a compressor, an evaporator coil and a condenser coil connected together in a closed loop.

Abstract: A self-contained air conditioner unit comprises an enclosure including a first and second intake apertures positioned to communicate with outside ambient air and first, second, and third outlet apertures positioned to communicate with a habitable space in which the air conditioner is placed. A water reservoir is disposed at the bottom of the enclosure. A two-section heat exchanger is disposed in the cabinet over the water reservoir, each section comprising a plurality of vertically disposed, alternating wet air channels and dry air channels defined by substantially parallel opposing heat-transfer partitions. The first-section dry-air channels communicate with a pre-mixing chamber at intake ends thereof and an air-distributing chamber at outlet ends thereof. Each first-section wet channel communicates with the distributing chamber at intake ends thereof and the second outlet aperture at outlet ends thereof.

Abstract: An evaporative humidification unit of modular construction readily adapted for assembly in selected configurations is provided. The configuration or array required for a particular installation is determined, and a supporting framework for the configuration is assembled from a selection of standardized structural components. The framework defines an array of compartments for basket or container units containing discrete, randomly-oriented flow-diffusing packing elements. The front and rear faces and floor of the basket units are mesh covered whereby air may be drawn transversely through the mass of diffusing elements while water is flowing downwardly therethrough. Spray units are positioned above the baskets for spraying water onto the mass of diffusing elements, and a collection pan is located beneath each basket for collecting and carrying away water which flows downwardly through the mass.

Abstract: An air conditioner housing employs a fluid manifold operative through a support rod and lift cup to effect fluid flow through an associated fluid valve into the manifold to effect fogging mist of the fluid to be directed upon the condenser coils to enhance cooling efficiency of the air conditioner unit in use.

Abstract: A system for controlling the temperature of the interior of a vehicle, e.g., a railway carriage, comprising a refrigerant circuit (18) having an evaporator (21) through which air is passed to outlets (24) to the interior of the vehicle. A condenser (25) of the refrigerant circuit (18) is cooled by liquid-containing pipes which extend over the entire height of the vehicle to a liquid/air heat exchanger (19). The refrigerant unit is arranged in or on the roof of the vehicle and heat exchanger (19) is arranged on or under the floor of the vehicle, or vice versa.

Abstract: An air cooler system for use in association with an air circulation system and having a process air heat exchanger for recovering heat from the process air in the system, a vacuum chamber with a vacuum chamber heat exchanger in communication with the process air heat exchanger so as to transfer heat from process air heat exchanger to the vacuum chamber heat exchanger, a water supply for supplying water to the vacuum chamber and, vacuum source to draw a predetermined degree of vacuum in the vacuum chamber so as to reduce the boiling point of water therein.

Abstract: Heat exchange apparatus for food freezer refrigeration units including evaporator coils having liquid santizing spray apparatus mounted for reciprocatory movement across the upstream and downstream faces of the evaporator coils.

Abstract: A portable air conditioning apparatus includes a refrigerating circuit comprising a variable capacity compressor and a condenser cooled by water fed from a water tank and a flow of air generated by a fan device, an inverter for outputting a variable driving frequency to the compressor, and a control section for controlling the frequency of the inverter in response to an air conditioning load in a defined space. The control section has a frequency control function by which the driving frequency of the inverter is forcibly decreased irrespective of the air conditioning load to reduce the consumption of water at the condenser when an amount of water is detected to be below a prescribed value in the water tank.

Abstract: A system for controlling the operation of an HVAC system which includes a direct expansion coil, a condenser, a pre-cool coil, and a control system. The control system includes a controller and sensors. The controller receives signals indicative of air flow through the direct expansion coil from the sensors, compares the received signal to a stored air flow rate, and disables the compressor if the stored air flow rate is equal to or greater than the stored value. The controller is also adapted to vary air flow into an occupied space for small changes in the cooling load. In addition, the controller can artificially load the compressor during periods of small cooling load by restricting flow of a cooling agent between the cooling tower and the condenser, or by directing warm water from the condenser through the pre-coil coil.

Abstract: An air conditioner comprises a compressor for compressing and circulating a coolant in the cooling circuit, a condenser of the air cooling type for cooling and condensing the compressed coolant, a condenser of the water cooling type for further cooling and condensing the coolant which has been condensed by the air cooling condenser, and two independent air passages through which air is supplied to both of the air and water cooling condensers, respectively.

Abstract: A refrigeration system including a compressor, condenser and evaporator utilizes an evaporative subcooler downstream of the condenser for subcooling the refrigerant for increased system efficiency. The strategic placement of the subcooler for cooling in the liquid zone allows the operating pressure and temperature of the refrigeration system to be reduced and the refrigerant in the system to provide the greatest cooling effect in the evaporator. As an additional feature, a counterflow heat exchanger is provided in the liquid zone adjacent the subcooler in order to provide additional subcooling and also provide for warming of the cooling water used for evaporative cooling. The subcooler can be readily used as a retrofit in an existing system and is particularly adapted for increasing efficiency in high capacity use situations, such as in the food industry. Preferably, condensate water is used for cooling in the evaporative subcooler, but tap water is used for makeup cooling water.

