Abstract: An air-conditioning system operated with CO2 for a vehicle has a high-pressure section that is connected to the output of a compressor and includes a gas cooler, a low-pressure section that is connected to the suction side of the compressor and includes an evaporator, and an expansion member connecting the high-pressure section and the low-pressure section. The expansion member has a fixed restrictor with a throttle opening of predetermined length and diameter connected between an inlet from the high-pressure section and an outlet to the low-pressure section whereby under all operating conditions of the system, a pressure of refrigerant in the high-pressure section of the system is limited to values of less than 14 MPa. The restrictor can be connected in parallel with a pressure limiting valve and can include two or more different throttle openings that can be selectively connected for refrigerant flow.

Abstract: A refrigerant cycle system includes a variable displacement compressor, and first and second evaporators disposed in parallel. In the refrigerant cycle system, it is determined whether a refrigerant flow amount from the compressor is in a low flow amount area when first and second blowers for blowing air to the first and second evaporators are operated at the same time. When it is determined that a predetermined time passes after the refrigerant flow amount is determined to be in the low flow amount area, the operation of the compressor is forcibly switched between a large discharge capacity and a small discharge capacity. Accordingly, it can prevent oil returning to the compressor from being short due to the operation of the compressor in the low flow amount area.

Abstract: An air-conditioning system with an air-conditioning compressor, an electric motor and a refrigerant circuit, in particular for motor vehicles, the electric motor being controllable by an electronic control device and an expansion member arranged in the refrigerant circuit, a further expansion member is arranged between the high-pressure side of the expansion member and the suction side of the air-conditioning compressor in the refrigerant circuit, and the electronic control device is connected thermally conductively to the low-pressure side of the further expansion member. The further expansion member is controllable as a function of the temperature of the electronic control device.

Abstract: A refrigerator is provided, which includes a main body, an inner casing accommodated in the main body and formed with a plurality of storage chambers arranged up and down, a compressor provided in a machine room and isolated from the storage chambers, and a condenser for condensing a refrigerant supplied from the compressor. The refrigerator includes a plurality of evaporators surrounding the inner casing to form a refrigerant flow path toward the lower portion of each storage chamber from the upper portion thereof, a refrigerant valve installed at a refrigerant tube extended from the condenser to an inlet of each evaporator, a suction tube extended from an outlet of each evaporator to the compressor, and a plurality of temperature sensors disposed in the upper portion of each storage chamber, for detecting the temperatures of the respective storage chambers.

Abstract: A system includes a compressor and an expansion valve. The exit side of the compressor and the inlet side of the expansion valve are connected by a high pressure conduit, and the exit side of the expansion valve and the inlet side of the compressor are connected by a low pressure conduit. A bypass conduit is connected to the high pressure conduit and the low pressure conduit and a flow rate regulating valve is mounted on the bypass conduit. A control unit controls the expansion valve and the flow rate regulating valve to perform two starting operations in such a way that the flow rate regulating valve is open and the expansion valve is closed in a first starting operation, and the flow rate regulating valve is closed and the electronic expansion valve is open to a predetermined extent in a second starting operation. The compressor is controlled by a duty control signal having a period shorter than a period during a normal operation for starting operations.

Abstract: An air-conditioning system operated with CO2 for a vehicle has a high-pressure section that is connected to the output of a compressor and includes a gas cooler, a low-pressure section that is connected to the suction side of the compressor and includes an evaporator, and an expansion member connecting the high-pressure section and the low-pressure section. The expansion member has a fixed restrictor with a throttle opening of predetermined length and diameter connected between an inlet from the high-pressure section and an outlet to the low-pressure section whereby under all operating conditions of the system, a pressure of refrigerant in the high-pressure section of the system is limited to values of less than 14 MPa. The restrictor can be connected in parallel with a pressure limiting valve and can include two or more different throttle openings that can be selectively connected for refrigerant flow.

