Abstract: A method for controlling suction pressure in a vapour compression system including one or more cooling entities is disclosed. For each cooling entity, a maximum required suction pressure and/or a required change in suction pressure for maintaining a target temperature in the refrigerated volume is obtained. A most loaded cooling entity among the one or more cooling entities is identified, based on the maximum required suction pressures and/or the required changes in suction pressure. The suction pressure of the vapour compression system is controlled in accordance with the maximum required suction pressure and/or required change in suction pressure for the identified most loaded cooling entity.

Abstract: A heating, ventilation, and air conditioning (“HVAC”) system includes an evaporator coil and a compressor fluidly coupled to the evaporator coil via a suction line. A condenser coil is fluidly coupled to the compressor via a discharge line and fluidly coupled to a metering device via a liquid line. A charge compensator is fluidly coupled to the liquid line via a connection line. A charge compensator re-heat valve is disposed in the connection line.

Abstract: An air-conditioning apparatus includes a selection unit and a determination unit, the selection unit selecting a reverse-defrosting operation mode or a heating-defrosting simultaneous operation mode, the reverse-defrosting operation mode being a mode in which all of parallel heat exchangers are defrosted by stopping a heating operation, the heating-defrosting simultaneous operation mode being a mode in which each parallel heat exchanger is sequentially defrosted while continuing a heating operation, the determination unit determining whether or not a defrosting operation is to be started, in which the determination unit is configured to start the defrosting operation in a state where the amount of frost deposited on the parallel heat exchangers is smaller in a case where the heating-defrosting simultaneous operation mode is selected than in a case where the reverse-defrosting operation is selected.

Abstract: A packaged terminal air conditioner unit (PTAC) includes a sealed system having an outdoor heat exchanger and an indoor heat exchanger fluidly coupled through a line filter assembly. The line filter assembly includes a housing defining an indoor port having a first cross sectional area and being fluidly coupled to the indoor heat exchanger, a bypass port having a second cross sectional area smaller than the first cross sectional area, and an outdoor port fluidly coupled to the outdoor heat exchanger. A line filter is coupled to outdoor port for filtering the flow of refrigerant passing in one direction and a check valve within the housing prevents flow through the line filter in the opposite direction. A bypass conduit provides fluid communication between the bypass port and the outdoor conduit to bypass the line filter.

Abstract: The invention discloses a refrigeration device, including: a first compressor unit (101), an indoor heat exchanger (3) and an outdoor heat exchanger (2), sequentially communicated; a first throttle device (401) and a second throttle device (402), sequentially connected in series; and an air supply device (5), provided between the first throttle device (401) and the second throttle device (402). The refrigeration device further includes a second compressor unit (102). An air intake port (B) of the second compressor unit (102) is communicated with an outlet of the outdoor heat exchanger (2). An outlet (E) of the second compressor unit (102) is communicated with the air supply port (C) of the first compressor unit (101) and an air exhaust port (D) of the first compressor unit (101) by means of a three-way valve (10), respectively.

Abstract: Surged heat pump systems, devices, and methods are disclosed having refrigerant phase separators that generate at least one surge of vapor phase refrigerant into the inlet of an evaporator during an on cycle of the compressor. This surge of vapor phase refrigerant, having a higher temperature than the liquid phase refrigerant, increases the temperature of the evaporator inlet, thus reducing frost build up in relation to conventional refrigeration systems lacking a surged input of vapor phase refrigerant to the evaporator. The temperature of the vapor phase refrigerant is raised in relation to the liquid phase with heat from the liquid by the phase separation, not by the introduction of energy from another source. The surged heat pump systems may operate in highest heat transfer efficiency mode and/or in one or more higher temperature modes.

Abstract: A refrigeration device has at least one storage chamber, a cold generator which refrigerates the storage chamber, and a regulating unit which regulates the performance of the cold generator and can be switched between an operating state of low average performance in which the performance of the cold generator is regulated in order to maintain the temperature of the storage chamber within a desired range, and an operating state of high average performance of the cold generator in which the temperature of the storage chamber falls below the desired range. A timer is designed to switch the refrigeration device periodically into the operating state of high average performance at times that can be set by the user.

Abstract: A refrigerant system according to an embodiment of the disclosure includes a outdoor heat exchanger performing heat exchange between outdoor air and a refrigerant; a compressor compressing the refrigerant; an indoor heat exchanger performing heat exchange between indoor air and the refrigerant; an expansion portion expanding the refrigerant; and a refrigerant pipe connecting the outdoor heat exchanger, the compressor, the indoor heat exchanger and the expansion portion to form a refrigerant cycle, wherein the outdoor heat exchanger includes a refrigerant storage portion storing the refrigerant to control flowing refrigerant amount on the refrigerant cycle.

