Abstract: A computing device calculates a quality of a refrigerant flowing out of a second expansion device on the basis of an inlet liquid enthalpy calculated on the basis of a temperature of the refrigerant flowing into the second expansion device and a saturated gas enthalpy and a saturated liquid enthalpy calculated on the basis of a temperature of the refrigerant flowing out of the second expansion device or a pressure of the refrigerant sucked into a compressor; calculates a liquid-phase concentration and a gas-phase concentration of the refrigerant flowing out of the second expansion device on the basis of the temperature of the refrigerant flowing out of the second expansion device and the pressure of the refrigerant sucked into the compressor; and calculates a composition of the refrigerant circulating in a refrigeration cycle on the basis of the calculated quality, liquid-phase concentration, and gas-phase concentration.

Abstract: An indoor unit of an air-conditioning apparatus includes a controller that controls a refrigeration cycle, an up/down air flow direction plate, and a left/right air flow direction plate, based on information of a person whose image is captured by an imaging device. When the refrigeration cycle is stopped, in a case where the face of the person detected by the imaging device remains stationarily facing the imaging device for a preset recognition time, the controller recognizes the person as one wishing the refrigeration cycle to be activated, and activates the refrigeration cycle.

Abstract: A front and rear integrated vehicle HVAC system includes a front HVAC portion with a front blower and a front vent outlet, and a rear HVAC portion with a rear blower and a rear vent outlet. The system includes a controller that determines a minimum voltage to be supplied to the rear blower to prevent an inverse air flow from being expelled from the rear outlet and/or a rear blower air intake. A voltage supplied to the rear blower is then set as the greater of the minimum rear blower voltage and a current rear blower voltage. The inverse air flow is air flow in the front HVAC portion generated by the front blower and intended for the front vent outlet that seeps into the rear HVAC portion and is expelled from the rear vent outlet and/or the rear blower air intake.

Abstract: Methods and systems for detecting and recovering from control instability caused by impeller stall in a chiller system are provided. In one embodiment, an impeller stall detection and recovery component of a chiller control unit calculates a control error signal frequency spectrum for an evaporator leaving water temperature, determines whether a high frequency signal content of the control error signal frequency spectrum exceeds acceptable limits, and adjusts a surge boundary control curve downward by a predetermined incremental value in order to resolve instability caused by impeller stall.

Abstract: A method of controlling air conditioning to cool servers, the method includes selecting, when the number of operating servers is a certain threshold number or more, a first mode, in which the pressure of a cold aisle is set higher than the pressure of a hot aisle; selecting, when the number of operating servers is less than the certain threshold number, a second mode, in which the pressure of the cold aisle is set equal to the pressure of the hot aisle; and informing the operating servers of whether a current mode is the first mode or the second mode, and when the current mode is the first mode, driving fans of the servers at a minimum rotational speed in a specification, and when the current mode is the second mode, driving the fans of the servers at a rotational speed higher than the minimum rotational speed in the specification.

Abstract: A heat pump system includes a heat source unit having a variable-capacity compressor and a heat-source-side heat exchanger that functions as an evaporator for a refrigerant, and a plurality of usage units connected to the heat source unit and having usage-side heat exchangers that function as radiators for the refrigerant. The operating capacity of the compressor is controlled to bring the discharge pressure of the compressor, or a state quantity equivalent to the discharge pressure, to a first target value. The first target value is determined based on an equivalent target value equivalent to a usage temperature required in individual usage units.

Abstract: An air conditioning system, a set temperature determining device determines a target temperature of water to be supplied to an indoor heat exchanger, based on [“target outflow temperature”=“current outflow temperature”+((“inlet and outlet temperature difference”/“indoor and outdoor temperature difference”)דset temperature difference”)]. The indoor and outdoor temperature difference is a difference between an indoor temperature and an outdoor temperature, the inlet and outlet temperature difference is a difference between temperatures of water at the inlet side and the outlet side of an intermediate heat exchanger, and the set temperature difference is a difference between an indoor temperature and a set temperature. A control device controls an outdoor unit in response to the target temperature determined by the set temperature determining device.

Abstract: A refrigeration system includes a supplemental heat exchanger operably disposed between a condenser and an evaporator. This supplemental heat exchanger is located in selective fluid communication with the air in the conditioned space, and can be toggled between an “invisible” mode in which the heat exchanger acts as a simple fluid conduit between the condenser and evaporator, and a “humidity reduction” mode in which the heat exchanger operates to transfer heat from hot refrigerant to the colder conditioned space. This addition of heat into the conditioned space decreases the relative humidity of the conditioned space and subcools the refrigerant leading to the expansion valve and evaporator. This subcooling of the liquid enables the evaporator to operate at a lower temperature which enhances the moisture removal from the air moving through the evaporator.

Abstract: A cooling box to control temperature so that an internal temperature of the cooling box becomes equal to a set temperature, includes: a control device including an temperature sensor to detect an ambient temperature of the box, and adjust a supply amount of warm air into the box after stopping supply of cold air thereinto based on the ambient temperature; and a door sensor to detect whether an opening connected with the interior of the cooling box is in either an open or closed state, when the door sensor detects a change of the opening from an open to closed state. The control device executes control so that the warm-air-supply-amount reaches a first value until a predetermined period has elapsed, and executes control so that the warm-air-supply-amount reaches a second value smaller than the first value after the predetermined period has elapsed.

