Device for heating of liquids

Abstract

A solar collector has a first plate for collecting solar energy, a second plate wherein there is an intermediate space between the two plates, and a quantity of liquid which is present between the plates for absorbing the energy collected by the first plate. The solar collector has a framework for fixing the plates at a mutual distance along the edges thereof so as to seal the space between the plates and to create space between the plates which comprises the liquid.

1 . Solar collector, comprising: 
 a first plate for collecting solar energy,    a second plate wherein there is an intermediate space between the two plates, and    a quantity of liquid which is present between the plates for absorbing the energy collected by the first plate.    
     
     
         2 . Solar collector as claimed in  claim 1 , which further comprises a framework for fixing the plates at a mutual distance along the edges thereof so as to seal the space between the plates and to create space between the plates which comprises the liquid, wherein the plates are substantially flat.  
     
     
         3 . Solar collector as claimed in  claim 1  or  2 , further comprising ribs placed between the first and the second plate in a manner such that, as seen from bottom to top, they substantially seal the space between the two plates.  
     
     
         4 . Solar collector as claimed in  claim 3 , wherein the ribs are arranged substantially parallel on two parts of the framework placed opposite one another in a manner such that the ribs form together with the framework a zigzag-shaped throughflow channel for the liquid between the first and the second plate.  
     
     
         5 . Solar collector as claimed in  claim 1 , wherein the first and the second plate are welded together along the edges with edge joints.  
     
     
         6 . Solar collector as claimed in  claim 1  or  5 , further provided with welded joints parallel to two parallel edges which extend from a side wall to a predetermined point situated at a distance from the opposite side as seen from the start of the welded joint.  
     
     
         7 . Solar collector as claimed in  claim 1 ,  5  or  6 , further provided with weld points in a predetermined pattern for holding the plates together.  
     
     
         8 . Solar collector as claimed in  claim 7 , wherein the plates move apart between the edge joints, welded joints and weld points.  
     
     
         9 . Solar collector as claimed in one or more of the foregoing claims, wherein the solar collector comprises inlet and outlet means to allow liquids to flow in and out.  
     
     
         10 . Solar collector as claimed in one or more of the foregoing claims, wherein the first plate is made from a non-transparent material with high heat-conducting properties.  
     
     
         11 . Solar collector as claimed in one or more of the foregoing claims, wherein the first plate on the solar energy-absorbing side is provided with means which improve the absorbing properties of the plate.  
     
     
         12 . Solar collector as claimed in one or more of the foregoing claims, wherein the means for improving the absorbing properties is a coating which comprises colouring agents.  
     
     
         13 . Solar collector as claimed in  claim 12 , wherein the coating also brigs about a low emission coefficient of the first plate so as to limit the emission of energy.  
     
     
         14 . Solar collector as claimed in one or more of the foregoing claims, wherein the plate material of the first plate is stainless steel.  
     
     
         15 . Solar collector as claimed in one or more of the foregoing claims, wherein a cover plate is mounted above the first plate so as to limit heat losses, for instance through convection.  
     
     
         16 . Solar collector as claimed in  claim 15 , wherein the cover plate is provided on the top side with means for limiting reflection.  
     
     
         17 . Solar collector as claimed in  claim 15  or  16 , wherein the cover plate is provided on the underside with means for preventing energy flows through this cover plate.  
     
     
         18 . Solar collector as claimed in one or more of the foregoing claims, wherein the solar collector and the cover plate are contained in a housing.  
     
     
         19 . Solar collector as claimed in one or more of the foregoing claims, wherein the second plate consists of material with a low coefficient of heat conduction.  
     
     
         20 . Solar collector as claimed in  claim 18 , wherein the housing is provided on the inside with insulating means for reducing heat flows on the sides and underside of the device.  
     
     
         21 . Solar collector as claimed in one or more of the foregoing claims, wherein during use it is disposed at the most perpendicular possible angle relative to the solar radiation.  
     
     
         22 . Solar collector as claimed in one or more of the foregoing claims, wherein it is disposed rotatably along one or more axes.  
     
     
         23 . Method for directing a solar collector of one or more of the foregoing claims so that it acquires the most perpendicular possible positioning relative to the solar radiation, comprising the following steps of: 
 determining the direction of the sun,    calculating the hereby desired position of the device,    displacing the device so that this position is assumed.    
     
     
         24 . Method for manufacturing a solar collector as claimed in one or more of the claims  5 - 8 , comprising the following steps of: 
 placing two plates of substantially equal size onto one another;    welding the two plates together along the edges;    welding the welded joints to form the throughflow channels;    welding the weld points.    
     
     
         25 . Method as claimed in  claim 24 , wherein the welding takes place with a laser welding process.