Abstract: A heat exchange system comprises vertical centermost plenum surrounded by the heat exchange coil and housed in a plurality of side panels and a base, the plurality of side panels have air intakes that communicate outside air into the cabinet above the heat exchange coil and sprayers, a stream of spray water and air is drawn downwardly over a heat exchange coil, a portion of the spray water is separated from the air by drawing the air inward to the plenum, the air is then drawn upwardly within the plenum to an exhaust external to the enclosure.

Abstract: A heat exchange system comprises vertical centermost plenum surrounded by the heat exchange coil and housed in a plurality of side panels and a base, the plurality of side panels have air intakes that communicate outside air into the cabinet above the heat exchange coil and sprayers, a stream of spray water and air is drawn downwardly over a heat exchange coil, a portion of the spray water is separated from the air by drawing the air inward to the plenum, the air is then drawn upwardly within the plenum to an exhaust external to the enclosure.

Abstract: Coil assemblies for use in heat exchange applications are made using polymeric tubes, some with heat exchange and water redistribution media integral with the coil assembly and others with a water distribution subassembly integral with the coil assembly. One coil assembly includes at least two generally linear passes that are connected by return bends formed by folding an array of polymeric tubes. The passes have an array of at least two layers of polymeric tubes that pass through alignment holes in tube spacers only along the passes to maintain the tubes in substantially the same relative positional relationship to each other in the passes and in the return bends. Methods are explained for forming the coil assemblies and components, including the tube spacers and tube sheets to connect the coil assembly to inlet and outlet manifolds for the processing fluid flowing internally through the tubes.

Abstract: A heat exchange system adapted to selectively operate in wet mode, dry mode, or both wet and dry mode comprises a plurality of layers of tube arrays arranged in a folded serpentine or stacked relationship such that fluid passes through each layer in a generally lateral manner, through a layer transition portion that conveys fluid to a lower layer of tube arrays existing at a lower elevation, one or more spray nozzles are located above an array of tubing and adapted to spray fluid onto the one or more arrays of tubing located below, and at least one fluid router is configured to convey process fluid only into the arrays of tubing in dry mode, only to the spray nozzles in wet mode, or to both into the arrays of tubing and to the spray nozzles.

Abstract: Coil assemblies for use in heat exchange applications are made using polymeric tubes, some with heat exchange and water redistribution media integral with the coil assembly and others with a water distribution subassembly integral with the coil assembly. One coil assembly includes at least two generally linear passes that are connected by return bends formed by folding an array of polymeric tubes. The passes have an array of at least two layers of polymeric tubes that pass through alignment holes in tube spacers only along the passes to maintain the tubes in substantially the same relative positional relationship to each other in the passes and in the return bends. Methods are explained for forming the coil assemblies and components, including the tube spacers and tube sheets to connect the coil assembly to inlet and outlet manifolds for the processing fluid flowing internally through the tubes.

Abstract: A heat exchanger including a housing having a base and defining an interior. A plurality of coils are located in the interior of the housing and are arranged to extend upwardly from the base to define a coil depth. A blower is adapted to move air through the plurality of coils in a direction of the coil depth. A water distribution system is preferably located around a circumferential periphery of the plurality of coils to spray water on an outer surface of the plurality of coils along substantially the entire coil depth thereof. At least one air inlet opening is located in the housing to allow airflow across the plurality of coils. Additional embodiments of improved heat exchangers are disclosed herein.

Abstract: A heat exchanger including a housing having a base and defining an interior. A plurality of coils are located in the interior of the housing and are arranged to extend upwardly from the base to define a coil depth. A blower is adapted to move air through the plurality of coils in a direction of the coil depth. A water distribution system is preferably located around a circumferential periphery of the plurality of coils to spray water on an outer surface of the plurality of coils along substantially the entire coil depth thereof. At least one air inlet opening is located in the housing to allow airflow across the plurality of coils. Additional embodiments of improved heat exchangers are disclosed herein.

Abstract: A multiple-compressor refrigeration system for use in commercial refrigeration applications includes a plurality of compressors of unequal refrigeration capacity connected in a refrigeration circuit that includes a condenser and a plurality of associated evaporators and expansion devices in remotely located refrigerated enclosures. A system controller is connected to a pressure responsive transducer that measures the suction pressure of the system and compares the so-measured suction pressure to a desired suction pressure and selects one of a plurality of 2.sup.n available compressor operating states in accordance with the measured difference. The system advantageously increases overall system efficiency by providing increments or decrements of compressor capacity that are more precisely matched to system load changes as compared to prior multiple-compressor systems.