Abstract: A bottom-freezer refrigerator comprises a generally rectangular box-like refrigerator housing including a top division and a bottom division with an adiabatic partition wall intervening between the top and bottom divisions. The top division has a refrigerator chamber and a crisper chamber both defined therein. The bottom division has a freezer compartment defined therein. The bottom-freezer refrigerator of the structure described above also comprises a first cooler provided in the top division at a location spaced from a rear wall portion of the crisper chamber, a first circulating fan disposed in the vicinity of the first cooler, a second cooler provided in the bottom division, and a second circulating fan disposed in the vicinity of the second cooler. The refrigerator chamber and the crisper chamber are cooled by the first cooler in cooperation with the first circulating fan, whereas the freezer compartment is cooled by the second cooler in cooperation with the second circulating fan.

Abstract: The economizer flow to the intermediate compression chamber inside a compressor is controlled via a variable restriction. The size of the restriction is selected to optimize unit performance in relation to operating conditions.

Abstract: In order to realize higher compatibility of high-performability and energy saving of a refrigerator-freezer, a valve housing having one inlet port normally communicating with a valve chamber and first and second outlet ports B, C opening on a bottom face of the valve chamber, a valve body 17 rotatably provided in the valve chamber and having a partition wall portion 20, on its end face facing a bottom face of the valve chamber, to partition the end face into an opening area 18 communicated with the valve chamber and a non-opening area 19 not communicating with the valve chamber, and an electric actuator to steppingly turn the valve body 17 are provided for an electrically operated selector valve used in a refrigerating cycle unit for the refrigerator-freezer, and the position of the valve body 17 is changed by four positions A-D.

Abstract: A refrigerator has a two-stage compressor and means for switching refrigerant flow between a primary channel and a bypassing channel at downstream of a condenser that is connected with an outlet of the two-stage compressor. The primary channel extends from a first exit of the means for switching, through a first capillary tube and a first evaporator, to a gas-liquid separator, a gas-exit of which is connected with a second evaporator through a second capillary tube. The bypassing channel extends from a second exit of the means for switching, through a bypass capillary, to the gas-liquid separator. When flow of refrigerant in the second evaporator is substantially interrupted and so detected, refrigerant flow is switched to the bypassing channel, by means for controlling.

Abstract: A refrigerant cycle has a main expansion valve communicating with an inlet header which in turn communicates with a plurality of flow passages moving towards an evaporator coil. Each of the plurality of passages is provided with an individual restriction which provides additional expansion. The individual restrictions can each be separately controlled or designed such that the flow through each of the passages can be tailored to optimum efficiency and operation within the evaporator coil. However, the use of the main expansion valve in series with these restrictions ensures that each of the restrictions can be relatively simple items. Further, the use of the separate restrictions provides a system which has a simplified inlet header system.

Abstract: A refrigerator includes a first passage including a cold storage zone capillary tube and a cold storage zone evaporator, the latter two being connected in series to each other, a second passage including a freezing zone capillary tube and a freezing zone evaporator, the latter two being connected in series to each other, a switching valve causing the refrigerant condensed by the condenser to flow selectively through any one of the first passage, the second passage and both the first and second passages, a variable speed, cold storage zone fan circulating air in the cold storage zone while the air is in contact with the cold storage zone evaporator, a variable speed, freezing zone fan circulating air in the freezing zone while the air is in contact with the freezing are evaporator, and a control device switching the switching valve upon power supply to the refrigerator so that the refrigerant flows simultaneously through both the first and second passages, starting the compressor, starting the cold storage zon

Abstract: System and method for reducing temperature variation among heat dissipating components in a multi-component computer system. In this respect, component temperatures are controlled to remain relatively constant (approximately within 5° C.) with respect to other components, while allowing for multiple fluctuating heat loads between components. A refrigeration system possessing a variable speed compressor or a constant speed compressor is utilized to control the flow of refrigerant through the refrigeration system. The temperature variation among components is reduced by independently metering the mass flow rate of the refrigerant flowing into each component to compensate for the amount of heat load on each component. In this respect, the mass flow rate of the refrigerant entering into each of the evaporators is metered by valves located upstream from each of the evaporators.

