Abstract: A cooling system for a heat source includes a heat source loop, a refrigerant loop, and a controller. The heat source loop provides a closed fluid path for a process fluid and fluidly connects a valve, a bypass leg and/or a heat exchange leg having a heat exchanger, and a pump. The process fluid is disposed within a portion of the loop and is subject to heat transfer from the heat source. The valve is disposed downstream of the heat source portion of the loop, wherein the valve is selectively operable to direct process fluid to the bypass leg and/or the heat exchanger leg. The refrigerant loop provides a closed fluid path for a fluid refrigerant and fluidly connects the heat exchanger, a refrigerant compressor, a refrigerant condenser, and a refrigerant regulator. The controller is in communication with the valve and is adapted to control the valve to regulate an amount of process fluid entering the bypass leg and the heat exchanger leg.

Abstract: An evaporator unit for use in the air conditioning system of a mass transit vehicle that includes a housing mounted inside the air conditioned section of the vehicle having a return air inlet connected to a supply air outlet by a flow passage. The evaporator coil of the air conditioner is mounted in the flow passage to cool the air moving through the passage. A heater coil is mounted behind the evaporator coil to selectively heat the air moving through the passage. A dehumidifying coil is mounted in front of the evaporator coil that utilizes ambient air to dehumidify the indoor air when the ambient air temperature is at a temperature below that at which the air conditioner cannot reliably operate.

Abstract: An air conditioning module having all the necessary components for conditioning air, is so sized and arranged that, when placed in an internal compartment of a bus, has its respective openings register with an existing return air duct and a supply air duct on the bus. The compartments and modules are so arranged that they can be paired in back-to-back relationship, with one on each said of a longitudinal center line of the bus. Each of the modules has an intermediate partition dividing the module into an upper evaporator section and a lower condensing section. A mixer flap is placed in an intermediate position with respect to the partition such that its position may be selectively adjusted to thereby vary the amount of fresh air and return air that is passed through the condenser coil and evaporator coil, respectively.

Abstract: An evaporator unit for use in the air conditioning system of a mass transit vehicle that includes a housing mounted inside the air conditioned section of the vehicle having a return air inlet connected to a supply air outlet by a flow passage. The evaporator coil of the air conditioner is mounted in the flow passage to cool the air moving through the passage. A heater coil is mounted behind the evaporator coil to selectively heat the air moving through the passage. A dehumidifying coil is mounted in front of the evaporator coil that utilizes ambient air to dehumidify the indoor air when the ambient air temperature is at a temperature below that at which the air conditioner cannot reliably operate.

Abstract: A heat exchanger of the plate fin and tube type which comprises two longitudinally extending sections. The two sections each have a planar cross section and form a continuous length. The sections are bent relative to one another with the planar cross sections of the two sections forming an angular relationship therebetween in two different planes. In a preferred embodiment, a further bend is made thereby forming a third longitudinally extending section.

Abstract: A low profile room air conditioner. The low profile is achieved in part by the arrangement of components in its outside section. The fan that moves air through the outside section is of the axial flow type mounted so that its axis of rotation is substantially perpendicular to the base of the enclosure and so that the fan draws air into the outside section through the top of the enclosure. Air discharges from the outside section through an air discharge on a side of the enclosure. Louvers at the air discharge direct the air exiting the enclosure away from the air inlet. A slinger directs droplets of condensate drained from the inside refrigerant-to-air heat exchanger into the air flowing through the outside section. The air carries the condensate on to the outside refrigerant-to-air heat exchanger where it evaporates. The air flow carries the resultant water vapor out of the outside section.

Abstract: A refrigeration expansion valve meters the flow of refrigerant therethrough through a flexible orifice that varies in cross sectional area as a function of the pressure differential across the valve. The flexible orifice is provided in a tubular elastomeric element that is supported at opposite ends by rigid support means. A rigid spacer means is provided for engaging the support means to prevent the pressure differential of the refrigeration system from exerting an axial force on the flexible flow metering element.

Abstract: A refrigerant expansion valve meters the flow of refrigerant therethrough through a flexible orifice that increases in cross sectional area as the pressure differential across the valve increases.

Abstract: A mechanical refrigerant expansion valve meters the flow of refrigerant therethrough in one direction through an orifice that varies in cross-sectional area as a function of the pressure differential across the valve. The same valve controls refrigerant flow in the other direction through a fixed area metering orifice.

