Abstract: A transport refrigeration system having a dehumidifying mode. During the dehumidifying mode, a main or primary condenser is effectively removed from the active refrigerant circuit and an auxiliary or secondary condenser located in a conditioned air flow path performs the condensing function. This arrangement enables an evaporator in the air flow path to continue to cool and remove moisture from the conditioned air after a predetermined set point temperature has been reached, without a significant reduction in temperature of the conditioned air returned to a served space, as heat removed from the conditioned air by the evaporator is returned to the conditioned air by the secondary condenser.

Abstract: An air-conditioning system being powered by a supply of compressed air, has an air cycle machine which incorporates a filter. The filter receives pressurized air for filtration after said air has passed through a heater which optimizes the temperature and humidity of the air and passes through a second reheater downstream of the filter and upstream of the turbine to maximize the efficiency of the turbine.

Abstract: A refrigeration cycle includes at least a variable-capacity compressor, an outdoor heat exchanger, an evacuation device, and an indoor heat exchanger, all of which communicate with each other. A reheater is arranged in association with the indoor heat exchanger. A temperature setting unit sets a desired indoor temperature. A humidity setting unit sets a desired indoor humidity. A temperature detecting unit detects an indoor temperature. A humidity detecting unit detects an indoor humidity.

Abstract: A reverse cycle heat reclaim coil in a refrigeration system having compressor, condenser and receiver means on the high side, including first valve means for selectively connecting the heat reclaim coil between the compressor discharge side and the condenser means to obtain heat reclamation during winter operations, and second valve means for selectively connecting the heat reclaim coil between the condenser and receiver means to obtain refrigerant subcooling during summer operations. The invention also includes the method of selectively connecting the heat reclaim coil in reverse cycle refrigerant flow in seasonal heat reclamation and subcooling modes.

Abstract: The system in the present invention includes HVAC unit, such as an air-conditioner, having an evaporator coil, and a heat exchanger for drawing heat from air entering the inlet side of the air-conditioner evaporator and supplying heat to air at the outlet side of the air-conditioner evaporator. The heat exchanger is a phase change heat pipe-type heat exchanger, having a evaporator before the air-conditioning evaporator and a condenser after the air-conditioner evaporator.

Abstract: The specification discloses a novel refrigeration/air exchanger unit (30) adapted for use with a main refrigeration unit (28) of a trailer truck (10) including frozen and refrigerated compartments (20, 22) to maintain the refrigerated compartment at a predetermined temperature above freezing without an auxiliary refrigeration unit. The system (30) includes a duct (34) interconnecting the compartments, a fan (44) for drawing cold air from the freezer compartment into the refrigerated compartment to lower the temperature therein, and another fan (62) and associated heating element (72) in the refrigerated compartment for modulating the temperature therein. The fans (44, 56) and heating element (72) are automatically controlled responsive to circuitry including a thermostat (78).

Abstract: A gas condenser apparatus and method is described employing two heat exchanger stages for condensing water vapor and other contaminates, such as organic solvents, out of hot air or other treated gas by means of a cooling gas which is provided by feeding back the treated gas through the cooling passages of such heat exchanger stages after removal of the water and solvents. The heat exchangers are of the counterflow type so that the treated gas and the cooling gas flow in opposite directions therethrough. Preferably, water vapor is removed from the treated gas by condensing it in the first stage and the solvents are removed by condensing them in the second stage thereby separating the condensed water and solvents. Auxiliary cooling coils are provided at the input of the first stage and at the output of the second stage for further cooling of the treated gas.

Abstract: A vent condenser that includes an inner tube, an outer shell mounted on and surrounding the inner tube, a middle shell having an annular body and a closed upper end mounted with the body thereof radially spaced between the inner tube and the outer shell, and a helical heat exchange tube mounted in the space between the inner tube and the middle shell in engagement with the body of the middle shell and with the inner tube. A helical channel is formed between the middle shell, the inner tube, and spaced convolutions of the helical tube. Cooling fluid is directed through the helical tube. Discharge from the deaerator vent passes up the inner tube to return along the helical channel to be cooled in indirect heat exchange relation with the cooling fluid in the helical tube to condense water therefrom and to separate the water from noncondensable gases.

