Abstract: A system includes an active micro-electric mechanical system (MEMS) cooling system and a drive system. The MEMS cooling system includes cooling element(s) that direct fluid toward a surface of heat-generating structure(s) when driven to vibrate by a driving signal having a frequency and an input voltage. The drive system is coupled to the active MEMS cooling system and provides the driving signal. The drive system includes a power source and a feedback controller providing a feedback signal corresponding to a proximity to a resonant state of the at least one cooling element. The drive system adjusts at least one of the frequency and the input voltage based on the feedback signal such that the frequency corresponds to the resonant state of the cooling element(s). The input voltage does not exceed a maximum safe operating voltage for the cooling element(s).

Abstract: The present disclosure relates to the technical field of energy and power, in particular to an ejector with a core needle cooled by cooling medium. In the ejector with a core needle cooled by cooling medium, a cooling section is arranged between a stepping motor and a nozzle; the stepping motor, the cooling section and the nozzle are arranged coaxially, a partition plate and a sealing element are used to isolate the cooling medium from the primary flow medium, and the cooling medium is introduced into the cooling section to effectively cool the core needle therein, without affecting the adjustment function of the core needle for an area of the nozzle throat, so as to effectively improve the performance of the ejector. As the core needle is cooled, the adjustable ejector can be used in the primary flow fields with high temperature.

Abstract: An air conditioner includes an outdoor unit including a compressor, first and second indoor heat exchangers to receive a refrigerant from the outdoor unit, the second indoor heat exchanger receiving the refrigerant independently of the first indoor heat exchanger, and a fan disposed between the first and second indoor heat exchangers. First and second refrigerant pipes form flow paths between the outdoor unit and the first and second indoor heat exchangers. First and second expansion valves are disposed on the first and second refrigerant pipes. Third and fourth refrigerant pipes form flow paths between the compressor and the first and second indoor heat exchangers. A first opening and closing valve selectively opens and closes a fifth refrigerant pipe to selectively allow refrigerant to flow between the second and third refrigerant pipes. Second and third opening and closing valves selectively open and close the second and third refrigerant pipes.

Abstract: Some embodiments of the present disclosure provide an electronic expansion valve, including: a valve body, the valve body having a valve port; a valve head portion, movably provided in the valve body, the valve head portion including a valve head and a pressing sleeve, the valve head having an accommodating cavity, the end of the accommodating cavity close to the valve port having a bottom wall, a through hole being provided on the bottom wall, and the valve head being used for blocking the valve port; a guide sleeve, provided in the valve body, the valve head portion being inserted in the guide sleeve; a driving portion, movably provided in the valve body, an end of the driving portion penetrating the pressing sleeve, and a channel being provided on the end of the driving portion.

Abstract: An air conditioning system includes a main circuit having a multi-stage compressor, a condenser, a throttling element and an evaporator connected by pipelines; and a cooling branch, the inlet of which is connected to the main circuit between the condenser and the throttling element, and the outlet of which is connected to at least one of the first-stage suction port and the intermediate-stage suction port of the multi-stage compressor, wherein refrigerant from the cooling branch flows through the drive motor of the multi-stage compressor, and a regulating valve for controlling the opening of the cooling branch is provided on the cooling branch; and a control module that controls the opening of the regulating valve on the cooling branch based on the temperature of the outlet downstream of the drive motor on the cooling branch and the intermediate suction pressure of the intermediate-stage suction port of the multi-stage compressor.

Abstract: The present disclosure provides a composition comprising a refrigerant (mixed refrigerant), the composition having three types of performance; i.e., a coefficient of performance (COP) and a refrigerating capacity (Cap) that are equivalent to or higher than those of R404A and/or R410A, and a sufficiently low GWP. The present disclosure specifically provides a composition comprising a refrigerant, the refrigerant comprising difluoromethane (HFC-32), 2,3,3,3-tetrafluoropropene (HFO-1234yf), and at least one of 1,1-difluoroethylene (HFO-1132a) and tetrafluoroethylene (FO-1114).

Abstract: A facility-based dual-purpose conditioned air blower system includes a heat exchange unit, a diverter apparatus, and a centrifugal blower. The heat exchange unit includes an ambient air inlet, heat exchange elements, and a conditioned air outlet. The diverter apparatus includes a diverter inlet fluidly coupled to the conditioned air outlet of the heat exchange unit, a first diverter outlet to the facility, and a second diverter outlet. The diverter apparatus is moveable between a first position wherein the first diverter outlet is closed and the second diverter outlet is open, and a second position wherein the first diverter outlet is open and the second diverter outlet is closed. The centrifugal blower includes a blower inlet fluidly coupled to the second diverter outlet of the diverter apparatus, and a blower outlet positioned to ventilate a trailer interior with conditioned air from the conditioned air outlet of the heat exchange unit.

Abstract: A coolant cycle system for cooling a structure includes a two stage compressor configured to compress a coolant. The two stage compressor has a first stage with a first stage inlet and a first stage outlet and a second stage with a second stage inlet and a second stage outlet. The second stage is a high pressure stage relative to the first stage. A gas cooler has a coolant inlet fluidly connected to the second stage outlet and has a gas cooler outlet. The gas cooler outlet is fluidly connected to a heat exchanger and a fluid storage tank. The heat exchanger is configured to cool the fluid storage tank and has a heat exchanger coolant outlet fluidly connected to the second stage inlet. The fluid storage tank has a fluid storage tank outlet fluidly connected to a coolant inlet of an evaporator. A coolant outlet of the evaporator is fluidly connected to the first stage inlet of the compressor. The first stage outlet of the compressor is fluidly connected to the second stage inlet.

