Structure and Structural Structure and Structural calculation calculation

forfor

Recuperative Heat Recuperative Heat ExchangerExchanger

Presented by --Jinying Zhu

Material: stainless steel 304Material: stainless steel 304

Mechanical properties

Allowable stress (MPa) : 206.84

Modulus of Elasticity (GPa) : 193.05

Poisson’s Ratio : 0.305

Structure parameters: Structure parameters:

• Passage number: 200*200• Δp: 27atm• The size of passages: 200μm*200μm

thic

knes

s

passage: 200um*200um

Red: hot flow

blue: cold flow

Structure:Structure:

• main heat exchange part

• connector

(the next four pictures supplied by Ray)

Structural calculation result: Structural calculation result:

(for main heat exchange part)(for main heat exchange part)

Thickness(μm) max. stress (MPa) max. displacement(μm)

300 7.58 3.13*10-3

400 6.95 2.96*10-3

500 6.92 2.94*10-3

600 6.28 2.91*10-3

:by using the software Ideas 9

Strength in the main heat exchanger part is not a problem.

Connector:Connector:

Material Mechanics:

W (N/m)

L

b

h

Connector:Connector:

Material Mechanics:

M =wL2/12

I =bh3/12

σ =Mc/I=PL2/(2h2)

We need to add some support in the connector for L has a large value comparing to h.

Connector supporting structure:Connector supporting structure:

L1

High press. flow

Low press. flow

thickness

thickness

Structural calculation result:Structural calculation result:

(for connector)(for connector)

Thickness(μm) max. stress (MPa) max. displacement(μm)

300 190 2.80

400 179 2.50

500 170 2.41

600 162 2.38

:by using the software Ideas 9

The strength of connector is our focus in structural consideration.

Future work:Future work:

• Thermal-calculation

• Optimization of structure (thickness, stress and displacement)