An HVAC system with a reheat coil is described, the system includes a compressor, a micro-channel condenser and an evaporator. A reversing valve is connected to the compressor, the micro-channel condenser and the reheat coil. The reversing valve is used to direct the refrigerant from the compressor to the micro-channel condenser in a normal mode, and to direct the refrigerant from the compressor to the reheat coil in a reheat mode. The reversing valve can be switched from normal mode to reheat mode when a high pressure condition is detected at an input to the micro-channel condenser, and switched back from reheat mode to normal mode when the high pressure condition has resolved or an amount of time has passed. In the normal mode the refrigerant is returned from the reheat coil into a refrigerant line between the evaporator and the compressor through a restrictor.

An HVAC system with a reheat coil is described, the system includes a compressor, a micro-channel condenser and an evaporator. A reversing valve is connected to the compressor, the micro-channel condenser and the reheat coil. The reversing valve is used to direct the refrigerant from the compressor to the micro-channel condenser in a normal mode, and to direct the refrigerant from the compressor to the reheat coil in a reheat mode. The reversing valve can be switched from normal mode to reheat mode when a high pressure condition is detected at an input to the micro-channel condenser, and switched back from reheat mode to normal mode when the high pressure condition has resolved or an amount of time has passed. In the normal mode the refrigerant is returned from the reheat coil into a refrigerant line between the evaporator and the compressor through a restrictor.

A device for reducing air humidity in a room, the device comprising: a housing including an air inlet cross section and an air outlet cross section; a fan unit configured to take air into the air inlet cross section; a refrigeration unit configured to cool the air below a dew point; a first temperature measuring device configured to measure an air temperature of the air taken into the air inlet cross section; a second temperature measuring device configured to measure an air humidity of the air taken into the air inlet cross section; a third temperature measuring device configured to measure a surface temperature of a room boundary surface of the room; and a control device configured to process measured values from the first temperature measuring device, the second temperature measuring device and the third temperature measuring device to control the device for reducing the air humidity in the room.

A device for reducing air humidity in a room, the device comprising: a housing including an air inlet cross section and an air outlet cross section; a fan unit configured to take air into the air inlet cross section; a refrigeration unit configured to cool the air below a dew point; a first temperature measuring device configured to measure an air temperature of the air taken into the air inlet cross section; a second temperature measuring device configured to measure an air humidity of the air taken into the air inlet cross section; a third temperature measuring device configured to measure a surface temperature of a room boundary surface of the room; and a control device configured to process measured values from the first temperature measuring device, the second temperature measuring device and the third temperature measuring device to control the device for reducing the air humidity in the room.

An air-conditioning control system includes an air-conditioning device mounted in a host vehicle, a determination unit mounted in the host vehicle or a server and configured to determine whether a boarding position at which a boarding event in which an occupant boards the host vehicle occurs is a point with a predetermined attribute, and a control unit mounted in the host vehicle and configured to control the air-conditioning device based on a determination result from the determination unit. The control unit sets a ventilation capacity of the air-conditioning device to be greater when the determination unit determines that the boarding position is a point with the predetermined attribute than when the determination unit does not determine that the boarding position is a point with the predetermined attribute.

An air-conditioning control system includes an air-conditioning device mounted in a host vehicle, a determination unit mounted in the host vehicle or a server and configured to determine whether a boarding position at which a boarding event in which an occupant boards the host vehicle occurs is a point with a predetermined attribute, and a control unit mounted in the host vehicle and configured to control the air-conditioning device based on a determination result from the determination unit. The control unit sets a ventilation capacity of the air-conditioning device to be greater when the determination unit determines that the boarding position is a point with the predetermined attribute than when the determination unit does not determine that the boarding position is a point with the predetermined attribute.

A system for modulating hot gas reheat operation of a heating, ventilation, and/or air conditioning (HVAC) system with multiple compressors, wherein the HVAC system is configured to regulate air provided to multiple zones. The system includes a controller configured to respond to a call for dehumidification in the absence of a call for cooling by sequentially energizing a first compressor of the multiple compressors in a reheat mode of the first compressor, energizing a second compressor of the multiple compressors in a cooling mode of the second compressor, energizing a third compressor of the multiple compressors in a reheat mode of the third compressor initially at full capacity, and energizing a fourth compressor of the multiple compressors in a cooling mode of the fourth compressor.

A system for modulating hot gas reheat operation of a heating, ventilation, and/or air conditioning (HVAC) system with multiple compressors, wherein the HVAC system is configured to regulate air provided to multiple zones. The system includes a controller configured to respond to a call for dehumidification in the absence of a call for cooling by sequentially energizing a first compressor of the multiple compressors in a reheat mode of the first compressor, energizing a second compressor of the multiple compressors in a cooling mode of the second compressor, energizing a third compressor of the multiple compressors in a reheat mode of the third compressor initially at full capacity, and energizing a fourth compressor of the multiple compressors in a cooling mode of the fourth compressor.

An air quality adjustment system includes an adsorption-desorption portion that adsorbs a target substance in air and desorbs the target substance adsorbed by the adsorption-desorption portion. The adsorption-desorption portion accumulates an energy in adsorbing the target substance and releases, in desorbing the target substance, at least part of the energy accumulated.

An air quality adjustment system includes an adsorption-desorption portion that adsorbs a target substance in air and desorbs the target substance adsorbed by the adsorption-desorption portion. The adsorption-desorption portion accumulates an energy in adsorbing the target substance and releases, in desorbing the target substance, at least part of the energy accumulated.