Abstract: A heat generating body box housing refrigeration device includes a first refrigerant cycle in which a first condenser and a first evaporator are connected by a first refrigerant liquid pipe and a first refrigerant steam pipe and a second refrigerant cycle in which a second condenser and a second evaporator are connected by a second refrigerant liquid pipe and a second refrigerant steam pipe. The first refrigerant liquid pipe is connected between a first joint and a second joint, the first refrigerant steam pipe is connected between a third joint and a fourth joint, the second refrigerant liquid pipe is connected between a fifth joint and a sixth joint, and the second refrigerant steam pipe is connected between a seventh joint and an eighth joint.

Abstract: A high efficiency air conditioning and refrigeration system and cycle comprises a vapor compressor and two independent ejectors operatively connected to high and low-pressure sides of the compressor, respectively. The two ejectors reduce the overall pressure ratio of the mechanical vapor compressor resulting in dramatically increased thermodynamic cycle efficiency. As one example of its potential applications for residential, commercial or industrial uses, a 150 ton capacity of a water-cooled chiller designed in accordance with the present invention is predicted to provide the power consumption as low as 0.47 kW/ton, when operated in accordance with the cooling methods of the present invention, which corresponds to 7.47 of Coefficient of Performance (COP).

Abstract: A two-stage air source heat pump having an extended operational temperature range combines intercooling, regeneration, and inter-stage vapor recirculation. Cooling a working gas in between the lower and higher-pressure stages decreases the work required to compress the working gas. The entire system may be computer controlled using sensors to monitor flows, temperatures, and pressures in and around the system.

Abstract: The present invention relates to a cascade refrigeration system which circulates a refrigerant comprising a fluoroolefin therethrough. The cascade refrigeration system includes a low temperature refrigeration loop and a medium temperature refrigeration loop. The fluoroolefin circulates through either loop, or both. In a particular embodiment, the fluoroolefin circulates through the medium temperature loop. In a particular embodiment, where the cascade refrigeration system includes a first and a second cascade heat exchanger, and a secondary heat transfer loop which extends between the first and second cascade heat exchangers, either the first and/or second refrigerant may be, but need not necessarily be, a fluoroolefin.

Abstract: A dual refrigeration circuit, watercooled chiller has its respective evaporators and condensers interconnected by waterboxes, with each waterbox having an inlet flow and outlet flow connection, and with three passages interconnected with the respective evaporators/condensers of the first and second circuit, and with each of the condensers/evaporators having return bends at their ends to provide a two-pass flow arrangement. The flow in the condenser waterbox passes into a first passage and then in one direction to the condenser of one circuit while the flow into the evaporator waterbox passes into a first passage and then in the opposite direction to one of the circuit evaporators. In this manner, a series counterflow arrangement with two water passes is achieved.

Abstract: A system (20) for conditioning air (30) includes conditioning circuits (26, 28). Each of the circuits (26, 28) includes a heat transfer coil (54, 60) residing in a supply section (22) of the system (20), and a heat transfer coil (56, 62) residing in a return section (24) of the system (20). A controller (50) in communication with the circuits (26, 28) determines one of a heating mode (78, 110) and a cooling mode (148, 150) for an interior space (34). The controller (50) selectively actuates the conditioning circuits (26, 28) to condition outside air (30) entering the supply section (22) to produce conditioned supply air (36) for provision into space (34) and to recover heating and cooling energy from return air (38) entering the return section (24) from the space (34) prior to its discharge from the system (20) as exhaust air (44).

Abstract: A distributed refrigeration appliance system in a residential kitchen and other locations in a dwelling including multiple separate refrigeration appliance modules, a central cooling system and a cooling circuit. The system can also include one or more satellite stations having a heat exchanger and arranged for supplying chilled air to one or more refrigeration appliance modules. One or more refrigeration appliance modules can include a thermal cascade cooling device to cool the module to lower temperatures than the cooling circuit can attain. One or more refrigeration appliance modules can be refrigeration/storage modules that can provide refrigerated, unconditioned or heated storage space. The central cooling system can be a vapor compression system having a refrigerant circuit connecting the modules. Alternately, the central cooling system can cool a secondary cooling medium circuit.

