A method is disclosed 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 h 5 eat 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 received dry air from the dehumidifier and supply cooler dry air to the residence or building interior, or other target environment. A system is also disclosed for operating the described air supplying or air conditioning method.

A rotary heat exchanger through which a first fluid flowan outside air or inlet air flow, for exampleand a second fluid flowan exit air or outgoing air flow, for examplecan flow in a counterflow configuration, has a rotatably mounted rotor (5) that has a first flow sector for the first fluid flow and a second flow sector for the second fluid flow through which the rotor (5) passes during a rotation, a frame in which the rotor (5) is rotatably supported, and a sealing assembly (9) by means of which an inflow side of the first fluid flow and an outflow side of the second fluid flow can be separated from the outflow side of the first fluid flow and from an inflow side of the second fluid flow, respectively. In order to simplify the sealing assembly, with the aim being that a reliable seal between the inflow and outflow sides of the two fluid flows be automatically ensured during operation of the rotary heat exchanger, it is proposed that the sealing assembly (9) have a first seal (12) that bears sealingly against the side of a partition (10) directed upstream into the first fluid flow (2), and a second seal (13) that bears sealingly against the side of the same partition (10) directed upstream into the second fluid flow (3).

A rooftop HVAC unit includes a cabinet, an energy recovery wheel, dampers, and a controller. The energy recovery wheel is configured to be mounted within the cabinet. The energy recovery wheel is configured to transfer heat between an outdoor air stream and a return air stream when in an operational mode, and is further configured not to transfer heat between the outdoor air stream and the return air stream when in a bypass mode. The dampers can direct the outdoor air stream and return air stream through the rooftop HVAC unit, either through the energy recovery wheel or around the energy recovery wheel. The controller is configured to adjust the dampers based on a selection between the operational mode and bypass mode of the energy recovery wheel.

A heating, ventilation, and/or air conditioning (HVAC) unit includes an energy recovery wheel, a first exhaust fan configured to draw a first air flow across the energy recovery wheel and discharge the first air flow from the HVAC unit, a second exhaust fan configured to draw a second air flow across the energy recovery wheel and discharge the second air flow from the HVAC unit, and a controller configured to operate the first exhaust fan and the second exhaust fan in an economizer mode and configured to operate the first exhaust fan and suspend operation of the second exhaust fan in an energy recovery mode.

A micro-climate control system includes a thermoelectric system integrated with a fan assembly. The thermoelectric system is operable to actively cool or heat air as the air passes through the fan assembly. The thermoelectric system includes a thermoelectric heat pump, a heat reject subsystem, and a heat accept subsystem. The fan assembly is operable to draw air from a space to be conditioned and output conditioned air passed through one of the heat reject subsystem and the heat accept subsystem to the space to be conditioned and output air passed through the other away from the space to be conditioned. In this way, the micro-climate control system may provide localized comfort, while allowing a larger climate control system to maintain a more efficient temperature set point. In this way, the overall energy consumption may be reduced while providing the same level of effective comfort.

A data center cooling system includes an evaporative cooling system. The evaporative cooling system includes fans configured to circulate outside air at ambient conditions through an entry zone of a data center, and atomizers positioned upstream of the entry zone configured to spray atomized water into the circulating outside air. The atomized water evaporates in an evaporation zone and cools the outside air to produce cooled air, which is directed through racks of computers positioned downstream of the evaporation zone.

Systems and methods for controlling temperature in an enclosed space can include an air-to-air heat exchanger (AAHX) and a direct evaporative cooler (DEC). The DEC can be located in a scavenger or outdoor air stream such that the DEC cools the outdoor air, which is then used to cool or reject heat from a process air stream passing through the AAHX. In an example, the AAHX can be a sensible wheel. In another example, the AAHX can be a counter-flow flat plate. The system can operate in various modes, including an economizer mode and an evaporation mode, depending, in part, on the outdoor air conditions and a load on the system. In some examples, the system can include a DX coil to provide additional cooling to the process air in another operating mode.

An air mixing system for a heating, ventilation, and air conditioning (HVAC) system includes a conduit configured to receive a first airflow and a second airflow and to discharge the first airflow and the second airflow as a mixed airflow via an outlet of the conduit. The air mixing system also includes a thermal wheel disposed within the conduit. The thermal wheel is configured to direct the first airflow and the second airflow thereacross, rotate within the conduit, and transfer heat between the first airflow and the second airflow.

Ventilating units that include a recovery wheel, a supply air outlet from the wheel, an outdoor air supply fan that moves outdoor air through the recovery wheel, an economizer damper that opens to bring outdoor air directly into the supply air outlet, and an exhaust air discharge fan that moves exhaust air through the recovery wheel and to outdoors; HVAC units that include air conditioning with an air handler supply fan, a recovery wheel, an economizer section, an outdoor air supply fan, and controls; and methods of controlling airflow in an HVAC unit that include controlling an economizer damper based on outdoor and return air temperature and enthalpy or dew point. Some ventilating units connect to a packaged air handler and other ventilating units include the air handler, cooling coil, and air handler supply fan. Some embodiments include another damper that opens to bypass the recovery wheel for power exhaust.

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.