Abstract: An electronics cabinet cooling system may include multiple cabinet heat exchangers mounted at an air discharge of respective different electronic cabinets. Heat from a flow of air heated by electronic components in the electronic cabinets may be received by respective cabinet heat exchangers. A liquid refrigerant flowing through the heat exchangers in parallel may be at least partially changed from liquid to gas and absorb the heat from the flow of air. A three-way tee in a common outlet header downstream from the cabinet heat exchangers may direct the gas refrigerant to a condenser and the liquid refrigerant to a receiver. The condenser may condense the gas refrigerant to liquid refrigerant, which may be routed to the receiver.

Abstract: At a refrigeration cycle device, an injection pipe and an economizer heat exchanger are provided at a main refrigerant circuit. In addition, the refrigeration cycle device includes a sub-refrigerant circuit having a sub-usage-side heat exchanger. At the refrigeration cycle device, the sub-usage-side heat exchanger functions as an evaporator of a sub-refrigerant and cools a main refrigerant that has been cooled at the economizer heat exchanger, or functions as a radiator of the sub-refrigerant and heats the main refrigerant that has been cooled at the economizer heat exchanger.

Abstract: A mixing device and a vapor compression system incorporating a mixing device are provided. The vapor compression system includes a suction line, at least two compressors, and at least one mixing device that is predominantly open (e.g., i.e., include at least a certain percentage, such as seventy percent (70%), of voids/openings). The suction line is used for transferring a working fluid made up of a mixture of a refrigerant and an oil. The suction line includes at least one inlet (e.g., for receiving the working fluid) and at least one outlet (e.g., for distributing the working fluid). The vapor compression system include a first compressor fluidly connected to a first outlet and a second compressor fluidly connected to a second outlet. At least one mixing device is disposed within the suction line (e.g., to increase an internal turbulence of the working fluid).

Abstract: The disclosure is directed to an energy efficient thermal protection assembly. The thermal protection assembly can comprise three or more thermoelectric unit layers capable of active use of the Peltier effect; and at least one capacitance spacer block suitable for storing heat and providing a delayed thermal reaction time of the assembly. The capacitance spacer block is thermally connected between the thermoelectric unit layers. The present disclosure further relates to a thermoelectric transport and storage devices for transporting or storing temperature sensitive goods, for example, vaccines, chemicals, biologicals, and other temperature sensitive goods. The transport or storage device can be configured and provide on-board energy storage for sustaining, for multiple days, at a constant-temperature, with an acceptable temperature variation band.

Abstract: The present disclosure relates to a control method and a control device of an air conditioning system, and an air conditioning system, and relates to the technical field of air conditioners: the method includes: determining whether piping length compensation is required; if the piping length compensation is required, acquiring one or more metric parameters; and determining a compensation value according to the one or more metric parameters, and adjusting an operating state of the air conditioning system according to the compensation value.

Abstract: A relay device and a multi-split control system that achieve reliable communication between an outdoor air conditioning unit and multiple indoor units under the condition that the length of a communication bus is limited. The system expands the communication distance by a cascade path formed by a plurality of relay devices. The cascade path transmits control signals sent by a master control device/a specific slave control device (i.e. a slave control device communicating with the master control device or certain relay device) to corresponding slave control devices one by one, and the corresponding slave control devices transmit the signals to the master control device/specific slave control device according to a response signal fed back by the control signal, where the relay devices may respectively communicate with a source node device and a destination node device on the basis of the master-slave type communication mode.

Abstract: In an example method, a power management system receives sensor data regarding an operation of a primary power source, a secondary power source, an environmental regulation system, and a plurality of electrically-powered sub-systems. Further, the system receives a plurality of parameter sets for the sub-systems, each including a first parameter indicting a priority of a respective sub-system relative to the other sub-systems, a second parameter indicating an amount of heat dissipated by the respective sub-system during operation, and a third parameter indicating a temperature requirement associated with the respective sub-system. The system controls, based on the sensor data and the parameter sets, a delivery of electrical power from the primary and secondary power sources to the environmental regulation system and the sub-systems. Further, the system controls, based on the sensor data and the parameter sets, a consumption of electrical power by the environmental regulation system and the sub-systems.