Abstract: Apparatus and methods for simulating varying atmospheric conditions comprises an enclosure that is sealed except for an air inlet and an air outlet by means of which air is admitted to and exhausted from the enclosure. The inlet of the enclosure is connected to a compressed air source and the outlet of the enclosure is connected to a vacuum pump. Adjustment of the flow rates of air into and from the enclosure results in changes in the air pressure within the enclosure to simulate barometric pressure changes from below to well above sea level. Air admitted to the enclosure is temperature and moisture conditioned to simulate changes in atmospheric temperature and humidity conditions. Apparatus and methods according to the disclosure are particularly suited for the testing and calibration of vehicle carburetors.

Abstract: Apparatus and method for controlling a vehicular temperature conditioning system in response to temperature conditioning demand, outdoor ambient air temperature, discharge air temperature, and vehicle engine oil pressure which is indicative of the rotational speed of a clutch and shaft drivingly connecting the temperature conditioning system to the vehicle engine. A cooling mode is initiated if (1) the return air (comfort zone) temperature exceeds a predetermined maximum value, (2) the outside ambient air temperature exceeds a predetermined limit, and (3) the rotational speed of the clutch and drive shaft, as indicated by the vehicle engine oil pressure, is less than a predetermined limit. During operation in the cooling mode, a reheat cycle is initiated in response to the return air temperature and the discharge air temperature.

Abstract: This invention relates to apparatus for drying gases, more particularly compressed air. In the gas drying apparatus there is presented a single vessel partitioned into various flow passages so as to direct the incoming water vapor bearing compressed gases through a heat exchanger, a refrigeration section, a demister, and then through a second heat exchanger for exit from the apparatus. The arrangement of parts is such as to permit all of these functions in a very small vessel.

Abstract: A heat exchanger for cooling system compressed air dehumidifiers includes an inner body forming a dehumidifying passage provided with a cooler, an outer body surrounding the inner body and forming a precooling passage along the outer periphery of the inner body, an air supply port opened in the outer body through which compressed air is led into the precooling passage from one end thereof, a communicating hole opened in the inner body to guide the air led into the precooling passage out through its other end into the dehumidifying passage through one end thereof, and a plurality of heat transmitting pipes extending through the precooling passage in order to form an air-flow passage which guides the compressed air out of the other end of the dehumidifying passage to an air discharge port provided in the outer body.

Abstract: A climate-control unit which in regard of size and weight and of the required power, is particularly suitable for transporting goods in containers and the like, whilst it can provide optimum climate control even if the goods to be transported develop noxious gases.The control-unit comprises a device for controlling the fresh air available in the container and/or to be introduced therein within previously adjustable temperature and humidity limits and by means for uniformly conveying air into the useful loading space and out of the same.

Abstract: A heat exchanger system and ducting arrangement therefor includes a pair of heat exchanger units defining an elongated space between them, and individually having a first fluid flow path and a second fluid flow path therethrough for transferring heat from a relatively hot fluid to a relatively cool fluid, a bifurcated inlet channel for delivering the hot fluid to the heat exchanger units, a pair of exhaust conduits for conducting the hot fluid away from the heat exchanger units after heat is extracted therefrom during its travel through the first fluid flow paths, an elongated duct for delivering the cool fluid to the elongated space and from there oppositely outwardly to the heat exchanger units, and a pair of outlet manifolds for conducting the relatively cool fluid away from the heat exchanger units after it is beneficially heated during its travel through the second fluid flow paths.

Abstract: A device for chill-drying a gas comprising a gas/gas heat-exchanger and a gas/cooling medium heat-exchanger located within a pressure vessel such that the heat-exchangers define channels between themselves and the walls of the vessel, which channels connect a gas outlet at the bottom of the gas/gas heat-exchanger with a gas inlet at the top of the gas/cooling medium heat-exchanger. The pressure vessel is cylindrical and the gas/gas heat-exchanger has a curved surface lying against the inner surface of the pressure vessel, and a planar surface abutting against the gas/cooling medium heat exchanger which has a rectangular cross-section and its corners remote from the gas/gas heat exchanger abutting against the walls of the pressure vessel.

Abstract: Air at substantially ambient pressure is cooled in a heat exchanger and introduced into an enclosure for cooling. The air is withdrawn from the enclosure and a portion of the air is expanded through a turbine for additional cooling and passed through the heat exchanger for the removal of heat therefrom. The air is then compressed to substantially ambient pressure and expelled. Additional cooling of the expanded air from the turbine may be obtained by evaporating a fluid therein. The fluid may be water condensed in, and withdrawn from, the heat exchanger.