A ventilation system includes: a housing including a first inlet drawing outdoor into the housing, a second inlet drawing room air into the housing, a first outlet discharging outdoor air into an indoor space, and a second outlet discharging room air to an outdoor space; a total heat exchanger exchanging heat between the outdoor air and the room air; a first heat exchanger between the first inlet and the total heat exchanger; a second heat exchanger between the first inlet and the first heat exchanger; a compressor supplying a refrigerant to the first heat exchanger and the second heat exchanger; a four-way valve switching a flow direction of the refrigerant; a first expansion device at an inlet of the first heat exchanger expanding the refrigerant; a second expansion device between the first heat exchanger and the second heat exchanger and expanding the refrigerant; and at least one processor.

Implementations described and claimed herein provide systems and methods for evaporative cooling control. In one implementation, a humidity setpoint is received for a designated space, and at least one atmospheric condition of ambient air is received. The at least one atmospheric condition is measured using one or more ambient air sensors. A performance prediction of an evaporative cooler is generated by calculating a set of one or more predicted psychrometric properties of supply air leaving the evaporative cooler based on the at least one atmospheric condition. The humidity setpoint is compared to the set of one or more predicted psychrometric properties of the performance prediction in a setpoint comparison. A flow of fluid is controlled over evaporative media using one or more pumps of the evaporative cooler. The flow of the fluid is controlled based on the setpoint comparison such that the humidity setpoint is prevented from being exceeded.

In some aspects, a method for scheduling a heating, ventilation and air-conditioning (HVAC) system is provided. The HVAC system includes an air conditioning plant, at least one air handling unit (AHU) in connection with the air conditioning plant, and the at least one AHU is configured to serve a plurality of zones. The method includes: obtaining zone environmental information including a zone temperature, a zone air quality indicator and zone set-points for the plurality of zones that include zone temperature set-points and zone air quality set-points. The method also includes obtaining conditioned air temperature and conditioned air quality indicator and fresh air temperature of fresh air configured to mix with return air of the conditioned air to form pre-conditioned air and determining a minimum conditioned air conditioned air supply rate and a return air ratio based on a conditioned air function of parameters including the obtained information.

An air conditioning controller includes a control level setting unit to set an energy saving control level of an air conditioner based on an amount of change in inlet temperature of the air conditioner for a certain period of time immediately after stop of the air conditioner, and an energy saving control unit to perform energy saving control of the air conditioner based on the energy saving control level.

An environment control system is an environment control system that controls an environment of a target space. The environment control system includes: an obtainer that obtains biological information of a person present in the target space and environmental information of the target space; an estimator that estimates, based on the biological information and the environmental information obtained by the obtainer, a position of the person in the target space and a condition level indicating a level of comfort felt by the person in regard to the environment; a generator that generates, based on the position and the condition level of the person estimated by the estimator, a control signal that controls an operation of a device provided in the target space; and an outputter that outputs the control signal generated by the generator to the device.

A system for controlling heating, ventilation, and air conditioning (HVAC) systems includes a camera that captures images including temperature data for the space. An image analysis module is configured to receive the images and analyze the images to determine a current temperature in the space. A computer is configured to determine a future temperature in the space and determine an amount of heating or cooling output needed to maintain a predetermined temperature in the space. A controller is configured to communicate with a heating, ventilation, and air conditioning (HVAC) system. The HVAC system is configured to control the temperature in the space by heating or cooling the space. The controller is configured to transmit the determined amount of heating or cooling output needed to maintain the predetermined temperature in the space to the HVAC system to maintain the predetermined temperature in the space.

An air purifier and methods to sterilize an internal surface of an air purifier. The air purifier includes a removable particulate or gas filter, an air flow generator, a controller for said air flow generator, a first air flow setting with an air filtration air flow speed, and a second air flow setting which correlates with sterilization of an internal surface of the air purifier and/or removable particulate or gas filter. The air flow speed measured at the removable filter at the second air flow setting is from 0.1 to 1.2 cms.sup.1.

A system, method and apparatus for augmenting a building control system domain. A sensor network platform can be configured to collect data based on measurements from sensors outside of a legacy building control system domain, and to present information based on the collected data to a known interface supported by the legacy building control system. In one embodiment, the collected data can undergo customized processing by an operation center outside of the legacy building control system domain.

An air conditioner is provided. The air conditioner includes a housing with separate channels, a heat exchanger, two fans, a driver, and a controller. The heat exchanger exchanges heat with air in one channel, while the two fans expel air from separate channels. The driver operates the fans, and the controller regulates their operation based on indoor and outdoor temperatures, selectively activating a second fan of the two fans according to preset temperature conditions.

An air supply system moderates excess energy consumption occurring in fans. A second unit includes a second fan that supplies first air to a target space. A duct sends the first air sent from a first unit by a first fan to the second unit. A remote sensor acting as a first detector detects information about second air in the target space. A main controller acting as a first controller communicates with the second unit and the remote sensor. The second unit includes a second detector that detects the air flow volume sent by the second fan, and a sub-controller acting as a second controller that controls the rotation speed of the second fan. The main controller determines a target air flow volume of the second unit on the basis of the information about the second air acquired from the remote sensor, and transmits an instruction indicating the target air flow volume to the sub-controller. The sub-controller controls the rotation speed of the second fan such that the air flow volume detected by the second detector approaches the target air flow volume.