Abstract: In a rotary handle for a thermostatically controlled valve, which is arranged on an actuator brought out of a valve housing, having a stop body, which acts together with a stop cam provided on the valve housing. It is provided that the stop body is movable in the rotation direction in such a way that by a relative movement between the stop body and the rotary handle, turning of the rotary handle by a rotation angle greater than 360° is made possible.

Abstract: A high temperature protective valve and the use thereof in a shower head, wherein the high temperature protective valve includes a body, the body having a complete one-way waterway, and also a thermo-sensitive assembly and a pivot valve assembly. The thermo-sensitive assembly is fixed inside the body and has a memory alloy body which can be immersed in the waterway and extend and retract along the direction of the flow. The pivot valve assembly is also fixed inside the body downstream waterway of the thermo-sensitive assembly. The pivot valve assembly has a pivot valve plug which is controllable by the thermo-sensitive assembly so as to cut off the waterway. The high temperature protective valve of such a structure has a fast response and can achieve good protective effects at a high temperature.

Abstract: A method of refrigeration control through a refrigeration system of a refrigerated transport container includes performing a defrost cycle on the refrigeration system by activating a heat source; and restarting the refrigeration system after the defrost cycle has completed, wherein restarting the refrigeration system includes performing a liquid slugging avoidance process including: initiating a compressor of the refrigeration system at a speed; opening a pressure equalization valve in parallel with the compressor in response to the initiating; opening a liquid valve in series between a condenser and an evaporator after opening of the pressure equalization valve; and closing the pressure equalization valve after a period of time.

Abstract: A controller for controlling a refrigeration unit, a method, and a refrigeration system are disclosed. In an illustrative embodiment, a controller stores instructions for a first refrigeration setting and a second refrigeration setting, tracks a cumulative average temperature in a refrigeration element, and activates either the first refrigeration setting or the second refrigeration setting. The first refrigeration setting has a lower average power consumption and a higher range of temperature variation than the second refrigeration setting.

Abstract: Methods for and systems of controlling operation of one or more chillers in a primary-secondary chiller plant system. The chillers utilize a set point temperature that is based upon measuring a temperature of water at a supply side of the load on the secondary loop.

Abstract: A desuperheater spraying valve assembly includes an actuator coupled to a plug with a valve seat in the proximity of the plug. The plug is affixed to an actuator rod which transverses the body of the valve assembly. A spray tube may be affixed to the valve seat and at least one spray nozzle is affixed to the spray tube. The plug and the valve seat are conical in shape and when the plug is inserted into the valve, they form a seal.

Abstract: A heat source-side heat exchanger fan blowing air to a heat source-side heat exchanger performing heat exchange with refrigerant compressed in a compressor is controlled. A current detected temperature at a current time is converted to obtain a current converted high pressure value at the current time. The current converted high pressure is a pressure of refrigerant inside a high pressure-side pipe of the compressor. The current detected temperature is a temperature detected by a temperature detector attached to the heat source-side heat exchanger. A past detected temperature is converted to obtain a past converted high pressure value at the past time. A speed of the heat source-side heat exchanger fan is determined using a corrected converted high pressure value. The corrected converted high pressure value is obtained by correcting the current converted high pressure value based on the past converted high pressure value.

Abstract: An air-conditioning apparatus includes a high-pressure side pressure detection device detecting high-pressure side pressure, a low-pressure side pressure detection device detecting low-pressure side pressure, a high-low pressure bypass pipe connecting a pipe on a discharge side of a compressor and a pipe on a suction side of the compressor, a bypass expansion device disposed in the high-low pressure bypass pipe, a high-pressure side temperature detection device detecting high-pressure side temperature, and a low-pressure side temperature detection device detecting low-pressure side temperature; an outdoor unit side controller that detects circulation composition of refrigerant on the basis of the high-pressure side pressure, the low-pressure side pressure, the high-pressure side temperature, and the low-pressure side temperature; and a relay unit side controller performing at least one of a calculation of evaporating temperature and degree of superheat, and a calculation of condensing temperature and degree o

Abstract: The invention relates to a thermostatic mixing valve with integrated flow diverter provided with a first coupling for a control lever for the flow rate adjustment and the flow diversion through a valve group that is housed between a base and a cylindrical body, and with a second coupling for a knob for the temperature adjustment through a thermostatic device, said valve including a member for the transmission of the flow rate adjustment and flow diversion control that directly connects the control lever to the valve group passing through the cylindrical body without moving it, the latter being also enclosed within an external casing secured to the base and achieving a watertight sealing with the base.

Abstract: An air-conditioning apparatus includes a controller which calculates a composition ratio of a refrigerant mixture using a high-pressure-side pressure of a refrigerant discharged from a compressor, a low-pressure-side pressure of a refrigerant to be sucked into the compressor, a high-pressure-side temperature of a refrigerant at an inlet side of a second expansion device in a high/low pressure bypass pipe, and a low-pressure-side temperature of a refrigerant at an outlet side of the second expansion device in the high/low pressure bypass pipe and which determines whether to open or close a bypass-channel opening/closing device.

Abstract: A method for operating a device at a desired temperature is described. In one example, current supplied to a heater that melts a wax medium or material controlling flow through a valve is adjusted to reduce valve opening and closing delay. The method may improve device temperature control, thereby reducing device emissions, enhancing device performance, and improving device durability.