Abstract: A refrigerant recovery system is operative in a recovery mode to recover refrigerant from an air conditioning circuit, and in a cleaning mode to cleanse the recovered refrigerant of impurities therein. In the recovery mode the refrigerant is withdrawn from the air conditioning circuit and flowed through a filter dryer by a compressor which then forces the refrigerant through a condenser into a storage container. In the cleaning mode, liquid refrigerant from within the storage container is continuously flowed through the filter dryer and then back into the storage container. To remove impurities from within the air conditioning circuit, the recovery system is also operative in a closed loop flushing mode in which liquid refrigerant from within the storage container is continuously pumped through a portion of the air conditioning circuit, filtered, and then returned to the storage container without any appreciable quantity of refrigerant being vented to atmosphere during the flushing process.

Abstract: The present invention is directed to a system for avoiding possible compressor damage occasioned by major flood back of the suction accumulator in a refrigeration system. In one embodiment of the invention, a float member slides upwardly and downwardly upon the stand pipe of the accumulator in response to the level of refrigerant therein, and when the refrigerant rises to a critical level, the float member is effective to block the outlet openings in the upper end of the suction accumulator, preventing flow of refrigerant to the compressor sufficient in volume to cause damage thereto. In another embodiment of the invention, a float member having magnet means associated therewith moves vertically in opposite directions upon a tubular support connected to the suction accumulator structure.

Abstract: An apparatus for recovering and recycling used refrigerants from automotive air conditioning systems and similar air conditioning systems is disclosed having a unique cleaning assembly, a unique coolable storage means, and for recharging recycled refrigerant a unique metering means, as well as gauge assembly for measuring the amount of gas contaminates in the used refrigerants.

Abstract: A multiple cooling medium recovery apparatus comprising, a refrigerating circuit which circulates a refrigerant through a compressor, a condenser, an expansion valve, a heat exchanger with an evaporation path and a compressor, and a plurality of recovery routes separated from one another to which a plurality of kinds of cooling mediums to be recovered are supplied, respectively. A plurality of condensation paths are formed in the heat exchanger separaately from one another. Each recovery route defines a condensation path separately from the other recovery routes. A plurality of independent recovery routes are formed in a single recovery apparatus. A plurality of kinds of cooling mediums can be recovered simultaneously, or without cleaning the apparatus before each recovery.

Abstract: An air conditioning system comprising a refrigerant circuit. A thermal storage device is arranged in the refrigerant circuit and can store heat and utilize the stored heat to increase heating capacity at the time of kickoff of heating. A temperature detector detects a temperature at a thermal storage portion of a thermal storage and radiating heat exchanger which is housed in the thermal storage device. A counter counts a thermal storage operation period required for the temperature detected at the thermal storage portion to achieve a predetermined value, outputs a signal indicative of stopping a thermal storage operation when the detected temperature has achieved the predetermined value, counts the lapse of a predetermined thermal storage operation stoppage period after stop of the thermal storage operation, and outputs a signal indicative of starting the thermal storage operation when a predetermined thermal storage operation stoppage time has passed.

Abstract: The normal path for the flow of oil/refrigerant being reclaimed from the cooler is changed during periods of low load operation such that the oil/refrigerant mixture flows directly from the cooler to the ejector rather than by way of normal suction housing pass. This is accomplished by valve means responsive to either a pressure differential or the guide vanes position, either of which is indicative of the load condition.

Abstract: A hollow shaft bearing for a drying cylinder of a paper machine. The hollow shaft bearing is provided with thermal insulation between the interior of the hollow shaft and the surface of the journal on which a bearing is supported. The insulation is formed by a coaxial annular space formed between the inside wall of the hollow shaft and the outside wall of the hollow shaft which supports the bearing.

Abstract: A portable cooler for cooling an article by utilizing the endothermic and exothermic phenomenon pertaining to a chemical reaction is disclosed, in which an adsorbent and a working medium are sealed in a reaction chamber defined between an inner wall and an outer wall, a working medium retaining member is disposed on the inner wall inside the reaction chamber for holding therein the working medium, the working medium retaining member being spaced from the adsorbent disposed on the outer wall, and a heater is held in contact with the adsorbent for regenerating the same, at least a part of said outer wall constituting a heat radiating portion.

Abstract: An apparatus for cooling refrigeration containers using pressurized liquid carbon dioxide is disclosed. The container has upper and lower compartments with a longitudinal distribution pipe located in the upper compartment which extends substantially the length of the container. The pressurized, liquid carbon dioxide is distributed through the distribution pipe in the upper compartment through a plurality of apertures located in the longitudinal distribution pipe which causes an accumulation of carbon dioxide snow in the upper compartment. The refrigerated gas cools the sidewalls of the lower compartment by passing through serpentine passages contained within those sidewalls. There are also switchable cooling vents which, when opened, allow refrigerated gas to pass from the upper compartment directly into the lower comparment.

Abstract: Liquid pressure amplification with superheat suppression is used in an air-conditioning or refrigeration system which includes a compressor, a condenser, an expansion valve, and an evaporator, interconnected by conduits in a closed refrigerant loop. A first conduit coupling an outlet of the compressor to an inlet to the condenser. A centrifugal pump is coupled to the condenser (or receiver) outlet for boosting the pressure of the condensed liquid refrigerant by a substantially constant increment. A second conduit transmits a first portion of the condensed liquid refrigerant from outlet of the pump through the expansion valve into the evaporator to effect cooling. A third conduit transmits a second portion of the condensed liquid refrigerant from the pump outlet into the condenser inlet, which cools the superheated vapor refrigerant entering the condenser, reducing head pressure.