Abstract: A dual-phase refrigeration system for chilled storage containers (CSC) aboard boats maintains cold temperatures in the CSC by chilling the airspace in the upper portion of the CSC. A cooling liquid is circulated through coils installed on an interior sidewall about an upper margin of the CSC. The cooling liquid chills the air in the upper portion of the CSC which creates a thermodynamic airflow within the CSC which aids in cooling. The temperature of the cooling liquid is maintained by a heat exchange with a Non-Ozone Depleting Hydrofluorocarbon (NODHFC) refrigerant which, in turn, is cooled by a heat exchange with circulating water sourced from the body of water supporting the boat. If ice is added to the CSC, the cooling liquid in the coils reduces the air temperature differential across air/ice interface and maintains the quality of the ice.

Abstract: An air-conditioning system that performs a refrigeration cycle in a refrigerant circuit includes: an outdoor unit; a plurality of indoor units; a refrigerant connection pipe that connects the outdoor unit and the indoor units; and a first control valve disposed in the refrigerant connection pipe and that blocks a flow of refrigerant. The refrigerant connection pipe includes: a plurality of indoor-side pipes that each communicate with one of the indoor units; an outdoor-side pipe that communicates with two or more of the indoor-side pipes from an outdoor unit side; and a branch that connects the outdoor-side pipe and a group of two or more of the indoor-side pipes.

Abstract: A control device for a refrigerator system for cooling a load by using a plurality of refrigerators, said control device comprising a unit to control the number of operating units that changes the number of operating refrigerators according to the load rate, and a cold water temperature acquisition unit that acquires, via a temperature sensor, the temperature of cold water affected by the refrigerators. After a prescribed standby time from when the number of operating refrigerators was changed has elapsed, the unit to control the number of operating units changes the number of operating units and reduces the prescribed standby time when at least one of the cold-water temperature and the rate of change in the cold-water temperature satisfies a prescribed condition.

Abstract: A refrigerator and a method for controlling the same are disclosed. The refrigerator may minimize the size and material cost of the control system by controlling the internal temperature and the speed of a compressor using a thermostat used in the conventional low-capacity/low-cost refrigerator without using a system controller equipped with various sensors (internal sensors and/or external sensors) capable of controlling the internal temperature. In addition, since an inverter controller capable of controlling a BLDC compressor estimates the internal/external temperature based on operation information of the compressor, and determines the internal load, it may save energy and reduce vibrations and noise, which are the largest disadvantages of a constant-speed compressor, thereby improving satisfaction of the consumer. In addition, the BLDC compressor may be started and operated stably by applying a differentiated algorithm of the inverter controller.

Abstract: Embodiments of the current disclosure include air pretreatment devices suitable for pretreatment of air received by air handler units. The air pretreatment devices can include an air intake configured to capture the outside air. A cooling coil system can process changes in the dry bulb and dew point temperatures of the captured outside air. The pretreated air can then be passed via an air outtake to the air handler. The cooling coil system can be coupled to at least a chilled water intake and a chilled water return line. Finally, a single water valve control unit located on either the chilled water intake or chilled water return line can be adjusted to direct a change in the dry bulb temperature and dew point temperature within the cooling coil system.

Abstract: The present disclosure discloses an air conditioning system, an operating method and an operating device of the air conditioning system. The air conditioning system includes multiple outdoor units and multiple indoor units. The multiple indoor units include a first indoor unit configured to have wired communication and a second indoor unit configured to have wireless communication. The multiple outdoor units includes a first model outdoor unit connected with the first indoor unit configured to have wired communication, a second model outdoor unit corresponding to the second indoor unit, and a main outdoor unit configured to receive communication information from the first indoor unit and/or the second indoor unit, determine a target outdoor unit for communication on the basis of the communication information, and send the communication information to the target outdoor unit for communication.