Abstract: A cooling device is provided having three storage zones that are insulated from each other and cooled via evaporators through which a coolant flows. A first coolant circuit extends through a first and a second of the three storage zones and a second coolant circuit positioned parallel to the first coolant circuit extends through the first and the third of the storage zones.

Abstract: Embodiments of systems, apparatus, and/or methods can provide a damper assembly for transport refrigeration systems. One embodiment can include a damper assembly including a damper door configured to operate in a first position (e.g., closed), a second position (e.g., open), and at least one intermediate position. In one embodiment, a plurality of intermediate positions can be used to controllably vary a capacity of the transport refrigeration unit, or at least one component thereof. Embodiments of systems, apparatus, and/or methods can provide a damper assembly that can be accessed though an ambient portion of transport refrigeration systems or components.

Abstract: A cascade refrigeration system includes an upper portion having at least one modular chiller unit that provides cooling to at least one of a low temperature subsystem having a plurality of low temperature loads, and a medium temperature subsystem having a plurality of medium temperature loads. The modular chiller unit includes a refrigerant circuit having at least a compressor, a condenser, an expansion device, and an evaporator. An ammonia refrigerant mixed with a soluble oil circulates within the refrigerant circuit. A control device may be programmed to modulate the position of the expansion device so that a superheat temperature of the ammonia refrigerant near an outlet of the evaporator fluctuates within a substantially predetermined superheat temperature range to positively return soluble oil from the evaporator to the compressor.

Abstract: A thermal cycling system includes a structure defining a load space, a heating assembly positioned to heat to the load space, and a cooling assembly positioned to cool the load space. The cooling assembly includes a refrigeration circuit and a banking circuit. The refrigeration circuit has a compressor, a refrigeration condenser, a first refrigeration evaporator in direct thermal communication with the load space, a second refrigeration evaporator in parallel with the first evaporator, and primary refrigerant circulating throughout the refrigeration circuit. The banking circuit is gravity fed and includes a banking condenser, a banking evaporator positioned to cool the load space, and a banking refrigerant circulating throughout the banking circuit. The banking condenser includes a collection reservoir to store liquid banking refrigerant and is in thermal communication with the second refrigeration evaporator.

Abstract: The present invention relates to a heat exchanger comprising at least one first loop adapted to trap energy from a source. The first loop contains a first refrigerant adapted to collect energy from a source. The invention also comprises at least one second loop with a second refrigerant adapted to interact with the first refrigerant and to transfer to a user a maximum quantity of the energy trapped by the first loop in the most efficient manner. The transfer of the trapped energy takes place in a transfer unit placed in the second loop. The transfer unit comprises an outer cylinder with an inlet and an outlet adapted to circulate the first refrigerant. An inner coil placed within the outer cylinder to contain the second refrigerant. The inner coil is provided with an inlet and outlet adapted to facilitate circulation of the second refrigerant.

Abstract: A distributed refrigeration appliance system for use in a residential kitchen and other locations in a dwelling and includes multiple separate refrigeration appliance modules, a central cooling system and a cooling circuit. The system can also include one or more satellite stations having a heat exchanger and arranged for supplying chilled air to one or more refrigeration appliance modules. One or more refrigeration appliance modules can include a thermal cascade cooling device to cool the module to lower temperatures than the cooling circuit can attain. One or more refrigeration appliance modules can be refrigeration/storage modules that can provide refrigerated, unconditioned or heated storage space. The central cooling system can be a vapor compression system having a refrigerant circuit connecting the modules. Alternately, the central cooling system can cool a secondary cooling medium circuit.

Abstract: A novel central cooling and circulation energy management control system is provided, including an energy management controller device, a central cooling system, and associated methods, according to various embodiments. In one illustrative embodiment, a central cooling energy management controller device includes one or more signal connections, one or more electronic memory elements, and one or more processors. The controller device has access to resources that are either stored on the electronic memory elements or are accessible via the signal connections. The resources include an equipment data table, an equipment and operational configuration table, an operational efficiency matrix, and executable instructions.

Abstract: In accordance with an embodiment of the invention, there is provided a system for cooling a load.

