Modelling and off-design performance optimisation of a trilateral flash cycle system using two-phase twin-screw expanders with variable built-in volume ratio

被引：29

作者：

Bianchi, Giuseppe ^{[1
]}

Marchionni, Matteo ^{[1
]}

Miller, Jeremy ^{[2
]}

Tassou, Savvas A. ^{[1
]}

机构：

[1] Brunel Univ London, Ctr Sustainable Energy Use Food Chains, Inst Energy Futures, Uxbridge UB8 3PH, Middx, England

[2] Spirax Sarco Engn PLC, Cheltenham GL51 9NQ, Glos, England

来源：

APPLIED THERMAL ENGINEERING | 2020年 / 179卷

基金：

欧盟地平线“2020”; 英国工程与自然科学研究理事会; “创新英国”项目;

关键词：

Trilateral flash cycle; Twin-screw expander; Two-phase expander; Low-grade waste heat recovery; Built-in volume ratio; ORGANIC RANKINE-CYCLE; WASTE HEAT; SIMPLEX-METHOD; POWER; RECOVERY;

D O I：

10.1016/j.applthermaleng.2020.115671

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

This research work presents a numerical chamber model of a two-phase twin-screw expander and its further integration in a one-dimensional model of a Trilateral Flash Cycle (TFC) system for low-grade heat to power conversion applications. The novel feature of the expander is the capability of changing the built-in volume ratio (BIVR) of the machine through a sliding valve in the casing that opens an additional suction port. Lowering the BIVR from 5.06 to 2.63 results in an improvement of the volumetric efficiency from 53% to 77% but also in a reduction of the specific indicated power from 4.77 kJ/kg to 3.56 kJ/kg. Parametric analysis on several degrees of freedom of the full TFC system concluded that expander speed and BIVR are the variables that mostly impact the net power output of the unit. An optimisation study enabled the net power output of the TFC system, at design point, to increase from 81 kW to 103 kW.

引用

页数：12

共 40 条

[1] Experimental study of converging-diverging nozzle to generate power by Trilateral Flash Cycle (TFC) [J].