Abstract: Systems and methods for generating liquid water include multiple atmospheric water generation devices adapted to produce liquid water from atmospheric humidity, used in conjunction with a turbine. The turbine is usable to simultaneously provide power to the devices, while the air intake thereof is used to move air associated with the devices, enabling a generally continuous supply of atmospheric air to be processed while reducing the accumulation of heat associated with the devices.

Abstract: A heat exchanger included in an air conditioner includes a first header pipe to have a refrigerant, compressed by a compressor, to flow therein and a first heat exchange unit coupled to the first header pipe to receive the refrigerant flowing in the first header, a second header pipe to have the refrigerant to flow therein and a second heat exchange unit coupled to the second header pipe to receive the refrigerant flowing in the second header pipe in the air cooling operation. A bypass pipe couples the first heat exchange unit with the second header pipe and a bypass valve controls a flow of the refrigerant through the bypass pipe. A controller controls the bypass valve such that the refrigerant is allowed to flow from the first heat exchange unit to the second header pipe in the air cooling operation.

Abstract: A refrigeration machine for a domestic refrigerator includes a compressor, a condenser and an evaporator, which are connected to form a refrigerant circuit, wherein a stop valve is arranged in a refrigerant path from the condenser to the evaporator.

Abstract: An air conditioner is provided. The air conditioner includes: an outdoor heat exchange unit in which a plurality of refrigerant tubes are disposed to be separated in a plurality of columns in a vertical direction to exchange heat of outdoor air and a refrigerant; a first refrigerant distribution device having branch pipes connected to a plurality of refrigerant tubes, respectively, of an upper part among the plurality of refrigerant tubes; a second refrigerant distribution device having branch pipes connected to a plurality of refrigerant tubes, respectively, of a lower part among the plurality of refrigerant tubes; and a communication pipe for communicating one of the branch pipes of the first refrigerant distribution device and one of the branch pipes of the second refrigerant distribution device.

Abstract: The various embodiments disclosed herein relate to anti-sweat heater systems for refrigeration units. More specifically, certain embodiments relate to anti-sweat heater control systems having one or more controllers that operate anti-sweat heaters independently of each other.

Abstract: A refrigerator is provided that includes a cold air duct that receives cold air circulating inside of a refrigerating chamber and a freezing chamber, an evaporator in the cold air duct, at least one defrosting heater in the cold air duct that selectively emits heat, a fan in the cold air duct, that selectively directs the cold air in an upward or downward direction, a motor that drives the fan, and an open/close device that closes a space having the evaporator, the defrosting heater, and the fan positioned therein selectively, thereby providing an improved defroster for an evaporator.

Abstract: A defrosting and chilling compartment that can be incorporated into the fresh food compartment of a refrigerator includes separate and independent pathways for selectively conducting warming or cooling air, respectively, to a holding section in the compartment where an item to be defrosted or chilled is located. Certain of the pathways are used to conduct warming air and certain other pathways are used to conduct cooling air. A heating device is associated with the pathways that conduct warming air, and the pathways that conduct cooling air are associated with a source of cooling air. Separate air-moving devices, such as fans for example, can be provided for the separate pathways. The pathways can include a closure device for selectively and variably opening and closing the pathways.

Abstract: A method of switching refrigerant flow between a path to a freezer evaporator in a freezer compartment and a path to a fresh food evaporator in a fresh food compartment of a refrigerator includes providing a three-way valve with at least three operational positions in flow communication with the path to the fresh food evaporator and the path to the freezer evaporator. A temperature difference (dtZ) between a freezer compartment temperature and a freezer evaporator evaporating temperature is measured. A temperature difference (dtF) between a fresh food compartment temperature and a fresh food evaporator evaporating temperature is measured. The operation of the three way valve is controlled based on at least one of dtZ and dtF.

Abstract: A defrosting and chilling compartment that can be incorporated into the fresh food compartment of a refrigerator includes separate and independent pathways for selectively conducting warming or cooling air, respectively, to a holding section in the compartment where an item to be defrosted or chilled is located. Certain of the pathways are used to conduct warming air and certain other pathways are used to conduct cooling air. A heating device is associated with the pathways that conduct warming air, and the pathways that conduct cooling air are associated with a source of cooling air. Separate air-moving devices, such as fans for example, can be provided for the separate pathways. The pathways can include a closure device for selectively and variably opening and closing the pathways.