Abstract: A system including a primary evaporator facilitating heat transfer by evaporating liquid to obtain vapor is disclosed. The primary evaporator receives a liquid from a liquid line and outputs the vapor to a vapor line. The primary evaporator also outputs excess liquid received from the liquid line to an excess fluid line. A condensing system receives the vapor from the vapor line, and outputs the liquid and excess liquid to the liquid line. The excess liquid is obtained at least partially from a reservoir. A primary loop includes the condensing system, the primary evaporator, the liquid line, and the vapor line, and provides a heat transfer path. Similarly, a secondary loop includes the condensing system, the primary evaporator, the liquid line, the vapor line, and the excess fluid line. The secondary loop provides a venting path for removing undesired vapor within the liquid or excess liquid from the primary evaporator.

Abstract: The present invention relates to a dual air conditioner for a vehicle, which includes a rear high-temperature pipe that is connected to a rear expansion valve of a rear air conditioner and installed in such a way as to be directly branched from a dual pipe type internal heat exchanger of a front air conditioner, thereby reducing the number of required components and simplifying the manufacturing process with no need to use a connector for branching the rear high-temperature pipe from the front air conditioner, and enhancing a refrigerant movement and reducing material expenses and working process by simplifying piping work and a piping route.

Abstract: A two-stage cascade refrigeration system is provided having a first refrigeration stage and a second refrigeration stage. The first refrigeration stage defines a first fluid circuit for circulating a first refrigerant, and has a first compressor, a condenser, and a first expansion device that is in fluid communication with the first fluid circuit. The second refrigeration stage defines a second fluid circuit for circulating a second refrigerant, with the second refrigeration stage having a second compressor, a second expansion device, and an evaporator that is in fluid communication with the second fluid circuit. A heat exchanger is in fluid communication with the first and second fluid circuits to exchange heat between the first and second refrigerants. At least one of the first or second compressors is a variable speed compressor.

Abstract: A cascade cooling system that uses low-grade thermal and other energy input sources to provide refrigeration and air conditioning in stationary and mobile applications. A two-loop embodiment includes a heat-powered first loop incorporating a vapor-jet compressor and a second loop based on a mechanical compressor powered by an electric motor or other source of rotational torque. The system uses waste heat, solar thermal or a fuel-fired heat source to partially or fully offset mechanical/electrical energy input. The system can also operate entirely on thermal, electrical or mechanical input. The ability to use multiple energy sources in any combination maximizes energy efficiency, performance and reliability. The system is well suited to making beneficial use of waste heat in vehicle applications. In stationary applications, solar thermal and/or waste heat from industrial processes can be used to improve the efficiency of conventional cooling systems.

Abstract: In order to improve a refrigerating plant, comprising a refrigerant circuit, with a high-side refrigerant-cooling heat exchanger, with an expansion cooling device, with a reservoir for the main mass flow, with at least one normal cooling stage, with an intense cooling stage, which removes an overall intense cooling mass flow from the reservoir, and with at least one refrigerant compressor unit, which is disposed in the refrigerant circuit, in such a way that it has a better efficiency, it is proposed that the intense cooling stage has for further cooling of the overall intense cooling mass flow an intense cooling expansion cooling device, which in the active state cools the overall intense cooling mass flow and thereby produces a main intense cooling mass flow, which is fed to the intense cooling expansion element, and an additional intense cooling mass flow.

Abstract: The present invention proposes a thermal generator which is non-polluting, has very good energy efficiency, is of simple and economical design and uses little energy, at the same time as being capable of further development, flexible and modular. In this thermal generator (1), the thermal elements (3) composed of magneto-calorific material each comprises two separate collector circuits (31 and 32), a “hot” collector circuit connected to a hot heat transfer fluid circuit (51) and a “cold” collector circuit (32) linked to a cold heat transfer fluid circuit (52). The heat transfer fluid is made to move alternately in one or the other of the collector circuits (31 and 32) depending on whether or not the thermal elements (3) are subjected to the magnetic field generated by the magnets (40) moving in rotation around a central axis (B) with respect to the thermal elements (3).

Abstract: Climatic test chamber (10) for carrying out a sequence of specified test cycles and cooled by means of at least a refrigerating circuit (100, 200, 410) including a variable-speed compressor (120, 210, 410). During the steps of the test cycles in which said chamber (10) is held at a minimum set temperature, the compressor (120, 210, 410) operates at the minimum rotating speed thereof and the refrigeration capacity is used to cool a cold storage medium. The cold stored by the cold storage medium is then recovered to subcool the refrigerant medium during the cooling-down steps in which the compressor (120, 210, 410) operates at the maximum rotating speed thereof.

