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Energies 2016, 9(7), 478; doi:10.3390/en9070478

Slide Valves for Single-Screw Expanders Working Under Varied Operating Conditions

1
Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Ministry of Education, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
2
Key Laboratory of Heat Transfer and Energy Conversion of Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
*
Author to whom correspondence should be addressed.
Academic Editor: Roberto Capata
Received: 14 April 2016 / Revised: 8 June 2016 / Accepted: 15 June 2016 / Published: 23 June 2016

Abstract

This paper fully describes the working principle of slide valves in single-screw expanders (SSEs). A geometric analysis of suction and volume ratio slide valves is presented to determine the relations between volume ratio, suction closure volume, discharge opening volume and slide valves displacement. An organic Rankine cycle (ORC) thermodynamic model with SSE integrated with slide valves is developed to analyze the power output of SSE and the net power output of ORC system and variation law of slide valves displacement. Analysis of a typical ORC system under changing operating conditions shows that the power output of the expander and the net output power of the ORC system with slide valves are much better than those without slide valves. When the condensing temperature is 40 °C and the waste availability is 80 kW, the increase in output power and net output power are approximately 3.4 kW and 5 kW, respectively. The presented geometric analysis of slide valves and the thermodynamic model integrated with slide valves can be used to provide a theoretical and technical basis for designing the slide valves of SSEs and the control strategies of slide valves under varied operating conditions. View Full-Text
Keywords: slide valve; single-screw expander; organic Rankine cycle (ORC); part-load slide valve; single-screw expander; organic Rankine cycle (ORC); part-load
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wu, Y.; Zhi, R.; Lei, B.; Wang, W.; Wang, J.; Li, G.; Wang, H.; Ma, C. Slide Valves for Single-Screw Expanders Working Under Varied Operating Conditions. Energies 2016, 9, 478.

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