Abstract: A refrigerant system has a compressor for compressing and delivering refrigerant to a heat rejecting heat exchanger. Refrigerant from the heat rejecting heat exchanger passes through an expansion device, and then to an evaporator. A reheat circuit includes a reheat valve for selectively tapping refrigerant from a location downstream of the compressor and upstream of the condenser. The reheat refrigerant passes through a reheat heat exchanger, the reheat heat exchanger being positioned to be in a path of air having passed over the evaporator, and delivered into an indoor environment to be conditioned.

Abstract: An HVAC system for a motorized vehicle or vessel is provided that includes a variable-speed compressor, a variable-speed condenser fan and a variable-speed evaporator fan. The HVAC system further includes a DC-power system for supplying DC power to the variable-speed compressor, the variable-speed condenser fan and the variable-speed evaporator fan regardless if the mobile unit's engine is operating or not operating. A controller and an operator interface are also provided for controlling the operation of the HVAC system.

Abstract: An incubator includes: an enclosure including a culture chamber; a heater configured to heat the culture chamber; a refrigerator including an evaporator and a condenser, and configured to cool the culture chamber; a temperature sensor configured to measure the culture chamber temperature; a refrigerator control unit configured to cause the refrigerator to operate, when a measured temperature measured by the temperature sensor reaches a refrigerator-operation temperature, higher than the set temperature by a first temperature, and cause the refrigerator to stop operating, when the measured temperature reaches a refrigerator-operation stopping temperature, lower than the set temperature by a second temperature; a heater control unit configured to control the heater in such a manner that the measured temperature reaches the refrigerator-operation temperature, when operation of the refrigerator is stopped; and a drain mechanism configured to discharge dew condensation water generated through heat absorption by th

Abstract: An air conditioning system for an aircraft for the individual air conditioning of regions of a cabin of an aircraft includes a central air conditioning device, which provides a pressurized and temperature-controlled central air flow. A part of the central air flow is supplied to a first cabin region. Another part of the central air flow is heated in a heating device or cooled in a cooling device and supplied to another cabin region. Water evaporates in the cooling device, in order to cool the air flow to be supplied to the cabin region.

Abstract: A thermal-protection apparatus disposed in a vehicle cabin or storage compartment includes a housing enveloping a chamber in which a thermally-sensitive consumer electronic device is received, a thermoelectric module mounted in a wall of the housing, and a remote electronic controller and power source coupled to the housing via an electrical cable for activating the thermoelectric module, and optionally the consumer electronic device, in a manner to prevent the temperature in the chamber from exceeding a prescribed maximum operating temperature of the consumer electronic device or falling below a prescribed minimum operating temperature of the consumer electronic device.

Abstract: A cooling device is provided with an inverter compressor. Set speeds of the inverter compressor can be switched to six stages from a first speed to a sixth speed. The relationship between each of the set speeds of the rotational speed is set so that the stages adjacent to each other have gradually larger differences in rotational speed as the rotational speed becomes higher. With this, independently from the level of the rotational speed, a degree of increase in cooling performance between each of the stages can be equalized. In a case of performing a control to increase or decrease the rotational speed of the inverter compressor stage by stage depending whether an actual temperature drop rate is larger or smaller than a target temperature drop rate, the change amounts in cooling performance that can be substantially equalized, and too high or too low cooling performance does not result, i.e. fluctuation in cooling performance can be minimized.

Abstract: A machine for making yoghurt without requiring active bacterial cultures includes a milk dispenser, an ingredient dispenser, a heating unit and a cooling unit. In particular, a vending machine further includes a credit entry component. The ingredient dispenser system releases at least one salt of a non-toxic divalent cation and at least one non-toxic acidulating agent.

Abstract: A method for configuring a controller for an HVAC system. The method comprises providing a closed loop refrigerant system and a control system to control the closed loop refrigerant system. The control system comprises a controller, an input device, and a processor including a signal sensing circuit. The input device is activated to provide one or more signals to the controller to control the components of the closed loop refrigerant system. One or more signals are sensed with the signal sensing circuit to determine whether signals are present between the input device and the controller. The signals are processed with the processor to determine what type of closed loop refrigerant system is present. The controller is then configured to control the type of system determined by the processor.