Abstract: A heat pump system has a single heat source unit connected to at least one load unit to heat water to a high temperature. A hot water supply system 100 (heat pump system) includes a heat source unit 10 provided with a first compressor 11, a four-way selector valve 12 and a heat source heat exchanger 13, and a load unit 50 provided with a first flow controller 51, a first load heat exchanger 52, a second compressor 53, a second load heat exchanger 54, and a second flow controller 55. A main circuit A is formed by connecting the first compressor 11, the four-way selector valve 12, the heat source heat exchanger 13, the first flow controller 51 and the first load heat exchanger 52 with a liquid pipe 1 and a gas pipe 2 sequentially. A load refrigerant circuit B is formed by connecting the second compressor 53, the second load heat exchanger 54, the second flow controller 55, and the first load heat exchanger 52 with a load refrigerant pipe line 56 sequentially.

Abstract: An ammonia/CO2 refrigeration system is provided in which the ammonia cycle and CO2 brine cycle can be combined without problems even when refrigeration load such as refrigerating showcase, etc. is located at any place in accordance with circumstances of customer's convenience. The system comprises apparatuses working on an ammonia refrigerating cycle, a brine cooler for cooling and condensing CO2 by utilizing the latent heat of vaporization of the ammonia, and a liquid pump provided in a supply line for supplying the cooled and liquefied CO2 to a refrigeration load side cooler, wherein said liquid pump is a variable-discharge pump for allowing CO2 to be circulated forcibly, and the forced circulation flow is determined so that CO2 is recovered from the outlet of the cooler of the refrigeration load side in a liquid or liquid/gas mixed state.

Abstract: An air conditioning system for communication equipment. An indoor module has expansion valves installed on refrigerant pipes, brine coolers each having heat exchange tubes to which the refrigerant pipe extending from each expansion valve and a separate brine pipe are connected, compressors for compressing refrigerant, an indoor heat exchanger having a heat exchange tube to which the brine pipe extending from the brine coolers is connected, and an indoor blower. An outdoor module has circulation pumps connected in parallel to the brine pipe extending from the indoor heat exchanger, outdoor heat exchangers connected in series with each other while facing each other and each having a heat exchange tube to which the brine pipe extending from the circulation pumps is connected, condensers facing each other and having tubes to which the refrigerant pipes extending from the compressors are connected in parallel, and an outdoor blower.

Abstract: The present invention proposes a water circulation system associated with a refrigerant cycle that can selectively heat-exchange water for cooling and heating and hot water supplying with at least one of a first refrigerant and a second refrigerant. Therefore, the present invention can improve the operation efficiency of the water circulation system associated with the refrigerant cycle.

Abstract: The present invention relates to a water circulation system associated with a refrigerant cycle that includes an intermediate heat exchanger having a triple-pipe shape in which three independent flow passages are formed by three pipes having a concentric axis and different diameters. Accordingly, according to an embodiment of the present invention, three fluids can exchange heat with each other at the same time through the intermediate heat exchanger and the heat exchange capacity of the intermediate heat exchanger can selectively be varied.

Abstract: The present invention relates to an aircraft cooling system evaporator arrangement (10) with at least two mutually independent circuits (20a, 20b) for a coolant, at least two evaporation devices (12a, 12b) arranged to be hydraulically parallel for enabling an exchange of heat between the coolant and a refrigerant, at least two supply lines (18a, 18b) for supplying refrigerant to the evaporation devices (12a, 12b), and at least two discharge lines (22a, 22b) for discharging refrigerant from the evaporation devices (12a, 12b). One of the evaporation devices (12a, 12b), one of the supply lines (18a, 18b) and one of the discharge lines (22a, 22b) is assigned to each coolant circuit (20a, 20b).

Abstract: Various embodiments are directed to multistage pulse tube coolers. In some embodiments, one or more stages of the pulse tube cooler may comprise a control valve positioned between the hot end of the pulse tube and the reservoir. Also, in various embodiments, one or more inter-stage control valves may be positioned between the pulse tubes of consecutive stages.