Abstract: A heat exchanger liquid refrigerant defrost system disclosed herein specifically designed to defrost the coil subsystems used on an outdoor heat exchanger used on a building heat pump unit or combination heat pump/air condition unit. The outdoor heat exchanger contains at least two coil subsystems each including having a first secondary bypass check valve, a secondary liquid line, a bypass solenoid, a suction solenoid, and a metering device. During use, the flow of warm liquid refrigerant through the coil subsystems is selectively controlled to defrost the coil subsystem one chamber at a time. The other coil subsystems continue to exchange heat and warm the building. When all of the coils systems are sequentially defrosted, all of the coil subsystems may operate in a heating mode or begin the defrost cycle again. Two important benefits of the system over a conventional heat exchanger are the amount of energy required to defrost the coil subsystem is reduced and a supplemental heat source is not needed.

Abstract: An object of the present invention is to provide a method for manufacturing a multi-stage compression type rotary compressor which can avoid the replacement of parts to be used as much as possible to reduce costs and also which enables easily setting an appropriate displacement volume ratio while preventing the compressor from being increased in size. The gist of the present invention is that an inner diameter of a lower cylinder is altered without altering its thickness (or height), and a displacement volume ratio between first and second rotary compression elements is set to an optimum value in accordance with the alteration.

Abstract: The invention is a method and a defroster control circuit to sequentially defrost a series of refrigerated display cases. The method begins by operating the series of refrigerated display cases during a normal refrigeration mode. At the beginning of the refrigeration mode, a refrigeration time is set to zero and an elapsed refrigeration time is subsequently monitored. When the refrigeration time equals an activation time, a defrost mode begins and a defrost cycle for the first case starts. The defrost mode for the first case terminates based either on a defrost time criterion or a defrost temperature criterion. After the first refrigerated display case is defrosted, a refrigeration mode is restarted for the first case. After the first refrigerated display case is defrosted, the other refrigerated display cases in the series of refrigerated display cases are then sequentially defrosted.

Abstract: A dehumification/refrigeration system has a first suction stop valve, first evaporator and first timer control contact and a second suction stop valve, second evaporator and second timer control contact. The first suction stop valve is adapted to inactivate the first evaporator upon the detection of ice and to activate the second suction stop valve and second evaporator. The second suction stop valve is adapted to inactivate the second evaporator upon the detection of ice and to activate the first suction stop valve and first evaporator. A supplemental relay and an associated third timer control contact simultaneously activate the first timer and second control contacts. A timer sequentially activates one timer control contact to the exclusion of the others.

Abstract: A refrigerator includes a first compartment, a second compartment, a compressor compressing and discharging refrigerant, a first evaporator connected to the compressor to cool the first compartment, the first evaporator having an outlet, a second evaporator connected to the compressor in parallel with the first evaporator to cool the second compartment, the second evaporator having an outlet, a check valve connected between the outlets of the first and second evaporators to prevent the refrigerant out of the first evaporator from entering the second evaporator, a flow-path switching element for switching a cooling mode between a first cooling mode in which the refrigerant discharged from the compressor is caused to flow through the first evaporator to thereby cool the first compartment and a second cooling mode in which the refrigerant discharged from the compressor is caused to flow through the second evaporator to thereby cool the second compartment, and a control device provided for controlling the compres

Abstract: A heat management system for a building having at least one cooling device is provided. The heat management system includes a refrigeration system in heat exchange contact with a cooling system for providing cooling energy to the cooling system and to the cooling device. The cooling system includes at least two independent flow paths in heat exchange contact with the cooling device for cooling the cooling device. In addition, the heat management system includes a defrost system in heat exchange contact with the cooling device through the independent flow paths wherein the defrost system can be operated to independently defrost each flow path of the cooling system. The system is efficient to operate in conjunction with a geothermal system and provides effective building atmosphere de-humidification.

Abstract: The present invention relates to a dryer for compressed air. The dryer employs two evaporators disposed in the compressed air pathway. The dryer uses a three-way valve to control the orientation of the compressed air current. A heat-exchanger is included in the cold-producing medium system for avoiding ice blockage of the compressed air outlet. The dryer provides the high-pressure cold-producing medium at a front portion with more potential cooling, so that the evaporators create a lower temperature for drying the compressed air better. A four-way valve is provided to control the two evaporators working alternately, so that the high-temperature cold-producing medium is directed into the iced idle evaporator by a solenoid valve, to melt the ice rapidly and drain it from the system immediately through an automatic drain valve.

