Embodiments of a pressure switch assembly having a quick connect capillary tube are disclosed. One embodiment, among others, has an elongated cylindrical capillary tube for attachment to a refrigeration line so that refrigeration fluid pressure in the refrigeration line can be sensed. A quick connect coupling is connected to the shutoff valve. A shutoff valve is designed to open and close fluid communication between the capillary tube and the quick connect coupling when the quick connect coupling is coupled and decoupled, respectively. A switch body is connected to the quick connect coupling and has first and second electrical connections. The switch body has an internal on/off switch designed to electrically connect and electrically disconnect the first and second electrical connections based upon a predetermined set point of pressure associated with refrigeration fluid that is in communication with the switch body.

A subcooling controller includes a sensor and a processor. The sensor measures one or more of a temperature external to a first heat exchanger that removes heat from carbon dioxide refrigerant, a temperature of the carbon dioxide refrigerant, and a pressure of the carbon dioxide refrigerant. The processor determines that one or more of the measured temperature external to the first heat exchanger, the temperature of the carbon dioxide refrigerant, and the pressure of the carbon dioxide refrigerant is above a threshold and in response to that determination, activates a subcooling system. The subcooling system includes a condenser, a second heat exchanger, and a compressor. The condenser removes heat from a second refrigerant. The second heat removes heat from the carbon dioxide refrigerant stored in a flash tank. The compressor compresses the second refrigerant from the second heat exchanger and sends the second refrigerant to the condenser.

Purge systems for heating, ventilation, air conditioning, and refrigeration (HVACR) circuits in chillers can use adsorbent and/or membranes to separate refrigerant from non-condensable gases, allowing the non-condensables to be exhausted while the working fluid can be recovered and returned to the HVACR circuit. The purge systems can include one or more separation chambers including either an adsorbent material or a selectively permeable membrane. The selectively permeable membrane can be solubility-based for its selectivity. Optionally, a pusher pump can be upstream of the separation chambers to pressurize the purge gas through the purge system, including in the separation chamber. The purge system can be controlled using a model correlating pressure differentials in the purge system with purge gas conditions such as non-condensable and working fluid concentrations.

The present disclosure relates to a heat pump and a control method thereof, and to a heat pump including an outdoor unit including a compressor for compressing a first refrigerant, a first outdoor heat exchanger for exchanging heat between the first refrigerant and outdoor air, an expansion mechanism for expanding the first refrigerant, and a second outdoor heat exchanger for exchanging heat between the first refrigerant and a second refrigerant; a first refrigerant pipe which connects the compressor, the first outdoor heat exchanger, and the expansion mechanism, and through which the first refrigerant flows; a pressure sensor disposed in the first refrigerant pipe; a second refrigerant pipe which is connected to the second outdoor heat exchanger, and through which the second refrigerant flows; an indoor heat exchanger which is disposed in the second refrigerant pipe, and exchanges heat between indoor air and the second refrigerant; and a controller configured to determine a supply of the second refrigerant by determining a flow rate of the second refrigerant based on surging occurred in a pressure of the first refrigerant measured by the pressure sensor, so that the flow rate of the second refrigerant flowing through the second refrigerant pipe is determined only by the pressure value of the first refrigerant measured by the pressure sensor disposed in the first pipe, thereby determining the flow rate of the second refrigerant without a separate flow sensor, and a control method thereof.

A temperature controller for a sorption system having an evaporator to produce a gas, a sorber containing a sorption material to sorb the gas during a sorption phase, a flow channel extending between the evaporator and sorber to provide a gas pathway connecting them, a valve to control the rate of gas flow in the flow channel, and a temperature sensor positioned to measure the temperature of an evaporator surface or the air adjacent thereto indicative of an evaporator surface temperature, and generate a temperature signal. The controller includes an inflatable member having first and second inflation states, and a control unit configured to evaluate the temperature signal and in response control the state of inflation of the inflatable member and thereby the operation of the valve to control the rate of gas flow between the evaporator and sorber through the gas pathway.

A cooling vest system is disclosed. The system provides an effective cooling for stabilizing a wearer/individual's body temperature. The system comprises a water tube wrapped around the vest connected to the top of a water block. A water pump is connected to any one end of the water tube to pump the water via the water tube. The system further includes a radiator with a fan for removing excess heat and a heat sink attached below the radiator. The heat sink is fastened to a metal plate using fasteners. The metal plate spreads the cooling to the vest's surface. Also, an electronic circuit and a plurality of batteries are present to power the system. A Peltier cooling chip is mounted to the system to cool the body directly on the solar plexus area of the wearer's chest. Further, the system includes a regulator for monitoring the temperature and water pressure.

The present disclosure relates to an air conditioner. The air conditioner according to an embodiment of the present disclosure includes a compressor which compresses and discharges a refrigerant; an indoor heat exchanger that exchanges heat between the refrigerant and an indoor air; a sensor unit including at least one sensor; and a controller, wherein the controller performs a primary control of the compressor, based on a first target temperature corresponding to a dew point temperature of the indoor air and a current temperature of the indoor heat exchanger, performs a secondary control of the compressor, based on a second target temperature below zero lower than the first target temperature and the current temperature of the indoor heat exchanger, and determines whether to repeatedly perform at least one of the primary control and the secondary control, based on an amount of moisture contained in the indoor air. Various other embodiments are possible.

A refrigeration system including one or more first compressor(s) for compressing a carbon dioxide (CO.sub.2) refrigerant, a main heat rejection system for cooling the CO.sub.2 refrigerant, one or more high pressure expansion device(s) for reducing the pressure of the CO.sub.2 refrigerant, a receiver for storing the CO.sub.2 refrigerant, one or more high pressure expansion device(s), an evaporator and a receiver pressure regulating device. The refrigeration system further includes an auxiliary refrigeration system including an auxiliary compressor arranged to compress at least part of the CO.sub.2 refrigerant and thereafter to direct the compressed CO.sub.2 refrigerant to a heat rejection system.

Thermal management systems are described. These systems include a refrigerant receiver configured to store a refrigerant fluid, an evaporator, a closed-circuit refrigeration system having a closed fluid circuit path, with the refrigerant receiver and evaporator disposed in the closed fluid circuit path, and the closed fluid circuit path including a condenser and compressor. These systems also include a modulation capacity control circuit configured to selectively divert refrigerant vapor flow to the condenser from the compressor by diverting a portion of refrigerant vapor flow (diverted flow) from the compressor to the refrigerant receiver in accordance with cooling capacity demand. These systems also include an open-circuit refrigeration system having an open fluid circuit path with the refrigerant receiver and the evaporator, and an exhaust line that discharges the refrigerant fluid from the exhaust line so that the discharged refrigerant fluid is not returned to the open-circuit and the closed-circuit refrigerant fluid flow paths.

A gas-side stop valve on the gas refrigerant side and a liquid-side stop valve on the liquid refrigerant side are provided in a package of an outdoor unit. A gas-side filter on the gas refrigerant side is mounted on the indoor unit side relative to the gas-side stop valve and inside the package of the outdoor unit. A liquid-side filter 9 on the liquid refrigerant side is mounted on the indoor unit side relative to the liquid-side stop valve and inside the package of the outdoor unit. As a result, it is not necessary to ensure a place for mounting the gas-side filter and the liquid-side filter at the time of installation on site and the workability can be improved.