Analysis of a solar assisted micro-cogeneration ORC system

Facão, Jorge; Palmero-Marrero, Ana I.; Oliveira, Armando C.

doi:10.1093/ijlct/3.4.254

Cited by 25 publications

(7 citation statements)

References 2 publications

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“…Based on the numerical simulations carried out, they reported that the system overall efficiency is directly proportional to the CO 2 flow rate and inversely proportional to the solar collector area. A similar study was conducted by Facao et al [37] examining a 5 kWe solar driven micro-CHP system with an organic Rankine cycle. They reported that the system electrical generation efficiency is directly proportional to the temperature output from the solar collector and can attain 22% at 230°C working fluid temperature.…”

Section: Expander Selectionmentioning

confidence: 80%

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Modelling and testing of a hybrid solar-biomass ORC-based micro-CHP system

Jradi

Riffat

2013

Int. J. Energy Res.

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SUMMARYExpanders employed recently in organic Rankine cycle (ORC)‐based systems suffer from key problems including excessive working fluid leakage, thermal losses, low isentropic efficiency and high cost. The majority of the units available in the market are for medium and large‐scale applications (>100 kW) with no commercial micro‐scale expanders available and applicable for ORC units for residential and building applications. Moreover, the majority of the studies conducted on ORC expanders employed HFC and HCFC working fluids which have high global warming potential leading to negative environmental impacts. In this study, a micro‐scale CHP system based on the ORC technology is theoretically and experimentally investigated to provide the thermal needs and part of the electrical demands for residential applications. An innovative design for a hybrid ORC‐based micro‐CHP system is proposed using a biomass boiler and a solar concentrator to run the CHP system providing more reliable and clean operation compared to conventional natural gas‐driven units. The micro‐CHP system employs a new type small‐scale scroll expander with a compact design, integrating the generator and the turbine in a single unit. A numerical model was developed using the Engineering Equation Solver (EES) software to simulate the thermodynamic behaviour of the ORC unit predicting the thermal and electrical performance of the overall CHP system. In addition, an experimental setup was built to test the whole ORC–CHP system performance under different conditions, and the effect of various operational parameters on the system performance has been presented using an environmentally friendly HFE7100 working fluid. The maximum electric power generated by the expander was in the range of 500 W at a pressure differential of about 4.5 bars. The attained expander isentropic efficiency was over 80% at its peak operating conditions with no fluid leakage observed. Being mass‐produced with low cost in the automotive industry along with the high isentropic efficiency and the leakage‐free performance, the proposed compact scroll expander represents a potential candidate to be used in the development of micro‐scale ORC–CHP units for building applications. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Expander Selectionmentioning

confidence: 80%

“…A similar study was conducted by Facao et al . examining a 5 kWe solar driven micro‐CHP system with an organic Rankine cycle. They reported that the system electrical generation efficiency is directly proportional to the temperature output from the solar collector and can attain 22% at 230°C working fluid temperature.…”

Section: Expander Selectionmentioning

confidence: 99%

Modelling and testing of a hybrid solar-biomass ORC-based micro-CHP system

Jradi

Riffat

2013

Int. J. Energy Res.

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“…Facao et al [54] proposed a thermal analysis of three different solar-driven ORC systems for micro-CHP with a maximum power output of 5 kW. By comparing different climatic conditions leading to a range of operating conditions of the solar thermal collectors between 80 °C and 250 °C, the maximum electricity generation efficiency was 22.2%.…”

Section: Micro-chp Orc-based Systemsmentioning

confidence: 99%

Design, Analysis and Optimization of a Micro-CHP System Based on Organic Rankine Cycle for Ultralow Grade Thermal Energy Recovery

Ziviani¹,

Beyene

Venturini

2013

Journal of Energy Resources Technology

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This paper presents the results of the application of an advanced thermodynamic model developed by the authors for the simulation of Organic Rankine Cycles (ORCs). The model allows ORC simulation both for steady and transient analysis. The expander, selected to be a scroll expander, is modeled in detail by decomposing the behavior of the fluid stream into several steps. The energy source is coupled with the system through a plate heat exchanger (PHE), which is modeled using an iterative sub-heat exchanger modeling approach. The considered ORC system uses solar thermal energy for uitraiow grade thermal energy recovery. The simulation model is used to investigate the influence of ORC characteristic parameters related to the working medium, hot reservoir and component efficiencies for the purpose of optimizing the ORC system efficiency and power output. Moreover, dynamic response of the ORC is also evaluated for two scenarios, i.e. (i) supplying electricity for a typical residential user and (ii) being driven by a hot reservoir. Finally, the simulation model is used to evaluate ORC capability to meet electric, thermal and cooling loads of a single residential building, for typical temperatures ofthe hot water exiting from a solar collector.

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“…The plant design chosen for investigation uses flat plate solar collectors combined with a gas burner, as described by Facao et al (2008). Recent works on small-scale solar cogeneration ORCs using scroll expanders present encouraging estimations of the dynamic performance (Twomey et al, 2013;Ziviani et al, 2014).…”

Section: Introductionmentioning

confidence: 99%