Abstract: A water supply system includes a main water tank and a sub-tank of smaller dimensions than the main tank for supplying hot and cold water for household use. The sub-tank is surrounded by a tubular coil of refrigerant in contact with the sub-tank, a layer of insulation and an outer wall for maintaining the insulation in place and protecting the tubular coil and sub-tank from being damaged. A water heater is disposed in or below a lower part of the tank and a three-way switch is provided for selecting heating or refrigeration during different seasons of the year.

Abstract: A first motor-actuated expansion valve and a second motor-actuated expansion valve which are connected in parallel with each other in back-to-back connection are provided between an outdoor heat exchanger and an indoor heat exchanger. In the first motor-actuated expansion valve, at the time of non-operation and full closure, when the refrigerant pressure on the indoor heat exchanger side is higher than the refrigerant pressure on the outdoor heat exchanger side by a predetermined value or more, the full closure is released by receiving the refrigerant pressure on the indoor heat exchanger side. In the second motor-actuated expansion valve, at the time of non-operation and full closure, when the refrigerant pressure on the outdoor heat exchanger side is higher than the refrigerant pressure on the indoor heat exchanger side by a predetermined value or more, the full closure is released by receiving the refrigerant pressure on the outdoor heat exchanger side.

Abstract: An air conditioning system equipped with at least one first air conditioning system in which an outdoor unit is connected to plural indoor units through an inter-unit pipe and the plural indoor units are allowed to execute one of cooling operation and heating operation concurrently, at least one second air conditioning system in which an outdoor unit is connected to plural indoor units through an inter-unit pipe and the plural indoor units are allowed to execute both cooling operation and heating operation in mixture concurrently, and a controller that is connected to the first and second air conditioning systems through a communication line so that communications can be performed between the controller and each of the first and second air conditioning systems, wherein the controller transmits a switching instruction signal for instructing switching of an air conditioning operation to cooling operation or heating operation through the communication line to the first and second air conditioning systems all tog

Abstract: The present invention discloses an apparatus for supercooling which can stably maintain a liquid in a supercooled state at below a phase transition temperature. The apparatus for supercooling, which can maintain a supercooled state of a liquid or contents even below a phase transition temperature, comprises: a storage space for storing a container accommodating a liquid or contents containing the liquid; a cooling means for cooling the liquid or contents or the storage space below the phase transition temperature of the liquid or the contents; and a temperature maintaining unit for applying energy to the surface of the liquid or contents or to a gas near the surface, wherein the liquid or the contents are maintained in a supercooled state by preventing freezing nuclei from being formed on the surface of the liquid or contents or in the gas near the surface by application of energy.

Abstract: An air conditioning system of a vehicle including a controller and sensors in communication with the controller. The sensors include an interior temperature sensor for determining the temperature of the vehicle interior and an inner surface temperature sensor for determining the temperature of the inner surface of the vehicle's windshield. The controller determines a dew-point for the vehicle interior based on the sensed interior temperature. The controller adjusts the dew-point or the inner surface temperature based on a correction value, and performs a defogging operation when the temperature of the inner surface of the windshield is less than the dew-point, wherein the dew-point or the inner surface temperature is adjusted.

Abstract: A fuel tank safety system includes an ullage cooling assembly and a system controller. The ullage cooling assembly includes a compressor configured to extract a quantity of ullage gas from the fuel tank, a heat exchanger coupled in flow communication downstream of the compressor, wherein the heat exchanger is configured to receive the quantity of ullage gas from the compressor and reduce a temperature of the ullage gas. The ullage cooling assembly includes a turbine coupled in flow communication downstream of the heat exchanger, wherein the turbine is configured to further reduce the temperature of the ullage gas and facilitate channeling the ullage gas to the fuel tank. The system controller is operatively coupled to the ullage cooling assembly and is configured to transmit to the ullage cooling assembly one of a start signal to activate the ullage cooling assembly or a stop signal to deactivate the ullage cooling assembly.

Abstract: The invention relates to a control unit for a refrigeration or air conditioning device, comprising a main processor that is situated in a housing and that controls the temperature, fan and/or the defrosting process of a refrigeration or air conditioning device. Contact points for a co-processor, which is separate from the main processor and is suitable for controlling an electronic expansion valve, are located in said housing.

Abstract: An air system for pressurizing and air conditioning a cockpit and cabin space of a plane comprises a compressor (3) for compressing an air mass flow, wherein the air mass flow to be compressed is extracted through a ram air duct (13, 14) from the environment of the plane and supplied through a heat exchanger (15, 18) to at least one zone (10A-D) to be pressurized and air conditioned.

