TEMPERATURE CONTROL OF VENTILATION AIR

Abstract: The invention concerns a device where used ventilation air is used to bring fresh outside air to the desired temperature and next to convey to the to be ventilated space. For this purpose is made use of heat regenerators (6, 7) which serve with the help of a change-over valve (5, 15) intermittent for heating or cooling of the ventilation air. Characteristic is that the used air by means of heating or cooling by water atomisers (12) is brought to such a temperature that the heat regenerators (6, 7) after the passage of the used air attain the desired temperature. After a cycle change the fresh outside air is brought to the desired temperature by the heat regenerators (6, 7). A variant of the invention shows the atomisers (12) mounted to the valve (5, 15) where the atomisers (12) turn 180 DEG at the changing of the cycle.

Description: Tenperature control of ventilation air. The invention concerns a device where used ventilation air is used to bring fresh outside air to the desired temperature and then convey to the space to be ventilated. Heat regenerators are used for this purpose which in turn feature heating and cooling of the passing air. to control the temperature of the space to be ventilated the device is provided with the possibillity to cooling or heating of the flow of used ventilation air. Characteristic of the invention is the fact that the fresh outside air is only passing the heat regenerator and next transported into the space by a ventilator. The heat regenerators are heated by the used ventilation air to the correct temperature by heating or cooling the used ventilation air as is required. A device like this is known from the European patent EP-B-128188. The patent describes a system where heat regenerators take up the heat from the used air and supply that to the fresh air. The temperature in the building has to be controlled by a separate heating system. The Dutch patent application KL-A-5801084 mentions a like system where the fresh air can be cooled by atomised water wetting the regenerator slabs. This system has also no provisions to control the temperature by heating. Furthermore this system is a very "wet" system where easy grow of algae and mould is possible. It has been found that treatment of intake air with water or heating elements and filters will bring unwanted smells, vapours and bacteria into the ventilated space. The invention aims at preventing these drawbacks by having the incoming air only in contact with the heat regenerators and blown into the space to be ventilated by a ventilator. The temperature control is made possible by conditioning the used air so that this air brings the heat regenerators to the correct temperature. The used air is extra heated in the case that the space has to be warmed up and is cooled down when the space must be cooled. Cooling takes place by atomising water to a high degree while by turbulence the water is vapourised before this can wet the slabs of the heat regenerator. The invention will be described following the drawings. Fig. 1 shows a diagram of the installation. Fig. 2 shows a diagram of the change-over valve with atomisers. In fig. 1 is indicated with (1) the exhaust channel of the space. Vith (2) and (3) are connections to the outside air indicated. At (4) the fresh air enters the space. Vith (5) is a change-over valve which governs the intermittent airstreams through heat regenerators (6) and (7). (8) is a ventilator for the airstream to the space and (9) is a ventilator for the exhaust airstream out of the space. At (10) is a heating unit and at (11) a section with water atomisers (12) with water supply (13) and compressed air supply (14). Operation is as follws: The used air leaves through channel (1) via a (not drawn) filter and is sucked-in by ventilator (9), passes heating unit (10) and water atomising unit (11) and is conveyed by the change-over valve (5) via heat regenerator (6) to the outside air (2). In the same time will ventilator (8) transport outside air via opening (3) and heat regenerator (7) along change-over valve (5) to the space. Vhen the change-over valve (5) is placed in the position indicated by broken lines the airstreams in the heat regenerators (6) and (7) reverse thereby alternating take up or deliver heat. In case that the intake air after entering through the heat regenerator (7) is too low in temperature the heating unit (10) will be activated and raise the temperature of the used air. Heat regenerator (6) will take up more heat and after changing of the airstreams deliver fresh air of a higher temperature. In case that the space has to be cooled down the used air of channel (1) is cooled by vapourising very fine atomised water by atomisers (12). The used air lowers in temperature and heat regenerator (6) will deliver air of a lower temperature after changing. In this way it is possible to deliver fresh outside air at the desired temperature practically without forming condens in the heat regenerators (6, 7) and air ducts and have an operation possible that is clean and without smells. An advantageous construction of the change-over valve is shown in Fig. 2. In many cases the available space is limited. By mounting the atomisers (12) on the side of the valve body (15) instead of in channel (1), the atomisers are in a place with high turbulences which favour vapourising. Herewith it is necessary that the atomiser (12) turns 180 degrees when the change-over valve (15) revolves. Therefore the atomisers (12) are mounted on a shaft (16) which is parallel with the axis of valve body (15). The shaft is supported with supports (not shown) to the valve body (15), Revolving of the shaft (16) is executed by a combination of gear (17), toothed belt or chain (18) and gear (19). Gear (19) is fixed to the shaft (20). Shaft (20) is hold steady while the valve body (15) turns around shaft (20). The relation of the number of teeth of gears (17) and (19) determines the rotating angle (21) of the shaft (16) of the atomisers (12) in relation to the angle (22) of the valve body (15). The position of the atomisers (12) when the valve body (15) is rotated is indicated with a broken line.

Claims: Claias. 1] Temperature control of ventilating air with pairs of heatregenerators (6, 7) which are by means of a central change-over valve (5) alternating activated characterised in that the to be expelled used air is heated or cooled down as is required before this used air by means of a ventilator (9) is expelled via a heatregenerator (6, 7) to the outside air, while fresh outside air by means of ventilator (8) via a second heatregenerator (6, 7) is led direct to the to be ventilated space, where always one heatregenerator (6, 7) is brought upon the desired temperature by leading there-through the used air which is put to temperature, while the incoming fresh air is brought to the desired temperature by the other heatregenerator (6, 7). 2] Temperature control of ventilating air with pairs of heatregenerators (6, 7) which are by means of a central change-over valve <5) alternating activated as in claim 1 characterised in that the used air is conditioned by a unit which is provided with a filter, a ventilator (9), a heater (10) and a devise (11) with water atomisers (12). 33 Temperature control of ventilating air with pairs of heatregenerators (6, 7) which are by means of a central change-over valve (5) alternating activated as in claim 1 and 2 characterised in that the atomisers (12) for water are mounted on the change-over valve (15) where the atomisers (12) by means of a transmission (17, 18 and 19) turn around 180 degrees with a shaft (16) which is parallel to the shaft (20) of the change-over valve (15). 43 Temperature control of ventilating air with pairs of heatregenerators (6, 7) which are by means of a central change-over valve (5) alternating activated as in claim 1, 2 and 3 characterised in that the heatregenerators (6, 7) are of the type where a number of slabs made of heatabsorbent material are placed at short distance palallel to and in the airstream and that these function as well for cooling as for heating of the airstream.

Inventors: MIDDENDORF JOHANN GERHARD, MIDDENDORF, JOHANN, GERHARD
Applicants: MIDDENDORF JOHANN GERHARD, URSUS BV, MIDDENDORF, JOHANN, GERHARD, URSUS B.V.
Application year: 1995
Main classification: F24F12
IPC codes: F24F12