Abstract: The cooling systems and methods of the present disclosure involve modular fluid coolers and chillers configured for optimal power and water use based on environmental conditions and client requirements. The fluid coolers include wet media, a first fluid circuit for distributing fluid across wet media, an air to fluid heat exchanger, and an air to refrigerant heat exchanger. The chillers, which are fluidly coupled to the fluid coolers via pipe cages, include a second fluid circuit in fluid communication with the air to fluid heat exchanger and a refrigerant circuit in thermal communication with the second fluid circuit and in fluid communication with the air to refrigerant heat exchanger. Pipe cages are coupled together to allow for expansion of the cooling system when additional cooling capacity is needed. The fluid coolers and chillers are configured to selectively operate in wet or dry free cooling mode, partial free cooling mode, or mechanical cooling mode.

Abstract: A thermal management system for an electric vehicle includes an interior air conditioning part including an air inflow part, an air discharge part, a cooling core, a heating core arranged between the cooling core and the air discharge part, and an adjustment door. The adjustment door is selectively adjustable to control whether air from the cooling core may flow into the heating core. A heat transfer line connects an electric part core to the heating core for transferring that heat of the electric part to the heating core, in order to allow heat dissipation of the electric part through the heating core.

Abstract: An air-conditioning apparatus includes a plurality of indoor units. Each of the indoor units includes a heat-medium flow adjusting valve and a heat exchanger. The heat-medium flow adjusting valve adjusts the flow rate of a heat medium that flows into the heat-medium flow adjusting valve, and causes the heat medium to flow out of the heat-medium flow adjusting valve. The heat exchanger causes heat exchange to be performed between the heat medium and air. The heat medium flows into the heat exchanger from an inflow side of the heat exchanger. The inflow side of the heat exchanger is connected to an outflow side of the heat-medium flow adjusting valve. The plurality of indoor units are connected in series.

Abstract: An air conditioning system includes a plurality of air conditioning indoor units installed in a target space, a plurality of remote control devices corresponding to the air conditioning indoor units, and a controller. The remote control device has a command input to set the corresponding air conditioning indoor unit or the remote control device. The controller performs a process based on the command input to the remote control device. Each remote control device includes a communicating unit that performs a communication with the corresponding air conditioning indoor unit, and a short range wireless communicating unit that performs a short range wireless communication with a communicating apparatus having a function of the short range wireless communication. The command is input by receiving a signal transmitted from the communicating apparatus by the short range wireless communication, at the short range wireless communicating unit.

Abstract: A refrigeration apparatus comprises a first refrigerant system and a second refrigerant system. The first refrigerant system comprises a first compressor, a cascade heat exchanger and a first evaporator. The second refrigerant system comprises a second compressor, a second condenser, the cascade heat exchanger and a second evaporator. The second compressor has an economizer port, and the cascade heat exchanger is connected to the economizer port of the second compressor.

Abstract: The disclosure an air conditioning system and a method of controlling the same. During the heating operation of the A2W indoor unit, the A2A valve that connects the outdoor unit to the A2A indoor unit is closed to prevent the inflow of the refrigerant into the A2A indoor unit, so it is possible to prevent performance degradation by improving performance loss due to refrigerant bypass to a stationary A2A indoor unit. In addition, in order to improve the performance due to deterioration of heating performance, the system itself can cope with a control algorithm without any additional hardware configuration, thereby minimizing the installation cost.

Abstract: A transport refrigeration system (TRS) includes a first heat transfer circuit including a first compressor, a condenser, a first expansion device, and a cascade heat exchanger. The first compressor, the condenser, the first expansion device, and the cascade heat exchanger are in fluid communication such that a first heat transfer fluid can flow therethrough. The TRS includes a second heat transfer circuit including a second compressor, the cascade heat exchanger, a second expansion device, and an evaporator. The second compressor, the cascade heat exchanger, the second expansion device, and the evaporator are in fluid communication such that a second heat transfer fluid can flow therethrough. The first heat transfer circuit and the second heat transfer circuit are arranged in thermal communication at the cascade heat exchanger such that the first heat transfer fluid and the second heat transfer fluid are in a heat exchange relationship at the cascade heat exchanger.

Abstract: Methods and systems for controlling distribution of a main power supply and backup power supply can include detecting an output load on the main power supply from one or more electronic devices in excess of a threshold, which may correspond to a high efficiency band of the main power supply, and causing a backup power supply to provide an amount of supplemental power to the one or more electronic devices based in part on a difference between the output load and the threshold.