Abstract: A heating and air-conditioning system for a motor vehicle, having at least one running-state system having a heat exchanger and a blower to supply an air flow across the heat exchanger; and a stop-state system having a heat carrier loop connected to the running-state heat exchanger, wherein coolant within the heat carrier loop can stream through the running-state heating heat exchanger. The system can include a housing having a stop-state coolant heater or cooler, a pump to move a coolant through the heat carrier loop, a controller to control the pump and the running-state blower (including the use of a temperature sensor), a power supply, which is available in a stopped state, and a blower to supply an air flow across the running-state heat exchanger. The housing can have a connection interface corresponding to running-state air ducts, whereby retroactive installation of the system is facilitated.

Abstract: There is provided a temperature switching compartment 3 which can switch the internal temperature thereof between a low temperature side at which a storage material is kept in cold storage and a high temperature side maintained at 50° C., to 80° C. at which cooked food is kept warm, by cooling with a cooler 17 and heating with a heater 15.

Abstract: Provided is an air conditioning system which can automatically switch the operating mode of at least one indoor unit based on the difference between a measured indoor temperature provided by an indoor temperature sensor and a predefined set indoor temperature and then set a new set indoor temperature. The air conditioning system does not require a user to manually switch the operating mode of the indoor unit, thereby maximizing user convenience. In addition, the air conditioning system can maintain optimum room temperature.

Abstract: A high efficiency cooling and heating apparatus comprises an outdoor condensing unit having a high speed fan disposed within a housing. Also disposed with the housing is a micro compressor run by a high speed brushless DC motor with a custom winding to increase efficiency and decrease weight. A control circuit allows the motor to operate at high speeds almost instantaneously. The fan pulls air across a dual condenser coil disposed within the housing. An indoor evaporative unit also houses a high speed fan along with a control circuit to allow an operator to select cooling or heating an air flow. The indoor and out door units are connected with hoses to provide heat exchange. The apparatus can be operated at a much higher ambient temperature than conventional air cooling and heating systems.

Abstract: An air conditioning control device is configured to obtain and control data on an air conditioner, which includes a plurality of indoor units. The air conditioning control device includes a data retrieval component, a data collection component, an analysis component, and an analyzed results display component. The data retrieval component retrieves air conditioner operating data including power consumption data for each indoor unit. The data collection component collects operating data at certain periods of time. The analysis component analyzes operating data for each indoor unit. The analyzed results display component visualizes and displays the analyzed data that has been analyzed by the analysis component.

Abstract: A refrigerator and a control method for the same are disclosed. The refrigerator includes a convertible storage room capable of performing a refrigerating function and a freezing function selectively or simultaneously, so as to allow a user to conveniently store a variety of food. More particularly, the refrigerator includes a body including a refrigerating storage room and a freezing storage room, a convertible storage room located between the refrigerating storage room and the freezing storage room, to selectively perform one of a freezing function and a refrigerating function, a first evaporator that cools the refrigerating storage room and a second evaporator that cools the freezing storage room and the convertible storage room selectively or simultaneously, and a cold air supply device that selectively supplies the cold air generated from the second evaporator into the freezing storage room and the convertible storage room.

Abstract: A pipe-connection searching apparatus and method for a multiple air conditioner. The apparatus and method involving the identification of one of a plurality of indoor units, based on temperature criteria, and matching the one indoor unit to a corresponding one of a plurality of pipes that connect an outdoor unit to the plurality of indoor units, respectively.

Abstract: When during a first action of a refrigeration system the internal cold storage temperature is held at a desired temperature by an evaporator, the refrigeration system performs a second action of increasing the cooling capacity of the evaporator to decrease the internal cold storage temperature. When during the second action the internal cold storage temperature reaches a minimum temperature Tmin, the refrigeration system stops a compressor and performs a third action. When during the third action the internal cold storage temperature reaches a maximum temperature Tmin, the refrigeration system drives the compressor and performs the first action.

Abstract: A refrigerant circuit (10) operates in a refrigeration cycle in which the pressure of refrigerant discharged from a compressor (22) is at or above the critical pressure. In performing an operation in which a first indoor heat exchanger (33a) performs a heating operation and, concurrently, a second indoor heat exchanger is made inactive, an indoor expansion valve (34b) associated with the inactive indoor heat exchanger (33b) is fully closed.

