Abstract: A refrigeration cycle apparatus includes a compressor and sets a heating-mode lower limit refrigerant volume flow rate through the compressor. The heating-mode lower limit refrigerant volume flow rate is a lower limit of a volume flow rate in a heating operation. The apparatus controls a rotation speed of the compressor such that the volume flow rate in the heating operation is greater than or equal to the heating-mode lower limit refrigerant volume flow rate. The heating-mode lower limit refrigerant volume flow rate includes a first lower limit for use of an R410A refrigerant and a second lower limit for use of an R32 refrigerant. When using the R32 refrigerant in the refrigeration cycle apparatus designed for the R410A refrigerant, the apparatus performs correction such that the lower limit is increased from the first lower limit to the second lower limit to control the rotation speed of the compressor.

Abstract: A refrigeration cycle apparatus includes a discharge temperature sensor that detects a discharge temperature of refrigerant discharged from a compressor, and a controller that controls the opening degree of an expansion valve. The controller computes an amount of variation of the discharge temperature resulting from varying the opening degree of the expansion valve, computes a ratio of the amount of variation of the discharge temperature to an amount of variation of the opening degree of the expansion valve, and determines the opening degree to be set to the expansion valve on the basis of the opening degree of the expansion valve that causes a change of the ratio.

Abstract: In a double-pipe heat exchanger, a groove non-forming range is set as a non-groove surface in each of, in an inner surface of a heat transfer area increasing pipe, an inner surface of a part of the heat transfer area increasing pipe, which is held in close contact with an inner surface of an outer pipe, and a part of the inner surface of the outer pipe, which defines a second flow path in cooperation with an outer surface of the heat transfer area increasing pipe.

Abstract: A heat pump device that collects heat both from outdoor air and another heat source. When capacity is insufficient in a single operation, a controller determines whether to switch the single operation to a simultaneous operation by comparing a temperature of an additional heat source with a current refrigerant temperature. In a heating operation, the controller switches single operation to simultaneous operation when the temperature of the additional heat source is higher than the current refrigerant temperature, and continues the single operation when the temperature of the additional heat source is equal to or lower than the current refrigerant temperature.

Abstract: A double pipe heat exchanger includes an inner pipe inside which a first fluid passes, an outer pipe that has a diameter larger than the diameter of the inner pipe and that covers the inner pipe, and second fluid passes through a space between the outer pipe and the inner pipe, and a heat transfer area enlargement pipe that is provided in the space and that has a projection-depression shape made to be larger than a length in the pipe-circumferential direction of outer contact portions to be contact areas with the inner wall of the outer pipe, and fin portions between the outer contact portion and the inner contact portion that traverse the space in a pipe cross section come into contact with the outer wall of the inner pipe and the inner wall of the outer pipe in oblique directions.

Abstract: Provided is a heat pump device configured to collect heat both from outside air and another heat source. A controller calculates heat exchange amounts with use of heat exchange performance of each of an air heat-source heat exchanger and an underground heat-source heat exchanger in addition to an outside air temperature and an underground temperature. Then, in switching between a simultaneous operation of causing refrigerant to flow through both of the air heat-source heat exchanger and the underground heat-source heat exchanger and a single operation of selecting the air heat-source heat exchanger or the underground heat-source heat exchanger to cause refrigerant to flow therethrough, the controller selects a heat source having a larger calculated heat exchange amount. In this manner, an appropriate heat source suitable for operation conditions can be selected.

Abstract: When operation of an air-conditioning apparatus starts, an operation determination means determines whether the operation is a cooling operation or a heating operation. If the operation is determined not to be the cooling operation, a discharge gas cooling unit does not perform cooling. On the other hand, if the operation is determined to be the cooling operation, the discharge gas cooling unit cools discharge gas.

Abstract: During heat applying operation, both an air-source heat exchanger that exchanges heat with the atmosphere as a heat source and an earth-source heat exchanger that uses geothermal heat as a heat source serve as evaporators to collect heat from the atmosphere and the geothermal heat. During defrosting operation, while a four-way valve is switched to cause the air-source heat exchanger to serve as a radiator, and the earth-source heat exchanger to serve as an evaporator to collect the geothermal heat, and the collected geothermal heat is collected in the main circuit via the sub-circuit.

Abstract: In a refrigeration cycle system, switching is allowed between a parallel operation mode and a series operation mode. In the parallel operation mode, a refrigerant, upon leaving a load side heat exchanger, parallelly flows through a high-pressure side passage of each of a first internal heat exchanger and a second internal heat exchanger and then flows into an expansion valve. In the series operation mode, the refrigerant, upon leaving the load side heat exchanger, flows through the high-pressure side passage of the first internal heat exchanger, further flows through the high-pressure side passage of the second internal heat exchanger, and then flows through a high-pressure side bypass pipe into the expansion valve.

Abstract: A refrigerating and air-conditioning apparatus suppresses liquid backflow to a compressor with a simple configuration, and reduces annual power consumption. An outdoor unit and an indoor unit are connected to each other by a gas-side connecting pipe and a liquid-side connecting pipe to form a refrigerant circuit in which a compressor, a four-way valve, an indoor heat exchanger, a refrigerant heat exchanger, an expansion valve, an outdoor heat exchanger, and an accumulator are sequentially connected. The refrigerant heat exchanger transfers heat between a high-pressure-side refrigerant flowing between the expansion valve and an outdoor-unit liquid pipe connecting portion and a low-pressure-side refrigerant on an outlet side of the accumulator.

