Abstract: An apparatus with an oscillating circuit, which is excitable by means of an alternating signal source. The oscillating circuit includes a non-linear circuit element. The apparatus is designed so that the non-linear circuit element is operable in a non-linear operating range and with a frequency above its limiting frequency.

Abstract: Apparatus (100) comprising a device (10) with a first electrically conducting electrode (11), a second electrically conducting electrode (12), said electrodes (11, 12) being spaced apart, a pyro-electric material (13) to which said electrodes (11, 12) are attached/applied, at least one heat-exchanging structure (14) being thermally coupled to said pyro-electric material (13), said apparatus (100) further comprising an electric oscillator circuitry (20), said device (10) being electrically connectable to the electric oscillator circuitry (20) so as to provide an oscillation of said pyro-electric material (13).

Abstract: The air to be supplied to a room is brought to a desired temperature and a desired humidity through the following process steps: making outside air flow as a first air stream through a first line (20) and making a first portion of exhaust air coming from the room flow as a second air stream through a second line (21), wherein moisture is exchanged between the first air stream and the second air stream by means of a device for exchanging humidity, condensing, by means of a dehumidifying and cooling device (19), moisture in the form of water from the first air stream and/or from the second air stream and/or inside the device for exchanging humidity, and making a second portion of the exhaust air flow as a third air stream through another line (32) comprising another dehumidifying and cooling device (33) and returning said second portion back to the room, wherein in the other dehumidifying and cooling device (33) moisture is condensed from the third air stream in the form of water.

Abstract: A device for dehumidifying an air stream includes at least one first module including at least one Peltier element and at least one second module including at least one Peltier element. The entirety of the first module forms a first zone for cooling the air stream. The entirety of the second module forms a second zone for dehumidifying the air stream. The entirety of the first and the second modules forms an air channel for the air stream. A water discharge channel is disposed below the entirety of the second module and receives water accumulating during the dehumidifying of the air stream in the second zone. At least one sensor for measuring a temperature and/or a moisture of the air stream provides at least one output signal. A control unit including at least one controller controls the Peltier elements based on the at least one output signal of the at least one sensor.