An air conditioning system configured to reduce humidity and temperature. The air conditioning system includes a closed loop desiccant system, and a closed loop cooling fluid system. The air conditioning system comprises a dehumidification system, a distillation system, and a refrigeration system. The dehumidification system reduces the temperature and humidity of the air. The distillation system separates the depleted liquid desiccant. The refrigeration system maintains liquid desiccant and cooling fluid at an inlet temperature. A flow of air is passed through the desiccant to reduce humidity. The flow of air is passed through a cooling fluid spray to reduce, temperature. The desiccant circulated to a heat collector for regeneration. The cooling fluid is recirculated to a heat collector for regeneration.

An HVAC system is described having components of a variable refrigerant flow (VRF) outdoor compressor unit connected to an indoor fan coil unit. The indoor fan coil unit supplies air to ducts that condition a plurality of zones. Each zone has a volume modulating air damper that can maintain a predetermined volume of air flowing through it. As the dampers for some zones vary between open and close positions, the air pressure in the ducts changes. The volume modulating dampers compensate for these pressure changes, ensuring that only the predetermine volume of air is passing into the zones. By regulating the volume of into each zone, the volume modulating air dampers can restrict the air volume through the fan coil causing the outdoor unit to reduce compressor speed, thereby saving energy.

An air conditioning apparatus includes an air vacuum pump that sucks in air from a prescribed space to place the space under negative pressure, a first hot and cool air tank that contains the sucked air, first valves that adjust the flow rate of air supplied to or discharged from the first hot and cool air tank, a second hot and cool air tank that contains the sucked air while an air flow from the air vacuum pump to the first hot and cool air tank is restricted, second valves that adjust the flow rate of air supplied to or discharged from the second hot and cool air tank, and a heating and cooling device that manages the temperature of at least one of the first and second hot and cool air tanks to which an air flow from the air vacuum pump is restricted.

A method to predict the lifespan of an air filter including providing pressure sensors in a device having an air filter and a fan to drive air through the air filter, one pressure sensor located on an intake side of the fan and one pressure sensor located on an outflow side of the fan, periodically calculating a static pressure drop across the fan, storing the static pressure drop daily; calculating an average pressure drop, calculating a cumulative particle loading on the filter, comparing the cumulative particle loading with a pre-determined maximum particle loading for the filter, and determining if the filter needs to be changed is provided.

A work facility that is capable of adjusting an air volume without a work defect and saving energy. The opening degree of an air volume adjusting damper corresponding to a filter booth for which the individual air volume measured by a corresponding individual flowmeter is the smallest among the respective individual air volumes for the filter booths is adjusted to a completely open state, whereas the opening degree of any other air volume adjusting damper is adjusted to such an opening degree that the individual air volume for the corresponding filter booth as measured by a corresponding individual flowmeter is equal to the smallest individual air volume, and a gas discharge fan is adjusted by a total air volume adjusting mechanism so that a total air volume measured by a total flowmeter is equal to a predetermined target total air volume.

An HVAC system includes a blower configured to provide a flow of air into a conditioned space. A temperature sensor measures a discharge air temperature of the flow of air provided to the conditioned space. The blower provides the flow of air at a predefined flow rate. The controller determines that the measured discharge air temperature satisfies predefined stability criteria associated with a change in the discharge air temperature during a first period of time being less than a threshold value. If the stability criteria are satisfied, a temperature offset is determined between the discharge air temperature and an indoor temperature. The temperature offset is stored in a memory and is associated with the flow rate of air provided by the blower and the outdoor temperature.

An energy management system is configured to calculate a percentage of satisfied based on the report data for each of the plurality of buildings; create, for each of the plurality of buildings, a plan for operating each of the air-conditioning facilities based on the percentage of satisfied and a predetermined target percentage of satisfied; calculate a first energy consumption amount based on the first piece of data; calculate a second energy consumption amount based on the second piece of data, the third piece of data, and the fourth piece of data, the second energy consumption amount being obtained when the each of the air-conditioning facilities is operated after a lapse of a predetermined time period; and control, when the first energy consumption amount is larger than the second energy consumption amount, the operation of the each of the air-conditioning facilities so as to achieve the second energy consumption amount.

An air-conditioner outdoor unit and a control method for a fan (100) of an air-conditioner outdoor unit; the air-conditioner outdoor unit of the present invention comprises a fan (100) and a deflector ring (200) that is sleeved on the outside of a vane (110) of the fan (100); further comprised are a vane stopping device (300), a wind speed measuring device (400), and a control system. The vane stopping device (300) is disposed on the deflector ring (200), is connected to the control system, and may cause a vane (110) that is passively rotating to stop rotating; the wind speed measuring device (400) is connected to the control system, and is used for detecting the wind speed flowing through the vane (110), the wind speed comprising a wind speed value and a wind speed direction; the control system controls the vane stopping device (300) to start and shut down according to the wind speed that is detected by the wind speed measuring device (400), and controls actual start-up frequency of the fan (100) according to the wind speed that is detected by the wind speed measuring device (400). The air-conditioner outdoor unit and the control method for the fan (100) of the air-conditioner outdoor unit may compensate the rotational speed of the fan (100), and ensure the start-up success rate of the fan (100).

The framework herein may be called outcome-based ventilation (OBV) for evaluating ventilation rates (VR) in commercial buildings and using a system to make informed control decisions based on the resultant indoor air quality (IAQ) and energy consumption outcomes. A ventilation control system includes a ventilation system that provides air circulation to a building and a controller that controls the ventilation system based on input that include a current ventilation rate. The system also includes an optimization system that drives the controller based on factors like building and pollution transport models, scientific estimates of ventilation impacts on productivity, sick leave, and health, user preference parameters, and weather, pollution, and price forecasts.

An HVAC system includes an indoor heat-exchange coil disposed between a supply air duct and a return air duct. A damper is disposed in a re-circulation duct and is moveable between an open position and a closed position. A controller is configured to determine if the HVAC system is operating in a heating mode or an air-conditioning mode. Responsive to a determination that the HVAC system is operating in the air-conditioning mode, the controller is configured to determine if the variable-speed indoor circulation fan is operating at a minimum speed and if the relative humidity measured by the humidity sensor is above a pre-determined threshold. Responsive to a determination that the variable-speed indoor circulation fan is operating at the minimum speed and the relative humidity of the enclosed space is above the pre-determined threshold, the controller signals the damper to move to the open position.