Development of sliding vane expanders for a micro-scale ORC system

Name: Worakit Suankramdee

keyword: Sliding vane expander

; Organic rankine cycle (ORC)

; Waste heat recovery

; Heat engine

Abstract: The Organic Rankine Cycle (ORC) is one of the heat engines which can utilize low−grade heat to produce useful mechanical shaft power. Furthermore, it can be used for producing electricity, or other useful works. The working principle of the ORC is similar to the traditional steam Rankine cycle but there is a difference in the working fluid used. The organic substance is used as the working fluid. Most of the organic substances have a lower boiling point at atmospheric pressure compared to water. Hence, at identical temperature, a higher saturation pressure for the organic substance is made possible. This has high potential to drive the turbine. In the ORC system, the expander is a key role component on the system. Each type of expander has its own characteristic which is suitable for each ORC system capacity. The expanders used for ORC system can be categorized into two types: velocity–type ; and volume–type. The volume–type expander are more practical for the micro–scale ORC system because they are characterized by lower flow rates, higher pressure ratio, and much lower rotational speeds compared with the velocity–type expander. The volume–type expanders can tolerate two–phase flow conditions, which may appear at the end of expansion in some operating condition. The sliding vane expander, which is one of the volume–type expanders, is selected to apply with a micro–scale ORC system. This expander is very attractive in applications where low initial cost and high power density are much more important than efficiency. Even though its efficiency is relatively low compared to the other types, it has relatively simple structure and consists of a comparatively small number of low cost parts. This study focused on the development of sliding vane expanders (2AM and 1AM expanders). They were modified from two commercially available air motor (GAST 2AM and GAST 1AM air motor). The 2AM and 1AM expanders were totally manufactured in–house at the SIIT mechanical engineering laboratory. They were redesigned while keeping the original essential dimensions and operating principles of the original GAST air motors. They were modified so that the units were leak proof and suitable to use as expenders for a micro scale ORC. The sliding vane expander was successfully developed and tested with a micro–scale ORC system. The expander was workable with the system at the various operating conditions. The experimental results show that the expander provided an acceptable performance

Thammasat University. Thammasat University Library

Address: BANGKOK

Email: preserv@tu.ac.th

Name: Satha Aphornratana

Role: advisor

Created: 2016

Modified: 2564-05-19

Issued: 2021-05-18

วิทยานิพนธ์/Thesis

application/pdf

DOI: 10.14457/TU.the.2016.678

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Engineering and Technology

Grantor: Thammasat University

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