Abstract: A refrigerator has a two-stage compressor and means for switching refrigerant flow between a primary channel and a bypassing channel at downstream of a condenser that is connected with an outlet of the two-stage compressor. The primary channel extends from a first exit of the means for switching, through a first capillary tube and a first evaporator, to a gas-liquid separator, a gas-exit of which is connected with a second evaporator through a second capillary tube. The bypassing channel extends from a second exit of the means for switching, through a bypass capillary, to the gas-liquid separator. When flow of refrigerant in the second evaporator is substantially interrupted and so detected, refrigerant flow is switched to the bypassing channel, by means for controlling.

Abstract: A refrigerant distributor of a refrigerating cycle for a heat pump of the present invention comprising a compressor for compressing a refrigerant and discharging the refrigerant variably, a distributor for distributing the refrigerant passed through an expansion device expanding the refrigerant to a plurality of branching pipes and making the refrigerant flow to a evaporator including a plurality of blocks, a refrigerant flow controller installed on a certain branching pipe of the distributor for opening/closing the flow of the refrigerant to the branching pipes, and a by-pass pipe for making a certain amount of the refrigerant discharged variably from the compressor flow to the refrigerant flow controller by connecting the discharge side of the compressor and refrigerant flow controller so as to open/close the certain branching pipe of the distributor by the operation of the refrigerant flow controller in accordance with the discharge compressor of the refrigerant discharged variably from the compressor is c

Abstract: In a refrigerator using a evaporator, and particularly in an apparatus and a method for controlling a refrigerating cycle of a refrigerator which is capable of easily switching a three-way stepping motor valve, by adjusting a flow of a refrigerant in a refrigerating cycle by using a three-way stepping motor valve, noise occurred in the conventional valve switching can be reduced, a power consumption of a three-way stepping motor valve can be reduced.

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 low-cost and thermodynamically efficient implementation of a two-stage refrigeration system applied to a retail refrigerator. The invention includes a simple and easily manufactured thermally efficient and low-cost evaporation unit. The invention further includes a thermal energy storage module and an energy efficient control protocol to maintain steady temperatures in the fresh and frozen food sections, to permit energy efficient defrosting of the heat exchange surfaces in the freezer section, and minimize losses associated with condensing unit on-and-off cycling.

Abstract: The object of this invention is to provide an air conditioning system with low compression load. This air conditioning system consists of an expansion unit for adiabatically expanding refrigerant, an indoor unit having a heat exchanger, a compressor for adiabatically compressing the refrigerant, and an outdoor unit having a heat exchanger, and circulates refrigerant through the compressor, outdoor unit, expansion unit, and indoor unit to heat or cool a target area using the phase change of the refrigerant.

Abstract: An air conditioning unit comprises a conventional refrigeration circuit including a conventional primary capillary for reducing the pressure of refrigerant flowing from a condenser outlet to an evaporator inlet. During abnormal operating conditions, i.e., when outside temperature is above a predetermined value, a secondary pressure reducing capillary bypasses the evaporator to supply refrigerant flowing out of the condenser to an inlet of a compressor, also responsive to refrigerant flowing out of the evaporator. Refrigerant flowing from the compressor flows into the condenser.

Abstract: A circuit configuration operates an electrically triggerable magnet valve having a valve-control element adjustable into at least two working positions for selecting one fluid-flow path at a time to be acted upon by a fluid and corresponding to a respective working position. The circuit configuration includes a device for adjusting the valve-control element into a different working position in connection with an imposition of fluid, predominantly present in liquid components, on at least a portion of a fluid-flow path formed by the magnet valve. A refrigeration appliance, in particular a refrigerator or freezer or a combination refrigerator-freezer includes the circuit configuration.

Abstract: There is disclosed a multi-stage compressing refrigeration device for multi-stage compressing a refrigerant using a plurality of compressing means. Its object is to enhance reliability, intend to reduce input and improve refrigeration effect, and to enhance efficiency. In the multi-stage compressing refrigeration device, low-stage compressing means and high-stage compressing means, a condenser, first expanding means, an intermediate evaporator, second expanding means and a main evaporator constitute a refrigeration cycle. The refrigerant flowing out of the condenser is branched into one refrigerant passed to the intermediate evaporator via the first expanding means and the other refrigerant passed to the main evaporator via the second expanding means. Heat exchange is performed between the refrigerant flowing into the second expanding means and the intermediate evaporator.