Abstract: A dual turbo centrifugal chiller includes: first and second evaporators connected in series or in parallel; first and second condensers connected in series or in parallel; and first and second compressors including impellers, wherein cold water passes through the second evaporator after passing through the first evaporator, and cooling water passes through the second condenser after passing through the first condenser, the first compressor containing a refrigerant connects the first condenser to the second evaporator, and the second compressor containing a refrigerant connects the second condenser to the first evaporator, and the impellers of the first compressor and second compressor are rotated simultaneously using a single driving unit.

Abstract: An integrated air conditioning system having a first air conditioning unit having a first evaporator with a first input and a first output; a second air conditioning unit having a second evaporator with a second input and a second output; a first conduit fluidly connecting the first input with the second output; a second conduit fluidly connecting the second input with the first output. The first and second conduits and the first and second evaporators form a working fluid circuit.

Abstract: A refrigeration system includes a medium temperature subsystem circulating a coolant in a closed loop between at least one medium temperature chiller and at least one medium temperature load and at least one cascade heat exchanger, and a low temperature subsystem circulating a coolant in a closed loop between at least one low temperature chiller and at least one low temperature load. A cooling circuit is provided for circulating a coolant and includes a first pump and a second pump and a fluid cooler and a valve, and interfaces with the medium temperature chiller and the low temperature chiller. The valve is movable to a closed position to define a first flow path and a second flow path, where the first flow path includes the first pump and the medium temperature chiller and fluid cooler, and the second flow path including the second pump and the low temperature chiller and the cascade heat exchanger.

Abstract: An HVAC system having a main circuit and a subcooler circuit. The main circuit includes a main circuit evaporator, a main circuit expansion device, a main circuit condenser and a main circuit compressor connected in a closed refrigerant loop. The subcooler circuit includes a subcooler evaporator, a subcooler expansion device, a subcooler condenser and a subcooler compressor connected in a closed refrigerant loop. The subcooler evaporator is arranged and disposed to exchange heat between liquid refrigerant in the main circuit and the refrigerant in the subcooler circuit to cool the liquid refrigerant in the main circuit prior to entering the main circuit evaporator. The operation of the subcooler circuit provides an increased cooling capacity per unit of a mass flow of cooling fluid through the main circuit condenser and subcooler condenser for the HVAC system with a predetermined design efficiency.

Abstract: A refrigeration system includes a first portion having a primary loop and a secondary loop operably coupled by a first chiller, The primary loop circulates a refrigerant through the first chiller to provide cooling to a coolant in the secondary loop. The secondary loop has a supply portion and a return portion, the supply portion circulates the coolant to one or more temperature-controlled storage devices operating at a first temperature. A second portion has a primary loop and at least one secondary loop operably coupled by the second chiller. The primary loop circulates a refrigerant through the second chiller to provide cooling to coolant in the secondary loop. The secondary loop has a supply portion and a return portion, the supply portion circulates the coolant to one or more temperature-controlled storage devices operating at a second temperature. The return portion of the secondary loop of the first portion and the return portion of the secondary loop of the second portion share a common return header.

Abstract: A triple-pipeline type first outdoor unit 2 provided with a first compressor 20 and a first outdoor heat exchanger 21, a plurality of indoor units 4A to 4D are provided, a second outdoor unit 3 provided with a second compressor 30, a second outdoor heat exchanger 32, and a second expansion valve 33, the first outdoor unit 2 is provided with a first four-way valve 60 that makes a refrigerant discharge pipe 25 of the first compressor 20 and a high-pressure gas pipe 7 capable of communicating with each other and if all the indoor units 4A to 4D perform a cooling operation at the same time, the first four-way valve 60 shuts off the communication between the refrigerant discharge pipe 25 and the high-pressure gas pipe 7, while a third four-way valve 51 is switched so as to connect a gas pipe 35d to the high-pressure gas pipe 7.

Abstract: The present invention relates to a dual centrifugal chiller, and it is an object of the present invention to provide a dual centrifugal chiller which is configured so that a turbo chiller having two compressors, two evaporators and two condensers lowers the head of the compressors, and that the compressors are operated with the same heads. The above object can be accomplished by the provision of a dual centrifugal chiller in which chilled water passes through a first evaporator and then through a second evaporator, cooling water passes through a first condenser and then through a second condenser, a first compressor accommodating a refrigerant connects said first evaporator and said second condenser, and a second compressor accommodating a refrigerant connects said second evaporator and said first condenser.

