In a system for air-conditioning interior spaces of a building which are connected via at least one exhaust air duct, one or more interior spaces are provided with an air-conditioning unit which has a inlet line of outdoor air, which supplies inlet air or circulating air to the interior space or spaces, and which is connected to a fluid circuit of a heat pump. The exhaust air duct and a further fluid circuit of the heat pump are connected to an energy store installed outside the building, wherein the energy store is connected to a heat exchanger in a liquid reservoir for energy transfer and for energy storage, which is connected via the heat exchanger to another fluid circuit of the heat pump, the exhaust air being directed into the liquid reservoir via a heat exchanger.

A dedicated outdoor air system and method that is capable of operating over a broader spectrum of conditions. The HVAC system of the present invention utilizes a heating means positioned within the return air passageway in order to optimize the regeneration of the desiccant wheel and energy recovery device. By positioning a heating means upstream of the regeneration side of the desiccant wheel, the system is capable of providing supply air having low dew points to the enclosed space while still providing improved energy efficiency over conventional HVAC systems.

A heat pump cycle includes a compressor, a heat exchanger, a gas-liquid separator, and an outdoor heat exchanger. The heat pump cycle includes a main circuit connecting the compressor, the heat exchanger, the gas-liquid separator, and the outdoor heat exchanger such that refrigerant flows therethrough. The heat pump cycle includes an exhaust-heat recovery heat exchanger, and an exhaust-heat recovery circuit forming a flow path leading to the compressor not through the outdoor heat exchanger but through the exhaust-heat recovery heat exchanger. The heat pump cycle includes an expansion valve that is disposed upstream of the exhaust-heat recovery heat exchanger in the exhaust-heat recovery circuit and expands the refrigerant such that the refrigerant changes from liquid phase to gas phase in the exhaust-heat recovery heat exchanger.

Methods and systems 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 or direct-expansion refrigeration circuit, secondary circuit coils, and a dehumidification wheel. Various embodiments include modulating the secondary circuit compressor to adjust reheat capacity at the secondary circuit condenser coil, a geothermal direct-expansion refrigeration circuit, a variable refrigerant flow subsystem, fan coil units, multiple zones, a dedicated outdoor air supply subsystem, an evaporative cooler, supplemental outdoor air, or a combination thereof. In some 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.

A safety system (1) for evacuation of contaminated air and prevention of ignition in an air handling system (2). The air handling system (2) comprises a supply air unit (3) arranged in a supply air duct (4), and an exhaust air unit (5) arranged in an exhaust air duct (6). The safety system (1) further comprises a supply air contamination sensor (7) arranged in the supply air duct (4), an exhaust air contamination sensor (8) arranged in the exhaust air duct (6). The supply air contamination sensor (7) and the exhaust air contamination sensor (8) collect air contamination data (9). The air handling system (2) further comprises a control unit (10) for comparison of collected air contamination data (9) to a predefined air contamination data threshold value (11), and for controlling the supply air unit (3), and the exhaust air unit (5).

A heating, ventilation, and/or air conditioning (HVAC) system having a return air recycling system that includes a heat exchanger configured to be disposed along a refrigerant circuit of the HVAC system and flow a refrigerant therethrough, an exhaust fan configured to direct return air across the heat exchanger to place the refrigerant in thermal communication with the return air and to exhaust the return air from the HVAC system, and a controller configured to adjust a speed of the exhaust fan, a flow rate of refrigerant through the heat exchanger, or both, based on feedback indicative of a temperature of the return air.

An air-conditioner includes: a return-air inlet and a supply-air outlet each communicating with a predetermined space; a first main air channel configured to allow air to flow therein towards the supply-air outlet; a first heat exchanger disposed in the first main air channel and that causes heat-exchange between refrigerant flowing therein and air passing therethrough; an exhaust-air outlet communicating with an outside of the predetermined space; a second main air channel configured to allow air to flow therein towards the exhaust-air outlet; a second heat exchanger disposed in the second main air channel and that causes heat-exchange between refrigerant flowing therein and air passing therethrough; and an exhaust ventilation channel configured to allow air to flow therein from the return-air inlet towards the exhaust-air outlet.

An air conditioning system includes: an intake unit configured to take in return air of an indoor space from a ceiling of the indoor space; an outdoor air processing unit configured to supply outdoor air while exhausting the return air taken in via the intake unit to outdoors; an air conditioner configured to supply, as air-conditioning air, mixed air of the return air taken in via the intake unit and the outdoor air supplied by the outdoor air processing unit; and at least one radiation unit disposed in the indoor space in a manner to surround the intake unit, the radiation unit being configured to radiate heat of the air-conditioning air supplied by the air conditioner while discharging the air-conditioning air to the indoor space.

An air conditioning apparatus saves space, has a low cost and a high energy efficiency. In a former stage, total heat exchange is carried out in a total heat exchange rotor which performs heat exchange between the return air from the indoor space and outdoor air. A passive desiccant rotor, if provided, may eliminate a the need for a regenerative heat source in a latter stage. Latent heat exchange is performed in a heat pump circuit which exchanges heat between the outdoor air and the return air which have undergone total heat exchange. Further, the air conditioning apparatus may realize reduction of the total cost of equipment by eliminating the outdoor unit, and may realize reduction of on-site construction cost after the installation of the equipment and shortening of the construction term.

An air conditioning system includes: an intake unit configured to take in return air of an indoor space from a ceiling of the indoor space; an outdoor air processing unit configured to supply outdoor air while exhausting the return air taken in via the intake unit to outdoors; an air conditioner configured to supply, as air-conditioning air, mixed air of the return air taken in via the intake unit and the outdoor air supplied by the outdoor air processing unit; and at least one radiation unit disposed in the indoor space in a manner to surround the intake unit, the radiation unit being configured to radiate heat of the air-conditioning air supplied by the air conditioner while discharging the air-conditioning air to the indoor space.