Several methods and systems for pre-cooling warm air in a cooling system are disclosed. The warm air may be return air, fresh air or a combination of return and fresh air. Condensate from a primary cooling element is applied to the wet side of an air-to-air heat exchanger while the warm air passes through the dry side of the heat exchanger. The warm air is pre-cooled by the transfer of heat from the warm air to the condensate, reducing overall energy consumption in the cooling system.

An apparatus is provided and arranged with an air control system to alternately direct a first and a second airflow to a first and a second energy-absorbing body in order to achieve a heat and moisture transfer between the two airflows. The energy exchange bodies alternate between recovery and release modes such that when one energy exchange body is in the release mode the other is in the recovery mode. Each of the first and second energy absorbing bodies is divided into a first latent energy recovery portion which includes a moisture absorbent material so that it is arranged to absorb latent energy and a second sensible energy recovery portion which is substantially free from moisture absorbent material so as to absorb primarily sensible energy. The second portion is arranged to supply heat to freezing air entering the energy absorbing body to prevent condensation and frosting damage to the first portion.

A ventilation unit for decentralised room ventilation systems, in which unit at least one reversible fan and a heat reservoir element are supplemented by an electrostatic precipitator for air purification. In addition, a filter assembly is provided for a ventilation system, in particular for a decentralised room ventilation system, having an air duct with an electrostatic precipitator through which an air stream to be purified is forced, with the precipitator extending over a predetermined section of the air duct. The filter assembly has, in the predetermined electrostatic-precipitator section of the air duct, at least one heat reservoir element impinged by the air stream, the electrostatic precipitator and the heat reservoir element thus being spatially restricted relative to one another.

The invention relates to a recessed hollow profile for mounting to a wall system in a wall of a building, which allows ventilation with efficient decentralised energy recovery. The invention also relates to a system for ventilating a room.

A ventilation unit with heat recovery, comprising a first block (2.1) having an air interconnection to the interior of the building, a third block (2.3) having an air interconnection to the exterior of the building and a second block (2.2) located between them, in which the heat recovery exchanger (14) is located, with at least one first channel (a) and at least one second channel (b). The second block (2.2) is insertable between the first block (2.1) and the third block (2.3) in such manner that the first channels (a) are airtightly connectable to one of the air ducts (21, 22) of the first block (2.1) and also to one of the air ducts (23, 24) of the third block (2.3). Also the second channels (b) are airtightly connectable to one of the air ducts (21, 22) of the first block (2.1), different from the air duct to which the first channels (a) are connectable, and the second channels (b) are also airtightly connectable to one of the air ducts (23, 24) of the third block (2.3), different from the air duct to which the first channels (a) are connectable.

A ventilation unit for an air-cooling tower and comprising a freewheel for drawing outside air and for discharging air in the upper portion of the ventilation unit. The freewheel has a rear face and a front face, the freewheel draws the outside air according to the direction of the axis of rotation of the freewheel by the front face and discharges the air radially to the axis of rotation of the freewheel, the ventilation unit being passed through by a drawing passage of outside air and by a discharge passage of air, the discharge passage of air directing the flow of air to the front of the plane formed by the front face. The subject matter also relates to an air-cooling tower and a method for drawing and for discharging air in such a ventilation unit.

A heat and humidity exchanger has example application in exchanging heat and water vapor between fresh air entering a building and air being vented from the building. The heat and humidity exchanger has a self-supporting core formed from layered sheets of a moisture-permeable material. Plenums are arranged to direct fluid streams into and out of the core. The plenums may be on opposing sides of the core to permit counterflow exchange of heat and water vapor.

A heat and humidity exchanger has example application in exchanging heat and water vapor between fresh air entering a building and air being vented from the building. The heat and humidity exchanger has a self-supporting core formed from layered sheets of a moisture-permeable material. Plenums are arranged to direct fluid streams into and out of the core. The plenums may be on opposing sides of the core to permit counterflow exchange of heat and water vapor.

A ventilation unit for decentralised room ventilation systems, in which unit at least one reversible fan and a heat reservoir element are supplemented by an electrostatic precipitator for air purification. In addition, a filter assembly is provided for a ventilation system, in particular for a decentralised room ventilation system, having an air duct with an electrostatic precipitator through which an air stream to be purified is forced, with the precipitator extending over a predetermined section of the air duct. The filter assembly has, in the predetermined electrostatic-precipitator section of the air duct, at least one heat reservoir element impinged by the air stream, the electrostatic precipitator and the heat reservoir element thus being spatially restricted relative to one another.

A cooling system includes a cooling device having a first cooling coil and a second cooling coil, a first heat transfer fluid in fluid communication with the first cooling coil, a second heat transfer fluid in fluid communication with the second cooling coil, a first heat exchanger in fluid communication with the first heat transfer fluid and the second heat transfer fluid, a second heat exchanger in fluid communication with the second heat transfer fluid and a source of external air, a system of fluid control devices in fluid communication with the second heat transfer fluid and configured to minimize a change in a total pressure drop of the second heat transfer fluid when the cooling system switches between operating modes, and a controller configured to selectively control the cooling device and the system of fluid control devices to operate the cooling system in each of the operating modes.