Abstract: An air conditioning system includes: outdoor units; indoor units each communicating with any one of the outdoor units by a first communication method; and a central control device communicating with each of the outdoor units by a second communication method and controlling the outdoor units and the indoor units. One of the outdoor units generates, by using a first address used for communication performed using the first communication method, a second address used for communication performed using a second communication method, generates a second address for one or more of the indoor units by using a first address, and obtains second addresses from another outdoor unit and the central control device. The central control device obtains, from each of the outdoor units, second addresses of the outdoor unit and each indoor unit, and controls operations of the outdoor units and the indoor units by using the second addresses obtained.

Abstract: An air conditioner includes a main control unit, and a motor-driving control unit. The main control unit transmits, at every first time, an instruction for rotating the motor to the motor-driving control unit. The motor-driving control unit outputs, on the basis of the instruction, an instruction for rotating the motor to the inverter output unit. When the motor-driving control unit does not receive a new instruction for rotating the motor from the main control unit before the first time elapses from a time when the motor-driving control unit receives the instruction for rotating the motor from the main control unit last, the motor-driving control unit outputs an instruction for continuing operation based on the instruction for rotating the motor received from the main control unit at an immediately preceding time to the inverter output unit.

Abstract: A refrigeration system and refrigeration method for a data center are disclosed. The refrigeration system includes: a first heat exchanger disposed on a back plate of an indoor cabinet of the data center, and a phase-change heat-exchange cooling tower disposed outdoor of the data center. The first heat exchanger and the phase-change heat-exchange cooling tower are communicated by a secondary refrigerant delivery pipeline. The phase-change heat-exchange cooling tower transfers heat carried in the secondary refrigerant into air and condenses the secondary refrigerant to a liquid again; the secondary refrigerant employs a phase-change heat-exchange working medium. An air pump is disposed in the phase-change heat-exchange cooling tower and on a by-pass of the secondary refrigerant delivery pipeline to pressurize the secondary refrigerant in gas-state delivered in the secondary refrigerant delivery pipeline to increase the condensing pressure for condensing the secondary refrigerant to a liquid again.

Abstract: Disclosed herein is a system suitable for X-ray detection. The system comprises a detector and cooling system configured to control temperature of the detector and prevent condensation of water vapor on the detector. The detector comprises an X-ray absorption layer and electronics layer. The X-ray absorption layer comprises a plurality of pixels, each pixel configured to count numbers of X-ray photons incident thereon whose energy falls in a plurality of bins, within a period of time. The electronics layer comprises an electronic system configured to add the numbers of X-ray photons for the bins of the same energy range counted by all the pixels. The cooling system comprises a chiller configured to lower temperature and moisture level of air, and a fan configured to blow the air that is cooled and dried to the detector.

Abstract: An air conditioner includes a compressor having a compressor motor including coils, an indoor fan having a fan motor, a connection switching unit that switches a connection state of the coils between a first connection state and a second connection state in which a line voltage is lower than a line voltage in the first connection state, and a controller that controls the compressor motor, the fan motor, and the connection switching unit. The controller provides a stop period during which rotation of the compressor motor stops before the connection switching unit switches the connection state of the coils, and rotates the fan motor for at least a time period within the stop period.

Abstract: A heat pump apparatus includes: a refrigerant circuit which circulates refrigerant; a heat medium circuit which makes a heat medium flow; a heat exchanger which cause heat exchange to be performed between the refrigerant and the heat medium; and an indoor unit which houses at least the heat exchanger. The heat exchanger has a double-wall structure. The indoor unit includes a container which houses the heat exchanger. In the container, a first opening port is formed to communicate with an outdoor space without communicating with an indoor space.

Abstract: A heating mode control method of an air conditioner, comprises: obtaining an indoor temperature and calculating the difference between the indoor temperature and an indoor target temperature to obtain an indoor temperature difference as air conditioner running at heating mode; performing a coil temperature control process as the indoor temperature difference in a set indoor temperature difference range, wherein the coil temperature control process including: obtaining an indoor coil temperature and controlling the frequency of the compressor according to the indoor coil temperature and a coil target temperature. The application of the method can achieve the purpose of improving the heating effect by increasing the outlet air temperature, thus improving the heating performance of an air-conditioner.

