An air-conditioning apparatus includes refrigerant systems that each include an outdoor unit and indoor units and that air-condition a single room, and circulators for making a temperature distribution in the room uniform. The air-conditioning apparatus determines a load on each of the two refrigerant systems in operation, and, if it is determined that improvement of operating efficiency is possible on the basis of the determination result, performs a system-selective operation in which operation of one of the refrigerant systems determined to be under a low load is stopped and the other refrigerant system determined to be under a high load is selectively performed, and causes the circulators to transport blown air blown from the indoor units of the refrigerant system determined to be under a high load to an air-conditioned zone of the refrigerant system determined to be under a low load.

The purpose of the present invention is to avoid frequent repetition of an increase/decrease stage caused by the inclusion, in a heat source system, of a machine the capacity of which has been degraded. A heat source system of the present invention is provided with a plurality of heat source machines. A higher-level control device (20) controls each of the heat source machines so that a heat medium delivery temperature, which is the temperature of a heat medium being supplied to an external load, will be a set temperature. The higher-level control device (20) is provided with a number-of-machines control unit (22), a degraded machine detection unit (24), and a priority ranking modification unit (25). The number-of-machines control unit (22) controls the number of heat source machines in accordance with operational priority ranking information in which each of the heat source machines and an operational priority ranking are associated together. The degraded machine detection unit (24) detects, as a capacity-degraded machine, a heat source machine that satisfies a predetermined capacity degradation condition, from among operating heat source machines. The priority ranking modification unit (25), if a capacity-degraded machine has been detected, modifies to a lowest position the operational priority ranking of the capacity-degraded machine in the operational priority ranking information.

A luminaire for lighting and for distribution of conditioned air within a space includes a housing having a lighting element, a duct opening, and at least one air vent coupled to the duct opening. The at least one air vent is configured to deliver conditioned air to the space. A method of controlling light and conditioned air delivery within a space, by a single combined lighting and conditioned air fixture, includes providing control and power signals to a controller coupled to the single combined lighting and conditioned air fixture, controlling lighting functions via the controller, and controlling conditioned air functions via the controller.

An air information management apparatus includes: an obtainer that obtains an air state of a target area from a sensor installed in the target area or an area surrounding the target area; storage in which an air state record that is a record of the air state obtained by the obtainer is stored; an information processor that derives, from the air state record stored in the storage, statistical information on the air state measured for the target area during a predetermined period; and a display controller that causes the display apparatus to display, as information indicating an air environment in the target area, the statistical information derived by the information processor.

An environmental control device (100, 200), such as a thermostat, is disclosed. The environmental control device (100, 200) has one or more terminals (104, 104a-104i) for connecting to an HVAC system (14) and performs over current management of the terminal (104, 104a-104i) when connected to the HVAC system (14).

A method of defrosting an energy recovery ventilator unit. The method comprises defrosting an energy recovery ventilator unit. The method comprises activating a defrost process of an enthalpy-exchange zone of the energy recovery ventilator unit when an air-flow blockage in the enthalpy-exchange zone coincides with a frost threshold in the ambient environment surrounding the energy recovery ventilator unit. The method also comprises terminating the defrost process when a heat transfer efficiency across the enthalpy-exchange zone returns to within 10 percent of a pre-frosting heat transfer efficiency wherein, the heat transfer efficiency is proportional to a temperature difference between an intake air zone of the energy recovery ventilator and a supply air zone of the energy recovery ventilator divided by a temperature difference between an return air zone of the energy recovery ventilator and the intake air zone.

An air-conditioning management apparatus configured to control operation of a plurality of air conditioners includes a plurality of indoor units, the air-conditioning management apparatus including: a control unit configured to, during normal control of maintaining an indoor temperature, carry out air-conditioning control of shifting control from the normal control to power-saving control when each piece of load data respectively indicating surrounding environments of the plurality of indoor units satisfies a specific load condition, in which, even in a case in which pieces of load data of some of the plurality of indoor units do not satisfy the load condition, the control unit shifts the control to the power-saving control when it is predicted, based on history of past operation state data of the some of the plurality of indoor units, that a level of comfort of an indoor environment does not decrease due to the shift to the power-saving control.

Methods and systems for detecting and identifying faults in air-cooled systems are provided. The systems and methods may utilize a prediction model based on an energy balance relationship. In certain methods, one or more measured parameters associated with the air-cooled system may be compared with corresponding parameters generated by the prediction model. One or more faults may be detected and identified based upon deviations between the measured and detected system parameters.

A variable refrigerant volume system and control method thereof. The variable refrigerant volume system comprises: a compressor (1); a four-way valve (19); an indoor unit; a liquid tube (22), the first end thereof being connected to the indoor unit, the second end thereof being connected to the third valve port of the four-way valve (19), and a condenser (18) being provided on the liquid tube (22); a low pressure air pipe (23), the first end thereof being connected to the indoor unit, and the second end thereof being connected to the fourth valve port of the four-way valve (19); a refrigerant adjustment tank (6), the first port thereof being connected to the liquid tube (22), the second port thereof being connected to the low pressure air pipe (23), and the third port thereof optionally communicating with the liquid tube (22) or the low pressure air pipe (23). The refrigerant adjustment tank (6) provides refrigerant to the variable refrigerant volume system when the system requires more refrigerant, and recycles refrigerant from the variable refrigerant volume system when the system requires less refrigerant. The variable refrigerant volume system can flexibly control a refrigerant recycling amount in accordance with a refrigerant operation situation, thus ensuring system reliability.

An object of the present invention is to obtain a wiring board that achieves both of high mounting position accuracy and high solder strength in a circumferential direction. On the wiring board, an electronic component including a plurality of pins is mounted. The wiring board includes a base substrate, a plurality of wires provided on the base substrate, a resist covering the wires, and a plurality of footprints connected to the wires and having entire surfaces exposed in openings of the resist. The pins are soldered to the footprints by reflow. In the openings of the resist, directions in which the pins are led out are parallel to directions in which the wires are led out.