Abstract: A system for cooling a medium includes a line having coolant flowing therein, and a sub-cooling unit in fluid communication with the line. The sub-cooling unit receives a portion of the coolant diverted from the line to cool coolant flowing in the line. A method of cooling a medium is further disclosed.

Abstract: An appliance includes a compression stage, a condensation stage, and an evaporation stage. The evaporation stage includes a first evaporator for a first refrigerated enclosure and a second evaporator for a second refrigerated enclosure. A first valve in a condensation stage bypass line is openable to allow a supply of refrigerant to bypass the condensation stage during a defrost mode, where a condensation stage bypass line is positioned between an output of the compression stage and the second evaporator. A second valve is positioned in a line from the second evaporator to the input to the compression stage and is closeable to block a supply of refrigerant from the second evaporator to the compression stage during the defrost mode. An additional line positioned between the second evaporator and the first evaporator carries the supply of refrigerant from the second evaporator to the first evaporator in the defrost mode.

Abstract: A refrigerating apparatus for keeping an inside of a storage at a predetermined low-temperature state includes first and second refrigerant circuits including compressors, condensers, decompressors, and evaporators, connected circularly with pipings to form refrigerating cycles, the circuit having a first or second refrigerant sealed therein as a working refrigerant, a first sensor which detects a temperature of a cascade condenser constituted by integrating the evaporator of the first refrigerant circuit and the condenser of the second refrigerant circuit in a heat exchangeable manner, first and second controllers which control operation performances of the first and second compressors in a variable manner based on first and second sensor detected temperatures in order that the first and second sensor detected temperatures are first and second temperatures, respectively, and a second sensor which detects a temperature inside the storage.

Abstract: A modular air conditioning (AC) system including one or more AC modules is provided. The AC modules may be adapted to function individually or cooperatively as part of a modular system. The AC modules may be further adapted to connect in a variety of advantageous ways to facilitate the supply of conditioned air to a variety of downstream applications.

Abstract: A refrigerating apparatus including a first refrigeration cycle circuit having a first compressor, a first radiator, a supercooler, a first pressure-reducing device and an evaporator that are connected through a refrigerant pipe, a second refrigeration cycle circuit having a second compressor, a second radiator, a second pressure-reducing device and the supercooler that are connected through a refrigerant pipe, a refrigeration unit in which the first compressor and the first radiator are mounted, a showcase in which the first pressure-reducing device and the evaporator are mounted, a supercooling hot water supply device in which the second compressor, the second radiator, the second pressure-reducing device and the supercooler are mounted, and a hot-water stock device having a hot water supply tank that is connected to the second radiator of the supercooling hot water supply device through a second radiator.

Abstract: A system for distributing a cooling fluid in a room containing at least one heat generating component includes a primary heat exchanger having an inlet for receiving the cooling fluid, a heat exchange section configured to facilitate exchange of heat between airflow in the room and the cooling fluid, and an outlet for exhausting heated cooling fluid from the heat exchange section. The system also includes a secondary heat exchanger having a receiving section connected to the second section of a cooling fluid line for receiving heated cooling fluid, a heat exchange section configured to facilitate exchange of heat between the at least one heat generating component and the heated cooling fluid, and an exhaust section configured to exhaust secondarily heated cooling fluid.

Abstract: A method of controlling operation of a pair of two-stage air conditioners. The method monitors a temperature of an area served by the air conditioners; activates a first stage of a first or lead air conditioner when the temperature rises above a first set point temperature; activates a first stage of a second or lag air conditioner when the temperature rises above a second set point temperature; activates a second stage of the first air conditioner only if the temperature remains above the second set point temperature beyond a first selected time period; and activates a second stage of the second air conditioner only if the temperature remains above the second set point temperature beyond a second selected time period.