Abstract: A series connection having multiple safety switches. Here, the series connection includes wiring connecting the safety switches. The safety switches can output signals. Depending on the registration of these signals by additional safety switches of the series connection it will be detected whether the wiring is laid out for connecting a master, and whether such a master is connected. Depending on this, the operation of the safety switches is predetermined.

Abstract: A transcritical R-744 refrigeration system comprising at least one first compressor for compressing an R-744 refrigerant, a gas cooler for cooling the R-744 refrigerant compressed by the at least one first compressor, a throttling device for decreasing the pressure of the cooled R-744 refrigerant, a receiver for separating the R-744 refrigerant, a first heat exchanger for exchanging heat between the cooled R-744 refrigerant and the R-744 vapors separated by the receiver before the R-744 vapors are transported to the at least one first compressor, and an integrated R-744 refrigerant-based air-conditioning assembly comprising a second plurality of compressors and an air conditioner comprising a second heat exchanger and an evaporator, wherein the system is operatable in a dehumidification mode wherein the R-744 vapors exiting the gas cooler are fed through the second heat exchanger to heat and dehumidify the passing ambient air before being fed to the receiver.

Abstract: In one embodiment, a data center cooling system includes one or more information technology (IT) rooms having multiple electronic racks that generate heat. An external cooling unit is positioned above the IT rooms and is configured to provide cooling fluid and to exchange heat carried by the cooling fluid. The external cooling unit has a supply line to distribute cooling fluid downwardly to the IT rooms. As the cooling fluid cools the electronic racks, the cooling fluid heats up and at least partially turns to vapor which rises due to convection. The external cooling unit also has a return line to return the rising vapor to the external cooling unit, which cools the vapor. The vapor changes phase to liquid and is recirculated to the IT rooms.

Abstract: A temperature control system includes: first and second refrigerator units; a first fluid flow apparatus that allows a first fluid to flow therethrough and that is cooled by the first refrigerator unit; a second fluid flow apparatus that allows a second fluid to flow therethrough and that is cooled by the second refrigerator unit; and a valve unit that is configured to allow the first fluid or the second fluid to selectively flow out therefrom. The first refrigerator unit has, in a medium-temperature-side refrigerator, a medium-temperature-side first expansion valve and a medium-temperature-side second expansion valve. A medium-temperature-side second evaporator corresponding to the medium-temperature-side second expansion valve and a low-temperature-side condenser of a low-temperature-side refrigerator constitute a cascade condenser.

Abstract: The present disclosure relates to an air conditioner, an air conditioner controlling system, and an air conditioner controlling method. The air conditioner controlling system includes one or more controlled air conditioners, a main controlling air conditioner having control authority over, from among the one or more controlled air conditioners, one or more controlled air conditioners that belong to an upper rank group corresponding to the main controlling air conditioner, and a sub-controlling air conditioner having control authority over, from among the one or more controlled air conditioners, one or more controlled air conditioners that belong to a first lower rank group.

Abstract: A data center system includes: a data center including an electronic device and an air conditioner configured to cool the electronic device; a cooling device including a first cooler configured to cool cooling water to be supplied to the data center by an air blow and a second cooler configured to cool the cooling water by heat exchange; and a control device configured to control the cooling device, wherein the control device is configured to: acquire outside temperature information from a temperature sensor provided outside the data center; calculate cooling water temperature information to be set to the cooling device by adding a cooling temperature difference based on a cooling ability of the first cooler to the outside temperature information; and set the cooling water temperature information to the cooling device.

Abstract: Provided is an air conditioning system that achieves energy conservation and comfortableness. In the air conditioning system (100), an outdoor-air conditioner (10) sucks outdoor-air (OA) and supplies the outdoor-air as supply air (SA) from an air handling unit (30). An indoor-air conditioner (50) cools or heats indoor-air (IA) that is an air inside a target space (SP) by using an indoor unit (70) and supplies the air to the target space (SP). A general control unit (90) controls performs cooperative load control in which an operating capacity of the outdoor-air conditioner (10) and an operating capacity of the indoor-air conditioner (50) are controlled in cooperation in accordance with a status of the outdoor-air (OA), a status of the indoor-air (IA), an operation status of the outdoor-air conditioner (10), and/or an operation status of the indoor-air conditioner (50).

