A suction port and a blow-out port are formed in a casing. A fan is provided in the casing. Under a test condition that a blower is provided in such a way that a reference position of the blow-out port is a position that is separated by 2000 mm upward from a floor, an airflow adjusting mechanism adjusts, in a wide mode, a flow of air blown out from the blow-out port so that an average airflow speed in a first range and an average airflow speed in a second range are approximately equal to each other and so that a ratio of an average airflow speed in a third range to the average airflow speed in the first range is less than 1.5.

A suction port and a blow-out port are formed in a casing. A fan is provided in the casing. Under a test condition that a blower is provided in such a way that a reference position of the blow-out port is a position that is separated by 2000 mm upward from a floor, an airflow adjusting mechanism adjusts, in a wide mode, a flow of air blown out from the blow-out port so that an average airflow speed in a first range and an average airflow speed in a second range are approximately equal to each other and so that a ratio of an average airflow speed in a third range to the average airflow speed in the first range is less than 1.5.

An air circulation device includes a suction section configured to suck indoor air, and a blower section configured to blow the air sucked by the suction section into a room. The air is in a form of a vortex ring. The air circulation device is operable in at least a first mode in which the vortex ring blown therefrom reaches a wall surface of the room.

A diffuser assembly for a heating, ventilation, and air conditioning (HVAC) system includes a housing having a wall and a passage formed in the wall. The diffuser assembly also includes a first adjustment panel moveably coupled to the wall and having a first flange and a second adjustment panel moveably coupled to the wall and having a second flange. The first flange and the second flange define at least a portion of an inlet port of the diffuser assembly that extends through the passage. The inlet port is configured to fluidly couple to a duct and direct an air flow from the duct into an interior volume of the housing. The first adjustment panel and the second adjustment panel are configured to translate along the wall to adjust a size of the inlet port.

A diffuser assembly for a heating, ventilation, and air conditioning (HVAC) system includes a housing having a wall and a passage formed in the wall. The diffuser assembly also includes a first adjustment panel moveably coupled to the wall and having a first flange and a second adjustment panel moveably coupled to the wall and having a second flange. The first flange and the second flange define at least a portion of an inlet port of the diffuser assembly that extends through the passage. The inlet port is configured to fluidly couple to a duct and direct an air flow from the duct into an interior volume of the housing. The first adjustment panel and the second adjustment panel are configured to translate along the wall to adjust a size of the inlet port.

A screen cover for attaching to an open end of a conduit of a water heater is provided. The screen cover includes a first diametric portion having a first diameter and a second diametric portion having a second diameter. The first diameter is greater than the second diameter. The first and second diametric portions are coaxially aligned and configured to allow flow of air or gas therethrough. The screen cover includes a shoulder portion defined between the first diametric portion and the second diametric portion. The screen cover further includes a mesh disposed at a first opening of the first diametric portion. The mesh prevents entry of external objects into the water heater through the open end of the conduit.

An environment control system includes: a second storage unit storing a fluid model inside a space; a second communication unit configured to obtain temperature information inside the space and an operation state of an air conditioner provided in the space; an estimation unit configured to estimate a three-dimensional environmental distribution inside the space, based on the fluid model stored in the second storage unit, the obtained fluid parameter information, and the obtained operation state; and a control unit configured to control the air conditioner, based on the estimated three-dimensional environmental distribution.

An environment control system includes: a second storage unit storing a fluid model inside a space; a second communication unit configured to obtain temperature information inside the space and an operation state of an air conditioner provided in the space; an estimation unit configured to estimate a three-dimensional environmental distribution inside the space, based on the fluid model stored in the second storage unit, the obtained fluid parameter information, and the obtained operation state; and a control unit configured to control the air conditioner, based on the estimated three-dimensional environmental distribution.

In a commercial building, an improved terminal unit achieves individual occupant thermal comfort with optimal cost and energy efficiency through the integration of at least two local thermal comfort components into a single terminal unit along with a communication network that may incorporate additional thermal components and also employs emerging optimization principles to meet individual preferences for the thermal environment in a workspace basis while reducing overall zone or building energy use and operating in accordance with any constraints on the energy grid(s) that serve the buildings. These multiple objectives are met in part through the multi-comfort factor individual workspace control and a robust communication network that to coordinate thermal conditioning with neighboring workspaces.

In a commercial building, an improved terminal unit achieves individual occupant thermal comfort with optimal cost and energy efficiency through the integration of at least two local thermal comfort components into a single terminal unit along with a communication network that may incorporate additional thermal components and also employs emerging optimization principles to meet individual preferences for the thermal environment in a workspace basis while reducing overall zone or building energy use and operating in accordance with any constraints on the energy grid(s) that serve the buildings. These multiple objectives are met in part through the multi-comfort factor individual workspace control and a robust communication network that to coordinate thermal conditioning with neighboring workspaces.