Abstract: A portable air conditioning apparatus includes a refrigerating circuit comprising a variable capacity compressor and a condenser cooled by water fed from a water tank and a flow of air generated by a fan device, an inverter for outputing a variable driving frequency to the compressor, and a control section for controlling the frequency of the inverter in response to an air conditioning load in a defined space. The control section has a frequency control function by which the driving frequency of the inverter is forcibly decreased irrespective of the air conditioning load to reduce the consumption of water at the condenser when an amount of water is detected to be below a prescribed value in the water tank.

Abstract: A heat exchanger is constructed from a heat-conductive metal foil wound backwards and forwards in sinuous fashion to provide a stack of parallel pockets (1) between neighboring sections (8) of the foil. The pockets (1) contain baffles (5,6) which guide fluid flowing through the pockets to follow a serpentine path of U, S or M shape. The serpentine path in all the pockets is substantially the same shape but the direction of fluid flow (13) in alternate pockets is opposite to the flow direction (14) in the remaining pockets. Two corner regions of the pocket stack are each provided with two manifolds (15,16) one of which communicates with the alternate pockets (1) and the other manifold communicates with the remaining pockets (16). The pockets may be formed from a signal foil or from two or more foils. The manifolds may be arranged on diagonally opposite, or on adjacent corner regions of the stack.

Abstract: The apparatus for creating a reduced temperature air surround about a refrigeration type air conditioner. The reduced temperature air surround is interposed between the air conditioner and the environment, ambient temperature air surround. The apparatus for creating the reduced temperature air surround is a water cooling system having mist-spray heads for ejecting a fine particulate water mist into the air surrounding the air conditioner. A valve actuates the mist-spray heads only at those times at which the air conditioner fan is actuated to draw air from the immediate vicinity of the air conditioner and pass that air over the condenser coils of the air conditioner.

Abstract: A refrigeration system including a compressor, condenser and evaporator utilizes an evaporative subcooler downstream of the condenser for subcooling the refrigerant for increased system efficiency. The strategic placement of the subcooler for cooling in the liquid zone allows the operating pressure and temperature of the refrigeration system to be reduced and the refrigerant in the system to provide the greatest cooling effect in the evaporator. As an additional feature, a counterflow heat exchanger is provided in the liquid zone adjacent the subcooler in order to provide additional subcooling and also provide for warming of the cooling water used for evaporative cooling. The subcooler can be readily used as a retrofit in an existing system and is particularly adapted for increasing efficiency in high capacity use situations, such as in the food industry. Preferably, condensate water is used for cooling in the evaporative subcooler, but tap water is used for makeup cooling water.

Abstract: An external water supply tank having a relatively large water storage capacity fixed to the outside of a portable air conditioning apparatus to supply water to a spray device disposed in the air conditioning apparatus for cooling a condenser subject to generation of heat.

Abstract: An evaporative condenser having a cylindrical fiberglass housing which provides a circumferential air flow across a plurality of concentrically oriented spiral condensing coils. The planar spiral coils are generated through the compression of a conical winding of tubing formed about a multi-tiered platform, to form an evenly-spaced spiral condensing coil. Each layer of tubing is affixed to a plurality of radial braces, which provide the evaporative coils with sufficient structural integrity to be individually employed. A method and apparatus for producing spiral coils having uniform spacing between adjacent revolutions.

Abstract: There is disclosed a new and improved cooling system and method for cooling the air in an enclosed space. The cooling system includes a cooling tower having a plurality of fans arranged to cool a first fluid and a chiller including a condenser thermally coupled to the first fluid, a compressor, and an evaporator. The chiller further includes first conduit means for carrying a refrigerant. A chilled fluid loop including second conduit means circulates a second fluid through the evaporator for cooling the second fluid and is arranged to flow air over the second conduit means and into the enclosed space for cooling the air in the enclosed space. Fan control means controls the speed of the cooling tower fans to minimize the total power consumption of the fan motors and the compressor.

Abstract: A tower, or vertical shaft, equipped with a two stage evaporative cooler near the top. The chimney effect, in reverse, causes the cool air to flow by gravity down the tower. The air can be used for cooling and ventilating structures. In one embodiment of the invention, the ambient air flow is all that is required for the embodiment to operate and all reliance upon electrical energy is eliminated.

Abstract: A residential-type hybrid air conditioning system having a conventional refrigeration subsystem which handles system sensible heat loads and a liquid desiccant dehumidification subsystem which handles system latent heat loads additionally incorporates an evaporative cooler which cooperates with and receives heat from the dehumidification subsystem to increase the performance efficiency of the total system.

Abstract: A precooler for enhancing the cooling effectiveness and efficiency of an existing evaporative cooling system employing a misting system for precooling the ambient air before entering the air flow inlet to the evaporative cooler.

