Technical area

[001] This invention relates to a method and an arrangement for drying a water damaged sandwiched floor structure including a concrete flooring, an air permeable isolating layer and a concrete subfloor, the method comprising providing an air inlet opening and an air outlet open ing through the flooring, and continuously in a closed loop flowing dry air through the isolating layer via the openings by a blower and a dehumidifier in serial connection.

Background

[002] A prior art method and arrangement of a similar kind is disclosed in DE 3632424 Al. Therein, the blower is used to force dehumidified air into the inlet opening, whereas the dehu midifier draws moist air from the outlet opening. This prior art is, however, not optimally useful in sandwiched floor structures that are relatively poorly permeable to airflow. The dehumidifi er, on the one hand, will then not be effectively capable of drawing the moist air from the out let opening without being overheated. Trying to increase the blower pressure in order to in crease the airflow through the isolating layer, on the other hand, will result in that heated air will escape from the floor structure with danger of spreading bacterial spores and bad smelling air to the adjoining structures and the room environment.

Disclosure of the invention

[003] An object of the invention is to obtain a quick an efficient drying process which will in crease the temperature in the floor structure only with substantially no process air escaping to adjoining structures and room environment.

[004] In an aspect of the invention the method is further comprised by the blower being a suc tion blower, drawing air from the outlet opening by the suction blower, and forcing air into the inlet opening by the dehumidifier.

[005] By this reversed serial arrangement, and by instead using a suction blower, as compared to the prior art, a very high suction force can be obtained in the isolating layer and practically no air in the process is capable of escaping to adjoining structures and room environment. The suction blower is also capable of heating the moist air, increasing the efficiency of the drying process. [006] An arrangement according to the invention has all features necessary for performing the method.

[007] The suction blower may be a side channel blower. A suitably dimensioned side channel blower has an inherent capability of producing a high suction force for drawing the moist air through the isolating layer.

[008] The suction blower and the dehumidifier may be contained in a common casing having a sound and heat insulation therein. The resulting combined drying apparatus will thereby be very energy efficient. The energy efficiency is achieved by the fact that a large amount of the heat is generated by the suction blower. That heat would otherwise be delivered to the envi ronment from the suction blower including its motor and suction and pressure conduits. In the common heat insulated casing the heat can be expediently delivered to be used by the dehu midifier. Heated air supplied into the sorption block of the dehumidifier increases the efficiency of the dehumidification.

[009] Other features and advantages of the invention may be apparent from the detailed de scription and the appended claims.

Brief description of the drawing

[010] FIG. 1 is a diagrammatic cutaway top plan view of a floor structure being dried according to the method of the invention;

[Oil] FIG. 2 is a view, partly in section, along line 2-2 in FIG. 1;

[012] FIG. 3 is a view, partly in section, of a drying apparatus that may be used in the inven tion;

[013] FIG. 4 is an oblique cutaway view of a drying apparatus that may be used in the inven tion; and

[014] FIG. 5 is a diagrammatic cutaway top plan view illustrating a pattern of openings in a corner area of a floor structure to be dried according to the invention.

[015] In the drawing, components having mutually similar functions may be designated by same reference numerals. Detailed description of embodiments

[016] The sandwiched water damaged floor structure 10 shown in the example of FIGS. 1 and 2 includes a concrete subfloor 20, intermediate cellular plastics isolating layer 18 and a con crete top layer 12.

[017] Before the drying operation takes place, a flooring (not shown) has been at least partial ly removed and a number of inlet and outlet openings 14 and 16, respectively, has been formed through the concrete top floor, for example by drilling/boring. While the openings 14, 16 not necessarily need to extend also through the isolating layer 18, this may be convenient and be the common case.

[018] Inlet tubings 56 and outlet tubings 66 are then sealingly connected, for example via re spective flanges 74 and 72, to the respective inlet and outlet openings 14 and 16. The inlet tub ings 56 are connected to an outlet 52 of a dehumidifier 50 and the outlet tubings 66 are con nected to an inlet 126 of a suction blower 60. Dehumidifier 50 and suction blower 60 are serial ly connected by a conduit 128 and may be arranged as separate units (not shown). In the em bodiments shown in the drawings they are, however, arranged in a common casing 102 as a single drying apparatus 100.

[019] The drying apparatus 100 according to the invention and shown in FIG. 3 is further pro vided with a sound and heat insulation inside the casing 102. The sound and heat insulation comprises a laminate having a thicker sound and heat insulating layer 104 and a thinner sound and heat reflecting layer or film 106. The laminate may be adhesively bonded to the interior face of the casing 102.

[020] Inside the sound and heat insulation 104, 106 in the housing 102, the dehumidifier 50 is mounted in parallel with and above the suction blower 60. Specifically, the dehumidifier 50 is suitably installed against one side of the casing 102, and the suction blower 60 is mounted in near heat-conducting contact directly against a bottom face of the dehumidifier 50.

[021] The suction blower 60 is a side channel blower comprising an electric motor 122 and a centrifugal blower housing 124. The suction blower 60 has a suction channel 126, arranged to be connected to the above-mentioned inlet air tubing 66, and an outlet channel 128 connected to an inlet 152 to the dehumidifier 50.

[022] The dehumidifier 50 is a sorption dehumidifier having an inlet 170 for ambient air 172. At the inlet 170 there is a fan, such as a duct fan 154, to further increase the mixed flow of the ambient air 172 and the process air flow 68 heated by the suction blower into the dehumidifier 50. Downstream of the fan 154, the resulting mixed process air is led into a sorption block 156 which may be of the rotary type. The sorption block 156 has an absorbent for accumulating moisture in the process air and is able to divide the output flow into the above-mentioned dry air flow 58 and a wet air flow 78 which is discharged from the dehumidifier 50 through an out let channel 162 from which it can be discharged through a wet air tubing 76. The dehumidifier 50 also has a regeneration chamber 158 where there is a self-regulating PTC (Positive Tempera ture Coefficient) element 160 to further heat up the air when needed. Without such a PTC ele ment, the dehumidification would be degraded by the overheating protection being released and the operation thereby deteriorating.

[023] In FIG. 4, a slightly modified drying apparatus 100 is further shown mounted on a trolley 108 to be easily moved over shorter distances.

[024] In the example of FIG. 1 the water damage may be located all over the floor structure 10, or more or less concentrated to the central portion of the floor structure 10. In that case the outlet openings 16 may be provided closer to the central portion than the inlet openings 14 as apparent from FIG. 1.

[025] In the diagrammatic example shown in FIG. 5 the water damage is located close to a corner of the floor structure. In that case an outlet opening 16 may be provided close to the corner, while for example three inlet openings 14 may be provided at a distance, surrounding the outlet opening 16. In general, the outlet opening(s) should be located close to the water damage, and there may be provided as many or more inlet openings than outlet openings in a floor structure.

[026] The foregoing detailed description is given primarily for clearness of understanding and no unnecessary limitations are to be understood therefrom. Modifications will become obvious to those skilled in the art upon reading this disclosure and may be made without departing from the scope of the appended claims.