Abstract: A refrigerator-freezer includes a first evaporator cooling an atmosphere in a refrigerating compartment, a second evaporator cooling an atmosphere in a freezing compartment and a controller controlling a switching valve in a refrigerating cycle so that a cooling operation is switched between a first operation mode in which refrigerant compressed by a compressor is supplied at least to the first evaporator and a second operation mode in which the refrigerant compressed by the compressor is supplied at least to the second evaporator. The controller stops the compressor when a temperature in either one of the refrigerating and freezing compartments for which the cooling operation is unexecuted is below a predetermined upper limit temperature in a case where a temperature in the other compartment for which the cooling operation is in progress drops to a predetermined lower limit temperature.

Abstract: A multi-section evaporator is employed in a heat pump system which includes a compressor, a condenser and an evaporator. A control valve is connected between each adjacent set of evaporator sections and the control valve is operable in response to temperature and/or pressure conditions sensed by a sensor. In response to a sensed condition, one or more sections of the evaporator are brought into operation concurrently with the previously operating section(s). Thus, the effective size of the evaporator is variable depending on the sensed condition.

Abstract: The invention provides a battery cooling system to cool an electric vehicle battery pack and extend the operating range of an automotive heat pump system. Waste heat from the battery pack is transferred to a secondary coolant system thereby cooling the battery pack. A secondary heat exchanger is coupled between the secondary cooling system and a reversible HVAC system. The secondary heat exchanger transfers the secondary coolant system heat energy to the reversible HVAC system. The heat energy transferred to the reversible HVAC system supplements the existing stored energy thereby extending the heating mode operating range of the HVAC system. The requirement for supplemental electric heating is reduced, further increasing the electric vehicle energy efficiency.

Abstract: The present invention provides an improved beverage chiller comprising at least two interconnected canisters each canister defining a chamber for refrigerant. The chamber includes a plurality of pipes extending along the length of the chamber for the flow of beverage thereghrough. Each canister includes flow control means to ensure flow of beverage up and down the refrigerant chamber in a plurality of cooling passes. The refrigerant chambers are pressure balanced and arranged to be coupled to a source of refrigeration via a thermostatic expansion valve.

Abstract: An arrangement is provided for insuring that excessive demand is not placed on a refrigeration unit that supplies pressurized subcooled refrigerant to different channels having independent needs for use of refrigeration capacity. A separate reference channel receives a portion of the refrigerant and expands the refrigerant fully to a gas phase to establish a minimum level reference temperature. In the operative channels the refrigerant flows into individual evaporators/heat exchangers at rates set by external command signals, the refrigerant being in heat exchange relation with thermal transfer fluid in the evaporator/heat exchanger. Evaporation of refrigerant in each channel thus brings the thermal transfer fluid for that channel to the target temperature. By comparing the post evaporation temperature in each channel to the reference temperature, and reducing the refrigerant flow rate whenever the difference is below a threshold, individual channels are not overtaxed and the system remains stable.

Abstract: An air conditioning system including a refrigeration system with two evaporators having dissimilar heat transfer surfaces which combine to produce a cooling effect. The first evaporator includes a first heat transfer surface with a high efficiency or heat rejection (heat absorption) rate which is optimally configured for use in an environment having a low humidity level. The second evaporator includes a second heat transfer surface with a lower efficiency or lower heat rejection (heat absorption) rate as compared to the first heat transfer surface but which performs better in environments having higher humidity levels. Refrigerant to the first and second evaporators is controlled for a given ambient air humidity level to attain maximum efficiency. A cooling method for a refrigeration system is also provided.

Abstract: An energy management system is disclosed that includes first, second and third heat exchangers, a compressor to provide compressed refrigerant for selective delivery to the heat exchangers, an expansion valve for the first and second heat exchangers for selectively delivering expanding refrigerant thereto, and a control valve communicating with the heat exchangers, expansion valves and compressor.