Abstract: An air conditioning system includes a controller for controlling the feed rate of air from a blower such that the inside of the operator's cab is at higher pressure than outside pressure when a pressurization mode for pressurizing the inside of the operator's cab is selected, a branch duct opening/closing damper device is provided for distributing the air from the blower to an air outlet directed to an operator and an air outlet undirected to the operator (i.e., a defroster air outlet). Further, the controller controls the branch duct opening/closing damper device such that the air is ejected from the air outlet directed to the operator in such a volume that makes the operator have comfortable cool or warm feeling whereas the remaining volume of air is ejected from the defroster air outlet, when the difference between the inside air temperature of the operator's cab and a preset temperature becomes small.

Abstract: The invention relates to a control unit for a refrigeration or air conditioning device, comprising a main processor that is situated in a housing and that controls the temperature, fan and/or the defrosting process of a refrigeration or air conditioning device. Contact points for a co-processor, which is separate from the main processor and is suitable for controlling an electronic expansion valve, are located in said housing.

Abstract: A first motor-actuated expansion valve and a second motor-actuated expansion valve which are connected in parallel with each other in back-to-back connection are provided between an outdoor heat exchanger and an indoor heat exchanger. In the first motor-actuated expansion valve, at the time of non-operation and full closure, when the refrigerant pressure on the indoor heat exchanger side is higher than the refrigerant pressure on the outdoor heat exchanger side by a predetermined value or more, the full closure is released by receiving the refrigerant pressure on the indoor heat exchanger side. In the second motor-actuated expansion valve, at the time of non-operation and full closure, when the refrigerant pressure on the outdoor heat exchanger side is higher than the refrigerant pressure on the indoor heat exchanger side by a predetermined value or more, the full closure is released by receiving the refrigerant pressure on the outdoor heat exchanger side.

Abstract: A humidity control method is provided for a multi-stage cooling system having two or more refrigerant circuits that balances humidity control and cooling demand. Each refrigerant circuit includes a compressor, a condenser and an evaporator. A hot gas reheat circuit having a hot gas reheat coil is connected to one of the refrigerant circuits and is placed in fluid communication with the output airflow from the evaporator of that refrigerant circuit to provide additional dehumidification to the air when humidity control is requested. The hot gas reheat circuit bypasses the condenser of the refrigerant circuit during humidity control. Humidity control is only performed during cooling operations and ventilation operations.

Abstract: An underwater thawing and freezing device includes: a thawing and freezing tank for containing therein ethyl alcohol water as a thawing and freezing liquid; a plurality of wave motion piezoelectric vibration elements for generating wave motions in the thawing and freezing tank; a temperature control unit for controlling a temperature of the ethyl alcohol water at a predetermined temperature, the temperature control unit having a temperature sensor for detecting the temperature of the ethyl alcohol water; and a control unit for controlling the wave motion piezoelectric vibration elements. The plurality of wave motion piezoelectric vibration elements generate wave motions at a plurality of different frequencies. The wave motions travel at an angle of an about 10 degrees inclined from a vertical line from a surface of the thawing and freezing tank, on which the respective wave motion piezoelectric vibration elements are provided.

Abstract: A method of controlling the temperature inside a cavity of a cooling appliance provided with a temperature sensor inside the cavity and with an actuator for adjusting the cooling capacity of the appliance, the food temperature is estimated on the basis of a value from the temperature sensor and on a predetermined function of a status of the actuator.

Abstract: Disclosed is a container warmer that utilizes the same compartment for heating and cooling. In optional embodiments, the unit may include a programmable timer operably connected to the heating and cooling units such that the timer may regulate activity of the units. In other embodiments, the invention may include a baby bottle warmer in which the baby bottle is placed in a water bath in a compartment, the water bath being heated or cooled by heating or cooling units, and optionally operably connected to a programmable timer.

Abstract: The invention relates to a refrigerator unit and/or a freezer unit having a space for the reception of the refrigerated goods or frozen goods, having a fan which removes air from the space, blows air into the space or circulates the air in the space and having a control unit connected to the fan which controls the fan for the purpose of influencing the temperature distribution such that it is operated in one rotary direction in a first operating state and in the other rotary direction in a second operating state. The invention further relates to a method of operating a refrigerator unit and/or a freezer unit.

