This invention relates to a mufti block heat exchanger.
The mufti block heat exchanger proposed herein has been designed for maximum thermal contact between the two streams. This heat exchanger has the following parts: (i) Core Section, where elemental channels are accommodated(ii) Inlet and Outlet manifolds, (iii) Collecting and Distributing channels, and (iv) Mesh at the inlet manifolds.
The multi block heat exchanger, according to this invention, comprises (i) a core section accommodating elemental channels (ii) inlet and outlet manifolds (iii) collecting and distributing channels and (iv) a mesh at the inlet manifolds, the said manifolds and collecting and distributing channels forming a counterflow between the two streams and also acting as an
insulation providing mermal contact between the two streams, the
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manifolds being extended from the core section to avoid back flow; the mesh also preventing back flow in the core section; and the elemental channels causing the flow to be laminar in the thermal entry region.
This invention will now be described with reference to the accompanying drawing which illustrate by way of example and not by way of limitation one of possible embodiments of the multi block heat exchanger proposed herein
Fig. 1 illustrating the embodiment of the proposed multi block heat exchanger
Fig. 2 illustrating the conventional cross flow heat exchanger
Fig.3 illustrating the manifold extension above the core section of the said embodiment
Fig.4 illustrating the manifolds at the core section Fig. S illustrating the collecting and distributing channels Fig. 6 illustrating the four modules of the embodiment.
In the conventional cross flow heat exchanger there is no heat transfer taking place in the manifolds, collecting and distributing channels. In the heat exchanger proposed herein, the manifolds, collecting and distributing channel. fonn . counter flow between (be two stream, to have transfer as shown in Figs. 3,4 and 5. This counter flow arrangement acts as an insulation and provides maximum thermal contact between the two streams.
The manifolds are extended from the core section to avoid back flow as shown in fig.3. Mesh is also provided in the inlet manifolds, which completely eliminates back flow in the core section.
In the core elemental channels, shown in fig.6, the flow is laminar and
operate in the thermal entiy region. Due to this, high heat transfer coefficients are obtained which improve the systems performance. To accommodate large heat transfer area a modular structure is preferred.
As a result, the effectiveness of the proposed heat exchanger is 2-14% higher than the conventional cross flow heat exchangers. When compared to conventional cross flow heat exchangers its performance is much higher, not achievable by a conventional cross flow heat exchanger.
From the cost point of view, in a conventional cross flow heat
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exchanger in the higher range of effectiveness an increase in effectiveness by 10% will involve increase in the cost by 100 to 200% which in the present case will be only 19%. The proposed heat exchanger with cross flow in the core and counter flow in the manifolds is much superior to the existing cross flow heat exchangers. The proposed heat exchanger can be utilized for applications where space is at premium both for the heating surface as well as header locations.
It will be appreciated from the foregoing that the mufti block heat exchanger proposed herein is not confined to the embodiment herein described and illustrated but that various other embodiments thereof are possible without departing from the scope and ambit of this invention.

We Claim:
1. A multi block heat exchanger comprising (i) a core section accommodating elemental channels (ii) inlet and outlet manifolds (iii) collecting and distributing channels and (iv) a mesh at the inlet manifolds, tiie said manifolds and collecting and distributing channels forming a counterflow between the two streams and also acting as an insulation
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providing . thermal contact between the two streams, the manifolds
being extended from the core section to avoid back flow, the mesh also preventing back flow in the core section; and the elemental channels causing the flow to be laminar in the thermal entry region.
2. A multi block heat exchanger substantially as herein described and illustrated with reference to the accompanying drawings.