Abstract: An air conditioner for a vehicle includes a heat pump system for heating and cooling. The air conditioner includes a ventilation passage for ventilating air from a passenger compartment of the vehicle outside of the vehicle. An accelerating system is provided with the heat pump system for accelerating the evaporation of a refrigerant during air cooling or the condensation of a refrigerant during air heating by using involved energy recovered from air exhausted outside of said vehicle through the ventilation passage. Thereby, the air conditioner increases the heating and cooling ability and reduces the energy necessary for maintaining a constant temperature in the passenger compartment.

Abstract: A unique method of operating a refrigeration system for rapidly pulling down a refrigerated container temperature includes the use and algorithm for operating several system components. The refrigeration system is preferably provided with a suction modulation valve, a compressor unloader and an economizer circuit. By utilizing each of these components in combination with one another, and at various stages during the pull down capacity and energy efficiency of the refrigeration system are optimized, while maintaining the system operation within preset limits.

Abstract: The expanded flow through a heat exchanger type economizer is controlled by an electronic expansion valve and is supplied to the motor of a motor compressor to cool the motor. The electronic expansion valve is controlled by a microprocessor responsive to the temperature of the motor winding sensed by a thermistor.

Abstract: A multi-unit air conditioner has a compressor for compressing refrigerant, an outdoor heat-exchanger for receiving compressed refrigerant from the compressor, and a plurality of indoor heat-exchangers connected in parallel with the outdoor heat-exchanger for receiving heat-exchanged refrigerant therefrom. A by-pass section is provided for returning some of the refrigerant from the outdoor heat-exchanger back to the compressor inlet when one of the indoor heat-exchangers is inactive, to restrict the amount of refrigerant supplied to the active indoor heat exchanger.

Abstract: A main evaporator cools a driver's compartment of a vehicle while a cooling storage evaporator cools cooling storage packs that are used in cooling a sleeping compartment. Refrigerant is supplied to the main evaporator at the actuation of a first solenoid valve while refrigerant is supplied to the cooling storage evaporator at the actuation of a second solenoid valve. If a first switch is being actuated after the completion of the cooling storage operation of the cooling storage evaporator on the cooling storage packs and the temperature of the cooling storage packs is no more than a preset temperature, for example, -5.degree. C., FIR control is performed for alternately actuating the first solenoid valve and the second solenoid valve based on a predetermined time ratio (for example, 10 minutes 15 seconds).

Abstract: A pipe freezing apparatus 2 has pipe freezer heads 12a, 12b supplied with refrigerant by a compressor 4. The freezer heads 12a, 12b comprise expansion chambers in which the refrigerant expands, to cool the heads. A valve 10 alternately diverts flow of the refrigerant to the freezer heads 12a, 12b. When a supply to a head 12a, 12b is shut off, the compressor lowers the pressure in the head, resulting in enhanced cooling when supply to the head is restored. The compressor 4 can be run continuously while the cooling at the heads is controlled.

Abstract: A device for cooling a motor vehicle interior (2) has a first refrigerant loop with a compressor (8), condenser (10), and at least a first evaporator (13). The device furthermore has a second refrigerant loop with at least one more evaporator which is joined to an ice reservoir to form a structural unit (17, 19, 21) and which can be connected in parallel to the first evaporator (13) by at least one valve (15). To enable simple and comfortable static climate control, the structural unit (17, 19, 21) is located as a flat element in at least one wall (4, 3, 5) of the motor vehicle interior and can be brought into a direct heat-transfer connection to the air of the motor vehicle interior.

Abstract: A refrigerating cycle apparatus for averting shortages of its refrigerant in a refrigerating cycle and of oil reflux regardless of fluctuations in the progress of freezing in a cold accumulating material. In operation, two solenoid valves are opened and a compressor is activated. The activated compressor causes stagnant refrigerant inside a cold accumulating evaporator to be collected into a receiver. Thereafter, one solenoid valve is closed to let the refrigerant flow only to the cold accumulating evaporator. This makes it possible to circumvent shortages of the refrigerant in the refrigerating cycle and of oil reflux irrespective of varying progress in the freezing status of the cold accumulating material.

