Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Patent
1989-12-20
1992-02-18
Rivell, John
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
165165, F28F 308
Patent
active
050885529
DESCRIPTION:
BRIEF SUMMARY
The object of the present invention is a method of constructing a heat exchanger, in which method essentially similar corrugated thermal transmission plates are piled to cover each other and the spaces between the plates are from their edges connected with inlet and outlet conduits for the mediums participating in thermal transmission, so that through every second space between the plates is passed a flow of heat giving medium and through every second space between the plates is passed a flow of heat receiving medium.
When there is a need to exchange heat between two flowing mediums plate type heat exchangers with plates piled one over another have been shown to be extremely effective. This type of heat exchangers are for example used in district heating systems where the heat transporting medium is water. In these heat exchangers using water can with a moderate pressure loss be achieved a thermal transmission coefficient in the range of about 2500-3500 W/m K.
The type of plate heat exchangers is known in which the plates lying on top of each other are square corrugated plates where the corrugations and the grooves between the corrugations have the direction of two opposite edges of the square. In this construction the plates are piled one over another so that the grooves in plates lying on top of each other are at an angle of 90.degree. each other.
When constructing heat exchangers it is essential to choose the pressure losses of flowing mediums and their thermal transmission coefficient in view of achieving the wanted optimal thermal exchange. These parameters can be regulated by selection of the distance between individual thermal transmission plates, the surface area of the plates and corrugation of the plates. However, it happens in the known heat exchangers that as the dimensions of an individual plate have been resolved, at the same time the thermal transmission parameters at a selected level of the flow have been settled so that they cannot be changed any longer. In case there was a desire to change the thermal transmission characteristics of the heat exchanger it was necessary to select new dimensions for the plates according to the new demands. Thus for every different heat exchanger there was needed a specific deep drawing tool for the manufacture of the thermal transmission plates. As these tools are very expensive this thing has limited the possibilities of variations in heat exchanger manufacture.
The purpose of the present invention is to solve the above problem in heat exchanger manufacture. Characteristic for the method of constructing a heat exchanger according to the invention is that the thermal transmission plates are piled one over another so that grooves in different plates will become into a selected angle with each another, said angle defining the pressure losses of the flowing mediums as well as the thermal transmission coefficient for which purpose the method uses essentially circular thermal transmission plates, or regular polygonal thermal transmission plates in which the direction of the grooves is such that the grooves in plates piled on top of each other may cross selectively at least in two different angles with respect to each other.
The essential point in the present invention is that a suitable design of the thermal transmission plates enables piling of them on top of each other so that the grooves in different plates can become into two or more different angles to each other. This means that from identical plates made with one and the same tool different heat exchangers can be manufactured to which different angles between the grooves give different thermal transmission characteristics. The possibilities of variation in heat exchanger manufacture are thus very much improved without any notable increase in manufacturing costs.
In the present invention the most suitable are circular thermal transmission plates, which make it possible to choose the angle between the grooves in different plates from a continuous range of 0.degree.-90.degree.. However the basic idea of the i
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Leo L. R.
Racert Oy
Rivell John
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