Abstract: An evaporative condenser cools and condenses fluid, such as refrigerants in a refrigeration system, by circulating the fluid through a condensing coil, continuously and completely spraying the condensing coil from above with cooling water, and simultaneously blowing air from below the condensing coil upwardly and counter to the cooling water. Heat is transferred from the fluid to the cooling water, and heat is transferred by evaporation from the cooling water to the air and is discharged to the atmosphere. A fogging nozzle sprays a fine water mist into the air blowing into and through the condenser, which will increase the rate of evaporation and therefore increase the rate of heat transfer, thus increasing the cooling efficiency of the condenser.

Abstract: An evaporative precooling unit for use with a conventional refrigerant type air-conditioning system having an exteriorly mounted compressor housing including a compressor, a condenser, a side air inlet, a top air outlet and a fan for directing air through the side air inlet and out the top air outlet to cool the compressor and condenser, includes a precooler housing dimensioned to be installed over the side air inlet of the compressor housing. The precooler housing may utilize either water saturated pads or spray nozzles to provide evaporative cooling to the air entering the compressor housing. In an alternative embodiment, a precooler housing having a bottom cooled air outlet dimensioned for registry with the top air outlet of the compressor housing is utilized to supply cooled air to the compressor and condenser upon reversal of the compressor cooling fan blades.

Abstract: A regenerative fresh-air air conditioning system moves ingoing and outgoing air through a building structure and includes an ingoing air portion wherein the ingoing air is filtered and then pre-cooled by a pre-cooling heat pipe. The ingoing air is then moved by a blower to an evaporator where the air is further cooled and a resulting condensate forms. The cooled air is then supplied to the building by a supply register. Outgoing air passes across a wet heat pipe which is wetted by the condensate from the evaporator and may also be wetted by condensate from the pre-cooling heat pipe. The outgoing air is then sub-cooled and mixed with fresh air by a fan which moves the mixed fresh and outgoing air across a condenser and exhausts the mixed air from the building structure.

Abstract: Condenser for compressed refrigerant gas or vapor from a compressor comprising a heat exchanger and evaporative cooling means, with the heat exchanger having two relatively parallel walls each of which has an outer surface, at least one of said walls being heat conductive, an inlet for receiving compressed refrigerant from the compressor, an outlet for delivering cooled compressed refrigerant to an evaporator, and a conduit connecting the inlet and outlet for the flow of compressed refrigerant therethrough, the conduit being between the two walls and parallel to the outer surfaces thereof, and with the evaporative cooling means for cooling the outer surface of the heat conductive wall as compressed refrigerant flows through the conduit.

Abstract: The apparatus for conditioning the air in a room comprises a frame (2) supporting means (3) for compressing a fluid, means (4) for its condensation and means (5) for its evaporation and means (6) for cooling the condensing means; the condensing means comprise at least one first condenser (7) for the air-cooling of the liquid and at least one second condenser (8) for the water-cooling thereof.

Abstract: An air conditioner includes an inside air cleaner provided in a front portion of the air conditioner for cleaning air inside a room circulated through the evaporator, and an outside air dust remover provided in a rear portion of the conditioner for precluding the entrance of dust laden in the air into the rear portion of the conditioner and for washing the condenser by spraying condensate water onto the condenser as collected from the conditioner bottom plate.

Abstract: An air conditioner comprises a water distributor having an opening on its bottom plate, dams around the opening and inverted U-shaped members with a small space formed between the inverted U-shaped plates and the dams so that water in the distributor is guided by a capillary action and distributed to an indoor heat exchanger. A reservoir is disposed to a pipe system between a pump and the indoor heat exchanger so that drain water in the outdoor drain pan is directed to the indoor heat exchanger through the reservoir. The reservoir has a tube which permits excessive water to spill over an opening of the tube to return to the outdoor drain pan through a returning conduit pipe.

Abstract: The present invention discloses an apparatus for monitoring the level of a liquid such as water in a reservoir of a water cooling tower or the like wherein it is required to maintain a predetermined desired liquid level and for generating a first control signal for controlling the addition of make-up liquid to the reservoir and a second control signal for terminating the addition of liquid to the reservoir. The apparatus includes a float chamber having it bottom coupled to the reservoir for equalizing the water levels therebetween. A float is positioned within the float chamber for rising and falling with the level of monitored liquid therein. A float rod extends vertically upward from a central portion the float for movement therewith. A lever housing is fixedly secured in an intermediate position within the float chamber, and the lever housing pivotally mounts a lever member therein. The lever member has a long lever arm and a short lever arm.

Abstract: An evaporative cooling system is disclosed which uses a heat pipe device comprising first and second heat exchangers to transfer heat from the space being cooled to an evaporative cooler. Evaporative cooling is produced by passing atmospheric air over wet pads and the first heat exchanger. Evaporation of water removes heat from the atmospheric air and from the first heat exchanger containing refrigerant vapor, causing condensation of a portion of the vapor. The condensate moves to the second heat exchanger which contains liquid refrigerant. Room air is passed through the second heat exchanger and gives up heat to vaporize the liquid refrigerant. Vaporized refrigerant moves to the first heat exchanger where it is condensed as previously described. The cooled atmospheric air is then used to cool the condenser of a vapor compression machine, the evaporator of which is located in the flow path of the room air downstream of the heat pipe, further cooling the room air to desired conditions.