Abstract: An air conditioner comprises a freezing cycle circuit, which includes, successively provided on a main duct line 11 in the mentioned order, a compressor 10, a four-way valve 12, an external heat exchanger 13, a pressure reducer 14, and an internal heat exchanger 11, the main duct line 11 branching into at least an upper and a lower part coolant flow line 20 and 30 in the internal heat exchanger 15, and an on-off valve 10 provided on the upper part coolant flow line 20 and closed in a low capacity cooling operation. The air conditioner can gently cool and gently dry air in a room without causing chillness to be felt.

Abstract: A cooling system with super heating control for a vapor degreasing apparatus is provided. The cooling system consists of a single condenser receiving a substantially gaseous refrigerant and producing a substantially liquid refrigerant. A first chilling coil evaporates at least a portion of the substantially liquid refrigerant which results in heat absorption by the first chilling coil at a first absorption rate. A second chilling coil evaporates at least a portion of the substantially liquid refrigerant resulting in heat absorption by the second chilling coil at a second absorption rate, and a desuperheating system, connected to the first and second chilling coils and the condenser, controlling the temperature of the substantially gaseous refrigerant generated by the first and second chilling coils and received by the condenser.

Abstract: An air-conditioning apparatus forms a refrigerating cycle with a refrigerant heater and a compressor having two cylinders. The apparatus simultaneously carries out a refrigerant heating operation and a heat pump operation when a required heating capacity is high, and when the required heating capacity is low, only the heat pump operation. This operation technique helps reduce the size of the apparatus and expand a variable width of heating capacity. The apparatus also has a defrosting unit for defrosting an outdoor heat exchanger during the heat pump operation.

Abstract: The waste heat from a heating part mounted on a vehicle is recovered and extracted by a refrigerant for gas injection so that the heating capacity at a low ambient temperature may be effectively improved while suppressing an increase in the power consumption. At the heating time, the refrigerant is circulated in a closed circuit composed of a compressor, an indoor heat exchanger, a pressure regulator and an outdoor heat exchanger, and the refrigerant, as condensed in the indoor heat exchanger, is regulated to an intermediate pressure by a pressure regulator and introduced into a heat exchanger. In this heat exchanger, the refrigerant extracts the heat from the heating part at the side of the vehicle so that it evaporates. The refrigerant thus having evaporated is introduced through an evaporation pressure regulating valve via a gas injection passage into a gas injection port of the compressor.

Abstract: According to the present invention, in an expansion valve integrated with a electromagnetic valve, there are provided an inlet refrigerant path, a restriction path for decompressing and expanding the refrigerant from the inlet refrigerant path, a valve element for adjusting an opening degree of the restriction path, a diaphragm operating unit, and an outlet refrigerant path for supplying the refrigerant decompressed and expanded in the restriction path to an evaporator. The outlet refrigerant path is opened or closed by the electromagnetic valve 200. When the electromagnetic valve 20 is closed, the diaphragm operating unit operates to close the valve element in the restriction path, based on the refrigerant pressure between the valve element of the electromagnetic and the restriction path. In this way, it is possible to reduce the noise of the refrigerant when the electromagnetic valve is closed.

Abstract: An improvement for a refrigeration system that includes a refrigerant circuit and a compressor with condenser assembly. The improvement is a pre-cooling device connected to the output of the condenser and includes an inlet and two outlets. The inlet is connected to a serpentine at one end and the other end is connected to one of the outlets. The other outlet is connected to the device housing above the bottom concavity where the liquid refrigerant is collected. The serpentine comes in at least partial contact with the refrigerant and in that manner pre-cooling the refrigerant going through the serpentine.