Abstract: When a compressor is in a stopped state and an outside air temperature change rate Tah exceeds zero, a first heating operation is started, and a heating capacity of a compressor heating portion is set in a range not more than a heating capacity upper limit Pmax based on the outside air temperature change rate Tah. A remaining refrigerant liquid amount Ms condensed in the compressor that had not been evaporated is acquired based on the outside air temperature change rate Tah and the heating capacity. If the outside air temperature change rate Tah is zero or below and the remaining refrigerant liquid amount Ms exceeds zero while the compressor is in a stopped state, a second heating operation is started, the compressor heating portion 10 is controlled based on the remaining refrigerant liquid amount Ms, and the refrigerant condensed in the compressor 1 is evaporated.

Abstract: A controller performs a first control that controls a temperature of water (heat medium) flowing out of a heat source device on the basis of an outside air temperature and a temperature difference between chronologically preceding and following outside air temperatures that are detected by an outdoor temperature sensor. The controller controls the temperature of the subject to be controlled to a target temperature by performing the first control.

Abstract: While a compressor is stopped, a change rate of a refrigerant temperature per predetermined time is calculated on the basis of a value detected by a refrigerant temperature sensor, and a heating amount from a compressor heating unit to the compressor is made proportional to the change rate of the refrigerant temperature.

Abstract: Also in a video system in which a device responding to a multiple screen display function and a non-responding device are mixedly present, a communication message for a collaboration of the device which performs a multiple screen display operation is realized without exerting an influence on operations of the non-responding device. A video device including two or more video input ports and capable of simultaneously receiving videos output from multiple video source devices connected to the video input ports is configured so as to perform a predetermined filtering operation or message conversion when transmitting to the other video input ports a communication message for video device control to be converted through the video input ports.

Abstract: An information processing device is provided with plural HDMI connectors through which an audio signal is supplied to the other information processing device. The device allows selection of an audio signal supply destination. The audio signal supply is requested, and the audio signal is supplied to the specified information processing device in the requested arriving order. The information processing device of a specific type is determined as a priority device which is preferentially selected to receive the audio signal. If the information processing device of specific type is determined as the priority device, and supply of the audio signal therefrom is requested, the audio signal is supplied to the priority device by terminating the audio signal supply to the other information processing device. The audio signal may be supplied to plural supply destinations.

Abstract: It is intended to realize an air conditioning system of high operational efficiency without reducing the user's comfort. In an air conditioning system 1, a set temperature determining device 31 determines a target temperature of water to be supplied to an indoor heat exchanger 12, 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 9, and the set temperature difference is a difference between an indoor temperature and a set temperature. A control device 32 controls an outdoor unit 2 in response to the target temperature determined by the set temperature determining device 31.

Abstract: To obtain an air-conditioning apparatus that appropriately determines the state of stagnating refrigerant in a compressor, and suppresses power consumption while the air-conditioning apparatus is not in operation. When a compressor temperature change rate is determined to be higher than a refrigerant temperature change rate, a controller identifies that liquid refrigerant in a lubricant oil in a compressor has been totally gasified, stops energizing a motor unit, and ends a heating operation of the compressor.

Abstract: When a compressor is in a stopped state and an outside air temperature change rate Tah exceeds zero, a first heating operation is started, and a heating capacity of a compressor heating portion is set in a range not more than a heating capacity upper limit Pmax based on the outside air temperature change rate Tah. A remaining refrigerant liquid amount Ms condensed in the compressor that had not been evaporated is acquired based on the outside air temperature change rate Tah and the heating capacity. If the outside air temperature change rate Tah is zero or below and the remaining refrigerant liquid amount Ms exceeds zero while the compressor is in a stopped state, a second heating operation is started, the compressor heating portion 10 is controlled based on the remaining refrigerant liquid amount Ms, and the refrigerant condensed in the compressor 1 is evaporated.

Abstract: Also in a video system in which a device responding to a multiple screen display function and a non-responding device are mixedly present, a communication message for a collaboration of the device which performs a multiple screen display operation is realized without exerting an influence on operations of the non-responding device. A video device including two or more video input ports and capable of simultaneously receiving videos output from multiple video source devices connected to the video input ports is configured so as to perform a predetermined filtering operation or message conversion when transmitting to the other video input ports a communication message for video device control to be converted through the video input ports.

Abstract: An information processing device is provided with plural HDMI connectors through which an audio signal is supplied to the other information processing device. The device allows selection of an audio signal supply destination. The audio signal supply is requested, and the audio signal is supplied to the specified information processing device in the requested arriving order. The information processing device of a specific type is determined as a priority device which is preferentially selected to receive the audio signal. If the information processing device of specific type is determined as the priority device, and supply of the audio signal therefrom is requested, the audio signal is supplied to the priority device by terminating the audio signal supply to the other information processing device. The audio signal may be supplied to plural supply destinations.