Abstract: An air blowing arrangement for a combined refrigerator of the forced ventilation type and that comprises: a cabinet formed by an outer case and by two inner cases spaced from each other by a thermal insulating filler and defining a freezing compartment and a refrigerating compartment; and an air diffusing element defining at least one air distributing duct, having an air inlet in communication with the interior of the inner case of the freezing compartment and a plurality of air outlets opened to the interior of the refrigerating compartment. The air diffusing element is disposed in the interior of the thermal insulating filler and seated against the rear wall of the inner case of the refrigerating compartment, said rear wall being provided with a plurality of windows aligned with respective air inlet openings of the air distributing duct.

Abstract: In one embodiment, a combined cooling and heating system comprises a hydrogen reservoir. The combined cooling and heating system may be used in an aircraft. During a charging of the hydrogen reservoir, with hydrogen, a kitchen appliance is heated, and during the discharging process, the hydrogen reservoir cools the fuel cell system.

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 soft freeze assembly for a refrigerator including a freezer storage compartment having a first temperature includes a second storage compartment positioned within the freezer storage compartment. A heat source is positioned with respect to the second storage compartment and configured to heat air within the second storage compartment to a second temperature greater than the first temperature within the freezer storage compartment. A controller is in operational control communication with the heat source and configured to operate the heat source.

Abstract: A temperature control system for a vehicle that defines a load space for supporting cargo. The temperature control system includes a refrigeration unit that has a refrigeration circuit, and a heating system that has a heating circuit. The refrigeration circuit includes a prime mover and a cooling coil that selectively cools an airflow entering the load space. The heating circuit includes a pump that circulates a coolant fluid through the heating circuit, a dedicated heater that heats the coolant fluid, and a heating coil that selectively heats the airflow entering the load space. The temperature control system also includes a controller that detects conditions of the load space, and that engages one of the refrigeration unit and the heating system to condition the load space in response to the detected conditions.

Abstract: A mobile cart for serving food and/or beverages is described. According to various implementations, the cart is equipped with a removable mission module. The mission module includes equipment that is used by the cart to perform its designated mission, such as an oven (for a hot food service mission module), a cooling unit (for a cold food service mission module), a beverage dispenser (for a beverage service mission module), a point of sale terminal (for duty-free service mission module), appropriate branding (for a franchising mission), or a custom equipment (for a customized mission). The mission module also includes a processor and a memory. The mission module is removable, and may be one of several mission modules available to the cart. Thus, for each type of mission, there may be a different mission module. This enables the cart to be quickly and easily “customized” for each mission by replacing an unneeded module with a required one.

Abstract: An apparatus to control an air conditioner system and a method for controlling the same, in which an operational priority is given to an air conditioner or a ventilation system according to peripheral environment and a season such that the air conditioner and the ventilation system are selectively operated to provide optimum air conditioning environment. The method of controlling the air conditioner system including the air conditioner to cool and heat a room and the ventilation device to perform a ventilation operation includes detecting an outdoor temperature, determining a season by comparing the outdoor temperature with a preset reference temperature, and determining an operational priority relative to the air conditioner and the ventilation device based on the determined season.

Abstract: A method for automatically balancing air conditioning outdoor heat exchange detects a piping measured value of each piping equipment through a detection unit and compares the piping measured value with a set operation mode selected by users and a set value. Airflow amount of adjustable air vents is adjustable according to the comparing result. The method includes the steps of: (1) selecting an operation mode, (2) selecting an effective piping measured value which serves as the basis to operate an air fan device, and (3) based on the piping measured value corresponding to each exchange equipment to open the air vents at a desired degree. By means of the aforesaid method and system, the air conditioning outdoor heat exchange system can be balanced automatically.

Abstract: An object of the present invention is to provide an air conditioner and a controlling method thereof capable of effectively conditioning air in an operator cab of a vehicle even if a windshield or door of the operator cab is opened. The air conditioner comprises: a heating unit for heating an upper half of an operator's body; an open/close sensor for detecting opening and closing of the operator cab; and a controller for setting a heating power of the heating unit when the open/close sensor detects that the operator cab is opened, to be higher than the heating power of the heating unit when the operator cab is closed.

