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Heat exchanger

Inactive Publication Date: 2013-06-20
ROLLS ROYCE PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a heat exchanger with corrugated plates that have longitudinal main corrugations with parallel ridges and troughs. The ridges and troughs have an undulating profile with a common plane and can be periodic or substantially sinusoidal. The pitch of the undulations is equal to the pitch of the main corrugations in an adjacent plate. The main corrugations of adjacent plates may be angled relative to each other. The depth between adjacent ridges is greater than the depth of the undulations. One or more of the summits may provide a seat portion for abutting a corresponding summit of an adjacent plate. The undulations of adjacent peak ridges and trough ridges in a plate may be in phase relative to the longitudinal axis of the main corrugations. The entirety of each plate may have undulating ridges. At least one of the corrugated plates may include straight ridges. The main corrugations may be asymmetric. The main corrugations may have a saw toothed profile. The main corrugations may be tortuous along the longitudinal axis of the main corrugation.

Problems solved by technology

The complex flow patterns aid the heat transfer between the hot and cold air flows but at a penalty of increasing the pressure loss across the plates or a reduction in velocity and mass flow for a given pressure differential.

Method used

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Embodiment Construction

[0036]Corrugated plate heat exchanger matrices typically have high thermal transfer coefficients and good pneumatic performance. However, conventional corrugated plate matrices have non-uniform heat transfer coefficients across the surface of each corrugated plate, with, for example, a lower heat transfer coefficient in a trough of the corrugations. This non-uniformity in heat transfer results in a non-uniform temperature distribution in the heat exchanger plates and a reduction in performance as a consequence. A typical figure for this reduction in performance can be as high as 7%, which is unnecessarily high. Further, the non-uniformity of heat transfer can lead to local thermal stresses in the heat exchanger matrix which are generally undesirable.

[0037]A further consideration of heat exchangers for aero-engines is the minimum flow cross-section area dimension through the matrix. Typically, it can be necessary for 1 mm diameter particles to be able to pass through an aero engine h...

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Abstract

This invention relates to a heat exchanger, comprising a plurality of stacked corrugated plates, each plate having a plurality of parallel main corrugations each having longitudinal peak ridges and trough ridges, wherein either or both of the peak ridges and trough ridges have an undulating profile so as to define a plurality of summits in a common plane.

Description

TECHNICAL FIELD OF INVENTION[0001]This invention relates to heat exchangers. In particular, the invention relates to cross-corrugated heat exchangers.BACKGROUND OF INVENTION[0002]The use of heat exchangers to transfer the thermal energy from a hot fluid to a cold fluid is well known and finds application in many different industries. One type of heat exchanger having good thermal and pneumatic performance is a cross-corrugated plate heat exchanger 10 as shown in FIG. 1.[0003]The cross corrugated plate heat exchanger 10 shown in FIG. 1 includes a number of corrugated plates 12 which are stacked on top of one another such that the channels formed 14 by the corrugations lie at an angle to one another (90 degrees in this case). The plates are joined together by any suitable application led manufacturing technique such as brazing or welding. The material will also be application led but will typically be aluminium or other metal with a high thermal conductivity.[0004]Although not shown f...

Claims

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Application Information

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IPC IPC(8): F28F3/00
CPCF28F3/046F28F2250/106F28F3/005F28D9/0037
Inventor ROLT, ANDREW MARTINSTIEGER, RORY DOUGLAS
Owner ROLLS ROYCE PLC
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