Abstract: An air-conditioning system includes a pump that sends, to an evaporator, a cooling fluid that exchanges heat with a refrigerant at the evaporator, and a first heat exchanger that exchanges heat between ambient air and the cooling fluid that has undergone the heat exchange at the evaporator. A sensible heat exchange cycle is formed by annularly connecting the evaporator, the heat exchanger, and the pump by using a pipe. This system is also includes an air-sending unit that sends air to a second heat exchanger, moisture absorbing-and-desorbing devices that are provided at a passage of the air sent by the air-sending unit and that are disposed in front of and behind the first heat exchanger, and an air-path switching device that reverses a passing direction of air passing through the moisture absorbing-and-desorbing device, the first heat exchanger, and the moisture absorbing-and-desorbing device.

Abstract: An air-conditioning system includes at least one outdoor unit including a compressor, a four-way valve, and an outdoor heat exchanger, at least one indoor unit including an indoor unit expansion valve and an indoor unit heat exchanger, and at least one humidity control device including a humidity control device expansion valve, a humidity control device heat exchanger, and first and second water adsorption/desorption devices. The compressor, the four-way valve, the outdoor heat exchanger, the indoor unit expansion valve, the indoor unit heat exchanger, the humidity control device expansion valve, and the humidity control device heat exchanger are connected to each other with pipes so as to constitute a refrigerant circuit.

Abstract: Provided are a refrigeration cycle that is formed by connecting a compressor, a condenser, expansion means, and an evaporator and that performs cooling operation; an evaporator heating device that heats the evaporator; a drain pan that receives drain-water from the evaporator and drains the drain-water; a drain-pan heating device that heats the drain pan; frost detecting means including a light-emitting element that emits light to the evaporator and a light-receiving element that receives reflected light from the evaporator and outputs a voltage according to the reflected light; and a control device that controls on-off operation of the evaporator heating device and the drain-pan heating device. The control device determines a frosting condition on the evaporator from an output of the frost detecting means and individually controls the evaporator heating device and the drain-pan heating device in accordance with the determination result.

Abstract: A refrigeration cycle that is formed by connecting a compressor, a condenser, an expansion valve, and an evaporator and that performs cooling operation; an evaporator heating device that heats the evaporator; a drain pan that receives drain-water from the evaporator and drains the drain-water; a drain-pan heating device that heats the drain pan; a frost detecting device including a light-emitting element that emits light to the evaporator and a light-receiving element that receives reflected light from the evaporator and outputs a voltage according to the reflected light; and a control device that controls on-off operation of the evaporator heating device and the drain-pan heating device. The control device determines a frosting condition on the evaporator from an output of the frost detecting device and individually controls the evaporator heating device and the drain-pan heating device in accordance with the determination result.

Abstract: In a heat pump apparatus, it is aimed to enhance efficiency of a defrost operation by reducing a loss of heat radiation during the defrost operation and reducing a compressor input during the defrost operation. The heat pump apparatus includes a main refrigerant circuit in which a compressor, a first heat exchanger, an expansion mechanism, and a second heat exchanger are connected sequentially, and also includes a bypass circuit including an on-off valve and providing a connection by bypassing the expansion mechanism. The main refrigerant circuit includes a four-way valve that switches between a heating operation and the defrost operation by switching an order in which the refrigerant circulates through the main refrigerant circuit. The main refrigerant circuit also includes a first temperature detection unit and a second temperature detection unit. Based on values detected by these temperature detection units, a degree of superheat of the first heat exchanger during the defrost operation is computed.

Abstract: A refrigerating device that forms a refrigerating cycle in which a plurality of outdoor machines 1a and 1b provided at least with compressors 2a and 2b, condensers 4a and 4b, and accumulators 5a and 5b respectively and an indoor machine 20 provided with decompressing means 21 and an evaporator 22 are connected in parallel by piping, having oil return pipes 13a and 13b that return refrigerator oil stored in the accumulators into the compressors, an oil equalizing pipe 10 that connects the accumulators to each other, and a controller 30 that controls an operation of the compressor and on/off of an electromagnetic valve 12a deposed on the oil equalizing pipe.

