An air purification system including a housing defining a lumen, an inlet, an outlet, and a flow pathway between the inlet and the outlet and through the lumen; a filter assembly retained within the lumen and including a substrate defining an open three-dimensional volume, a photocatalytic material disposed on the substrate, and a photon source arranged to illuminate the photocatalytic material with optical radiation; and a flow control mechanism arranged along the flow pathway between the inlet and the outlet.

A ventilator (1) includes: an air supply fan (2) to supply outdoor air to a room; an air exhaust fan (3) to exhaust indoor air, out of the room; and a total heat exchanger (4) which is made with partition boards (41) being moisture-permeable flat parts and with spacer boards (42) being corrugated parts, the partition boards and the spacer boards being alternately stacked, the total heat exchanger exchanging heat between the outdoor air and the indoor air; and thereby suppresses ice formation. The ventilator (1) includes: an indoor temperature sensor (7); an indoor humidity sensor (8); an outdoor temperature sensor (6); and a control unit (5) to control operation of the air supply fan (2) and the air exhaust fan (3) on a basis of at least one state quantity estimated by substituting the indoor air temperature, the indoor air humidity, and the outdoor air temperature in a total heat exchanger model formula (51a) representing characteristics of the total heat exchanger (4).

A system and method is provided for controlling building fluid distribution. The system may cause a variable air volume building ventilation system to operate at different combinations of different fan speeds for different damper opening configurations. For each different combination of fan speed and damper opening configuration, the system may: determine a static pressure measurement for each terminal unit based on a flow measurement determined by terminal box controllers using a pressure sensor; and determine a static pressure measurement for the supply fan from a pressure sensor mounted in a ventilation duct downstream of the at least one supply fan and upstream of each terminal unit. The system may also determine and store in each terminal box controller, a friction loss coefficient based on the static pressure measurements for the supply fan and the terminal units.

An actuator may include a drive motor, an actuatable output, and a sensor for sensing a first sensed parameter in or around the actuator. The first sensed parameter may have a first sensed parameter value that can change with time. The actuator may also include electronics that may identify a first identified value representative of the first sensed parameter value and increment a first counter value when the first identified value falls within a first range of values, and increment a second counter value when the first identified value falls within a second range of values.

An air purification system including a housing defining a lumen, an inlet, an outlet, and a flow pathway between the inlet and the outlet and through the lumen; a filter assembly retained within the lumen and including a substrate defining an open three-dimensional volume, a photocatalytic material disposed on the substrate, and a photon source arranged to illuminate the photocatalytic material with optical radiation; and a flow control mechanism arranged along the flow pathway between the inlet and the outlet.

A method for providing personalized comfort to occupants of an environmentally conditioned space includes sensing a pre-adjustment pressure within a variable air volume diffuser, remotely adjusting a position an individually-adjustable directional outlet of the variable air volume diffuser, sensing a post-adjustment pressure within the variable air volume diffuser, and modifying the airflow through the variable air volume diffuser such that the post-adjustment pressure is equal to the pre-adjustment pressure. The variable air volume diffuser includes individually-adjustable directional outlets and a controller configured to regulate air pressure within the variable air volume diffuser when an individually adjustable directional outlet is adjusted. A user device in operative communication with the variable air volume diffuser includes a user interface to remotely adjust an adjustable directional outlet of the variable air volume diffuser to provide personalized comfort for the user. In embodiments, the variable air volume diffuser responds to spoken commands.

Disclosed are an air conditioning system and its pressure ratio control method and device. The method includes acquiring an actual pressure ratio of the compressor every preset time period in operation of the air conditioning system; judging whether the actual pressure ratio is greater than or equal to the first pressure ratio corresponding to a current level; controlling the compressor to downshift one level for operation if the actual pressure ratio is greater than or equal to the first pressure ratio corresponding to the current level; further judging whether the actual pressure ratio is less than the second pressure ratio corresponding to the current level if the actual pressure ratio is less than the first pressure ratio corresponding to the current level; and controlling the compressor to upshift one level for operation if the actual pressure ratio is less than the second pressure ratio corresponding to the current level.

An air conditioner includes: a cooling unit having a compressor operated at a variable operating frequency to adjust a revolving speed thereof, a condenser, an expansion valve and a cooling coil; and a heating unit for causing the heating medium flowing from the compressor toward the condenser to diverge, and to return to flow into the condenser, through a heating coil and a thermal dose adjusting valve disposed on the downstream side thereof; so as to control a temperature of air by the cooling and heating coils. When an opening manipulated variable of the thermal dose adjusting valve exceeds a first threshold value over a period of time, an operating frequency of the compressor is decreased, and when the opening manipulated variable of the thermal dose adjusting valve falls below a smaller, second threshold value, over the said period of time, the operating frequency of the compressor is increased.

A heat-activated fluid pump heats and cools a building. For cooling, an evaporator, coupled to a solar heater or comprising multi-pane windows with solar radiation-absorbent areas thermally coupled to a fluid cavity, converts a working fluid into a vapor. A pressure control valve allows vaporized working fluid into a liquid-piston chamber whenever a target pressure in the evaporator is exceeded. The working fluid expands, displacing liquid from the liquid-piston chamber in a pump stage where it enters a condenser situated in a vertical hole or covered horizontal trench in the ground. Ground-temperature pumped fluid returning to the liquid-piston chamber in a suction stage passes along the way through coils in rooms of the building. Check valves allow replenishment of the evaporator with return working fluid and direct flow of pumped fluid into and out of the liquid-piston chamber. For heating, the evaporator is in the ground.

A ventilation control device (2) includes a total exhaust air volume reader (16), an exhaust device specification reader (17), an exhaust air volume distributor (18), and an exhaust air volume instructor (19). The total exhaust air volume reader (16) reads the total exhaust air volume set to a building. The exhaust device specification reader (17) reads a maximum exhaust air volume of each of exhaust devices (3) as a specification of the exhaust device (3). The exhaust air volume distributor (18) sets the exhaust air volume of each exhaust device (3) by distributing the exhaust air volume read by the total exhaust air volume reader (16) according to the maximum exhaust air volume of the exhaust device (3) read by the exhaust device specification reader (17). The exhaust air volume instructor (19) instructs, to each exhaust device (3), the exhaust air volume set by the exhaust air volume distributor (18).