Abstract: The invention comprises a merchandiser having a refrigerated product area with a plurality of product zones and separate air flow circulation means for the respective product zones, laterally adjacent modular cooling coils associated with the respective air flow circulation means and having a normal air flow cooling mode, and defrosting means constructed and arranged for selectively discontinuing the normal cooling mode of one modular cooling coil to effect a defrosting mode thereof during a period of continued normal cooling mode operation of another of said modular cooling coils, and thereafter defrosting another modular cooling means after re-establishing normal air flow cooling of said one modular cooling coil. The invention further comprises the method of defrosting separate modular cooling coils on staggered defrost cycles to maintain at least partial cooling air flow to the merchandiser product area at all times.

Abstract: A defroster for a heat pump to remove frost which falls on an evaporator during a heating operation of the heat pump. The defroster includes a condenser, compressor, and a cylindrical converting valve. A by-pass tube branches off at an outlet of the compressor to induce refrigerant and an on-off valve selectively induces the refrigerant into the bypass tube. A first inlet tube is formed at an upper portion of the cylindrical converting valve for receiving refrigerant drawn by the bypass tube and a first outlet tube emits the refrigerant into an upper portion of the evaporator. A second inlet tube is formed at a lower portion of cylindrical converting valve for receiving refrigerant coming from the condenser and a second outlet tube emits the refrigerant into a lower portion of the evaporator. A converting plate, rotating in the cylindrical converting valve, connects the first inlet tube with the first outlet tube, while connecting the second inlet tube with a second outlet tube.

Abstract: There are described a defrosting method and apparatus for a freezer-refrigerator using a GA-fuzzy theory.A defrosting method for a freezer-refrigerator using a GA-fuzzy theory of the present invention comprises the step of: inputting reference learning data by experiment and actual data to a microcomputer; calculating each frost-quantity on evaporators for a freezing room and a cold-storage room from the input data; inferring each defrosting period for the freezing room and cold-storage room from each frost-quantity on the evaporators for the freezing room and cold-storage room by using a GA-fuzzy theory so that the defrosting periods can be synchronized with each other; and controlling a defrosting heater depending on each defrosting period.

Abstract: An automated processing freezer system is described that provides a plurality of cooling units to chill the air within a freezing enclosure, whereby the coils of each cooling unit may be defrosted independently, without louvers or other moving mechanisms, while the cooling output of the freezer system is maintained 24 hours a day. Baffles in the freezing enclosure isolate each cooling unit from the airflow associated with the other cooling units, thereby eliminating the need for expensive and less efficient louvers surrounding the coils of each cooling unit.

Abstract: A method and apparatus for sequentially operating a refrigeration system with multiple evaporators is provided in which only one evaporator is operated at a time and is run until a detected demand for cooling associated with that evaporator is satisfied, or until a predetermined time period has elapsed which corresponds to the normal run time for that evaporator. If the run time expires prior to the demand for cooling being satisfied, and if demand for cooling by another one of the evaporators is present, then operation of the first evaporator is terminated and the other evaporator is operated. Efficiency enhancements are provided such as prematurely initiating operation of a second evaporator at the conclusion of operation of a first evaporator if it appears that a demand for cooling by the second evaporator will occur within a short period of time following termination of operation of the first evaporator.

Abstract: A bubble detector for a liquid stream flowing within a conduit comprising a walled chamber communicating with the conduit interior, the chamber being positioned to trap and accumulate bubbles entrained with the liquid stream. A window in the chamber wall for optically examining the chamber, the window having its inner surface positioned to provide an interface with the chamber contents. Means for distinguishing between liquid and gas in the chamber comprising a light source positioned to direct its light toward the window inner surface, and a light sensor oriented to receive light reflected from the window inner surface the light source being positioned at such angle to the window inner surface that transmission of light with refraction occurs when liquid is present in the chamber and total internal reflection occurs when gas is present in the chamber. And an output device responding to the sensor for taking an action when a predetermined volume of bubbles have accumulated in the chamber.

Abstract: The invention relates to a method and a device for compression of gases, in particular of air, within a compressed air piping system. The air drawn in for the compressor is cooled below 0.degree. C. within a freeze-dehumidifer in a cooling channel. The supply of undercooled refrigerant into the freeze-dehumidifier is interrupted during the defrosting of the freeze-dehumidifier situated within the cooling channel for the air drawn in towards the compressor. The condensate appearing in the form of ice on the freeze-dehumidifer is separated thereby. The defrosting operation is terminated after a pressure of the refrigerant corresponding to a positive temperature of the freeze-dehumidifier is exceeded, or after a presettable period has elapsed. The pressure of the refrigerant is monitored in the suction pipe and if appropriate in the delivery or pressure pipe of the refrigerant compressor.

