Design and implementation of automatic control for a condensation-induced depressurization system

Document Type

Article

Publication Date

10-1-2019

Abstract

This study develops a control system to automate the operation of a condensation-induced depressurization technology, which is used to achieve sub-atmospheric pressure in an open-flow system on ground. The continuous depressurization is maintained via an integrated series of chambers inside which vacuum is regenerated by condensing and refilling of saturated steam. The low pressure generated inside the chambers is then used to alternatively extract the air out of a flow system for maintaining its sub-atmospheric pressure. The thermodynamic cycle in such a vacuum chamber consists of three sub-processes: air purging to ambient by steam refilling, depressurization by steam condensation, and air-extraction from a flow application. As one chamber undergoing these consecutive processes, another chamber operates in a coordinated different phase to seamlessly maintain a continuous air-extraction operation. This new system provides a quiet and efficient way of using low-grade energy to generate hypobaric environment for needed applications. A cascade arrangement of a proposed multiple-chamber operation is also illustrated. A control system is designed and implemented to realize the automatic and coordinated operation in a dual-chamber, laboratory-scaled system. Exemplified results on process characteristics such as chamber depressurization and air purging are also provided.

Identifier

85060528276 (Scopus)

Publication Title

Proceedings of the Institution of Mechanical Engineers Part I Journal of Systems and Control Engineering

External Full Text Location

https://doi.org/10.1177/0959651818816477

e-ISSN

20413041

ISSN

09596518

First Page

1146

Last Page

1158

Issue

9

Volume

233

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