Abstract: A phase separator of a time shared dual evaporator cycle refrigerator includes an attachment unit formed at the end of a suction pipe and a cap formed at the attachment unit which prevents a flow of liquid refrigerant into a compressor. The liquid refrigerant which is flowing into a refrigerator compartment evaporator is expanded in a second capillary tube to be evaporated in a freezer compartment evaporator, and is then returned into the compressor. A refrigerant controlling unit determines the path of the refrigerant.

Abstract: An air cooling and control system for a refrigerated food merchandiser having an insulated cabinet with a product are having adjacent product zones, plural modular evaporator coil sections of substantially equal heat exchange potential and being of predetermined length and arranged in horizontal, spaced, end-to-end predetermined disposition and separate air moving means associated with each coil section and a corresponding product zone for circulating separate air flows through the coil sections and to the product area for cooling. The system further includes a first refrigerant metering valve for controlling liquid refrigerant flow on the high side of the evaporator sections, and a second refrigerant metering valve for controlling suction pressure and refrigerant vapor flow on the low side of the evaporator sections. An electronic control senses exit air temperatures downstream of the evaporator sections and operates the second metering valve in response thereto.

Abstract: A heat energy transfer system including a refrigeration loop with a heat transfer engine connected in series with a condenser, a thermal expansion valve and an evaporator has associated with the evaporator a heat exchanger that is coupled in circuit with a container of water or other-suitable heat transfer fluid. The warmer fluid proximate the top of the container is drawn off and fed through the heat exchanger and returned to the bottom of the container. The thus chilled fluid can be pumped to utilization devices again with the colder fluid at the bottom of the buffer or container being pumped to the utilization device and returned, after warming, to the top of the container. An auxiliary closed exchange loop may also be incorporated to supply heat energy needs to the evaporator of the refrigeration loop in the event that the cold buffer contents are chilled to the point where insufficient heat energy is contained in it to provide evaporization of the refrigerant before being fed to the heat transfer engine.

Abstract: A "DX" heat pump is provided herein which is based on the principle of providing optimal heat exchange in the heating mode through at least two, but up to five or more parallel ground loops, all but one of which respectively can be cut off from the system and evacuated of refrigerant in the cooling mode, and selectively reintroduced as required in the cooling mode. The loops are designed in terms of volume so that the refrigerant charge is correct in the heating mode when split in the selected number of loops and also correct in the cooling mode when one or more loops are used, whereby it/they contain the full system refrigerant charge. The headers are provided with solenoid valves which can be individually operated to provide a staged cooling system.

Abstract: A low volume inlet reciprocating compressor suitable for use in a dual evaporator refrigeration cycle. The compressor includes a cylinder having an inlet port and an outlet port disposed in a housing. A flexible conduit having an inlet passage formed therein extends between the inlet port and an inlet in the housing, and a check valve is connected to the inlet passage so as to prevent refrigerant flow out of the conduit. The inlet passage is located as close as possible to the inlet port. A suction muffler can be located in the housing with one end connected to a second inlet in the housing and another end connected to the check valve. A discharge tube is provided between the outlet port and outlet opening in the housing.

Abstract: A vapor compression refrigeration system for providing cold storing which; during a conventional cycle provides cooling to an indoor heat exchanger in the conventional fashion, during a cooling charging cycle refrigeration effect is stored in a heat storage vessel by refrigerant evaporation with the indoor heat exchanger being by-passed and during a discharging cooling cycle refrigerant passes through the heat storage vessel without evaporation and evaporates in the indoor heat exchanger to provide space cooling.

Abstract: An air cooling and control system for a refrigerated food merchandiser having an insulated cabinet with a product area having adjacent product zones, plural modular evaporator coil sections of substantially equal heat exchange potential and being of predetermined length and arranged in horizontal, spaced, end-to-end predetermined disposition and separate air moving means associated with each coil section and a corresponding product zone for circulating separate air flows through the coil sections and to the product area for cooling. The system further includes a first refrigerant metering valve for controlling liquid refrigerant flow on the high side of the evaporator sections, and a second refrigerant metering valve for controlling suction pressure and refrigerant vapor flow on the low side of the evaporator sections. An electronic control senses exit air temperatures downstream of the evaporator sections and operates the second metering valve in response thereto.