Abstract: An air conditioning apparatus includes two different refrigerating circuits in one central unit for supplying a conditioned air into a defined space through an air duct. Each refrigerating circuit has an air exhausting damper for exhausting internal air from the defined space, and an external air intake damper for taking the external air into the defined space through the central unit. One of the refrigerating circuits forcibly carries out the heating operation, and the external air intake damper thereof is maintained in a closed state while the other refrigerating circuit carries out the defrosting operation to prevent temperature of the conditioned air fed from the central unit into the defined space from decreasing below a desirable level.

Abstract: A compartmentalized transport refrigeration system including a refrigeration system having a compressor and first and second selectable refrigeration circuits normally associated with cooling and heating modes, respectively, a trailer having at least first and second compartments, a host evaporator, a condenser in the first refrigeration circuit, and at least one remote evaporator, with the evaporators each being associated with a trailer compartment. The second refrigeration circuit is selected when a remote evaporator requires heating, and when another evaporator requires cooling while a remote evaporator requires heating, refrigerant is returned to the compressor via the first refrigeration circuit and the evaporator requiring cooling, entering the first refrigeration circuit at a point which by-passes the normal condenser function, to cause the evaporator requiring heating to function as a condenser for the evaporator requiring cooling.

Abstract: Apparatus and method for controlling compressor operation in conjunction with sensing the lowest temperature operating evaporator coil, or area serviced thereby, of a commonly-piped cooling system. A thermoelectric sensor voltage output is compared with a set-point voltage by an integrator, the output of which is applied to control the pressure for the system.

Abstract: A closed circuit refrigeration system includes a compressor, a remote condenser connected to the output of the compressor, and one or more evaporators coupled within the system. A hot gas defrost system is included to rapidly obtain a high operating defrost gas pressure upon the initiation of a defrost cycle and to thereafter maintain an adequate pressure for hot gas defrosting of the evaporators. The hot gas defrost system includes a differential pressure regulated valve which closes the compressor discharge line to shunt the hot gas discharge directly into a hot gas defrost manifold. The differential valve is controlled by a defrost control means. The refrigeration system can also include a receiver tank and a by-pass conduit for shunting refrigerant liquid through the by-pass conduit rather than through the receiver tank depending upon operating conditions. A method of operating a closed circuit refrigeration system with the above features is set forth.

Abstract: A proximity sensor is mounted on a remote controlled moveable base and is used for detecting a layer of frost of a specified thickness when it accumulates on the subfreezing surface of a refrigeration system. The sensor is positioned at a distance from the subfreezing surface which is greater than the specified thickness of the frost layer which is to be detected. At periodic intervals the moveable base is driven by remote control to move the sensor closer to the subfreezing surface by an amount sufficient for the sensor to make contact with the frost layer when it has accumulated to the specified thickness to be detected.

Abstract: A refrigerator including a cabinet having storage compartment, an electrical anti-sweat heating means for arming a portion of the cabinet, refrigerating means including a compressor and an evaporator for cooling the compartment, and temperature sensing means to energize the compressor at one predetermined temperature and de-energize the compressor at a second lower temperature. There is provided a switch associated with the temperature sensing means to apply full electrical power to the electrical anti-sweat heating means when the compressor is energized and apply half electrical power to the electrical anti-sweat heating means when the compressor is not energized.

Abstract: A system for refrigerating food products utilizes a saturated gaseous refrigerant, commonly called "cool gas" for defrosting an evaporator or set of evaporators. When defrost is to occur, the saturated gaseous refrigerant flows from a receiver through the evaporator or set thereof being defrosted. A differential pressure control switch operates to prevent flow of refrigerant to the receiver from the liquid supply line through which said refrigerant normally flows from the condenser to the evaporators. The flow from the liquid line to the receiver is prevented whenever the pressure in the liquid line exceeds the pressure in the receiver by a predetermined value.

Abstract: A control sysem for controlling a plurality of refrigeration compressors has an input circuit for receiving a plurality of control signals from control devices for a plurality of evaporators connected to the refrigeration compressors with means for controlling the control signal of the evaporator having the greatest load to control the total operating capacity of the refrigeration compressors. Each of the input circuits has means for rendering the control signal input ineffective from a particular evaporator when the evaporator is in a defrosting cycle to allow the signal from the evaporator having the greatest load control the operating capacity of the refrigeration compressors.