Abstract: A flow metering device for use as an expansion valve in a heat pump system includes a body having a flow passage extending therethrough. Two pistons are moveably disposed within the flow passage. Each piston has a flow metering port extending therethrough and a bypass flow means associated therewith. A refrigerant metering rod is fixed within the flow passage and extends through both metering ports. The rod has two flow metering configurations formed thereupon, each of which cooperates with one of the pistons to define a variable area flow passage within the valve. The pistons are spring biased to closed positions when there is no flow through the valve. Flow in one direction results in metering through the variable area passage defined by one piston and its associated flow configuration and free flow through the bypass means of the other piston. Flow through the valve in the opposite direction reverses the roles of the pistons.

Abstract: A refrigeration expansion valve meters the flow of refrigerant therethrough through a flexible orifice that varies in cross-sectional area as a function of the pressure differential across the valve.

Abstract: A refrigerant expansion device for use in a refrigeration system includes a body having a flow passage extending therethrough. A piston having a flow metering port therethrough is moveably mounted within the flow passage. A flow metering rod is supported within the housing and extends through the flow metering port. The flow metering rod and the flow metering port cooperate to define a flow metering passage between them. The flow metering rod is configured so that the cross sectional area of the metering passage varies relative to the axial position of the piston with respect to the rod. The piston is spring biased and the piston moves relative to the rod as a function of the pressure differential across the piston.

Abstract: A closed refrigeration system is provided with a mass flow limiting device located upstream of the suction inlet of a compressor. The device limits the mass flow supplied to the compressor during pulldown and startup to prevent overloading the motor or engine driving the compressor but has minimal influence on the refrigeration system under equilibrium conditions since it is designed for the specific system parameters.

Abstract: A refrigerant flow metering device which varies the expansion area of the device in response to the differential pressure between refrigerant in the high and low pressure sides of a refrigerant system. The expansion device includes a housing with a flow passage extending therethrough which is divided into a high pressure portion and low pressure portion by a partition. The partition has a flow metering port which extends therethrough and interconnects the high and low pressure portions. An elongated member extends through the flow metering port and cooperates with the flow metering port to define a refrigerant flow metering passageway therebetween. The elongated member is configured to vary the cross-sectional area of the flow metering passage in relation to the position of the elongated member to the flow metering port.

Abstract: A refrigerant flow metering device for use in a refrigeration system includes a housing having a flow metering passage extending therethrough. A partition is located within the flow passage of the housing and defines a flow metering port therethrough. The partition divides the flow passage into a high pressure and a low pressure portion. An elongated member extends into the metering port. The elongated member and the metering port cooperate to define a flow metering passage therebetween. The elongated member is configured to vary the cross-sectional area of the flow metering passage in relation to the position of the elongated member to the flow metering port. One end of the elongated rod extends into the low pressure portion of the flow passage.

Abstract: A support base for a polygon shaped cabinet of an indoor fan coil unit. The base is molded of high density non-metallic material, and holds the cabinet during assembly, shipment, and installation of the unit. The base has an indentation in its top, which is the same shape as the polygon cabinet, for supporting the cabinet therein.

Abstract: An indoor fan coil unit of a split type air conditioning or heat pump system. This indoor unit has a non-metallic polygon shaped casing with duct connections extending through each side. A cylindrical heat exchanger is mounted within the casing and a blower is mounted through an opening in the top of the casing within the heat exchanger. The blower draws air through the top of the casing and directs the air through the heat exchanger and out each duct connection to the ducts connected to each space to be conditioned.

Abstract: A blow-through fan coil unit is disclosed which includes a housing, a heat exchanger mounted to extend across the housing and a blower assembly for directing air therethrough. The heat exchanger is mounted at a relatively small angle to horizontal such that condensate drips across the entire width of the heat exchanger. A combination fan deck and condensate collection pan together with a fan scroll are utilized to collect condensate which drips from the heat exchanger.

Abstract: The optimum charge in the heating and cooling modes is achieved in a reversible heat pump system by providing a receiver in the indoor section which is sized to store an amount of refrigerant equal to the difference in the optimum charge in each mode. The amount of refrigerant in the receiver is varied in response to the ambient temperature whereby the refrigerant charge is optimized over a range of temperatures.