Microturbina e chiller

An energy and exergy analysis of a microturbine CHP system
Basim M.A Makhdoum
School of Mechanical and Systems Engineering
Newcastle University
[e-mail]
Abstract
This paper presents an overview of PhD research work performed to date on modelling and simulating microturbine cycles. Utilising the waste heat energy of microturbine in thermal processes has not been fully exploited in recent studies.
The microturbine is a producer of both high grade energy (work) and low energy
(heat) that can be recovered for a useful purpose. The following low grade heat energy powered systems have been modelled under ISO ambient conditions
(international standard organisation), i.e. 15ºC and 1 bar, to utilise the waste heat energy of a 200kW microturbine combined with a single effect absorption chiller, an organic ranking cycle using R245fa (ORC-R245fa) as a working fluid, a multi-effect distillation desalination (MED) and or a thermal vapour compression
MED Desalination unit (TVC-MED). The thermal comparison was carried out based on an energy and exergy analysis in terms of electric efficiency, exergetic efficiency, carbon footprint, and energy utilisation factor (EUF). The software package called IPSEpro, has been used to model and simulate the proposed power plants. As a result, utilising the exhaust waste heat energy in single-effect absorption chillier has contributed to stabilise ambient temperature fluctuation, and gain the best exergetic efficiency of 39%, while the EUF has reached 72% and the carbon foot print was reduced by 75% in MED and TVC-MED
Desalination respectively.
The results also reveal that TVC-MED is more efficient than traditional MED as its gain output ratio (GOR) is improved by 5.5%. In addition, ORC-245fa generates an additional 20% of the microturbine electricity generation.
1. Introduction
Microturbines are small components of modern electricity generators that burn gaseous and liquid fuels, creating high-speed