A control system, comprising one or more smoke sensors, each configured to measure a level of smoke at a location within a building and to output a smoke level signal based at least in part upon the measured level of smoke. A controller configured to receive the smoke level signals and to control an operation of one or more energy recovery ventilation systems in a first mode of operation to recover energy when the smoke level signal is below a predetermined value and in a second mode of operation to evacuate smoke when the smoke level signal is above the predetermined value.

A heating, ventilation, and/or air conditioning (HVAC) system includes an enclosure that is divided by a partition extending between a first panel and a second panel of the enclosure such that the partition defines an outdoor air flow path and a return air flow path through the enclosure. The partition includes an opening extending between the outdoor airflow path and the return airflow path. The HVAC system also includes an energy recovery wheel that translatably extends through the opening and is positioned within the outdoor air flow path and the return air flow path. The energy recovery wheel is disposed within the enclosure at an oblique angle relative to the outdoor air flow path and the return air flow path.

A dehumidizer includes an upper air passage, a lower air passage, a rotary heat storage device, an evaporator, a condenser, a motor, and a fan. The upper air passage and the lower air passage are separated by a partition, and the right end of the upper air passage has an air inlet, and the right end of the lower air passage has an air outlet, and the left end of the upper air passage and the left end of the lower air passage are communicated with each other. The upper end of the rotary heat storage device is disposed in the upper air passage, and the lower end of the rotary heat storage device is disposed in the lower air passage, and the motor drives the rotary heat storage device to rotate. The evaporator, condenser and fan are installed sequentially from left to right into the lower air passage.

A method of manufacturing an energy recovery ventilator unit includes providing a cabinet having exterior walls and interior floors and walls that define an intake zone, a supply zone, a return zone, an exhaust zone and an enthalpy-exchange zone. The intake zone and the exhaust zone are both on one side of the enthalpy exchange zone. The supply zone and the return zone are both on an opposite side of the enthalpy exchange zone. The method further includes installing a first blower in the intake zone. The first blower pushes outside air into the intake zone and straight through the enthalpy exchange zone into the supply zone. The method also includes installing a second blower in the return zone. The second blower pushes return air into the return zone and straight through the enthalpy exchange zone into the exhaust zone.

A method is provided for supplying air conditioned air to a residence or building interior. The method entails positioning a heat and mass exchanger to discharge conditioned air into the residence or building interior. Further, a rotatable desiccant wheel dehumidifier in positioned in fluid communication with the heat and mass exchanger. Supply air is received and treated in the dehumidifier, thereby supplying dry air to the heat and mass exchanger and exhausting hot humid air. The heat and mass exchanger is positioned and configured to receive dry air from the dehumidifier and supply cooler dry air to the residence or building interior, or other target environment. A system is also provided for operating the air supplying or air conditioning method.

An air handler includes a housing with a heat exchanger core. The housing includes a faceplate, a roof panel, a base panel, a first side panel, and a second side panel. A first tunnel and a second tunnel are connected to the housing at the faceplate. A septum protrudes from the faceplate and connects the core at a front edge. The air handler further includes a first recirculation path and a second recirculation path inside the housing. The first and second recirculation paths are defined by the septum, the housing, and the core. The first and second recirculation paths are configured to direct a portion of airflow from the first tunnel to the second tunnel. The air handler further includes a first damper and a second damper disposed on the faceplate and configured to obstruct the first recirculation path and the second recirculation path respectively.

An air-conditioning apparatus includes a housing having an outside air port, an air supply port, a return air port, and an exhaust port. The air-conditioning apparatus also includes: an outside air passage to make the outside air port and the air supply port communicate with each other; an exhaust air passage formed in the housing in a separated manner from the outside air passage to make the return air port and the exhaust port communicate with each other; an indoor heat exchanger disposed in the outside air passage; the air-sending device disposed in the outside air passage, and configured to generate an air flow directed toward the room from the outside air port via the air supply port and the air supply duct during operation; and an air supply damper being open during the operation of the air-sending device and being closed during a stop of the air-sending device.

Systems and methods for controlling temperature and humidity within a space in a building. Outdoor air and return air from the space are passed through particular equipment in a particular order. Equipment includes a secondary direct-expansion refrigeration circuit, a recovery wheel, a primary cooling coil, secondary circuit evaporator and condenser coils, and a dehumidification wheel. Various embodiments include multiple zones, chilled beams, and a dedicated outdoor air supply (DOAS) subsystem delivering dehumidified air to active chilled beams. In various embodiments, supply air passes first through the recovery wheel, then through the primary cooling coil, then through the dehumidification wheel, and then to the space. Further, in some embodiments, exhaust air passes through the dehumidification wheel and then through the recovery wheel. Pump modules may supply chilled beams and control their temperature to avoid condensation. A chiller may supply cooling water to both the primary cooling coil and the pump modules.

A heating ventilation and cooling system includes an energy recovery ventilator (ERV). The ERV is configured to produce an inlet airstream and an exhaust airstream. An enthalpy wheel within the energy recovery ventilator is operable to transport heat between the inlet and exhaust airstreams. A pressure transducer is configured to determine a backpressure across the enthalpy wheel. A controller is configured to determine, in response to the backpressure, an operational characteristic of the enthalpy wheel.

Systems and methods for controlling conditions in an enclosed space can include an integral make-up air system that can be arranged in the interior of the housing for an air conditioning system that uses scavenger air in an air-to-air heat exchanger (AAHX) to condition process air from an enclosed space. The make-up air system can take replenishment air from outside the air conditioning system and deliver it into the process air stream. The make-up air system can include at least one heating or cooling device to condition the replenishment air before the replenishment air mixes with the process air. In an example, the make-up air system can include a DX coil to selectively cool and dehumidify the replenishment air. The make-up air system can include a humidifier arranged in the flow path of process air between the process air inlet and the AAHX to selectively add humidity to the process air.