Abstract: A method and system for monitoring for leakage of flammable compounds is disclosed. A first parameter is measured indicative of the presence flammable compounds in a space around a potential leak source of a flammable compound, and a presence of the flammable compound is prospectively determined based on measurement of the first parameter. Additionally, a second parameter is measured in the space around the potential leak source. The prospective presence of the flammable compound determined by measurement of the first parameter is characterized, in conjunction with the measurement of the second parameter, as an actual presence of the flammable compound or as a false alarm.

Abstract: Providing simultaneous independent temperature control of conditioned air to first and second rooms. First and second evaporators may be positioned so that: air from the first room passes through the first evaporator before exhausting back to the first room; and air from the second room passes through the second evaporator before exhausting back to the second room.

Abstract: A humidifying device for transferring water and/or water vapour from waste air of a waste air flow to supply air of a supply air flow is provided. In the compensating chamber of the housing of the humidifying device, at least one spreading means is arranged, which spreads apart the plate stack of the humidifying device and the housing cover closing the housing in the direction of the longitudinal axis.

Abstract: A DC power supply device includes: a rectifier circuit; a reactor connected at one end to one output terminal of the rectifier circuit; a charging unit including a first and second switching element connected in series between another end of the reactor and another output terminal of the rectifier circuit, the charging unit configured to charge a first and second capacitor connected in series between output terminals to which a load is connected; and a control unit that controls the charging unit. The control unit sets, based on the timing at which the zero-crossing occurs, a dead time in which both the and second switching element are off, and when states of the first and second switching element at a time of occurrence of the zero-crossing match a predetermined set of states, reverses the states of the first switching element and the second switching element.

Abstract: An air-conditioning apparatus includes a main circuit in which a compressor, a flow switching device, an indoor heat exchanger, a pressure reducing device, and a plurality of parallel heat exchangers connected in parallel with each other are connected by pipes, a bypass pipe, a flow control device provided to the bypass pipe and configured to adjust a flow rate of refrigerant flowing through the bypass pipe, an evaporating pressure sensor configured to measure an evaporating pressure of the refrigerant, and a controller. The air-conditioning apparatus is configured to operate in a normal heating operation mode and a heating-defrosting operation mode. When an operation associated with the normal heating operation mode is switched to an operation associated with the heating-defrosting operation mode, the controller adjusts an opening degree of the flow control device using the evaporating pressure in the parallel heat exchanger and a driving frequency of the compressor.

Abstract: A modular data center and a method of building a modular data center. The modular data center includes a site microgrid including at least one power converter connected to a direct current (DC) bus and a digital power system. The digital power system includes at least one digital power transmitter, a set of transmission lines, and at least one digital power receiver. The modular data center design uses an adiabatic cooling system to cool the modular data center.

Abstract: Systems and methods for cooling a datacenter are disclosed. In at least one embodiment, an absorption chiller includes a generator vessel to enable removal of heat from fluid returned from at least one computing component of the datacenter.

Abstract: Provided are a refrigerator and a control method thereof. The refrigerator is characterized by enabling at least a part of a refrigerator door to be selectively transparent by a user's operation, such that the user sees through an inside of the refrigerator while the refrigerator door is closed.

Abstract: A refrigerator is provided. The refrigerator includes a main body including a first door, a door opening device configured to open the first door, a first proximity sensor disposed adjacent to the first door, a first infrared sensor disposed on the first door, and at least one processor, wherein the at least one processor is configured to, based on detection data obtained by the first proximity sensor, control the door opening device to open the first door based on an external object approaching within a threshold distance from the refrigerator, and based on the external object being identified based on detection data obtained by the first infrared sensor while the first door is open, control the door opening device to stop opening of the first door.

Abstract: Provided are a refrigerator and a control method thereof. The refrigerator is characterized by enabling at least a part of a refrigerator door to be selectively transparent by a user's operation, such that the user sees through an inside of the refrigerator while the refrigerator door is closed.

Abstract: A multiple-circuit heating and cooling system includes a first refrigeration circuit having a first condenser and a first evaporator and a second refrigeration circuit having a second condenser and a second evaporator. The first condenser and the second condenser are arranged in a first row split configuration, and the second condenser is downstream of the first condenser relative to a first air flow directed across the second condenser and the first condenser. Additionally, the first evaporator and the second evaporator are arranged in a second row split configuration, and the first evaporator is downstream of the second evaporator relative to a second air flow directed across the first evaporator and the second evaporator.

Abstract: A cryopump includes a cryopanel disposed in a cryopump housing and including a non-combustible adsorbent, a heater heating the non-combustible adsorbent and the cryopanel, a purge valve connecting the cryopump housing to a purge gas source, a rough valve connecting the cryopump housing to a rough pump, a sensor that generates a measurement signal indicating a temperature of the non-combustible adsorbent or an internal pressure of the cryopump housing, and a controller that controls at least one of the heater, the purge valve, and the rough valve based on the measurement signal so as to execute either a sublimation regeneration sequence for sublimating water from the non-combustible adsorbent by exposing the non-combustible adsorbent to a vacuum atmosphere or a dehydration sequence for dehydrating the non-combustible adsorbent by exposing the non-combustible adsorbent to a dry atmosphere at room temperature or a temperature higher than the room temperature.