Abstract: A method for controlling a vapour compression system (1) is disclosed, the vapour compression system (1) comprising at least one compressor (2, 16), a heat rejecting heat exchanger (3), a high pressure expansion device (4, 15, 17), a receiver (5), an evaporator expansion device (6), an evaporator (7) and a gas bypass valve (8), arranged in a refrigerant path. It is registered that the gas bypass valve (8) is malfunctioning or saturated, and a pressure value for a pressure prevailing inside the receiver (5) is obtained. Finally, the vapour compression system (1) is controlled in order to control a gaseous refrigerant supply to the receiver (5) to adjust the pressure prevailing inside the receiver (5) to reach a target pressure level.

Abstract: Various examples are disclosed for workload placement using forecast data. Forecast data for workloads and providers during a predefined period of time in the future is considered when identifying stressed providers and the feasibility of a workload move. Workloads with demand spikes at different future times can be matched by stacking current demand and forecast demand by timestamps. The possibility of stress can be reduced by making moves preemptively and considering forecast demand when evaluating the feasibility of a workload move.

Abstract: Systems and methods for distributing load of an energy plant are disclosed herein. A target load of at least a first device and a second device of the energy plant is obtained. A first power consumption of the first device and the second device predicted to result from operating the first device and the second device according to a first combination of set points to satisfy the target load is predicted. A second power consumption of the first device and the second device predicted to result from operating the first device and the second device according to a second combination of set points to satisfy the target load is predicted. The first power consumption and the second power consumption are compared, and a combination of set points rendering lower power consumption is selected to operate the energy plant.

Abstract: A compressor system includes a variable-speed compressor and a fixed-speed compressor. A control unit is operatively coupled to the variable-speed compressor and is operatively coupled to the fixed-speed compressor. A sensor is operatively coupled to the control unit and disposed in an enclosed space. The sensor measures at least one of a temperature and a relative humidity of the enclosed space and determines an HVAC load of the enclosed space. Responsive to a determination of the HVAC load, the control unit directs operation of the variable-speed compressor and the fixed-speed compressor.

Abstract: A cooling system and a multi-function heat exchanger design for electronics racks has one or more liquid-to-liquid heat exchangers (or their functions) and one or more liquid-to-air heat exchangers (or their functions). Each liquid-to-liquid heat exchanger has a rack-liquid channel, and an external-liquid channel, the rack-liquid channel and the external-liquid channel being fluidly isolated from each other, and thermally coupled to each other to transfer thermal energy between rack-liquid that circulates through the rack-liquid channel and external-liquid that circulates through the external-liquid channel. The one or more liquid-to-air heat exchangers each have an air path that circulates air between the electronics racks and ambient space around the electronics racks, the air path being thermally coupled to an external-liquid channel of the liquid-to-air heat exchanger to transfer thermal energy between the air and the external-liquid.

Abstract: Provided is an air conditioning apparatus, a central control apparatus of the air conditioning apparatus, a remote control apparatus of the air conditioning apparatus, an indoor apparatus of the air conditioning apparatus and a method of controlling thereof. The central control apparatus of the air conditioning apparatus includes: a plurality of branched ports connected to a pipe of a plurality of indoor apparatuses and provided with predetermined identification information; and a central controller configured to identify the plurality of indoor apparatuses connected through the branched port, based on the identification information, and configured to control an operation of components contained in the air conditioning apparatus based on a result of the identification.

Abstract: An equipment management system includes a control terminal and a management apparatus. The control terminal transmits equipment information related to equipment. The management apparatus includes a CPU and an interface. The management apparatus controls the control terminal through a network. The CPU executes calculation of information processing that is based on information received from the control terminal, determines a load level corresponding to a load of the information processing by the calculation unit, and executes reduction control to reduce the load on the calculation unit in accordance with the load level. The interface being transmits the load level to the control terminal. The control terminal changes, in accordance with the load level, a communication condition of equipment information to be transmitted to the management apparatus.