Abstract: A refrigeration device 30 includes two independent refrigeration circuits: the first refrigeration circuit 31A having an inverter compressor 32A and the second refrigeration circuit 31B having a constant-speed compressor 32B. An evaporator 37 is shared by both refrigeration circuits 31A, 31B. The inverter compressor 32A is normally driven and the constant-speed compressor 32B is additionally driven as necessary. The evaporator 37 includes a group of fins 41 having a plurality of fins 40 positioned along an airflow direction and arranged with a gap therebetween in a direction across the airflow direction. Evaporation tubes are routed in four tiers while penetrating through the fins 40 in the group of fins 41 and running in a zigzag in the airflow direction. The first evaporation tube 45A of the first refrigeration circuit 31A is arranged in the lower two tiers and the second evaporation tube 45B of the second refrigeration circuit 31B is arranged in the upper two tiers.

Abstract: An exemplary system includes a first heat exchanger immediately after the compressor that provides direct, conduction-based cooling with condensate recovered from the evaporator. A second heat exchanger cools the forced air that passes over the condenser by evaporating recovered condensate, rainwater, and/or city water into the air as it passes through a breathable water-retaining medium. Finally, a third heat exchanger is described that utilizes recovered condensate, rainwater, and/or city water within an insulated enclosure to obtain additional cooling before the condensed refrigerant enters the expansion valve. Various alternative embodiments are described that include variations of each of these heat exchangers. Additionally, several alternative placements of the heat exchangers are disclosed.

Abstract: An air conditioning system includes a first circulation module and a second circulation module. Two circulation modules are joined by a heat exchanger. The first circulation is a modular refrigeration system includes a compressor, expansion device, and heat exchangers. The second circulation module includes a main liquid refrigerant tank, a number of distributed liquid refrigerant tanks, liquid pumps and a plurality of indoor units which includes a heat exchange device and a vapor propelling device. The heat exchange device is connected to the main liquid tank. The vapor propelling device propels the working fluid in a saturated vapor state to the first heat exchanger, thus forming a working fluid loop. It can be switched between the heating and cooling modes.

Abstract: A vapor compression cycle system is combined with a Rankine cycle system, with the two systems having a common suction accumulator from which the compressor draws refrigerant vapor for the vapor compression cycle system and from which a pump draws liquid refrigerant for circulation within the Rankine cycle system. The vapor from the Rankine cycle system expander is passed to the compressor discharge to provide a mixture which is circulated within the vapor compression cycle system to obtain improved performance. The heat exchangers are sized so as to obtain a non-complete evaporation, with the resulting two-phase fluid passing to the suction accumulator to provide liquid refrigerant to the Rankine cycle system and vapor refrigerant to the vapor compression cycle system.

Abstract: An improved refrigerant system incorporates at least two circuits arranged in a cascaded relationship. Preferably, the upper circuit utilizes a hydrocarbon refrigerant and preferably the lower circuit utilizes CO2 refrigerant. Preferably, the CO2 circuit mainly operates in a subcritical region. To improve the efficiency and capacity control of the cascaded refrigerant system, at least one of the circuits is equipped with performance enhancement features such as, for example, an economized function provided by a flash tank or economizer heat exchanger. Additional enhancement features can also include a liquid-suction heat exchanger and bypass function.

Abstract: A refrigerator is provided. The refrigerator may include first and second refrigerant paths that separately distribute refrigerant, a first cooling chamber connected with a first cold air duct, a second cooling chamber connected with a second cold air duct, and a third cooling chamber connected with a third cold air duct. Cold air generated by a first evaporator is provided to the first cold air duct to cool the first cooling chamber, cold air generated by a second evaporator, which receives refrigerant from the first evaporator, is provided to the second cold air duct to provide concentrated cooling to the second cooling chamber, and cold air generated by a third evaporator is provided to the third cold air duct to cool the third cooling chamber.

Abstract: A cascade refrigeration system is provided. The cascade refrigeration system includes a low stage having a first refrigerant flowing therethrough and a high stage having a second refrigerant flowing therethrough. The low stage includes a compressor and evaporator coils. The input of the evaporator coils is operatively connected to the output of the compressor by an input conduit and the output of the operator unit is operatively connected to the input of the compressor by an output conduit. A bypass line has an input in communication with the input conduit and an output in combination with the output conduit. A bypass heat exchanger effectuates the heat exchange relationship between the first refrigerant flowing through the bypass line and the first refrigerant flowing through the input conduit.