modeFRONTIER as a design tool for

compressors suction systems

Tool flexibility evaluation

Talita Wajczyk

Embraco

PRESENTATION TOPICS

• Company Overview (2-3 minutes);

• Problem Description;

• Methodology;

• Goals;

• Conclusion and next steps.

Company overview

OVER

compressors produced

ALGUNS CLIENTES PARCEIROS

Customer

view

Problem description

• Suction System

Inside the

compressor

Compressor

systems

Suction

System

Valve

• Objectives:

– COP and Capacity maximization;

• Parameters evaluated:

– Valve thickness (T_hi);

– Valve profile (rigidez);

– Port diameter (T_bd);

– Length and diameters: tube and chambers;

Problem description

Thickness Profile Port

diameter

Problem description

• Tool flexibity

– Combine diferents codes and applications inside

modeFRONTIER main;

• MATLAB Code:

– Simulates the compression process and valve dynamics;

• Mathcad sheet:

– Evaluates Stiffness and Mass Matrices;

• Visual Basic:

– Encapsulates Mathcad sheet.

Problem description

Optimization

flow

1

2

3

4

5

6

7

• modeFRONTIER main

Problem description

• Set up

Diameter and length:

Tubes and chambers

Problem description

• Set up

Port diameter, valve

profile and valve

thickness

Problem description

• Set up

MATLAB file

Problem description

• Set up

txt file that will be read

by Mathcad sheet

Problem description

• Set up

.exe file responsible to

control the files flow

Problem description

• DOS Batch set up

Stiffness and Mass

matrices evaluation

Problem description

• DOS Batch set up

MATLAB file

execution:

Valve dynamics and

compression process

Problem description

• Set up

DOE:

GA: NSGA-II

Problem description

• Set up

Optimization objectives

Problem description

• Visual Basic

Problem description

Goals

• Matrix correlation:

– Strong correlation

between T_bd and COP

and CAP objectives;

- Negative correlation:

CAP vs T_ht

Goals

• Scatter plot:

– Capacity vs COP;

– Color: Stiffness;

– Size: Port diameter;

– X ΔRange: 35W;

– Y ΔRange: 0.23 W/W;

Port

diameter

Goals

Rigidez T_ht T_bd CAP COP

• Parallel Coordinates:

– Tool for choose points

according variables limits

and goals;

– Excellent when many

solutions are generated.

Conclusion and next steps

• modeFRONTIER is an excellent tool for preliminary project

analysis and optimization;

• Good tool to analyze interactions effects between variables

and objectives;

• It allows with great facility an integration with many kind of

codes and applications, reducing the design time;

• The range obtained for each variable for this problem shows

the benefits of this tool for suction system design.

Talita Wajczyk

Talita_Wajczyk@embraco.com.br

+55 47 3441-2976