An arrangement (1) for air management of a room (100) comprises ventilating means (10) for enabling exchange of air between the inside environment (102) of the room (100) and the outside environment (103) of the room (100); a stand-alone air purifier (20), which is arranged separately from the ventilating means (10), and which is adapted to remove pollutants from the air in the inside environment (102) of the room (100); and a control system (30, 31, 32), which is in communication with both the ventilating means (10) and the air purifier (20), and which is adapted to control operation of the ventilating means (10) and the air purifier (20) in dependence of air quality data relating to the inside environment (102) of the room and the outside environment (103) of the room, the control system (30,31,32) being configured to control the ventilating means (10) and the air purifier (20) differently depending on whether the air quality data relating to the outside environment of the room (100) is above or below a predetermined reference. Operation of the arrangement (1) is aimed at optimizing indoor air quality and minimizing energy consumption.

An HVAC system for a multi-unit building having a riser stack in flow communication with a single unit HVAC system. The single unit HVAC system has a first heat exchanger thermally connected to the riser stack, a second heat exchanger thermally connected to a fluid distribution system within the unit, and a closed loop fluid flow path extending between the first and second heat exchangers. The first heat exchanger exchanges heat between a riser stack fluid in the riser stack and the closed loop fluid in the closed loop fluid flow path and the second heat exchanger exchanges heat between the closed loop fluid and a distribution fluid of the fluid distribution system.

An air filtering shelter 100 comprising a shelter frame 110 comprising a plurality of frame members 112 defining a sheltered area 102. Filter media 120 extends across the plurality of frame members 112, where the filter media 120 is disposed over the sheltered area 102. An airflow guide 130 extends across the plurality of frame members 112 between the sheltered area 102 and the filter media 120. The airflow guide 130 is impermeable and the filter media 120 and the airflow guide 130 define an airflow channel 125 between them. An airflow generator 140-1 is coupled to the shelter frame 110. The airflow generator 140-1 has an inlet 142 in the airflow channel 125 and an outlet 144 in the sheltered area 102.

An apparatus and method for measuring or controlling the Outdoor Air Fraction (OAF) ratio through economizer or outdoor air dampers and cabinet to total system airflow and mixed-air humidity ratio and wetbulb temperature for HVAC equipment. An OAF exceeding the minimum regulatory requirements wastes energy and contributes to global warming. OAF is used to optimize economizer damper position either manually or automatically using an economizer Fault Detection Diagnostic controller and actuator to meet minimum outdoor airflow requirements. After the outdoor air damper position is optimized, the mixed-air humidity ratio and mixed-air wetbulb temperature are determined and used with the measured mixed-air drybulb and supply-air drybulb temperatures to evaluate evaporator airflow, cooling capacity, and heating capacity, and, if necessary, provide a visual or electronically-transmitted error code signal indicating maintenance requirements to check or correct economizer damper position, cabinet leakage, airflow, cooling or heating capacity, and/or other faults for the HVAC system.

A system and method for minimizing indoor infection risk and improving indoor air quality (IAQ) while maximizing energy savings. The system integrates occupancy detection and forecasting, outdoor weather conditions and forecasting, indoor infection risks and air quality modeling, any tunable air filtration, the clean air delivery rate, and any portable air cleaners. The system outputs the total amount of outdoor air intake, the air temperature of the supply air into the space, the supply air flow rate into the space, the operation mode of tunable air filtration/purification/disinfection, the operation mode of the in-room air cleaner, and space/room temperature set-points, and thus can serve as the central controller for an HVAC system.

The disclosure relates to libraries used in conjunction with integrated ventilation and temperature controls for enclosed structures. Specifically, the disclosure is directed to libraries, systems and methods for minimizing pollution while simultaneously conserving energy and maintaining required levels of fresh air inside a multi-storied structure and its internal spaces, in an optimal manner, utilizing dynamic, user-defined threshold values and implementing strategies based on user defined goals.

An air handling unit, particularly for data center cooling, operates to cool a flow of return air from a conditioned space using a flow of ambient air. The return air is recirculated to the conditioned space as supply air. The flow of ambient air can be adiabatically cooled to a lower temperature to provide additional cooling. A flow of makeup air can be joined with the cooled return air to form the supply air, and can be sourced from the ambient environment directly or from the heated flow of ambient air.

When a humidity condition, including a humidity detected by a temperature and humidity sensor and a humidification load sensing unit falling below a threshold value, is met, an outside air conditioner supplies the heated and humidified air into the room. When the humidity condition is met during the indoor heating operation, the indoor heating operation is stopped or weakened. When the humidity condition is met, only the outside air conditioner is subjected to a heating and humidifying operation. Since the indoor air is not heated by the inside air conditioner more than necessary, when a heating load is low and a humidification load is present, a “conflicting state” can be prevented in which the inside air conditioner is subjected to a cooling and dehumidifying operation and the outside air conditioner is subjected to the heating and humidifying operation.

A facility providing systems and methods for demand control ventilation for a building, or a portion/portions thereof, using a combination of scheduling and environment sensors for fallback is disclosed. The facility for demand control ventilation modulates the volume exchange of outside air into an enclosed space (i.e., air that is external to the enclosed space) by mechanical air conditioning equipment or ventilation system, such as a fan, a Heating, Ventilation, and Air Conditioning (HVAC) system, and so on. Demand control ventilation is used not only to ensure that people within buildings have an allotted amount of fresh air but also to provide a cost savings to users, as a lower amount of airflow can reduce energy use and, therefore, energy costs.

A Fluid Flow Control System (FFCS) door assembly includes a continuous belt and a plurality of rollers. The plurality of rollers support the continuous belt and define a first segment, a second segment, a third segment, and a fourth segment. The continuous belt includes a plurality of openings that selectively allow fluid flow to pass through the first segment, the second segment, the third segment, and the fourth segment when two openings of the plurality of openings align with the first segment, the second segment, the third segment, or the fourth segment.