Abstract: In multiple system type air conditioner, there are provided an auxiliary outdoor heat exchanger provided in an outdoor unit, and defrosting device that, on heating operation, periodically or as needed feeds the refrigerant discharged from the compressor to the outdoor heat exchanger and all the indoor heat exchangers. After the refrigerant has passed through the outdoor heat exchanger and all the indoor heat exchangers, the refrigerant returns to the compressors through the auxiliary outdoor heat exchanger.

Abstract: An evaporative air cooler with a rotary fan blowing and evaporating droplets generated by an impeller, which shares the same motor shaft with the rotary fan. The evaporative air cooler comprises a housing (1) having rear inlets (23), front outlets (3), and a motor-supporting plate (6). An electric motor (7) is vertically mounted to the plate with its rotating shaft being directed downward and connected to a rotary fan (9). The rotary fan sucks, blows and evaporate droplets produced by an impeller (14) with blades (11) and a fluid-sucking tube (13).

Abstract: A method of controlling a multiplicity of condenser fans in a refrigeration system comprising the steps of: calculating a first difference in state between a high pressure side and a low pressure side of the refrigeration system; determining an optimum state for the refrigeration system; determining a second difference in state between the first difference and the optimum difference; and controlling the multiplicity of condenser fans if the second difference exceeds a predetermined value.

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: A low-temperature storage of the invention has N refrigeration units that may be used for independently refrigerating N chambers, and a controller having N sets of temperature region setting means and corresponding N temperature settling means usable for N refrigeration chambers. Each of said temperature region setting means comprises a plurality of temperature control switches which may assume a combination of ON and/or OFF states for establishing a desired temperature region in an associated chamber. Furthermore, within respective temperature regions, desirable temperatures may be preset by associated temperature setting means. When the number chambers available is less than N, said controller may be used for controlling an arbitrary number of refrigeration chambers in a desired combination of modes by setting non-used set of said temperature setting means in prohibited mode.

Abstract: A cooling system includes a turbo compressor for compressing a coolant and a turbo expander fluidically connected to the turbo compressor via one or more heat radiators. In order to insure a constant expansion ratio in the turbo expander at all operating temperatures, without varying the rotational speed of the turbo compressor, a first controller controls the flow rate of coolant to the turbo expander while a second controller in a bypass passage controls a flow rate of coolant bypassed to the intake side of the turbo compressor. The first and second controllers are controlled by a control unit sensitive to the coolant temperature at the intake side of the turbo expander.

Abstract: A drinking container having a cylindrical side wall attached along threads at an external top portion to a screw on cap member sealed to the side wall to prevent leakage of fluid from the container. The cap member is integral with a freezable insert containing an aqueous solution with a downwardly descending freezable insert containing an aqueous solution with a freezing point below the freezing point of water. The freezable insert can have its contents frozen and then returned to a position within the cylindrical side wall of the container to cool a liquid placed within the container. Alternatively, the freezable insert is separate from the cap and is screwed into a central bore of the cap after being frozen.

Abstract: A method and apparatus for recovering and purifying refrigerant contained in a refrigeration system has a first mode of operation wherein refrigerant is withdrawn from the system being serviced, compressed, condensed and delivered in liquid form to a refrigerant storage means. The pressure ratio across the recovery compressor is monitored, and, when the pressure ratio exceeds a value above which the compressor may be adversely affected withdrawal of the refrigerant from the refrigeration system is terminated. The system is then operated in a closed, cooling mode wherein refrigerant recovered from the system and stored in the storage means is withdrawn therefrom by the compressor, compressed condensed, and expanded and returned to the storage means to thereby lower the temperature and pressure of the storage means and the refrigerant contained therein.

Abstract: An air conditioning apparatus in which one outdoor unit is connected to several indoor units through respective refrigerant tubes and signal conductors. The outdoor unit has compressors for discharging refrigerant and an outdoor heat exchanger. Each outdoor unit has an indoor heat exchanger and an indoor heat exchanger temperature sensor. When an operating device signals a check node, the compressors are stopped for a predetermined time period. Then the compressors are operated to sequentially discharge refrigerant to each indoor unit. A checking device then monitors the signal conductors of each indoor unit for a signal indicating a certain temperature condition. Based on the signals received, the checking device determines whether the indoor units are properly connected to the outdoor unit.

Abstract: An apparatus and method for refrigerant recovery which removes refrigerant in liquid form from an air conditioning unit by cooling the refrigerant, thereby creating a temperature gradient between the air conditioning unit and the recovery apparatus which urges the refrigerant from the air conditioning unit into the apparatus, and then storing the refrigerant in a tank. Refrigerant vapor is pumped from the tank back into the air conditioning unit, thereby avoiding pressure buildup in the tank and also preventing the liquid refrigerant from being retained in the air conditioning unit due to vacuum created therein by the refrigerant removal. Cooling apparatus within the recovery apparatus uses a separate supply of refrigerant to cool the refrigerant, and neither the air conditioning unit itself nor the removed refrigerant is used for this purpose, allowing refrigerant removal from an inoperative air conditioning unit.