Abstract: An apparatus includes a high side heat exchanger, a flash tank, a subcooler, an expansion valve, a load, and a compressor. The high side heat exchanger removes heat from a refrigerant. The flash tank stores the refrigerant. The subcooler heat exchanger receives the refrigerant. During a first mode of operation, the load uses the refrigerant to cool a space proximate the load and the compressor compresses the refrigerant. During a second mode of operation, the subcooler heat exchanger directs the refrigerant to the expansion valve, transfers heat from the refrigerant from the flash tank to the refrigerant from the expansion valve and directs the refrigerant from the expansion valve to the compressor. During the second mode of operation, the compressor compresses the refrigerant from the subcooler heat exchanger and directs the compressed refrigerant from the subcooler heat exchanger to the load to defrost the first load.

Abstract: Method for controlling a compressor system, arranged in a heat pumping circuit, said compressor system being designed to be operated at at least two different compressor capacity stages, said compressor capacity stages being adjusted by a capacity adjustment system enabling switching from one compressor capacity stage to another compressor capacity stage, said capacity adjustment system being controlled by a capacity selection signal defining the compressor capacity stage to be selected, said method comprising determining a capacity set value, determining a decision quantity on the basis of said capacity set value, determining a calculated capacity average value on the basis of capacity selection signals generated before, comparing said calculated capacity average value with said decision quantity and changing said compressor capacity stage to the next higher stage if the calculated capacity average value is below the decision quantity or changing said compressor capacity stage to the next lower stage if the

Abstract: The present invention relates to a refrigerant circuit for a refrigerator and/or freezer, with at least one body and with at least one cooled interior space arranged in the body, wherein the refrigerant circuit includes at least one evaporator and at least one condenser as well as at least one compressor, wherein the condenser is partly or completely arranged in a liquid bath that at least partly absorbs the condensation heat in operation of the refrigerant circuit.

Abstract: The present disclosure relates to the field of air conditioning technology. In particular, it involves a control method and control system based on a variable speed AC compressor.

Abstract: A hydraulic pumping system for pumping a flow of aqueous liquid, for HVAC and potable water systems, through a plurality of hydraulic pump assemblies and mating branching feeder pipes extending between a main inlet pipe and a main outlet pipe for outputting the total flow of water, each of said pump assemblies in operative association with a mating feeder pipe to control aqueous liquid flow through said associated feeder pipe, wherein each of the hydraulic pump assemblies comprises an electric motor, mechanically coupled to a centrifugal pump and a variable frequency drive (VFD) electrically coupled to the motor. A controller is electrically coupled via a communication channel to the VFD of each of the hydraulic pump assemblies, the controller comprising a programmable device programmed to control the speed of each of the motors via the connected VFD.

Abstract: An air conditioner control device includes: a receiver that receives measurement values for ambient temperatures of air conditioners installed inside a facility; and a controller that adjusts setting temperatures for cooling operations (or heating operations) of each of the air conditioners to values that are less (or values that are greater) than the measurement values for each of the air conditioners, when at least one of the measurement values received by the receiver is greater (or less) than a target temperature inside the facility.

Abstract: A chiller plant includes a first pump module having at least one first pump module wall; a second pump module having at least one second pump module wall; and a plurality of chiller modules each having at least one chiller module wall. The first pump module, the second pump module, and the plurality of chiller modules may be placed together to form the chiller plant. The at least one first pump module wall, the at least one second pump module wall, and the chiller module walls may collectively form a perimeter wall around at least a portion of the chiller plant. Other embodiments of the chiller plant, and methods for its use, are described herein.

Abstract: A method and apparatus for determining a water chilling unit for cooling a data center are provided. The method includes: acquiring a current water output parameter, a current water input parameter, a current water flow parameter and a current outdoor temperature parameter of each water chilling unit of the data center; pre-processing the water output parameter, the water input parameter, the water flow parameter and the outdoor temperature parameter to obtain a characteristic parameter of each water chilling unit; importing the characteristic parameters of each water chilling unit into a pre-established machine learning model to obtain the current electric power of each water chilling unit; and determining a water chilling unit for cooling the data center on the basis of a preset cooling load, a rated cooling capacity of the water chilling unit and the current electric power of each water chilling unit.