A cooling system incorporates a return air duct, phase change module, first exhaust duct, second exhaust duct, HVAC module and duct extending from the phase change module to the HVAC module. In a retrofit version, an existing building return of a conventional HVAC system is re-routed to the phase change system and the output of the phase change system is connected to the return side of the existing HVAC system. Standalone cooling systems are also disclosed. In either version, the phase change module receives return air via the return duct and external ambient air via one or more inlets. Mixed return air and external ambient air are forced by a blower/fan to the evaporative cooler, rotating housing containing phase change material, dehumidifier and a subject area to be cooled.

Rather than complex modeling or time consuming repetitive measuring for optimizing an HVAC system, a slope or change in energy use as a function of a change in a variable (e.g., temperature or humidity) is used to adjust the variable. In an HVAC system, the temperature or humidity of supplied air from the AHU is set based on the derived slope. The energy usage to heat and/or cool supplied air at the terminal units is balanced with the energy usage to heat and/or cool the air to be supplied by the AHU. The slope of the total energy usage may be indicated by a sum of flow rates.

Systems and methods of automatic synchronization of point read frequency are provided. The system can include data sources that receive data point values at respective deposit frequencies and a building enterprise managing device that performs an automatic synchronization process. The building enterprise managing device can receive a user configuration setting indicating a read frequency and obtain the data point values from a data source at the read frequency. The building enterprise managing device can identify a deposit frequency at which the data point values are received at the data source. The building enterprise managing device can determine whether the read frequency matches the deposit frequency. The building enterprise managing device can adjust the read frequency to match the deposit frequency in response to determining that the read frequency does not match the identified deposit frequency and obtain the data point values from the data source at the adjusted read frequency.

An air terminal for a heating or air conditioning system including a housing, a fresh air inlet in the housing to supply a fresh airflow to the air terminal, an outlet diffuser at the housing to allow airflow from the air terminal into a conditioned space, an inlet diffuser located at the housing to allow return airflow from the conditioned space into the air terminal, a coil located in the housing to condition the fresh airflow and/or the return airflow prior to the fresh airflow and/or the return airflow flowing into the conditioned space. A fan is located in the housing to urge return airflow through the inlet diffuser and across the coil. The fan and the inlet diffuser are located at a first side of the coil and the outlet diffuser and the fresh air inlet are located at a second side of the coil opposite the first side.

The present invention relates to controlling the treatment of air for the inside of a building and especially to controlling a hybrid air conditioning system for the regulation of the air temperature and humidity which utilizes outside air to enhance the efficiency of the system and which has a smoke evacuation system to enhance the safety of firemen and occupants when there is a fire or smoke hazard in the building.

An air conditioning system includes a first unit and a second unit. The space above the ceiling of each of a plurality of clean rooms is included in the chamber as a single space common to a plurality of the clean rooms. The first clean room is higher than the second clean room in air cleanliness.

Methods for providing heating or cooling to a plurality of zones in a conditioned space, include adjusting a temperature of a primary airflow using a heating, ventilation, air conditioning, and refrigeration (HVACR) system including a heat pump circuit and distributing the primary airflow to a plurality of terminals in the zones. The methods further include directing heat from the heat pump circuit to at least one of the plurality of terminals and heating air at the at least one of the plurality of terminals using the heat directed from the heat pump circuit. The methods can further include utilizing sources and sinks of the heat pump circuit to efficiently provide the heating or cooling. Systems include the heat pump circuit, terminals, heat distribution, and can include a controller to operate those components.

An air-conditioning control apparatus controls an air-conditioning unit used in a central air-conditioning system that conditions a plurality of rooms in a house by a single air-conditioning unit. In the apparatus, a microcomputer starts an output of an ON command signal when started, subsequently continues the output of the ON command signal when a detected temperature inside a room is lower than a predetermined determination temperature, and stop the output of the ON command signal when the detected temperature is equal to or higher than the predetermined determination temperature. A protective opening and closing unit closes a first power supply path between a voltage input terminal and an internal alternating-current power supply line when the ON command signal outputted from the microcomputer is supplied, and opens the first power supply path when the supply of the ON command signal is stopped.

Method and air treatment device (1) for control of supply air flow (L1). The air treatment device (1) comprises a chilled beam (2) with a pressure box (5) comprising an inlet (6) for inflow of supply air flow (L1) and a plurality of outlets (7) for outflow of the supply air flow (L1) out of the pressure box (5). The air treatment device (1) comprises an actuator (12) for control of supply air flow (L1), and the pressure box (5) comprises at least one pressure measuring socket (13) for control of static pressure (ps). The air treatment device (1) registers the static pressure (ps) and the position of the actuator (12), and calculates the real supply air flow (L1). The actuator (12) is arranged to change the configuration of the outlets (7) by a linear motion of a cover member (9) and change the open area of the outlets (7).

A three-pipe, multi-split system and a control method thereof. The three-pipe multi-split system includes an outdoor unit, a multi-split indoor unit, and a hydraulic module. By optimizing a refrigerant system, the phenomenon that a refrigerant is throttled before flowing through a refrigerant heat dissipation module or supercooled when passing through a plate heat exchanger which causes a relatively low temperature of the refrigerant entering the refrigerant heat dissipation module and consequent condensation on the refrigerant heat dissipation module to produce condensate water and then causes a damage to a compressor frequency conversion module can be avoided. In addition, more refrigerant is caused to flow through the refrigerant heat dissipation module to reduce the temperature of the module.