Abstract: A mode selection unit selects a continuous operation mode when a dehumidifying operation is started. When an indoor temperature is less than or equal to a set first temperature threshold and indoor humidity is greater than a set humidity threshold in the continuous operation mode, the mode selection unit selects an intermittent operation mode. When the indoor temperature is less than or equal to a set second temperature threshold that is greater than the first temperature threshold and the indoor humidity is less than or equal to the set humidity threshold in the intermittent operation mode, the mode selection unit selects an operation stop mode.

Abstract: A correspondence determination operation is performed. The correspondence determination operation differs a direction of distribution or a flow rate of a refrigerant flowing in one or some of use units among a plurality of use units to that of the other use units and determines, on the basis of a refrigerant temperature of the use unit, a location of a non-correspondence between a branch port that is connected to the use unit with refrigerant pipes and a set branch port that is obtained in accordance with the wire connection.

Abstract: A controller of an air-conditioning apparatus includes an operation control unit that controls operation of a compressor of a heat source unit based on target indoor temperatures of rooms, an unoccupied room detecting unit that detects an unoccupied room where no person is present among the rooms, and a correction amount setting unit that sets a temperature correction amount for correcting the target indoor temperature in a room controller of the unoccupied room detected by the unoccupied room detecting unit to reduce an air conditioning load for the unoccupied room. After the target indoor temperature is corrected by using the temperature correction amount in the room controller, when the operation capacity of the compressor controlled by the operation control unit is smaller than or equal to a preset operation capacity, the correction amount setting unit resets the temperature correction amount to be decreased by an adjustment amount.

Abstract: Provided is an oil level detection device to be mounted on a refrigerating and air-conditioning apparatus, the oil level detection device being configured to detect an oil level of oil accumulated inside a compressor forming the refrigerating and air-conditioning apparatus. The oil level detection device includes an oil level detection unit installed on an outer surface of the compressor and configured to detect a temperature of an installation position, a sensor output unit configured to output, to the refrigerating and air-conditioning apparatus, a signal for changing an operation state of the refrigerating and air-conditioning apparatus, and a determination unit configured to determine depletion of the oil accumulated inside the compressor based on measurement values obtained by the oil level detection unit at least after an output of the signal to be output from the sensor output unit.

Abstract: A refrigerating apparatus according to the present invention includes: a refrigerating circuit in which a refrigerant that is discharged from a compressor is conveyed under pressure sequentially to a first flow rate controlling apparatus, a heat storing tank, a condenser, a first decompressing apparatus, and an evaporator, and is recycled to the compressor; a defrosting circuit in which the refrigerant that is discharged from the compressor is conveyed under pressure sequentially to the first flow rate controlling apparatus, the heat storing tank, the first decompressing apparatus, and the evaporator, and is recycled to the compressor; and a flow channel switching apparatus that connects an outlet side of the heat storing tank to an inlet side of the condenser or to an inlet side of the first decompressing apparatus to form the refrigerating circuit or the defrosting circuit.

Abstract: A refrigeration cycle apparatus Including a refrigerant circuit configured to circulate refrigerant to a compressor, an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger, the compressor being connected to the indoor heat exchanger by a gas extension pipe, the expansion valve being connected to the outdoor heat exchanger by a liquid extension pipe; pressure sensors and temperature sensors to detect an operating state amount of the refrigerant circuit; and a controller to execute refrigerant-leakage detection operation of detecting refrigerant leakage by calculating a refrigerant amount in the refrigerant circuit based on the operating state amount detected by the pressure sensors and the temperature sensors, and comparing the calculated refrigerant amount with a reference refrigerant amount. The controller controls a quality of the refrigerant at an outlet of the liquid extension pipe to be in a range from 0.1 to 0.7 in the refrigerant-leakage detection operation.

Abstract: A humidity control apparatus and an air-conditioning system are capable of controlling the latent heat processing amount and the sensible heat processing amount in accordance with an indoor heat load without decreasing the operation efficiency. Every time an air route is switched to an air route A or an air route B, the route maintenance time for the switched air route is set on the basis of the heat load within a dehumidification target space, and switching of switching devices is controlled such that the set route maintenance time is ensured.

