A louver arrangement configured to be attached to an air-conditioner is provided. The louver arrangement comprises a, first, main louver, and a, second, crank louver. The main louver and the crank louver are rotatably connected to each other. Hereby the main louver and crank louver work in cooperation. The main louver is configured to direct a main air flow from an air-conditioner outlet when mounted on an air-conditioner, and the crank louver is configured to be located closer to a lower wall of the air-conditioner outlet when mounted on an air-conditioner and configured to, at least in some positions, to enable deflection of a fraction of air flow onto the main louver when in use on the air-conditioner.

A system and related method are disclosed for controlling condensation in a space. The system includes a fan and one or more sensors for sensing environmental conditions such as temperature and relative humidity associated with the space and/or objects within the space. For instance, the sensors may sense a surface temperature of an object within the room. The system also includes a controller capable of receiving measurements from the sensor(s) and controlling the fan based on the sensed information. The system may additionally include a heater and/or a damper for transferring outside air into the space, either of which may be controlled by the controller based on the measurements.

A containerized battery system includes a container having a container door, batteries within the container, and an electronically controlled container heater. The system further includes an anti-condensation control system including a access control unit structured to compare an inside dewpoint value to an outside dewpoint value, and operate the electronically controlled container heater to increase an inside temperature of the container to an anti-condensation target temperature. The access control unit is further structured to adjust the door access device to an unrestricted-access state based on the increase to the inside temperature of the container.

An HVAC system includes an evaporator. The evaporator includes a sensor configured to measure a property value (i.e., a saturated suction temperature or a saturated suction pressure) associated with saturated refrigerant flowing through the evaporator. The system includes a variable-speed compressor configured to receive the refrigerant and compress the received refrigerant. The system includes a controller communicatively coupled to the sensor and the variable-speed compressor. The controller monitors the property value measured by the sensor and detects a system fault, based on the monitored property value. In response to detecting the system fault, the controller operates the compressor in a freeze-prevention mode, which is configured to maintain the property value above a setpoint value by adjusting a speed of the variable-speed compressor. This prevents or delays freezing of the evaporator during operation of the system during the detected system fault.

The present disclosure discloses a control method for a multi-split air conditioning system and a multi-split air-conditioning system, the multi-split air conditioning system, including a compressor and a plurality of indoor units respectively arranged on a plurality of parallel branches, the indoor unit including a fan and the control method including: in a cooling mode, when the multi-split air conditioning system needs oil return, the multi-split air conditioning system opening a branch where an indoor unit in an off state is located, determining whether the indoor unit has reached a dewing condition, opening the branch on which the indoor unit is located, and controlling the fan of the indoor unit according to a determination result.

An object is to provide an air conditioning apparatus in which, even when a refrigerant leaks outside a casing, the leaked refrigerant is easily guided to the inside of the casing. In an indoor unit (3) of an air conditioning apparatus (1) that includes a casing (30) having an opening (64a), an indoor heat exchanger (51) disposed in the casing (30), a liquid-side connection pipe (53) or a gas-side connection pipe (54) extending from the indoor heat exchanger (51) to the outside of the casing (30) through the opening (64a), and an indoor-side dew condensation prevention member (71) that covers the periphery of the liquid-side connection pipe (53) or the gas-side connection pipe (54), an end portion of the liquid-side connection pipe (53) or the gas-side connection pipe (54) is used in a state of being covered from the periphery thereof by a connection-side dew condensation prevention member (72) or is covered from the periphery thereof by the indoor-side dew condensation prevention member (71), and there is formed a communication passage (91) that causes a space of a part covered by the dew condensation prevention member at the end portion of the liquid-side connection pipe (53) or the gas-side connection pipe (54) to be in communication with the internal space of the casing (30).

A ventilation and air conditioning system includes: an air conditioner that cools air in an air conditioning room; a plurality of transfer air fans that are installed for a plurality of rooms, which are independent of the air conditioning room, in one-to-one correspondence and each deliver the air in the air conditioning room to a corresponding room; and a system controller. For each of the plurality of rooms, the system controller calculates a dew point temperature in the room on the basis of the temperature and the humidity in the room, determines, on the basis of the calculated dew point temperature in the room and the temperature in the air conditioning room, the occurrence of condensation resulting from delivery of the air in the air conditioning room to the room, and controls, according to the result of the determination, the airflow of the transfer air fan corresponding to the room.

A room ventilation system ventilates a structurally enclosable first room as exemplified by a restroom. A second room adjoins the first room with a shared wall therebetween. A fan assembly is mounted within the shared wall such that the airflow from the fan assembly is directed toward the first room. A vent cover in downstream adjacency to the fan assembly has first louvres for re-directing airflow from the fan assembly in a first oblique, downward direction. A vent cover in upstream adjacency to the fan assembly has second louvres for re-directing airflow from the second room in a second oblique, downward direction. Circuitry, in electrical communication with a power source and the fan motor assembly, includes a switch for enabling the user to selectively power the fan motor thereby directing airflow from the second room into the first room for replacing air within the first room.

An HVAC system includes an evaporator. The evaporator includes a sensor configured to measure a property value (i.e., a saturated suction temperature or a saturated suction pressure) associated with saturated refrigerant flowing through the evaporator. The system includes a variable-speed compressor configured to receive the refrigerant and compress the received refrigerant. The system includes a controller communicatively coupled to the sensor and the variable-speed compressor. The controller monitors the property value measured by the sensor and detects a system fault, based on the monitored property value. In response to detecting the system fault, the controller operates the compressor in a freeze-prevention mode, which is configured to maintain the property value above a setpoint value by adjusting a speed of the variable-speed compressor. This prevents or delays freezing of the evaporator during operation of the system during the detected system fault.

An air mixing device mitigates temperature stratification between two incoming air streams by creation of turbulent airflow through an arrangement of channels in the device. The device also provides selective passage of air for incoming airstreams to achieve functionality for damper control typically associated with separate inlet dampers. A method provides for selectively controlled airflow through the device so effective mixing occurs along with an economizer function to control separate airstreams such as outside air and return air. Existing dampers may be integrated with the air mixing device to control airflow in which flow of one airstream through the device increases as the flow of the other airstream is proportionately decreased. A minimum outside air duct can be incorporated in the mixing device to efficiently satisfy building code requirements regarding monitoring and recording of outside air input to air handling units.