Abstract: A refrigerator including a temperature controlled compartment partitioned from the freezer compartment and the refrigerator compartment, a door for the temperature controlled compartment, a cooling unit installed in the temperature controlled compartment for supplying cold air to the temperature controlled compartment, a duct for defining a flow passage of the cold air to circulate the cold air supplied from the cooling unit within the temperature controlled compartment, a blower fan for blowing the cold air supplied from the cooling unit through the duct, and a control unit for generating control signals to drive the cooling unit and the blower fan so as to maintain a temperature in the temperature controlled compartment at a set temperature.

Abstract: Multi-type air conditioner comprising an outdoor unit installed in an outdoor, comprising a compressor, a refrigerant flow controlling part connected to a discharge end of the compressor for guiding the refrigerant proper to operation conditions selectively, an outdoor heat exchanger connected to the refrigerant flow controlling part, a defrosting device at a side of the outdoor heat exchanger, and a piping system connected between the parts, a plurality of indoor units each installed in a room and having an indoor heat exchanger and an electronic expansion valve having one end connected to one end of the indoor heat exchanger, and a distributor between the outdoor unit and the indoor units for selectively guiding refrigerant from the outdoor unit to the plurality of indoor units proper to operation conditions, and guiding the refrigerant passed through the indoor units to the outdoor unit again.

Abstract: In a multi-circuit heat pump system least one of the circuits has a reheat function. Various reheat concepts may be independently utilized for each circuit to reheat and dehumidify air. Moreover, the ability to bypass refrigerant around the outdoor heat exchanger may also be provided. Communication means between the circuits may be present to re-optimize the refrigerant charge and to provide better control over system operational parameters. The above mentioned control functions and design features assure system flexibility in satisfying a wide spectrum of market requirements and potential applications by operation in a variety of cooling, heating and dehumidification regimes and a combination of thereof.

Abstract: A high power thermoelectric controller system is disclosed, capable of operating multiple thermoelectric cooler (TEC) devices, each with a maximum power demand greater than 200 watts. The controller system utilizes interleaved triggering of multiple pulse width modulated power conversion circuits in order to minimize switching transient currents. In another aspect, the system incorporates a novel combination of a PWM controller circuit and H-bridge switching network into a single circuit that reduces the number of components needed to provide closed-loop proportional control of multiple TEC devices in a temperature control system.

Abstract: A refrigerant heat pump system is operable in both heating and cooling modes. A reheat circuit is integrated into the system schematic to provide improved control over temperature and humidity and to cover a wide spectrum of sensible and latent capacity demands.

Abstract: A refrigerant heat pump system is operable in both heating and cooling modes. A reheat circuit is integrated into the system schematic to provide improved control over temperature and humidity and to cover a wide spectrum of sensible and latent capacity demands. In the heating mode, the reheat coil is utilized to act as a portion of the enlarged indoor heat exchanger (a condenser in this case), in order to enhance system efficiency without the capacity loss. In some cases, where the designer can choose between the efficiency and capacity augmentation, selective operation of the reheat coil may offer an additional step of capacity modulation, in the heating mode. System reliability is improved through a reduction of start/stop cycles. Although various reheat coil arrangements in relation to the indoor and outdoor heat exchangers are offered and reheat concepts are considered, the benefits of the invention are independent from and transparent to such system design features.

Abstract: An air conditioner having a plurality of outdoor units and a plurality of indoor units with a common piping connected via a common piping to transfer refrigerant therebetween, the air conditioner including a first outdoor unit to provide heat, a second outdoor unit to defrost a heat exchanger of the second outdoor unit, and a first refrigerant guide unit in the second outdoor unit to guide a flowing direction of the refrigerant, wherein the refrigerant discharged from the first outdoor unit is circulated through the heat exchanger of the second outdoor unit.

Abstract: A method of controlling a heating cycle of a refrigeration system is provided that includes a refrigerant circuit. The refrigerant circuit includes a compressor having a suction port and an outlet having a discharge port with a hot gas compressor discharge line, a condenser for condensing the refrigerant, an evaporator for evaporating the refrigerant and an expansion valve. The method includes using refrigerant from the hot gas compressor discharge line to heat the evaporator during a heating cycle, detecting periodically a discharge superheat of the refrigerant leaving the outlet of the compressor, producing a control signal representing a difference between the detected discharge superheat and a minimum discharge superheat setpoint, adjusting the flow rate of the refrigerant to the suction port of the compressor according to the control signal so as to maintain the discharge superheat of the refrigerant at the outlet of the compressor substantially at the minimum discharge superheat setpoint.