Abstract: Maximum evaporating temperature setting values and minimum evaporating temperature setting values in an indoor heat exchanger and a ventilator cooler are determined in accordance with outdoor air temperature and humidity, evaporating temperature setting values in the indoor heat exchanger and the ventilator cooler are set to be between the respective maximum evaporating temperature setting values and the respective minimum evaporating temperature setting values, and evaporating temperatures in the indoor heat exchanger and the ventilator cooler are controlled so as to be the respective evaporating temperature setting values.

Abstract: A first heat exchanger, a desiccant block, and a second heat exchanger are arranged in series. Further, in a dehumidifying operation, a first operation mode and a second operation mode are alternately repeated. In the first operation mode, the first heat exchanger is operated as a condensor or a radiator and the second heat exchanger is operated as an evaporator. In the second operation mode, the first heat exchanger is operated as the evaporator and the second heat exchanger is operated as the condensor or the radiator. Further, an interval between fin surfaces of a plurality of fins in each of the first heat exchanger and the second heat exchanger is set to 1.5 mm to 3.0 mm so that drainage performance for dew condensation on the fin surfaces is enhanced to reduce an amount of the dew condensation stagnating on the fin surfaces and increase a dehumidifying amount.

Abstract: A dehumidifying apparatus controls the amount of refrigerant flowing into a third heat exchanger serving as a condenser, so as to secure the amount of heat required for defrosting.

Abstract: A first heat exchanger, a desiccant block, and a second heat exchanger are arranged in series. In a dehumidifying operation, a first operation mode and a second operation mode are alternately repeated. In the first operation mode, the first heat exchanger is operated as a condensor or a radiator and the second heat exchanger is operated as an evaporator. In the second operation mode, the first heat exchanger is operated as the evaporator and the second heat exchanger is operated as the condensor or radiator. A pressure reducing amount in the first operation mode is controlled to be smaller than in the second operation mode so that a degree of superheat in the evaporator (second heat exchanger in the first operation mode, first heat exchanger in the second operation mode) in each of the first operation mode and the second operation mode is appropriately controlled to increase a dehumidifying amount.

Abstract: An air passage that connects an inlet port that sucks air from a dehumidification target space and an outlet port that supplies air to the dehumidification target space; a heating device that heats the air; a first moisture adsorption/desorption device releasing moisture into air that has a relatively low humidity and absorbing moisture from air that has a relatively high humidity; a second moisture adsorption/desorption device disposed so as to be spaced apart from the first moisture adsorption/desorption device, a cooling device cooling air that has been humidified; and switching devices switching between an air path passing air through the first moisture adsorption/desorption device, the cooling device, and the second moisture adsorption/desorption device in this order, and an air path in which the air passes through the second moisture adsorption/desorption device, the cooling device, and the first moisture adsorption/desorption device in this order.

Abstract: A refrigerating and air-conditioning apparatus including a refrigerant circuit, which in turn includes an outdoor unit, and an indoor unit, connected by an extension pipe. The apparatus further includes a control unit having a memory, and is configured to calculate an internal volume of the extension pipe and calculate a standard refrigerant amount, serving as a criterion for determining whether the refrigerant is leaked from the refrigerant circuit, on the basis of the calculated refrigerant extension pipe internal volume. The memory is configured to store the refrigerant extension pipe internal volume and the standard refrigerant amount.

Abstract: An air-conditioning system is configured to determine an evaporating temperature control range of a first refrigerant circuit on the basis of the temperature of outdoor air, control an evaporating temperature of the first refrigerant circuit to a target evaporating temperature determined within the evaporating temperature control range of the first refrigerant circuit, determine an evaporating temperature control range of a second refrigerant circuit on the basis of the humidity of the outdoor air, and control an evaporating temperature of the second refrigerant circuit to a target evaporating temperature determined within the evaporating temperature control range of the second refrigerant circuit.