A refrigerant leak management system includes a return inlet assembly and a purge exhaust outlet assembly. The system also includes a sensor configured to detect refrigerant proximate an air handling enclosure of a HVAC unit. The system further includes a controller configured to control the system to drive air from a conditioned interior space of a building into an external environment via the purge exhaust outlet assembly when the sensor detects the refrigerant proximate the air handling enclosure by: actuating the return inlet assembly to close the return inlet assembly, actuating the purge exhaust outlet assembly to open the purge exhaust outlet assembly, and activating a reversible supply fan of the HVAC unit in a reverse direction.

The present disclosure relates to a heating, ventilating, and air conditioning (HVAC) system that includes a refrigerant circuit and a sensor configured to measure a refrigerant concentration external to the refrigeration circuit. The HVAC system also includes a controller that is communicatively coupled to the sensor and to an economizer. The controller is configured to control a flow of environmental air into the HVAC system. The controller is further configured to increase a ratio of the flow of environmental air relative to a flow of return air from a conditioned interior space of a building when the sensor measures the refrigerant concentration above a predetermined threshold concentration.

A wall mounted heat exchanger including a plurality of panels. Individual panels may include a first end, a second end, a first sidewall, a second sidewall, a first gap disposed along the second end, and a second gap disposed along the second sidewall. A first plurality of panels may be arranged such that first ends of the first plurality of panels are co-planar with second ends of a second plurality of panels and first sidewalls of the first plurality of panels are co-planar with second sidewalls of the second plurality of panels. The first plurality of panels and the second plurality of panels, when arranged, may form a plurality of first inlets from the second gap, a plurality of first outlets from the first gap, a plurality of second inlets from the second gap, and a plurality of second outlets from the first gap.

A building panel may be installed below a slab in the construction of buildings. The building panel supports the slab and also provides a ventilation layer that may be depressurized to eliminate or reduce infiltration of radon gas into the building. The ventilation layer may comprise channels which provide a two-dimensionally interconnected void. Ventilation panels which include collars for connecting to ventilation systems may be provided. The panels may be installed directly on compacted soil. The building panels may additionally provide sub-slab insulation and/or a capillary break for water drainage. In some embodiments the building panels are formed substantially entirely of thermal insulating material such as rigid polystyrene foam. In an example embodiment the panels are approximately 4 inches thick and have a grid of intersecting channels formed on an underside of the panels.

The present disclosure sucks air in hospital room using a compressor to maintain an inner portion of the hospital room in a negative pressure state, and creates a high-temperature and humid environment by a water spray, the compressor, and a sterilization chamber to kill bacteria or viruses. In addition, the compressor uses power generated by a turbine, and is configured so that heat of air coming out of the compressor is recovered to a suction side of the compressor, such that efficiency of a system may be secured. Further, some of clean air generated while passing through the sterilization chamber may be directly supplied again to the hospital room through a bypass means.

The present disclosure sucks air in hospital room using a compressor to maintain an inner portion of the hospital room in a negative pressure state, and creates a high-temperature and humid environment by a water spray, the compressor, and a sterilization chamber to kill bacteria or viruses. In addition, the compressor uses power generated by a turbine, and is configured so that heat of air coming out of the compressor is recovered to a suction side of the compressor, such that efficiency of a system may be secured. Further, some of clean air generated while passing through the sterilization chamber may be directly supplied again to the hospital room through a bypass means.

A building panel may be installed below a slab in the construction of buildings. The building panel supports the slab and also provides a ventilation layer that may be depressurized to eliminate or reduce infiltration of radon gas into the building. The ventilation layer may comprise channels which provide a two-dimensionally interconnected void. Ventilation panels which include collars for connecting to ventilation systems may be provided. The panels may be installed directly on compacted soil. The building panels may additionally provide sub-slab insulation and/or a capillary break for water drainage. In some embodiments the building panels are formed substantially entirely of thermal insulating material such as rigid polystyrene foam. In an example embodiment the panels are approximately 4 inches thick and have a grid of intersecting channels formed on an underside of the panels.

An indoor unit apparatus of a split-type air conditioner and a method for using the same are provided, which can realize both of an impinging jet ventilation manner and a displacement ventilation manner. A thin air layer can be formed on the ground through using the indoor unit apparatus of a split-type air conditioner, and the indoor unit apparatus of a split-type air conditioner is adapted to be used both in summer and in winter.

An indoor unit apparatus of a split-type air conditioner and a method for using the same are provided, which can realize both of an impinging jet ventilation manner and a displacement ventilation manner. A thin air layer can be formed on the ground through using the indoor unit apparatus of a split-type air conditioner, and the indoor unit apparatus of a split-type air conditioner is adapted to be used both in summer and in winter.

A wall vent comprising an outlet portion and a cover configured to be coupled to the outlet portion. The outlet portion can include a first cylindrical body configured to extend through a wall, a first opening extending through the first cylindrical body, a connection port located on a first end of the first cylindrical body and configured to connect to an exhaust of the air conditioning unit, and a first plate coupled to the first end of the first cylindrical body. The cover can include a second cylindrical body and a second plate. When the second cylindrical body is within the first opening of the first cylindrical body, at least a portion of the second cylindrical body extends into the first opening of the first cylindrical body and the second plate covers the first opening extending through the first cylindrical body.